M.R.M. Aliha

M.R.M. Aliha
Iran University of Science and Technology

PhD

About

175
Publications
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7,655
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Publications

Publications (175)
Article
Till now, only very limited test results have been reported for mode II fracture toughness (KIIc) of asphalt mixtures. In the absence of any standard testing method for determining KIIc value for these materials, in this research, an experimental program is done to measure and investigate this parameter at low‐temperature using four different test...
Article
Full-text available
In the present work, a new and novel test specimen is presented to solve the difficulties and problems of traditional adhesive fracturing test specimens. The specimen is a bi-material adhesive joint in the shape of a rectangular beam and containing a vertical crack in the adhesive layer. If the specimen is loaded by a three-point bend setup with sy...
Article
This study investigates the effects of tool traverse and rotational speeds in the friction stir back extrusion (FSBE) process on the microstructural and mechanical properties of brass wires produced. The microstructural properties were examined by microscopic tests and the mechanical properties of the wires by hardness and pressure tests. The mater...
Article
Asphalt fracture due to initiation and propagation of cracks is a major failure mode especially at cold regions. Freezing and thawing phenomenon that is often seen at rainy environments can double the damage of overlays and pavement systems. Study of the crack resistance of asphalt concrete materials exposed to such environmental condition can prov...
Article
Manufacturing polymer concrete (PC) with suitable performance against cracking is an important issue for using these composite materials in practical applications. Fracture toughness and fracture energy of such randomly distributed aggregates inside the matrix of polymeric resin is affected by the mix design and percentages of PC ingredients. In th...
Article
Aging can affect the fracture behavior of bitumen-containing composites due to an increase in the total stiffness of the material. In this study, the effect of aging on the behavior of Cement Emulsified Asphalt Mortar (CEAM) under the mixed-mode I/III fractures was investigated at an intermediate temperature, and its fracture behavior was modeled w...
Article
Suitable resistance against fracture and cracking is a primary requirement for using polymeric concrete materials in practical applications. The main aim of this research is to investigate the effect of mix-design on mode I cracking behavior. A total number of 72 different Polymer Concrete (PC) mix-designs made of four ingredients (epoxy resin, coa...
Article
Soil is a common material for constructing the sub-grade layer in multi-layer pavement systems, buried pipelines and embankment dams. Failure and fracture of this material may result in undesired deformation and bad effect on the long-term performance of such structures. So far a number of testing methods and data are available for tensile type fra...
Article
The effect of some important testing conditions including test specimen (SCB and ENDB), fracture mode (I and II), loading rate (0.5, 1.0, and 5.0 mm/min), and temperature (−5°C, −15°C, and −25°C) is evaluated on fracture toughness of asphalt material containing different percentages of fibers (0%, 0.025%, 0.05%, and 0.1% of unit weight). The experi...
Article
Asphalt mixtures in the laboratory scale studies are often compacted and manufactured using two well-known methods namely gyratory and marshal methods. Due to differences in compaction procedure, employing any of these methods can affect the overall strength and mechanical properties (such as the fracture toughness and cracking resistance) of hot m...
Article
In the practical implementation of the Additively Manufactured (AM) construction in engineering designs, Fused Deposition Modeling (FDM) is recently used to manufacture the inexpensive Acrylonitrile Butadiene Styrene (ABS) parts. The cracking behaviors of such layered components are inspected using the Semi-Circular Bending (SCB) fracture samples....
Article
Full-text available
In this study, a new test configuration was used to investigate the full range of mixed-mode I/II fracture behavior of asphalt mixtures using a Short Beam Bending (SBB) specimen with a vertical edge crack, which was subjected to an asymmetric three-point bending load. To evaluate the capabilities and assess the characteristics of this new specimen,...
Article
As a visco-elastic material, asphalt binder acts as a brittle material under sub-zero temperature. The brittleness of this material at low-temperature conditions may result in sudden failure of asphalt pavements by passing the traffic loads. Utilizing the edge notched short bend beam (ENSBB) specimen, critical modes I and II stress intensity factor...
Article
Rigid foam materials are among the low strength structural components that can be failed catastrophically under mechanical loads. Low fracture toughness is therefore a major failure mode in these materials and researchers try to find suitable testing methods for determining the fracture toughness of foam materials. In this research a suitable test...
Article
Polymer concrete is a relatively new concrete in which a matrix made of a polymeric resin material is used to bind the ingredients. In this paper, 288 specimens made of 72 different plain and fiber-reinforced polymer concrete mixtures (PC and FRPC) are prepared and tested to assess the fracture behavior under pure mode I and pure mode II conditions...
Article
Using short beam specimen containing an edge crack (perpendicular to the beam axis) and subjected to asymmetric three-point bend loading a new test configuration (called ASBB) was suggested for investigating the mixed mode I/II fracture. Despite the conventional beam specimen with high aspect ratio of length to width that is not able to produce mod...
Article
Due to the difficulties of applying torsional loads to introduce mode III effects, there are few studies for investigating mixed mode I/III fracture in brittle materials. In this paper using three novel single or double edge-cracked diametral compression disc shape specimens, complete ranges of mixed mode I/III are introduced. Fracture factors of t...
Article
Full-text available
The need to rely on knowledge-based economics and the strong link between research centers, universities, and industries are not hidden from anyone today. Research centers and universities in Iran are mainly the origins of the development of a wide range of advanced technologies But unfortunately, these technologies are rarely commercialized. On th...
Article
This paper discusses the effects of mixed mode loading on cohesive zone parameters obtained from load-crack mouth opening displacement (CMOD) curves in asphalt mixtures at intermediate temperature. To this end, a coupled viscoelastic numerical-experimental approach has been used to capture the cohesive strength and fracture energy in the fracture p...
Article
This paper aims to evaluate the influence of two recycling agents (RAs) on the cracking behavior of warm mix asphalt (WMA) containing up to 50% reclaimed asphalt pavement (RAP). Two chemically different types of recycling agents, namely aromatic extracts and triglycerides/fatty acids, together with a WMA additive (Sasobit®) were introduced to the m...
Article
This paper investigates the effect of loading rate on the mixed-mode I/II fracture behavior of PolymethylMethacrylate (PMMA). Experimental studies are performed using a novel fracture test specimen which has recently been developed, called short bend beam (SBB), in different loading rates of 1mm/min, 20 mm/min, and 200 mm/min. Fracture test data ar...
Article
The effects of recycled crumb rubber up to 25% replacement of fine and coarse aggregates in two discreet gradations combined with 0% to 25% substitution of cement by silica fume were studied on the mechanical and fracture properties of self-compacting concrete (SCC). For acquiring a diverse means of comparison, toughness index and energy absorbency...
Article
Full-text available
Until now, some test specimens with different shapes and loading mechanisms have been utilized for investigating the cracking behavior of adhesive bounded joints. In this research, using a novel test configuration called adhesive short bend beam specimen containing an inclined crack and loaded by three-point bending, mixed mode I/II fracture parame...
Article
In this study, recycled polyethylene terephthalate (PET) bottles are shredded in different sizes and added to the polymer concrete composition to investigate the effect on the fracture toughness and fracture energy as well as an idea to reduce the environmental pollution. In order to measure the mode I fracture toughness, center cracked Brazilian d...
Article
Full-text available
As an inherent characteristic of materials, the fracture toughness is an important parameter to study the cracking behavior of asphalt concrete mixtures. Although material compositions and environmental conditions have a significant effect on the fracture toughness, for a certain material and testing environment, the test condition including the sp...
Article
Full-text available
Asphalt mixture is a type of textured composite material made of aggregates and mastic part. Overall strength and failure behavior in such materials depends on the texture or heterogeneity of the mixture. In particular, the crack growth mechanism from the tip of the pre-crack is significantly affected by the texture of the asphalt composite and env...
Article
Determination of fracture toughness (KIc) for the asphalt mixture concrete requires employment of suitable testing methods and specimens. Disc-shape specimens are among the favorite test geometries for conducting the fracture toughness experiments on asphalt concrete materials since they can be manufactured easily from those samples obtained by the...
Article
The main objective of this manuscript is to evaluate the capability of the fracture criteria and numerical methods to predict fracture properties of the specimens fabricated using the Fused Deposition Modelling (FDM) 3D-Printing method. Five different thermoplastic materials are 3D printed in Semi-Circular Bending (SCB) specimens configuration and...
Article
Full-text available
The aerated autoclaved concrete [AAC] is a widely used material in civil engineering for constructing masonry elements. It has excellent insulation and strength properties. The soft porous building materials during exploitation of engineering structures are subjected to various types of loading. The stress state in masonry elements are generated by...
Article
A part of the multilayer pavement structure containing top‐down crack in the hot mix asphalt (HMA) layer and subjected to loading of a moving vehicle is simulated using the finite element method. Aggregate distribution and packing algorithm was used for modeling the HMA layer around the top‐down crack as a heterogeneous two‐phase (aggregate/fine ag...
Article
A novel test method is proposed in this research for determining the tensile strength of rocks and geo-materials. Using a seesaw device, two diametral tensile forces are applied to the inner surface of a ring shape specimen and consequently, the ring specimen is split along a plane normal to the direction of applied tensile loading. A suitable form...
Article
In recent years, there has been an increasing interest in 3D printing technology. Fused deposition modeling (FDM) is the most popular 3D printing technology on the market. Selecting the best possible level for process parameters is one of the greatest challenges. Therefore, this research work aims to provide insights on the influence of process par...
Article
Pure mode I and mode II fracture toughness of asphalt mixture was investigated both experimentally and theoretically using vertical edge crack semicircular bend (SCB) specimen with symmetric and asymmetric bottom loading spans. The thickness of SCB specimen was considered in the range from 30 to 70 mm, and the fracture toughness tests were performe...
Article
The overall characteristics and fracture behavior of asphalt pavements and overlays is significantly controlled by the mechanical behavior of bitumen used in the mixture of asphalt concrete. The bitumen behaves like a dominantly brittle and elastic medium under subzero temperatures. In practice, cracked asphalt pavements experience mixed mode tensi...
Article
Having asphalt in Cement Emulsified Asphalt Mortar (CEAM), this composition has higher toughness and ductility but also higher thermal sensitivity than conventional cement mortar. This study was aimed at investigating the fracture behavior of CEAM under out-of-plane shear and tensile loadings (Mode I, I/III, III) at low temperature. This investigat...
Article
Towards measuring the mixed-mode I+III fracture toughness independent of geometry and loading type, two test specimens were numerically and experimentally compared. The capabilities of edge-notched disc bend (ENDB) and edge-notched diametrically compressed disc (ENDC) fracture test specimens were compared in producing the full range of mixed-mode I...
Article
Mode I fracture resistance of two asphalt mixtures (control and modified with low‐density polyethylene [LDPE] as binder additive) was studied experimentally and theoretically. The fracture toughness experiments were conducted on edge notch disc bend, edge notch disc compression and semi‐circular bend configurations under two loading rates and two l...
Article
In this study, the cracking growth behavior of heterogeneous asphalt mixture was investigated numerically. To reach this goal, at first, a numerical asphalt mixture sample was created using the random aggregate generation and packing algorithm. Then using extensive two-dimensional finite element analyses, the effects of crack length, elastic modulu...
Article
Cracked pavements can be subjected to out-of-plane sliding or mode III deformation due to movement of vehicles. In order to design suitable asphalt mixture for manufacturing high resistance pavements against mode III failure, it is necessary to determine a characteristic parameter called mode III fracture toughness (K IIIc) for these materials. In...
Article
In cold regions, asphalt concrete cracking caused by low temperature is known as the most important type of damage to asphaltic surfaces pavements. In rainy areas, the cold may cause asphalt freezing and due to this reason, the asphalt damages would be doubled. In recent years, thermal cracking characteristics of asphalt concrete have been investig...
Article
The fracture features of the 3D-printed samples are assessed employing Semi-Circular Bending (SCB) specimens. The critical failure loads are experimentally measured and have been predicted using both Maximum Tangential Stress (MTS) and Generalized Maximum Tangential Stress (GMTS) criteria. The 3D-printing process is improved with several approaches...
Article
Butt welding of AA6063 aluminium cylindrical shells was performed using the orbital friction stir welding (FSW) method. Tool rotation speed and orbital speed (i.e., traverse speed of rotating cylinder during welding) were considered as variable, and the strength and the mechanical properties including tensile strength, microhardness, mode I fractur...
Article
A number of specimen configuration and testing method have been developed till now for determining the fracture toughness of asphalt concrete. The Edge Notch Disc Bend (ENDB) specimen is among the suitable test specimens in this regard due to its some primary advantages such as simple geometry and testing procedure and also covering different combi...
Article
A new test specimen for mixed-mode I+II fracture studies is proposed. An extended version of edge notch disc bend (ENDB) specimen, which was recently proposed to assess mixed-mode I+III fracture toughness, is designed and developed for introducing opening-in-plane-shear sliding mode. This new specimen that is called asymmetric ENDB specimen (A-ENDB...
Article
Escalating the price of asphalt binder and environmental issues have led to an increasing desire to use high amounts of reclaimed asphalt pavement (RAP) material in asphalt mixtures. However, increasing the RAP content may have negative effects on some characteristics of asphalt mixtures, such as cracking resistance. Therefore, finding an approach...
Article
The cracking behavior of asphalt mixtures in the shape of angled edge crack semi-circular bend (SCB) specimens created by the generation and packing algorithm was investigated numerically. Using extensive two-dimensional finite element analyses, the effects of crack length and crack inclination angle, elastic modulus of aggregates and mastic parts,...
Article
Edge cracked semi‐circular shape specimen subjected to three point bend loading is a favourite test specimen for determining fracture toughness of asphalt mixtures. However, in the vast majority of previous experimental works, the homogeneous medium assumption has been considered for determining the stress intensity factor and geometry factors of a...
Article
In this paper an angled edge cracked short beam specimen subjected to symmetric three-point bend loading was designed and examined for conducting mixed-mode I + II fracture toughness experiments. This specimen is suitable for being used in those experimental crack growth studies in which a very limited amount of raw material is available for the pr...
Article
Semi-circular bend (SCB) specimen is one of the test specimens for determining the fracture toughness of brittle and quasi brittle materials such as rocks. Two types of initial notch geometries can be introduced in this specimen: straight notch and chevron notch. To determine the fracture toughness of materials by means of these two SCB configurati...
Article
Environmental issues and high prices of bitumen justify the use of reclaimed asphalt pavement (RAP) as a raw material in asphalt production. However, the high stiffness of the aged bitumen in RAP material often causes different problems such as lower workability and lower fatigue and cracking resistance which can be solved by using recycling agents...
Article
Since many parameters are involved in the concrete mix design, finding the optimal mixing design has always been a problem for concrete engineers. In this research, the Taguchi optimization method is improved to model to optimum mix design of the high strength self-consolidating concrete (HSSCC). For this purpose, at first different quality criteri...
Article
In this paper an inclined edge cracked short beam specimen subjected to symmetric three-point bend loading was designed and examined for conducting mixed-mode I/II fracture toughness experiments. The aspect ratio (i.e. length to width ratio) and the loading span distance are considered much lower than the other conventional cracked bend beam sample...
Article
A modified single edge cracked bend beam specimen called "inclined edge crack asymmetric bend" (IE-CAB) specimen was designed and proposed for investigating mixed mode I/II fracture toughness behavior of brittle materials. Using a large number of finite element analyses performed for different geometry and loading conditions, it was demonstrated th...
Article
Full-text available
Crack growth and brittle fracture is one of the major failure modes in bone materials and therefore understanding the fracture behavior and affecting parameters on the crack growth resistance of bone is necessary for biomechanics researchers. In this paper, mode I fracture toughness value for the left and right femur bones of same bovine were measu...
Article
Aluminum and copper, two highly desired material, are the most consumed minerals in different industries after iron and two most important materials in today’s industrial world. Copper for its beneficial properties like thermal and electrical conductivity and resistance to corrosion and aluminum for its low weight along with high strength are used...
Article
In this paper, an inventory model for deterioration items in a two-echelon supply chain including one retailer and one manufacturer is proposed by considering the stock and price dependent demand and capacity constraint for holding inventories. First, the model is presented as a leader-follower game in which the manufacturer announces wholesale pri...
Article
During the two past decades, a large number of papers have been published for investigating mechanical properties and microstructure of Friction Stir Weld (FSW) joints made of several similar and dissimilar alloys. Crack growth resistance of such joints is an important design parameter for integrity and life assessment of FSW components. In practic...
Article
Fracture load prediction for brittle cracked components under mixed mode tensile-shear loading is an essential task for integrity assessments and reliability analysis of structures containing flaws or cracks. Most of the available fracture criteria are usually derived based on the crack tip stress /strain fields that consider a limited terms of Wil...
Article
Cracking is one of the major deterioration mechanisms of asphalt pavements at low temperatures. Over the last decades, fracture mechanics has been used as a tool to investigate this phenomenon. For this purpose, two related measures namely, fracture toughness and to some extent, fracture energy are used to investigate the performance of asphalt mix...
Article
Full-text available
The applicability of a recently proposed test specimen named the edge notched diametrically compressed (ENDC) disc was assessed for mixed mode I/III fracture toughness studies. The specimen benefits from simple geometry and does not require complicated test configuration. The finite element analyses of this specimen revealed that pure modes I and I...
Article
Crack growth behaviour of aged and unaged 30/40 asphalt binder at subzero temperature was studied both experimentally and theoretically using a test sample called inclined notched bend beam specimen. A series of fracture tests were conducted on this specimen at two subzero temperatures and different combinations of modes I and II. The fracture toug...
Article
In this paper, fatigue life, crack growth trajectory, and stress intensity factors of top‐down and bottom‐up cracks have been investigated in a multilayered asphalt pavement using numerical method. Finite element models, Paris law, and maximum tangential stress criteria were used to determine the effects of vehicle position, thickness, and stiffnes...
Conference Paper
Full-text available
Determining the fracture toughness of rock materials that expresses the resistance of rock against the crack growth always has been important for mine engineering in the major mining projects. In numerous studies, specimens with different sizes and geometries have been used to obtain the rock fracture toughness. It is expected that, the value of th...
Article
The low quality of work packages is one of the reasons for the failure of projects and leads to losses such as increasing the costs, projects’ delay and even bankruptcy of the projects’ contractors. One strategy for avoiding these losses is the investment in the quality of projects. In this paper, we model the dynamic nature of the investment in th...
Article
Full-text available
One of the most important challenges of storing fluids in thin walled pressure vessels under internal pressure is preventing crack propagation. At low temperatures, steel shows brittle crack propagation characteristic, which is highly dangerous. In this paper, a new numerical model is presented, in order to investigate the reinforcement of a cracke...
Article
This paper investigates the mode I (i.e. tensile) and mode III (i.e. tearing) fracture behavior of concrete composites containing synthetic forta-ferro (SFF) fibers. By employing a simple and suitable test specimen called edge notched disc bend (ENDB) specimen, the effect of adding different percentages of SFF additive on fracture load, fracture to...
Article
Mode II or in-plane sliding of crack faces is one of the possible fracture modes for asphalt pavements which can often take place due to traffic loads passing over the crack at low temperature conditions. Hence pavement engineers need to know the value of mode II fracture toughness (KIIc) of asphalt mixtures as an important design parameter. Howeve...
Article
Crack growth in asphalt concretes or bitumen is a major failure mode at low temperature conditions. However, the vast majority of fracture toughness studies for such materials have been mainly performed on asphalt mixtures and the crack growth analysis and fracture behavior of pure and neat bitumen has rarely been studied in the past. Therefore, in...
Article
In the present paper, the fracture behaviour of fibre-reinforced roller-compacted concrete (RCC) specimens are examined, with mono and hybrid fibre (different type and length). The modified two-parameter model (MTPM) was employed to calculate Mode I plain-strain fracture toughness which is able to take into account the possible crack deflection (ki...
Article
Friction Stir Welding (FSW) is a solid-state process, where the objects are joined together without reaching their melting point. It has been shown that this method is a suitable way to join dissimilar aluminium alloys. The current article employed hole drilling technique to measure the residual stress distribution experimentally in different zones...
Conference Paper
Mixed mode I/III (i.e. tensile-tear) fracture is one of the possible failure modes in engineering components and structures subjected to out-of plane loads and deformations. Under such loading conditions fracture direction is twisted from the initial crack plane. Study of fracture initiation direction and propagation path under mixed mode I/III is...
Article
The usage of waste materials in industrial application is one of the main issues around the world. The reclaimed asphalt pavement is one of the waste materials that due to environmental and economical benefits is usually used in road construction. This research study investigates the fracture toughness of concrete mixtures containing different perc...
Article
Full-text available
In laboratory fracture toughness studies, the crack growth resistance of rock materials may be influenced by different factors such as specimen geometry, loading conditions, and also the type of pre-notch cut in the test sample. In this paper, a large number of mode I fracture toughness experiments are conducted on an Iranian white rock “Harsin mar...
Article
Foam materials can be subjected to tensile and out-of-plane sliding deformation during their service life. Hence, catastrophic brittle fractures initiated from the pre-existing cracks under combined influence of modes I and III is one of the possible failure mechanism in rigid foams. However, at the best knowledge of authors there are no mixed mode...
Article
Full-text available
In this research, fracture of dissimilar friction stir welded (FSWed) joint made of Al 7075‐T6 and Al 6061‐T6 aluminum alloys is investigated in the cracked semi‐circular bend (CSCB) specimen under mixed mode I/II loading. Due to the elastic‐plastic behavior of the welded material and the existence of significant plastic deformations around the cra...
Article
One of the major issues of hot mix asphalt (HMA) concretes in moderate service temperatures is cracking, which may result in asphalt failure. Although several studies conducted have focused on the cracking of HMA, there are only few studies that focused on the viscoelasticity of this mixture. This paper investigated the effect of viscoelastic aspha...
Article
Full-text available
At intermediate service temperatures hot mix asphalt (HMA) concretely are subjected to different loading rates due to movement of vehicles which can significantly affect their mechanical characteristics and final service load. Hence, in this paper the effect of loading rate on intermediate temperature fracture resistance of HMA materials is investi...