Mohammad Azadi

• PhD in Mechanical Engineering
• Engine Project Manager at Bahman Group

In this article, a novel energy-based lifetime prediction model has been presented for uncoated and coated aluminum alloys, subjected to thermal and mechanical fatigue loadings. For this objective, isothermal and thermo-mechanical fatigue tests were performed on the A356.0 alloy, with and without thermal barrier coating systems. This model, which w...

In the present paper, an improvement in high temperature fatigue properties of the AZ91 magnesium alloy with rare earth elements has been obtained by a typical heat treatment, denoted by T6. For this objective, out-of-phase thermo-mechanical fatigue, room temperature and high temperature low cycle fatigue tests are performed to compare lifetimes. S...

In the present paper, thermo-mechanical fatigue (TMF) and low cycle fatigue (LCF) or isothermal fatigue (IF) lifetimes of a cast magnesium alloy (the AZ91 alloy) were studied. In addition to a heat treatment process (T6), several rare elements were added to the alloy to improve the material strength in the first step. Then, the cyclic behavior of t...

In this paper, a new fatigue lifetime prediction model is presented for the aluminium–silicon–magnesium alloy, A356.0. This model is based on the plastic strain energy density per cycle including two correction factors in order to consider the effect of the mean stress and the maximum temperature. The thermal term considers creep and oxidation dama...

In the present paper, the heat treatment effect on A356.0, a cast aluminum alloy which has been widely used in diesel engine cylinder heads, is investigated under out-of-phase thermo-mechanical fatigue and low cycle fatigue (at different temperatures) loadings. A typical heat treatment is applied to the material including 8 h solution at 535 °C, wa...

The current analysis studied the analyzing method and experimental datasets of the plain and fretting fatigue lifetime of 16MnCr5 steels and the impact of duplex plasma nitriding and diamond-like carbon (DLC) coatings. Standard specimens were cut from industrial piston pins used in combustion engines and machined for this objective. Subsequently, p...

Accurately predicting the fatigue behavior of spot welds remains challenging due to varying material properties across weld zones. This study investigates the fatigue behavior of spot welds in DC04 steel through experimental testing and finite element modeling (FEM). Four modeling approaches—Solid Element (SE), MPC Beam Element (MBE), Quad RBE3, an...

In this research, the effects of clay nano-particles addition and heat treatment on the elastic strain, mean stress, and stress amplitude of piston aluminum-silicon alloys were investigated. For such a purpose, strain-controlled low-cycle fatigue (LCF) tests were performed at 25, 200, 250, and 300 °C with the total strain amplitudes of 0.20%, 0.25%...

Today, there are many methods for treating coronary artery blockage. Doctors determine the type of treatment according to many parameters, such as the patient's age and the degree of arterial blockage. A method of arteriosclerosis treatment is stenting. The body's activity in different conditions causes different thermal heat fluxes on the artery....

With the growing need for sustainable transportation solutions, understanding the relationship between driving characteristic parameters, vehicle type, and their impact on emissions and fuel consumption over real driving scenarios is becoming increasingly important. In this paper, four conventional vehicles and one hybrid vehicle with different tec...

In the present study, the impact of geometric variables and structural features of stents on hemodynamic parameters is investigated. Intravascular stent implantation is a treatment method whose success largely depends on the geometric structure of the stent and its effect on hemodynamic parameters. Medical devices called stents are inserted into ar...

Polylactic acid (PLA) has become desirable for biomedical applications, particularly implantable devices. However, the degradation of PLA in biological environments under mechanical stress remains incompletely understood and requires further investigation. This study compared the plain fatigue (PF) and the biodegraded fatigue (BDF) behavior of 3D-p...

Highlights • Collecting data from routes on working days and holidays during peak hours in Shiraz City. • Utilize the Analytic Hierarchy Process (AHP) for selecting test routes. • Using K-means clustering and PCA algorithms to design real driving cycles. • Considering 12 characteristic parameters in generating each drive cycle. • Deriving HC, C...

It is critical to evaluate the estimation of the fatigue lifetimes for the piston aluminum alloys, particularly in the automotive industry. This paper investigates the effect of different normalization methods on the performance of the fatigue lifetime estimation using Extreme Gradient Boosting (XGBoost), as a supervised machine learning method. Fo...

PLA (Poly-lactic acid)-wood provides more biodegradability through natural fibers, a significant advantage of pure PLA. Nevertheless, these bio-composites may have inferior mechanical properties compared to non-degradable polymer composites, considering the lower strength of natural particles compared to synthetic fibers. This research examines the...

The estimation of transition fatigue lifetimes for piston aluminum alloys was carried out using unsupervised machine learning (ML) with the K-means algorithm. For this purpose, an experimental dataset representing standard ISO specimens with piston aluminum alloy material, which was subjected to rotational bending fatigue tests under fully reversed...

A study was conducted to compare the pure fatigue and fretting fatigue properties of AM60 magnesium alloys, with and without 3D-printed PLA coatings. The PLA coating layers led to an increase in the fatigue lifetime in both pure and fretting conditions. They delayed the crack initiation time compared to uncoated samples, thereby increasing fatigue...

Various input variables, including corrosion time, fretting force, stress, lubrication, heat-treating, and nano-particles, were evaluated by modeling of stress-controlled fatigue lifetimes in AlSi12CuNiMg aluminum alloy of the engine pistons with different machine learning (ML) techniques. Bending fatigue experiments were conducted through cyclic l...

In this research, hysteresis loops of the aluminum alloy beside a nano-composite with a heat treatment were compared under thermo-mechanical fatigue loadings. For this objective, 1 wt% of clay nano-particles were used in order to fabricate the nano-composites using gravity and also stir casting methods. Nano-composites were T6-heat-treated under th...

In this research, the pure fatigue behaviors of AM60 magnesium alloy with polylactic acid (PLA) coating (PF-AM60-PLA) and the corrosion fatigue behaviors of magnesium alloy with PLA coating (CF-AM60-PLA) were evaluated. Polymer coating was made by fused deposition modeling (FDM) with a 3D printer and attached to standard fatigue test specimens with...

3D printing has become a crucial additive manufacturing technique with the applications in various industries. Fused deposition modeling (FDM) is a common additive manufacturing process that offers considerable flexibility in the component fabrication through multiple parameters, which strongly influence the properties of the produced parts. This s...

In the previous work, the pure fatigue behavior of AM60 magnesium alloy (PF-AM60) was compared with the corrosion fatigue behavior of these specimens (CF-AM60). In this research, in continuation of the previous job, the pure fatigue behaviors of AM60 with polylactic acid (PLA) coating (PF-AM60-PLA) and also, corrosion fatigue behaviors of magnesium...

The challenge of 3D-printed polymer coating performance on metallic substrates is using a proper adhesive layer. Thus, the effect of various adhesive layers on the electrochemical properties of polylactic acid (PLA) as bio-coatings was performed in this study. These coatings were fabricated through a fused deposition modeling 3D printer on AM60 mag...

In this present work, the pure fatigue (PF) behaviors of AM60 magnesium alloys were investigated for the as-received samples, compared to the pre-corroded specimens in simulated body fluid (SBF). The standard fatigue testing specimens were held for 28 days in the SBF, so-called corrosion fatigue (CF) samples, while their weights were recorded. Afte...

One of the applications of mechanical metamaterials is in car tires, as a non-pneumatic tire (NPT). Therefore, to find a suitable cell to replace the pneumatic part of the tire, three different solution methods were used, including topology optimization of the cubic unit cell, cylindrical unit cell, and fatigue testing cylindrical sample (FTCS). Fi...

In the proposed paper, the estimation of transition fatigue lifetimes for piston aluminum alloys was carried out using unsupervised machine learning (ML) with the K-means algorithm. For this purpose, an experimental dataset representing standard ISO specimens with piston aluminum alloy material, which was subjected to rotational bending fatigue tes...

Infill parameters are significant with regard to the overall cost and saving material while printing a 3D model. When it comes to printing time, we can decrease the printing time by altering the infill, which also reduces the total process extent. Choosing the right filling parameters affects the strength of the printed model. In this research, the...

This study introduces and compares computational fluid dynamics of Newtonian and non‐Newtonian blood flows in coronary arteries, with and without considering stents. Three blood flow models, including Newtonian, Carreau, and non‐Newtonian power‐law models, were simulated to investigate their effect, and the solution algorithm includes drawing the g...

In the present article, different inputs including the fretting force, the corrosion time, the lubrication, heat-treating, nano-particles, and the stress were considered in various machine learning-based modeling in the fatigue lifetime of the piston AlSi12CuNiMg aluminum alloys. For this objective, bending fatigue testing was performed on standard...

In the present research, the fracture behavior of the AZ91 magnesium alloy is analyzed based on the striations spacing on the fracture surface for predicting the fatigue High-Cycle Fatigue lifetime. At first, equations and relations were extracted based on the Paris law. Then, striations spacing was measured using ImageJ software and field emission...

In this article, the effect of nano-clay particles and heat-treating on thermo-mechanical fatigue (TMF) behaviors and failures of piston aluminum-silicon (AlSi) alloys was investigated. For this purpose, thermo-mechanical fatigue tests were conducted under out-of-phase (OP) loading conditions. Two loading conditions were checked based on different...

Raw driving data were proposed in this data article in Semnan city, with the objective of considering traffic conditions (morning, noon, evening, and night). For this job, two passenger cars were used and the data of the car speed, longitude, latitude, and altitude of vehicles were acquired. These cars were the Toyota Prius and the Peugeot Pars (or...

In non-pneumatic tires, metamaterial cells could replace the pneumatic part of the tire. In this research, to achieve a metamaterial cell suitable for a non-pneumatic tire with the objective function of increasing compressive strength and bending fatigue lifetime, an optimization was carried out for three types of geometries: a square plane, a rect...

In this paper, various bio-polymer coatings were applied on the surface of AM60 magnesium alloys through 3D-printing. These coatings were from different polymeric filaments of polylactic acid (PLA), polycaprolactone (PCL), acrylonitrile butadiene styrene (ABS), thermoplastic polyurethane (TPU), and polyethylene terephthalate glycol (PETG). Electroc...

The Stirling engine is an external combustion engine that can be utilized in electricity generation. Existing literature indicates that air is less expensive than helium as the working fluid but has the low power and efficiency. Hence, the present updated MATLAB code attempts to use a mixture of air and helium as working fluids or other mixtures of...

Non-pneumatic tires have gained a lot of attention due to their advantages, including not having to worry about getting a flat tire. In this type of tire, metamaterial cells replace the pneumatic part of the tire. In general, metamaterials are formed by stacking cells together. These cells are obtained by various methods including topology optimiza...

This research focuses on the compressive strength of metamaterial bones, fabricated by 3D printing with different porosities in cubic cells. For this objective, compressive testing was done on standard samples besides bones, both 3D-printed and real ones. To fabricate a metamaterial bone, the cubic cell was chosen in this research. Since the yield...

In the present article, fatigue properties (pure and fretting) of magnesium alloys (AM60) under cyclic bending loading were compared. For this objective, a rotary fatigue testing device was utilized with a fretting module on standard cylindrical samples under bending loads with zero means stress. The fretting fatigue condition decreased fatigue lif...

In the world, one of the leading causes of death is coronary artery disease (CAD). There are several ways to treat this disease, and stenting is currently the most appropriate way in many cases. Nowadays, the use of stents has rapidly increased, and they have been introduced in various models, with different geometries and materials. To select the...

In the present article, a microscopic investigation was done on the effect of adding nano-clay-particles into the aluminum matrix on the wear behaviors of piston aluminum-silicon alloy under various forces and speeds. Then, the variation of the wear rate and the coefficient of friction (CoF) of the alloys was reported alongside the behavior of nano...

This study introduces and compares computational fluid dynamics of Newtonian and non-Newtonian blood flow in coronary arteries with and without considering stents for the first time. Three blood flow models, including Newtonian, Carreau, and non-Newtonian power-law models, have been simulated to investigate their effect, and the solution algorithm...

Modeling of the fatigue lifetimes in 3D-printed biomaterials of Polylactic acid (PLA) is presented in this article based on machine learning (ML) techniques of interpretable extreme gradient boosting (XGBoost) and Shapley additive explanations. For this objective, standard testing samples were additive-manufactured from PLA under different 3D print...

In this article, the sensitivity analysis of heat treatment parameters including the solutioning time, ageing temperature, and addition of nano-particles on the hardness of the piston aluminum-silicon alloy (AlSi12CuNiMg) were characterized using regression analysis method. For such an objective, the clay nano-particles with 1 wt. % were used to fa...

In this dataset, experimental results of high-cycle bending fatigue testing on crankshaft ductile cast irons were presented both in raw and analyzed data. For this objective, EN-GJS-700-2 standard samples were cut and machined from the crankshaft of a gasoline engine. Then, stress-controlled rotary fatigue experiments were done on cast iron specime...

The subject of this study was fatigue crack initiation detection in a ductile cast iron (EN-GJS-700-2) crankshaft. The specimens extracted from the crank web of a car crankshaft were exposed to the four-point rotating bending fatigue test with fully-reversed loading as per ISO-1143. The fatigue crack initiation estimation was performed by (1) using...

In this research, the effect of nano-clay particles and heat-treating on thermo-mechanical fatigue (TMF) behaviors of piston aluminum-silicon (Al-Si) alloys was investigated. For this purpose, thermo-mechanical fatigue tests were conducted under out-of-phase (OP) loading conditions. Two loading conditions were checked based on different maximum tem...

This article has studied the corrosion fretting fatigue (CFF) properties of piston aluminum alloy. In addition, the impact of heat treatment and the nano-clay reinforcement on the CFF lifetime has been investigated. Furthermore, the CFF fracture behavior has been studied by field emission scanning electron microscopy (FESEM). The CFF tests showed t...

In the present experimental data, reciprocating wear testing was done on piston aluminum alloys. In some cases, this material was also reinforced by 1% wt. of clay nano-particles and also tested under wear conditions. For this objective, a permanent-mold casting process was done for the aluminum alloy sample. Besides, a stir-casting technique was u...

In this study, the Influence of the T6 heat-treating and over-ageing process on the material behavior of cylinder head Al-Si-Cu alloy under out-of-phase thermo-mechanical fatigue at maximum temperatures of 250 °C to 350 °C was investigated. The specimen is subjected to a conventional T6 process that includes a 5 hours solution at 510 °C, an air que...

The presence of cyclic loading alongside the wear increases the probability of fretting fatigue phenomenon in the cylinder head of automobiles. In the current study, the nano-reinforcing and the T6 heat-treating impact on the fretting fatigue behavior of the cylinder head aluminum alloy were studied. Fretting fatigue tests were performed in the hig...

Contemporarily, aluminum alloy is widely used in automobile industries, especially in engine parts, due to the properties of mentioned alloy like low weight ratio and proper thermal conductivity. In the presented research, twelve different heat treatments procedure were conducted on piston aluminum-silicon alloy to examine the influences of time an...

Introduction In the present article, the effect of the specimen geometry and the sample notch was studied on the high cycle fatigue lifetime and fracture behavior of the aluminum-based nanocomposite. Methods For such an objective, rotary fully-reversed bending fatigue tests were performed on smooth and notched specimens, with the frequency of 100...

Additive manufacturing (AM) is used in several industries, such as automotive, aerospace, and medical sciences. One of the most common devices used in additive manufacturing is fused deposition modeling (FDM) 3D printers. This fabrication method has different inputs that affect the quality of the parts. In this research, the bending fatigue propert...

Additive manufacturing is increasingly used for producing a variety of components. These components are often not self-contained, and therefore to form a working assembly, they must be attached to other components. In this study, ABS and PLA, two commonly used 3D printing materials, were 3D printed utilizing a Fused Deposition Modeling (FDM) machin...

Fretting fatigue (fatigue-wear) occurs when contact stresses cause cracks to form and continue to grow between two objects or surfaces in contact. By considering frictional abrasions and intermittent mechanical loads, the phenomenon of fretting fatigue can occur in vehicle engine parts. The presence of cyclic loads and the presence of wear in the e...

Designers are still seeking novel, smart and advanced materials. Moreover, a designed geometry for special purposes is also required for structures. In this regard, metamaterials are artificial structures with optimized topology. Furthermore, the multi-material metamaterial (4M) structure could be a frontier technology in different industries, espe...

This study aims to compare the fatigue behavior of similar and dissimilar polymer weld joints created after an additive manufacturing process. The fatigue samples were 3D printed in ABS and PLA using a fused filament fabrication printer. Various weld joints, including ABS/ABS, PLA/PLA, and PLA/ABS, were produced utilizing the rotary friction weldin...

In this research, the corrosion effect has been investigated on the high-cycle fatigue lifetime and the fracture behavior for the heat-treated aluminum-matrix nano-clay-composite and piston aluminum alloys. For this objective, after fabricating stir-casted nano-clay-composite, standard samples were machined and rotary bending fatigue tests were per...

This dataset describes the tribological properties of aluminum-silicon alloys when reinforced with two types of nanoparticles: silica and clay. Moreover, two types of aluminum-silicon alloys were chosen as matrices. These alloys are used in the piston and cylinder-head parts of an automobile engine part. The percentage of nanoparticles was about 1...

Topology optimization is one common technique for structural optimization methods, in which the optimal spatial distribution of structural materials or structural parts could be determined. Topology optimization is a beneficial computational approach that uses through the design process to find the superior layout based on the functional requiremen...

In this paper, the effect of the plasma nitriding (PN) process on corrosion aspects of GJS700 nodular cast iron has been investigated. The gas ratio of N2:H2 was a variable parameter that changed the electrochemical properties of cast iron. Therefore, to study corrosion properties, Tafel polarization, electrochemical impedance spectroscopy (EIS), a...

The fractographic analysis of the fracture surface is one solution to determine the kind of failures and predict the fatigue lifetime and resistance of mechanical components under cyclic loading. In the present research, the fracture behavior of the AZ91 magnesium alloy, under stress-controlled high-cycle fatigue loading, was analyzed based on the...

Objective: In this research, the built orientation in additive manufacturing on high-cycle bending fatigue properties for the acrylonitrile butadiene styrene (ABS) polymer, manufactured by fused deposition modeling, has been investigated. Then, fatigue lifetime and the fracture behavior were compared to the extruded ABS material. Fatigue properties...

A comparative study on the low-cycle fatigue properties of 316LN austenitic stainless steel with and without a hold period at the maximum tensile strain was performed. Different hold periods (0 s, 60 s, 120 s, 300 s, 1800 s) at a constant strain amplitude of ±0.8% were employed in creep-fatigue tests at 550 °C. Dynamic strain aging (DSA), creep and...

Nowadays, developing a driving cycle has become argumentative with the local country traffic infrastructure considerations to make emission standard drafts, control vehicles emissions, and also develop related parts. Aside from that, constructing a duty cycle would be a better option for vehicle parts development. In this article, the output is a h...

This article investigates the influences of heat-treating on the microstructures and the high cycle fatigue (HCF) properties of AZ91 and AZE911 (AZ91 + 1%RE) magnesium alloys. For such an objective, AZ91 and AZE911 alloys were used after solution treatment at 415°C for 5 hours aged at 215°C for 3 hours and at 215°C for 5 hours, respectively. To inv...

این مقاله به یک مطالعه موردی در زمینه ریشه¬های خرابی و علل فرسایش قالب و ابزار اکستروژن برای قطعات لاستیکی در صنعت خودرو و ارائه راهکارهای کاهش آن می‌پردازد. بر این اساس، در ابتدا سعی گردیده است که علت رفتگی با توجه به میزان زیاد سایش در قالب‌های اکستروژن و کاهش عمر آن‌ها، تعیین شود. لذا مکانیزم¬های سایش (رفتگی) به کمک دستگاه میکروسکوپ الکترونی روب...

In this study, ductile cast iron (EN-GJS700-2) was evaluated to detect the onset of cracking. The three-point bending test was performed on the samples extracted from the car web crankshaft under the conditions of control displacement loading, according to the ASTM E290 standard. The detection of crack onset was performed by a method based on acous...

Metal matrix nanocomposites are emerging rapidly among both research and industry communities. Nonetheless, the studies for their use in Low-Cycle Fatigue (LCF) applications are rarely documented. Prior to tailoring the microstructure for the desired LCF performance, it is a fundamental task to understand the structure-property correlations of the...

In this article, the influence of the nano-clay particle and heat treating has been investigated on the pure and fretting fatigue properties of the piston aluminum alloys. The base studied material was cast AlSi12CuNiMg alloy. This material was reinforced by the addition of nanoparticles (1% of nano-clay) and the T6 heat treatment. The microstructu...

This article presents cyclic hardening/softening behaviors (experimental data) of the heat-treated aluminum-matrix nano-clay-composite (AlSi_N_HT6), compared to those of the piston aluminum alloy (AlSi) under strain-controlled loading. For such an objective, standard samples were fabricated by gravity and stir-casting methods. Low-cycle fatigue exp...

In the present work, microstructural images by scanning and transmission electron microscopy have been analyzed for the surface modification of AM60 magnesium alloy. For such an objective, the pulsed electron beam irradiation technique was used at different values of the surface energy. Both scanning and transmission electron microscopes were utili...

In the present work, experimental datasets of high-cycle fatigue properties have been analyzed for aluminum-silicon alloys with the application of the engine piston. For such an objective, standard specimens were casted and machined to perform stress-controlled fatigue testing under fully-reversed cyclic bending loadings. These experiments were don...

In this dataset, experimental fatigue testing results have been presented for the additive-manufactured 3D-printed Polylactic acid (PLA) biomaterials under fully-reversed rotating-bending loadings. For such an objective, a fused deposition modeling (FDM) 3D-printer was utilized to fabricate the standard cylindrical samples with different printing p...

Additive manufacturing (AM) are used in several industries such as automotive, aerospace, and medical sciences. One of the most common devices used in additive manufacturing is fused deposition modeling (FDM) 3D printers. This fabrication method has different inputs that affect the quality of the parts. In this research, the bending fatigue propert...

Contemporarily, aluminum alloy is widely used in automobile industries, especially in engine parts, due to the properties of mentioned alloy like low weight ratio and proper thermal conductivity. In the presented research, twelve different heat treatments procedure were conducted on piston aluminum-silicon alloy to examine the influences of time an...

Contemporarily, aluminum alloy is widely used in automobile industries, especially in engine parts, due to the properties of mentioned alloy like low weight ratio and proper thermal conductivity. In the presented research, 12 different heat treatments procedure were conducted on aluminum-silicon piston alloy to examine the influences of time and te...