Article

DETERMINATION OF THE STRENGTH OF FIBERGLASS-REINFORCED PLASTIC TUBES IN THE PLANE STRAINED STATE.

June 1986

Authors:

Show all 5 authorsHide

A design of working clamps is proposed for fastening composite material tubular specimens in an Instron-1275 test machine. In tests of specimens subjected to tension, torsion, internal pressure, or the combined action of these force factors the proposed clamps operate sufficiently reliably. Compression tests were made on tubular specimen with an outer diameter of 121 mm, an inner diameter of 108, and a length of 100 mm. The working clamps and the device described make it possible to test tubular specimens of composite materials in the plane stressed state and ring specimens in compression.

ResearchGate has not been able to resolve any citations for this publication.

ResearchGate has not been able to resolve any references for this publication.

Article

The Strength Characteristics of Combination Joints of Adhesion with Bolts : the case where adherends...

September 1988 · Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A

The present paper deals with the strength characteristics of T-type butt adhesive joints combined with bolts, in which two T-flanges are clamped by two sets of bolts and nuts with an initial clamping force after they are joined by adhesion. Firstly, the stress distributions in adhesives, the variation of bolt axial force and the strength of the combination joints are analyzed when an external ... [Show full abstract] bending moment is applied to the combination joint. For verification, experiments are performed. Analytical results are in fairly good agreement with experimental ones. Then, it is found that the strength of the combination joint is greater than that of the adhesive joint and that the shape as a joint is maintained after the adhesive layer is ruptured in the combination joint. The characteristics and the availabilities of a combination joint are made clear.

Article

On the strength of the contacts between coal particles in the caking process

October 1982

Fomin

The strength of the contacts forming between individual coal particles in the plastic state largely determines the coke strength and properties. In an experimental apparatus, coal particles were heated and, at the same time, were brought together and drawn apart repeatedly in an inert atmosphere at a reduced pressure of 50 Pa. Thermocouples were used to measure the particle temperatures. A ... [Show full abstract] formula was derived enabling the contact force and parting stress to be calculated, taking account of the geometry of the apparatus.

Article

Behavior of Bolted Joints Tightened in Plastic Region. Allowable Load on Joints.

October 1992 · Journal of the Japan Society for Precision Engineering

The allowable load on bolted joints tightened in the plastic region is studied experimentally. Behavior of the joints are investigated in different tightening region of the bolt such as elastic region, yield point and plastic region, varying stiffness of clamped parts and the strength grade of the bolt. As a result, it is shown that the additional elastic increase in the axial tension of the bolt ... [Show full abstract] under external load is independent of the joints stiffness or the elongation of the bolt at tightening. Load capacity of the joints tightened in plastic region is higher than that in elastic region by 5-10%. Permitting the decrease of initial clamping force by 10%, the allowable load is 90% of the yield strength of the bolt for the joint having lower stiffness, and is equal to the yield strength for one having higher stiffness. The allowable load estimated in the joint (load cell) whose stiffness is lower than actual condition is in safety zone.

Article

Stress Analysis in the Preparation of Bilayer Membranes by Co-sintering Process: Stress Analysis in...

June 2009 · Journal of Inorganic Materials

Based on the theory of 'constrained sintering', stress of the membrane exerted by a rigid substrate was calculated. Results show that the tensile stress from supports can decrease driving force and consequently increase the sintering temperature of supported membranes. The optimal sintering temperatures, 1350°C and 1180°C for α-Al2O3 and ZrO2 supported membranes respectively, are determined by ... [Show full abstract] combining membrane strength and sintering driving force. Meanwhile, a method is proposed to calculate the stress developed in the co-sintering process of the supported multilayer membrane. For ZrO2/α-Al2O3 bi-layer membrane, the calculated results show that due to the contribution of the compressive stress, the sintering driving force increases and the α-Al2O3 membranes can be sintered effectively after co-sintering at 1200°C. Moreover, the top-layer ZrO2 membrane should be thicker than 10 μm so as to exert sufficient compressive stress on the sub-layer α-Al2O3 membrane with thickness of 15 μm.

Article

Full-text available

The single-step joint – a traditional carpentry joint with new possibilities

June 2017 · International Wood Products Journal

Jan Siem

The European rules of timber structural design do not include distinct rules on carpentry joints. As a contribution towards filling this gap, this study into the existing knowledge of the most commonly used carpentry joint, the single-step joint, is performed. The design rules of three European countries and the latest developments on the topic are discussed. This study shows that the knowledge ... [Show full abstract] of expected stress distributions as a consequence of the geometric shape is important to achieve the intended reliability level for joints. The investigation indicates that further research on the combination of shear and compression forces is necessary to improve and include in the design rules in Eurocode 5.

Article

Two-parameter fracture criterion and hardening of the material

September 1986

Yury G. Matvienko

The attempts to develop a united method of evaluating the cracking resistance of the material and calculating components with a crack in brittle and plastic states resulted in the formulation of two-parameter fracture criteria which hold both at high plastic strains and short cracks and low plastic strains and long cracks. The two-parameter fracture criteria are used on an increasing scale in ... [Show full abstract] calculating the strength of components with cracks in practice. At the same time, insufficient experience has been gained in using the two-parameter fracture criteria for rapid evaluation of the cracking resistance of materials. In this paper, the authors propose a modification of the two-parameter fracture criterion and a method of rapid evaluation of the cracking resistance of the materials based on this criterion. The authors also examine the effect of the parameter for strain hardening of material on the cracking resistance of the material. For a linearly elastic body with a crack, the criterion yields Irwin's single-parameter force criterion of fracture for the conventional stress intensity factor calculated from the equation of linear fracture mechanics into which the measured forces were substituted. From this, the authors were able to derive the two-parameter equation for the limiting value of the contour integral which was used to propose the method of rapid evaluation of the cracking resistance of the materials in the presence of cracks of various length.

Chapter

Effect of thermal stress on the performances of the multi-bundle integrated-planar solid oxide fuel...

January 2016

Hamid Mounir

Thermal stress is an important phenomenon that can be found in many technical machines. In this work we investigate the influence of the thermal stresses on the performances of the integrated-planar solid oxide fuel cell IP-SOFC and essentially the durability of the cell elements which is a major technical barrier to the commercial viability. The durability of the IP-SOFC is strongly influenced ... [Show full abstract] by the thermal stresses arising from the CTE mismatch between components and from thermal gradients. Stress occurring during operation due to the fragile nature of ceramic material, operation in or near the material plastic limit can have an important consequence on a structure’s strength and stability, potentially causing cracks or breaks within certain components. The results obtained in this study will be discussed in order to understand this phenomenon; a set of conclusions will be drawn.

Article

An Influence of Mean Stress on Fatigue Strength and Fatigue Fracture Origins for Aluminum Alloy Bolt

January 2016 · The Proceedings of the Materials and processing conference

Accidents due to fatigue of bolted joints frequently occur. In fatigue characteristics of bolts made of high strength steel alloy, it is well-known that the mean stress which is applied on the bolt as clamping force does not have an influence on the fatigue strength. But an influence of the mean stress on fatigue strength for bolt made of non-ferrous materials has not been investigated yet. In ... [Show full abstract] this study, fatigue test for a bolted joint made of aluminum alloy A5056 were conducted to investigate the influence of mean stress on fatigue strength. The result showed that fatigue strengths for A5056 bolts decreased with an increase in the mean stress. It is considered as one of the causes that fatigue fracture origins were different in A5056 bolt. And fatigue fracture origins tended to be affected by stress amplitude.

Article

Fuzzy Reliability Design Based on Gamma and Normal Distribution

December 2008

With considering lightening and safety of strength, integrations of both distributionpsilas density and functionpsilas density, the fuzzy reliability formulas about machine parts that forces are normal distribution, strengths are gamma distribution and subordinate is parabola of exponential k was gotten; First integral change was achieved according to initial data and function imported and extent ... [Show full abstract] of integrated, second the number result with VB program in the computer was achieved by using middle-points integral calculus and romberg integration. This program can be used in design of machine parts for rising up level of design.

Article

Study of generalized tangent bulk modulus

July 2007

Tangent bulk modulus of soil in the triaxial state of stress was researched. The different influences on tangent bulk modulus of conventional triaxial test and isotropic compression test were considered. On the basis of Hooke's law, volume work is divided into plastic volume work and elastic volume work and then the influence coefficients on tangent bulk modulus of two kinds of triaxial tests ... [Show full abstract] were calculated. Using the values of tangent bulk modulus from two types of triaxial tests and the influence coefficients, the generalized tangent bulk modulus could be acquired. The results of verification show that generalized tangent bulk modulus is more typical and reliable.

Article

OS1725 Impact Compressive Characteristics of Polyimide Foam at Various Temperature

July 2014 · The Proceedings of the Materials and Mechanics Conference

In order to clarify the effect of strain rate and test temperature on the compressive strength of polyimide foam, a series of compression tests for the polyimide foam with two different densities were carried out. By using three testing devices, i.e. universal testing machine, dropping weight machine and direct impact apparatus, we performed a series of compression tests at various strain rates ... [Show full abstract] (10^<-3>〜10^3 s^<-1>) and at several test temperatures in the range of -190 ℃ to 270 ℃. At over 100 s^<-1>, the remarkable increase of flow stress was observed. The negative temperature dependence of strength was also observed.

Chapter

Effect of inelastic behavior of cables on ultimate behavior and strength of a 600-m steel cable-stay...

December 2003

This chapter describes the effect of inelastic behavior of cables on ultimate behavior and strength of steel cable-stayed bridges based on elastoplastic finite-displacement analysis. Since the main girder is subjected to large compressive force, the plastic elongation of cables leads immediately to the buckling of the girder or collapse of the bridge. The load parameter at ultimate state of the ... [Show full abstract] bridge is estimated from a simple calculation. It is a ratio of the proof stress of the cable to maximum working stress in the cable. Because of calculation, it clears the effect of the safety factor or cable size on the ultimate behavior and strength and proposes a simple formula for estimating the load parameter at ultimate state.