Based on analyzing the influence of stress strain relations and J integral conservation under biaxial stresses,it could be concluded that the stress strain relation curve in using increment theory elastic plastic finite element method was the important reason influencing on J integral conservation.

The stress versus strain relations and the Poisson's ratios under tension of 4 double-walled carbon nanotubes (DWCNTs) with diameters greater than 1 nm were numerically studied with the molecular dynamics method.

The present paper dealt with pressure-volume strain relations of SFRC(steel fiber reinforce concrete) materials under compaction. Fractal interpolation functions were used to calculate the data and then the iterated function system(IFS) of SFRC materials were presented.

为研究钢纤维混凝土在压力作用下与体积应变之间的关系,采用分形理论中的分形插值方法,对压力—应变关系进行了计算,导出了压力与体积应变关系曲线的迭代函数系统IFS(iterated function system)。

Based on digital speckle correlation method(DSCM),a novel video control experimental technique was developed for assessing tensile experiments. A series of tensile experiments on SnAgCu solder alloy was conducted under various constant true strain rates ranging from 10~(-5) to 10~(-3) s~(-1) and at 25℃ to 150℃. And the true stress-true strain relations and void damage evaluation law were achieved.

The researching and applying actuality about concrete strength theory and stress strain relations are stated simply and the application method of multi parameter strength criterion and nonlinear finite element stress analysis of concrete dams has been bring forward in this paper.

Tensile impact test of a unidirectional Kevlar 49/phenolic composite(KFRP)were carried out in a Bar Bar Tensile Impact Apparatus. Three high strain rates 150s 1 ,400s -1 and 1500s -1 were used in the experiments; complete stress strain relations have been obtained respectively.

Kotsovos and J. B.Newman and one way stress strain relations of concrete in concrete filled steel tubes. Three dimensional stress strain relations of concrete in concrete filled steel tubes is proved by an example analyzed by finite element program, and it can be used for three dimentional dual non linear analysis.

The experimental results indicate that the patterns of stress-strain relations are distinctly influenced by the initial shear stress in the cyclic single-direction shear tests.

In order to obtain the tensile stress-strain relations, a special fixture was used for the impact tensile specimen.

Furthermore, the axial stress-axial strain relations between laterally confined concrete under axial compression and multiaxial stress-strain relations for steel at constant high temperatures were studied.

This paper gives the stress-strain relations of the variational types on the basis of an assumption concerning the small deformation in the theory of elasto-plasticity.

According to the theory of proportional loading in elastoplasticity, we simplify the complete stress-strain relations, which are given by the increment theory of elastoplasticity.

Experimental results on thin tubes made of a 70/30 a-brass subject to the combined action of torsion and internal pressure have been presented. The loading paths include those of simple loadings, of complex loadings in which no stress component decreases, and of "neutral loadings". The stress-strain relationship has been investigated with reference to the relative orientations of the principal axes of stress and strain, to the connection between the Lode's parameters of stress- and strain-ratios,...

Experimental results on thin tubes made of a 70/30 a-brass subject to the combined action of torsion and internal pressure have been presented. The loading paths include those of simple loadings, of complex loadings in which no stress component decreases, and of "neutral loadings". The stress-strain relationship has been investigated with reference to the relative orientations of the principal axes of stress and strain, to the connection between the Lode's parameters of stress- and strain-ratios, and also to the establishment of strain-hardening characteristics. The analysis of experimental results show that under all manners of loading, the stress-strain relations appear to agree approximately with the theory of flow. For the complex loadings in which no stress component decreases, the theory of deformation can be considered as also applicable. But under the so-called "neutral loadings", in which some stress components decrease while the yield criterion is to be maintained at constant values, the experimental results seem to deviate perceptibly with all the fundamental assumptions involved in the theory of deformation. For this type of loading, strain predictions according to the slip theory also appear to differ remarkably from experimental observations.Test results also show with fair evidence that the sensitivity to the complexity of loading path of the stress-strain relations in the plastically deformed material seem to be affected by the intensity of plastic deformation attained, i.e., for a given type of complex loading, the further the deformation is brought into the plastic range, the more will the actual stress-strain relations deviate from the fundamental assumptions in the theory of deformation.

The paper gives a general review on the present status of stress-strain relations in the theory of plasticity. They are roughly grouped under four headings, viz. incremental type stress-strain relations for perfectly plastic solids; deformation type relations; linear incremental type relations for work hardening plastic solids; slip theory and non-linear type relations. Important experiments related to these theories are also mentioned. The connections between these theories are...

The paper gives a general review on the present status of stress-strain relations in the theory of plasticity. They are roughly grouped under four headings, viz. incremental type stress-strain relations for perfectly plastic solids; deformation type relations; linear incremental type relations for work hardening plastic solids; slip theory and non-linear type relations. Important experiments related to these theories are also mentioned. The connections between these theories are discussed.

In this paper, the problem of snapping of a infinitely long curved sandwich panel under external uniform pressure, induced by creep, is discussed. We suppose that the deformation of panel before buckling is symmetrical. The determination of the critical condition of snapping is reduced to an eigenvalue problem. The critical condition isfor the case of ζ2 > 3n (antisymmetrical snapping), and the critical condition isfor the case of ζ2 < 3n (symmetrical snapping).The critical lifetime of panel snapping is calculated...

In this paper, the problem of snapping of a infinitely long curved sandwich panel under external uniform pressure, induced by creep, is discussed. We suppose that the deformation of panel before buckling is symmetrical. The determination of the critical condition of snapping is reduced to an eigenvalue problem. The critical condition isfor the case of ζ2 > 3n (antisymmetrical snapping), and the critical condition isfor the case of ζ2 < 3n (symmetrical snapping).The critical lifetime of panel snapping is calculated approximately. The general stress-strain relation assumes the formIt is shown that, in the most practical condition, a satisfactory approximation of lifetime can be obtained by neglecting the elastic part of deformation and the higher power of the nondimcnsional moment. Thus we obtain a very simple formula as following: