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.

Different from existent methods,probability based modified Ramberg Osgood stress strain relations (P ε σ curves) are newly introduced to take into account the scatter of stress strain responses,where the metallurgical quality of material is not enough good i.e.weld metal to show a same stress strain response for different specimens under same loading level.

The information on stress strain relations is contained in the test data, so it is possible to abstract the constitutive law directly from that. The neural network is a powerful inversion approach, by means of which the nonlinear and elastoplastic neural network models for sand and cohesive soil are built.

At first,this paper decides the stress strain relations of steel and core concrete of concrete filled square steel tubes. In the core concrete's stress strain relations,the interaction of steel tube and core concrete is considered.

An attempt to predict the stress strain relations of the core concrete after sustaining axially compressive load by means of a model that is proposed in this paper. The load deformation behavior of the FRP confined concrete columns was computed,and the influence of the changing load ratio,slenderness ratio,FRP ratio and strength of the materials on the bearing capacity of the members after creep was discussed.

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.

The calculated results show that the model considering both elasto plastic and anisotropic characteristics in determining soil stress strain relations agrees quite closely with the actual state.

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.

A note on stress strain relations of the linear theory of shells

The mathematical expressions for the stress strain relations of metals in uniaxial loading, which have been proposed by Ludwik and Hollomon and find a more general application now, are discussed.

We see that dab and de, are involved linearly, wherefore the stress-strain relations are incrementally linear.

We plan to study stress strain relations in mixtures of lipids to study the feedback between stress and phase separation.

Using analytical methods by membrane and plasticity theories, stress-strain relations were derived.

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-...

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...

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: