Based on the theoretical analysis and simulating test of the large strain method checking quality of pile foundation,this paper gives the frequency specrum and it is assured to be practical value.

The study proves that the J2 flow theory of large strain plasticity is more sensitive to the shape of the defect than the J2 deformation theory of large strain plasticity.

integrative analysis model on the pass function and product crosssection shape design is created by using the 3-D elastic-plastic large strain finiteelement technique based on U.L method.

The large strain constitute equations are derived according to nonlinearcontinuum mechanics, the rate of Jaumann stress and the theory of Boit consolidationon account of the limitation of small strain theory in hydraulic fill, soft ground andlarge displacement projects.

Although the accumulative damage characteristic (or called low cycle fatigue character) has close inner relation with the high cycle fatigue character(which has been studied for many years) of concrete under common working stress, the systemic research reports on the behavior of concrete under low cycle fatigue with large strain haven’t been found until now.

In order to formulate the compressive stress-strain model of concrete considering the behavior of low cycle fatigue under large strain,several fatigue tests of HSC prisms under axial compression with specified large constant maximum strain amplitude are carried out by the displacement-controlled loading function of the numeric electro-hyraulic servo test machine and the maximum strains beyond ε_0 of which are under various levels(ε_0 is the strain corresponding to the peak stress σ_o).

Based on the design drawing,the geological properties,the large strain dynamic testing results and the pipe singking records of a continious cross-over bridge and an interchangbridgeof Shanghai A5 Jiajin Freeway,the paper analyzes the influencefactors of the capacity of pretensioned spun high strength concrete piles and puts forward several propersals.

After first deformation with low strain rate, the stresses of second deformation decrease and a large strain degree is obtained due to the grain refining through dynamic recrystallization.

A large strain of 1.4% during the martensitic transformation has been observed in the textured Ni 50.5 Mn 24 Ga 25.5 polycrystal prepared by vertical zone melting unidirectional solidification.

Large strain tensile properties of Polycarbonate/ acrylonitrile butadiene styrene(PC/ABS) polymer were experimentally investigated at different environmental temperatures in this paper.

However, it is applicable in large strain and long inter-pass time.

The influence of ultrasound vibrations manifests itself at large strain amplitudes (～10-4), where nonlinear, amplitude-dependent absorption of ultrasound is observed to occur.

Comparison of the RKPM and the FEM under identical conditions showed that the RKPM is more suitable for problems where there exists extremely large strain such as in the case of slope sliding.

By using the large strain two-dimension plane strain model and elastic-plastic finite element method, the cause for peeling damage of Cu-Fe-P lead frame alloy was investigated.

In contrast, for the full lamellar microstructure the high anisotropy of deformation and the large strain discontinuity at grain boundaries resulting in decohesion of grain boundaries are the main fracture processes.

In Composites, application of relatively low transverse strains or stresses can lead to locally large strains or stress in the matrix. It is therefore necessary to evalute the strain or stress concentration factors. A simple discussion of strain or stress magnification factors based upon a strength of materials type of approach is given by schulz in 1963. However, Foye 1966 solved the stress concentraton problem by finite element method indicating that the maximam stress concentration...

In Composites, application of relatively low transverse strains or stresses can lead to locally large strains or stress in the matrix. It is therefore necessary to evalute the strain or stress concentration factors. A simple discussion of strain or stress magnification factors based upon a strength of materials type of approach is given by schulz in 1963. However, Foye 1966 solved the stress concentraton problem by finite element method indicating that the maximam stress concentration in the matrix is far less than the one that may be inferred from the schulz approximate approach, stress function method are used by H Schuerch 1967 to determine the field of stress concentration produced by cylindrical inclusions in an other wise homgeneous matrix material subject to an applied stress transverse to the inclusion axis. More recently, L.C. Lee, H.D.Conway 1978 using the method by muschelisvili derived the bond stress for composite material reinforced with various arrays of fibers.Results from both schuerch and Lee-Conway also give stress concentration factors several times less than that by Sshulz.All those outined above are surveyed and another model of analysis be proposed to give an approximate solutions of this problem in this study.

Constant angular difference rotational mismatch method of Moire proposed in this paper is suitable for determining the strain states of different points in general non-homogeneous strain field. While measuring elastic or moderate plastic strains, only one analyzer grating with pitch equal to the specimen grating is necesssary and appropriate sensitivity can be attained complete strain solution of constant angular difference rotational mismatch method is derived in exact and simplified...

Constant angular difference rotational mismatch method of Moire proposed in this paper is suitable for determining the strain states of different points in general non-homogeneous strain field. While measuring elastic or moderate plastic strains, only one analyzer grating with pitch equal to the specimen grating is necesssary and appropriate sensitivity can be attained complete strain solution of constant angular difference rotational mismatch method is derived in exact and simplified expressions. The former of which is suitable for either small or large strains. Approach to determine the regions of different variables is proposed in order to measure strains during high sensitivity. The experimental device is designed and the stress concentration test by axial load is accomplished. Good agreement is found in a comparison of the experimental results to the theoretical solution.

The effect of large strain and high triaxiality farours the initiation and growth of voids in many ductile materials. This causes volumetric dilatation in the plasticity. So, dilatational plastic constitutive equations are proposed as eq. (1) and the inverse form in eq. (4). In which, Etm(p) is the volumetric plastic tangent modulus. When Etm(p)→∞, then yields the conventional Prandtl-Reuss equations. In eqs. (5) and (6) the criteria of strain softening are given, when either of these condition is...

The effect of large strain and high triaxiality farours the initiation and growth of voids in many ductile materials. This causes volumetric dilatation in the plasticity. So, dilatational plastic constitutive equations are proposed as eq. (1) and the inverse form in eq. (4). In which, Etm(p) is the volumetric plastic tangent modulus. When Etm(p)→∞, then yields the conventional Prandtl-Reuss equations. In eqs. (5) and (6) the criteria of strain softening are given, when either of these condition is met Ete(p) or Etm(p) turns to negative. The six material constants Ete(p), Etm(p), λe,σce,λm and σcm can be calibrated and justified by using the necking tests of axisymmetric bars (with and without notches) and the computer simulation technique. The importance of the dilatational plastic effect and the strain softening is delineated in figs. 5,6,7.