The nonlinear mechanical behavior of two grades of PMMA at high strain-rates and large deformation were investigated experimentally. Based on Zhu-Wang-Tang's constitutive relation, by improving the nonlinear elastic terms and introducing the damage as an internal variable,a new damage-modified nonlinear viscoelastic constitutive relation is suggested,which is able to describe the "stress platform" and "constitutive instability" at large strain.
D elastic-plastic large strain finite element technique hased on U. L. method is used. A integrative analysis model on the pass function and product cross section share design is created. The instantaneous strain fields are deeply studied during 3-Roll reducing in the case of the single mill rolling with approximate ellipse pass restraint.
And the nonlinear theory formula of conical helical spring is very similar to the one of cylindrical helical spring, and therefore the nonlinear theory suit conical helical spring with big deformation as well.
Resistance of large deformation of the Wushaoling Tunnel F7 soft fault
The deduced large moment of inertia is consistent with a 2α structure with large deformation.
In this system, we propose a new method for calculating node rotation while applying a similar technique with stiffness warping to tackle the nonlinear large deformation.
A theoretical model is proposed in order to investigate rheological behavior of bubble suspension with large deformation.
The results also indicate that the sensor will maintain its properties in the case of large deformation and that it has the high compatibility with concrete structure and con meet special needs of the intelligent materials and structure.
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.
Surface wave generation in the process of finite deformation of the bottom of a basin
The finite deformation numerical analysis of three-dimensional necking deformation for the specimen was performed by applying crystal plasticity theory associated with a numerical algorithm suggested by the first author.
The contact problem at the pin/hole boundary, progressive damage, finite deformation and nonlinear material behavior are taken into account when developing the analytical tool.
The finite deformation strains in the von Karman sense are incorporated in the geometrical nonlinear postbuckling analysis.
Based on a layered Theological model of the lithosphere, the velocity and stress distributions in the lithosphere under horizontal drag underneath were calculated using viscoelastic finite element method of plain strain with finite deformation.