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A Jones-Nelson model has been applied to depict nonlinear stress-strain relations ofcomposite laminae,where mechanical properties were expressed by strain energy density.The nonlin-ear material matrix is only a function of the strain energy density.Then a material model could beconveniently applied under complex stress condition.In this paper,by introducing large displacementstress-strain measurement and varying-Poisson’s ratio idea,an improved Jones-Nelson material modelis presented,where the expanding problem of material properties and convergence problems are over-come.Meanwhile a discuss of the reorientation of fiber and a material nonlinear analysis of rubbercomposite lamina under super large deformation conditions are made.The prediction results of im-proved material model are in fairly good agreement with those of the experiments.
A Jones-Nelson model has been applied to depict nonlinear stress-strain relations of composites laminae, where mechanical properties were expressed by strain energy density. The nonlin-ear material matrix is only a function of the strain energy density. Chen a material model could beconveniently applied under complex stress condition. This paper, by introducing large displacement stress-strain measurement and varying-Poisson’s ratio idea, an improved Jones-Nelson material model presented, where the expanding problem of material properties and convergence problems are over-come. discuss of the reorientation of fiber and a material nonlinear analysis of rubbercomposite lamina under super large deformation conditions are made. prediction result of im-proved material model are in fairly good agreement with those of the experiments.