3D elastic-plastic analysis and experiment of free edge effects in angle-ply thermoplastic composite laminates

摘要

The fully three-dimensional orthotropic elastic-plastic analysis of interlaminar stresses and deformation for AS4/PEEK thermoplastic laminates is developed in this paper, and used to simulate the tensile stress-strain curves for [+- 25]_(S4) laminates. Under uniaxial tensile loading, the 3D orthotropic elastic-plastic FE analysis and microscopic moire interferometry of interlaminar stresses and deformation are carried out for the [+- 25]_(S4) laminates. It is found that the numerical tensile stress-strain curves of [+- 25]_(S4) laminates agree with experimental. The numerical interlaminar displacement u and shear strain γ_(xz) are also consistent with the experimental results obtained by moire interferometry.