Abstract
The interlaminar deformation behaviors of thermoplastic AS4/PEEK composite laminates subjected to static tensile loading are investigated by means of microscopic moire interferometry with high spatial resolution. The fully three- dimensional orthotropic elastic-plastic analysis of interlaminar deformation for the thermoplastic laminates is developed in this paper, and used to simulate the stress-strain curves of tensile experiment for its angle-ply laminates. Under uniaxial tensile loading, the 3D orthotropic elastic-plastic FE analysis and microscopic moire interferometry of interlaminar deformations are carried out for the (±25)S4 laminates. The quantitative local-filed experimental results of interlaminar shear strain and displacements at free- edge surface of the laminate are compared with corresponding numerical results of the orthotropic elastic-plastic FE model. It is indicated that the numerical tensile stress- strain curves of angle-ply laminates computed with 3D orthotropic elastic-plastic model are agree with experimental results. The numerical interlaminar displacement U and shear strainxz are also consistent with the experimental results obtained by moire interferometry. It is expected the elastic-plastic interlaminar stresses and deformations analysis for the optimal design and application of AS4/PEEK laminates and its structures.
Highlights
AS4/PEEK laminates is a high-performance thermoplastic composite material which is widely used in the aerospace industry [1]
In present work the interlaminar deformation of thermoplastic composite AS4/PEEK laminates subjected to static tensile loading are investigated by means of microscopic moiré interferometry and three-dimensional orthotropic elastic-plastic finite element (FE) method
The intent of this paper is to present accurate experimental results for the interlaminar displacement and strain at free edge for the AS4/PEEK angle-ply laminates, and to compare the experimental results with above FE numerical results obtained using the three-dimensional orthotropic elastic-plastic model
Summary
AS4/PEEK laminates is a high-performance thermoplastic composite material which is widely used in the aerospace industry [1]. In present work the interlaminar deformation of thermoplastic composite AS4/PEEK laminates subjected to static tensile loading are investigated by means of microscopic moiré interferometry and three-dimensional orthotropic elastic-plastic finite element (FE) method. The intent of this paper is to present accurate experimental results for the interlaminar displacement and strain at free edge for the AS4/PEEK angle-ply laminates, and to compare the experimental results with above FE numerical results obtained using the three-dimensional orthotropic elastic-plastic model. Interlaminar deformations, such as shear strain and displacements, are emphasized because the moiré interferometry technique, which is used for the experimental measurements, provides displacements directly. A second goal of this investigation is to gain a better understanding of the influence of PEEK matrix ductility on interlaminar elastic-plastic deformation in AS4/PEEK thermoplastic composite laminates
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