Study of free edge effect on sub-laminar scale for thermoplastic composite laminates

Min Shen; Huanbao Lu; Jingwei Tong; Yishi Su; Hongqi Li; Yongmin Lv

doi:10.1117/12.839334

25 August 2009 Study of free edge effect on sub-laminar scale for thermoplastic composite laminates

Min Shen, Huanbao Lu, Jingwei Tong, Yishi Su, Hongqi Li, Yongmin Lv

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 737557 (2009) https://doi.org/10.1117/12.839334
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

The interlaminar deformation on the free edge surface in thermoplastic composite AS4/PEEK laminates under bending loading are studied by means of digital image correlation method (DICM) using a white-light industrial microscopic. During the test, any artificial stochastic spray is not applied to the specimen surface. In laminar scale, the interlaminare displacements of [0/90]_3s laminate are measured. In sub-laminar scale, the tested area includes a limited number of fibers; the fiber is elastic with actual diameter about 7μm, and PEEK matrix has elastic-plastic behavior. The local mesoscopic fields of interlaminar displacement near the areas of fiber-matrix interface are obtained by DICM. The distributions of in-plane elastic-plastic stresses near the interlaminar interface between different layers are indirectly obtained using the coupling the results of DICM with finite element method. Based on above DICM experiments, the influences of random fiber distribution and the PEEK matrix ductility in sub-laminar scale on the ineterlaminar mesomechanical behavior are investigated. The experimental results in the present work are important for multi-scale theory and numerical analysis of interlaminar deformation and stresses in these composite laminates.

Citation Download Citation

Min Shen, Huanbao Lu, Jingwei Tong, Yishi Su, Hongqi Li, and Yongmin Lv "Study of free edge effect on sub-laminar scale for thermoplastic composite laminates", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 737557 (25 August 2009); https://doi.org/10.1117/12.839334

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