DAMAGE ANALYSIS OF FIBER COMPOSITE LAMINATES UNDERFOUR POINT BENDING LOAD

Abstract

Abstract: In this paper, the load-displacement response and fracture strength of _8s T300/7901 carbon fiber/epoxy composite laminate under four-point bending were investigated both experimentally and theoretically. The intra and inter layer damages of the laminate under four-point bending load were analyzed using commercial software Abaqus/CAE incorporated with micromechanical Bridging Model. The analysis scheme is implemented into a user-subroutine VUMAT, which requires input of only the constituent fiber and matrix material data. The constitutive relationship of a unidirectional lamina layer is defined using Bridging Model, and 3D Hashin′s criterion is applied to detect a fiber tensile/compressive or matrix tensile/compressive induced failure of the layer. Once a constituent failure occurs, the Camando′s method is used to degrade its elastic modulus. A thin pure matrix layer is inserted in between two adjacent lamina layers, and an interlayer de-cohesive failure is assumed when the matrix layer′s damage is attained. The simulation results are compared with our experimental data. The results show that the simulated load-displacement curve and ultimate strength agree well with the measured results. The proposed model is capable of predicting the intra- and inter-layer damages of a laminated composite.

Key words: composite laminate, four-point bending, matrix interlayer, progressive damage analysis

CLC Number:

TB332

ZHAO Yu-qing, JIANG Feng, HUANG Zheng-ming. DAMAGE ANALYSIS OF FIBER COMPOSITE LAMINATES UNDERFOUR POINT BENDING LOAD[J]. Composites Science and Engineering, 2020, 0(2): 10-18.

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