Micromechanical modeling of longitudinal tensile behavior and failure mechanism of unidirectional carbon fiber/aluminum composites involving fiber strength dispersion  

作　　者：Qipeng LIU Wengang JIANG Yuehua GAO Zhenjun WANG Shanshan SHI Zhi SUN 

机构地区：[1]Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components,Nanchang Hangkong University,Nanchang 330063,China [2]School of Locomotive and Rolling Stock Engineering,Dalian Jiaotong University,Dalian 116028,China [3]State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,China

出　　处：《Chinese Journal of Aeronautics》2024年第9期312-327,共16页中国航空学报（英文版）

基　　金：the National Natural Science Foundation of China(No.52165018);the Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Component,China(No.EL202303270);the Jiangxi Provincial Department of Science and Technology,China(No.20225BCJ22002)

摘　　要：This paper examines the longitudinal tensile behavior and failure mechanism of a new unidirectional carbon fiber reinforced aluminum composite through experiments and simulations.A Weibull distribution model was established to describe the fiber strength dispersion based on single-fiber tensile tests for carbon fibers extracted from the composite.The constitutive models for the matrix and interface were established based on the uniaxial tensile and single-fiber push-out tests,respectively.Then,a 3D micromechanical numerical model,innovatively considering the fiber strength dispersion by use of the weakest link and Weibull distribution theories,was estab-lished to simulate the progressive failure behavior of the composite under longitudinal tension.Due to the dispersion of fiber strength,the weakest link of the fiber first fractures,and stress concentra-tion occurs in the surrounding fibers,interfaces,and matrix.The maximum stress concentration fac-tor for neighboring fibers varies nonlinearly with the distance from the fractured fiber.Both isolated and clustered fractured fibers are present during the progressive failure process of the composite.The expansion of fractured fiber clusters intensifies stress concentration and material degradation which in turn enlarges the fractured fiber clusters,and their mutual action leads to the final collapse of the composite.

关 键 词：Fiber reinforced metals Finite element method 3D micromechanical model Fiber strength dispersion Longitudinal tension Progressive failure 

分 类 号：V258[一般工业技术—材料科学与工程]