Experimental and computational analysis of bending fatigue failure in chopped carbon fiber chip reinforced composites

被引:7
作者
Tang, Haibin [1 ,2 ]
Zhou, Guowei [3 ]
Sun, Qingping [1 ,4 ]
Avinesh, Ojha [5 ]
Meng, Zhaoxu [6 ]
Engler-Pinto, Carlos [5 ]
Su, Xuming [5 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Intelligent Mfg, Nanjing 210094, Peoples R China
[2] Natl Univ Singapore, Dept Mech Engn, Singapore 117575, Singapore
[3] Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Shanghai 200240, Peoples R China
[4] McMaster Univ, Dept Mech Engn, Hamilton, ON L8S 4L7, Canada
[5] Ford Motor Co, Res & Innovat Ctr, Dearborn, MI 48124 USA
[6] Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA
关键词
Chopped carbon fiber chip reinforced composites; Sheet molding compound; Four-point bending fatigue; Fiber orientation; Hybrid micro-macro computational model; MOLDING COMPOUND SMC; ORIENTATION; DAMAGE; LIFE; PREDICTION; BEHAVIOR; MODULUS; TENSORS; TENSILE; MODEL;
D O I
10.1016/j.compstruct.2021.114402
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
With a better balance among good mechanical performance, high freedom of design, and low material and manufacturing cost, chopped carbon fiber chip reinforced sheet molding compound (SMC) composites show great potential in different engineering applications. In this paper, bending fatigue behaviors of SMC composites considering the heterogeneous fiber orientation distributions have been thoroughly investigated utilizing both experimental and computational methods. First, four-point bending fatigue tests are performed with designed SMC composites, and the local modulus is adopted as a metric to represent the local fiber orientation of two opposing sides. Interestingly, SMC composites with and without large discrepancy in local modulus of opposing sides show different fatigue behaviors. Interrupted tests are conducted to explore the bending fatigue failure mechanism, and the damage processes of valid specimens are also closely examined. We find that the fatigue failure of SMC composites under four-point bending is governed by crack propagation instead of crack initiation. Because of this, the heterogeneous local fiber orientations of both sides of the specimen influence fatigue life. The microstructure of the lower side shows a direct influence while that of the upper side also exhibiting influence which becomes more prominent for high cycle fatigue cases. Furthermore, a hybrid micro -macro computational model is proposed to efficiently study the cyclic bending behavior of SMC composites. The region of interest is reconstructed with a modified random sequential absorption algorithm to conserve all the microstructural details including the heterogeneous fiber orientation, while the rest of the regions are modeled as homogenized macro-scale continua. Combined with a framework to capture the progressive fatigue damage under cyclic bending, the bending fatigue behaviors of SMC composites are accurately captured by the hybrid computational model comparing with our experimental analysis.
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页数:12
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