Modeling study on the mechanical performance of CFRP/Al single-lap rivet joints under hygrothermal environmental conditions

材料科学 铆钉 有限元法 复合材料 分层(地质) 结构工程 碳纤维增强聚合物 复合数 接头(建筑物) 模数 工程类 俯冲 构造学 生物 古生物学
作者
Shiguang Zhang,Xuda Qin,Shipeng Li,Hao Li,Yanwei Xu,Guoyu Fu
出处
期刊:Journal of Reinforced Plastics and Composites [SAGE Publishing]
被引量:1
标识
DOI:10.1177/07316844241246819
摘要

Carbon Fiber Reinforced Polymers (CFRP) and aluminum alloys, owing to their exceptional mechanical properties and lightweight attributes, are extensively used in aircraft manufacturing. However, prolonged exposure to a hygrothermal environment can compromise the mechanical integrity of composite joint structures. In this paper, accelerated aging experiments were designed to test the mechanical properties of CFRP after hygrothermal aging, a novel mechanical property prediction model tailored for the hygrothermal coupled environment is presented. The model accurately predicts the modulus and strength of CFRP after hydrothermal aging. A three-dimensional finite element model for the CFRP interference riveted structure, considering a tri-coupled state of moisture, temperature, and force was established by the application of subroutine and field superposition. The precision of this finite element model has been affirmed through accelerated aging tests. By integrating finite element analysis with experimental methods, this research delves into the failure modes and mechanisms of CFRP and its joints under hygrothermal conditions. It was discerned that the hygrothermal environment undermines the bond between fibers and the matrix, resulting in pronounced interlaminar delamination and shear failure in CFRP. The failure forms gradually change from “flaky” at lower levels of aging to “filamentary” at higher levels of aging. For CFRP riveted structures, the hygrothermal conditions influence their loadbearing capability and shift the primary positions of failure.
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