Compressive fatigue response and reliability analysis of thermoplastic composite with low-velocity impact damage,Polymer Composites

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Compressive fatigue response and reliability analysis of thermoplastic composite with low-velocity impact damage
Polymer Composites ( IF 4.8 ) Pub Date : 2021-09-01 , DOI: 10.1002/pc.26279
Jiwei Chen ₁ , Weixing Yao _{1,

2} , Hanyu Lin ₁

Affiliation

Thermoplastic composite has attracted more and more attentions for its higher fracture toughness and better damage tolerance than thermosetting composites. AS4/PEEK laminate is a representative thermoplastic composite, which has been widely used in the fabrication of fuselages and aircraft wings. In this paper, low-velocity impact tests had been carried out on AS4/PEEK laminates. Different impact energy levels were selected for forming impact dent with depth of 1 mm for the three stacking sequences: [0/0/-45/90/45/0/0/45/90/-45/0]_S, [0/0/45/90/-45/0/45/90/-45/0]_S, and [45/-45/0/45/90/-45/0/45/-45/0]_S, which were 25.5, 21.0, and 20.0 J successively. Then, compression–compression fatigue tests with stress ratio of 10 and frequency of 10 Hz were used to obtain the residual fatigue life and damage propagation. It was found that significant local buckling appeared around the impact dent, which extended perpendicular to the loading direction during the compressive fatigue loading. The increase of the transverse dimension of local buckling could be divided into three stages. The experimental results indicated that a joint Weibull distribution could be used to describe the residual compressive fatigue life of the impacted laminates. This paper assumed an equal rank relationship between the residual strength and fatigue life, and the B-basis value of fatigue stress was calculated to ensure the reliability of the impacted AS4/PEEK laminates, which were 0.53, 0.50, and 0.53 (normalized by residual compressive stress) at 10⁶ cycles for the three kinds of laminates mentioned earlier.

中文翻译：

低速冲击损伤热塑性复合材料的压缩疲劳响应及可靠性分析

热塑性复合材料以其比热固性复合材料更高的断裂韧性和更好的损伤耐受性而受到越来越多的关注。AS4/PEEK层压板是一种具有代表性的热塑性复合材料，已广泛用于机身和飞机机翼的制造。在本文中，对 AS4/PEEK 层压板进行了低速冲击试验。选择不同的冲击能级形成深度为 1 mm 的三个堆叠序列的冲击凹痕：[0/0/-45/90/45/0/0/45/90/-45/0] _S , [0 /0/45/90/-45/0/45/90/-45/0] _S和 [45/-45/0/45/90/-45/0/45/-45/0] _S，分别为 25.5、21.0 和 20.0 J。然后，采用应力比为 10，频率为 10 Hz 的压缩-压缩疲劳试验来获得残余疲劳寿命和损伤扩展。结果表明，冲击凹痕周围出现了明显的局部屈曲，在压缩疲劳载荷期间，冲击凹痕垂直于载荷方向延伸。局部屈曲横向尺寸的增加可分为三个阶段。实验结果表明，联合威布尔分布可用于描述受冲击层压板的残余压缩疲劳寿命。本文假设残余强度与疲劳寿命呈等阶关系，计算疲劳应力的B基值，以确保冲击AS4/PEEK层压板的可靠性，前面提到的三种层压板的⁶个循环。

更新日期：2021-11-09

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