Effect of patch length and elevated temperature on fatigue behaviour of repaired aluminium panels with a CFRP patch

IF 2.9 4区 材料科学 Q2 ENGINEERING, CHEMICAL
H. Shinde, Nikhil Sonawane, M. Karnik, Prashanth Kumar
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引用次数: 2

Abstract

ABSTRACT Thin panels of aluminium alloy 6061-T6 with a centre pre-crack were repaired with a one-sided asymmetrical CFRP patch through co-curing of epoxy at the room temperature to have minimal residual stresses. The specimens were tested with a tension-tension fatigue load. The numerical simulation as well as the experiments showed that the fatigue life was improved considerably with the increasing patch length when tested at room temperature. In the asymmetrical repair with a single patch, a bending moment was induced whose magnitude decreased with the increasing patch length, resulting into longer fatigue life. The specimens failed through the growth of the pre-crack in the skin. However, the crack in the skin did not grow in case of the specimen with the longest patch length and the failure occurred at substantially higher number of fatigue cycles through a different mechanism in the bare portion of the aluminium alloy skin. Experiments were also conducted at the elevated temperature of 80°C. Thermal compressive stresses were developed in the aluminium alloy panel due to the vast difference in the coefficient of thermal expansion of the aluminium alloy and the CFRP patch. Consequently, the stress intensity factor of the crack in the aluminium panel was reduced considerably, resulting into the increase of the fatigue failure life significantly.
贴片长度和升高温度对CFRP贴片修复铝板疲劳性能的影响
采用室温环氧树脂共固化的方法,对6061-T6铝合金薄板进行单侧不对称CFRP补片修复,使残余应力最小。试件进行了拉-拉疲劳载荷试验。数值模拟和试验结果表明,在室温下,随着贴片长度的增加,其疲劳寿命得到了显著提高。在单片不对称修复中,会产生弯矩,弯矩的大小随补片长度的增加而减小,从而延长疲劳寿命。由于皮肤预裂的生长,试样失效。然而,在斑块长度最长的情况下,表皮中的裂纹没有扩大,并且在铝合金表皮裸露部分通过不同的机制在更高的疲劳循环次数下发生破坏。在80℃的高温下也进行了实验。由于铝合金和碳纤维布贴片的热膨胀系数存在巨大差异,在铝合金板中产生了热压应力。从而大大降低了铝板裂纹的应力强度因子,从而显著提高了铝板的疲劳失效寿命。
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来源期刊
Journal of Adhesion
Journal of Adhesion 工程技术-材料科学:综合
CiteScore
5.30
自引率
9.10%
发文量
55
审稿时长
1 months
期刊介绍: The Journal of Adhesion is dedicated to perpetuating understanding of the phenomenon of adhesion and its practical applications. The art of adhesion is maturing into a science that requires a broad, coordinated interdisciplinary effort to help illuminate its complex nature and numerous manifestations.
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