Few studies have investigated the fatigue of composite laminates under cyclic compression loading. Moreover, the self-heating approach to rapidly predict fatigue life has rarely been applied to this type of material. The objective of this work is to study the fatigue of a quasi-isotropic laminate under compression-compression loadings and to assess the possibility of rapidly determining an endurance limit from a self-heating test. Compression-compression fatigue and self-heating tests were carried out on a carbon/epoxy quasi-isotropic laminate with a stress ratio of 10. Fatigue tests were conducted for lifetimes up to 108 cycles. The damage scenario is investigated by interrupting fatigue tests and conducting subsequent observations of the samples using scanning electron microscopy and X-ray micro-computed tomography. A methodology for analyzing self-heating tests is applied, which allows the determination of the mean volumetric intrinsic cyclic dissipation of the laminate from surface thermal measurements. A method using a viscoelastic constitutive law is proposed to estimate the endurance limit from the self-heating curve.

中文翻译：

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准各向同性层合板的压缩-压缩疲劳：失效机制以及耗散行为与疲劳寿命之间的联系


很少有研究调查复合材料层合板在循环压缩载荷下的疲劳。此外，快速预测疲劳寿命的自热方法很少应用于此类材料。这项工作的目的是研究准各向同性层压板在压缩-压缩载荷下的疲劳，并评估从自热测试中快速确定耐久极限的可能性。在应力比为 10 的碳/环氧准各向同性层压板上进行了压缩-压缩疲劳和自热测试。疲劳测试的使用寿命长达 108 次循环。通过中断疲劳测试并使用扫描电子显微镜和 X 射线显微计算机断层扫描对样品进行后续观察来研究损伤情况。应用了一种分析自热测试的方法，该方法允许从表面热测量中确定层压板的平均体积内禀循环耗散。提出了一种使用粘弹性本构定律的方法，从自热曲线估计耐久极限。