基于热弹性温度变化的非连续碳纤维增强聚合物复合材料疲劳损伤评价

IF 1.9 4区 工程技术 Q3 ENGINEERING, MECHANICAL
A. Akai, Y. Sato, Y. Hamada, A. Mikuni
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引用次数: 0

摘要

碳纤维增强聚合物(CFRP)复合材料预计将越来越多地用于汽车结构,以实现汽车重量减轻,从而有效减少二氧化碳排放。对CFRP复合材料进行疲劳损伤评价是保证其长期使用的必要条件。在基于热成像的方法中,应该阐明一个合适的温度分量来评估不连续CFRP复合材料的疲劳损伤-不连续纤维的CFRP复合材料。本研究采用通过热弹性温度变化测量得到的无量纲热弹性温度幅值。这个振幅可以用来评估材料在循环加载下的应力状态。此外,研究了碳纤维薄板成型复合材料(C-SMC)的无量纲热弹性温度幅值与疲劳损伤之间的关系。C-SMC是一种通过薄板成型复合方法生产的不连续碳纤维增强复合材料。实验结果表明,无量纲热弹性温度幅值的减小与疲劳损伤有关。这种减少归因于两个因素。一种是随着疲劳损伤的进展,纤维的主导取向发生了变化,从而导致纤维纵向和横向上施加的应力状态发生了变化。二是纤维纵向和横向热膨胀系数的差异。从而证实了利用无因次热弹性温度幅值监测疲劳损伤演变的可能性。未来的研究应该利用热弹性温度变化来评估CFRP复合材料的剩余疲劳寿命。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fatigue Damage Evaluation of Discontinuous Carbon Fiber-Reinforced Polymer Composites Using Thermoelastic Temperature Variations

Fatigue Damage Evaluation of Discontinuous Carbon Fiber-Reinforced Polymer Composites Using Thermoelastic Temperature Variations

Carbon fiber-reinforced polymer (CFRP) composites are expected to be increasingly adopted in automotive structures to achieve car weight reductions that yield an effective reduction of carbon dioxide emissions. Fatigue damage evaluation of CFRP composites is indispensable to guarantee their long-term use. In a thermography-based approach, a suitable temperature component to evaluate the fatigue damage of discontinuous CFRP composites—CFRP composites of discontinuous fibers—should be elucidated. In this study, the non-dimensional thermoelastic temperature amplitude, obtained through thermoelastic temperature variation measurements, is employed. This amplitude can be used to evaluate the stress state of a material subjected to cyclic loading. Moreover, the relationship between the non-dimensional thermoelastic temperature amplitude and fatigue damage is investigated under tension–tension cyclic loading for carbon fiber sheet molding compound (C-SMC), which is a discontinuous CFRP composite produced via sheet molding compound methods. Experimental results reveal that a decrease in the non-dimensional thermoelastic temperature amplitude is associated with the fatigue damage. This decrease is attributed to two factors. One is a change in the stress state applied in the longitudinal and transverse directions of the fiber caused by a shift in the dominant fiber orientation as fatigue damage progresses. The other is the difference in the thermal expansion coefficients in the longitudinal and transverse directions of the fiber. Therefore, the possibility of monitoring the fatigue damage evolution using the non-dimensional thermoelastic temperature amplitude is confirmed. Future studies should assess the remaining fatigue life of CFRP composites using thermoelastic temperature variations.

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来源期刊
Experimental Techniques
Experimental Techniques 工程技术-材料科学:表征与测试
CiteScore
3.50
自引率
6.20%
发文量
88
审稿时长
5.2 months
期刊介绍: Experimental Techniques is a bimonthly interdisciplinary publication of the Society for Experimental Mechanics focusing on the development, application and tutorial of experimental mechanics techniques. The purpose for Experimental Techniques is to promote pedagogical, technical and practical advancements in experimental mechanics while supporting the Society''s mission and commitment to interdisciplinary application, research and development, education, and active promotion of experimental methods to: - Increase the knowledge of physical phenomena - Further the understanding of the behavior of materials, structures, and systems - Provide the necessary physical observations necessary to improve and assess new analytical and computational approaches.
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