{"title":"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","authors":"A. Akai, Y. Sato, Y. Hamada, A. Mikuni","doi":"10.1007/s40799-024-00766-1","DOIUrl":null,"url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"49 4","pages":"609 - 621"},"PeriodicalIF":1.9000,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Fatigue Damage Evaluation of Discontinuous Carbon Fiber-Reinforced Polymer Composites Using Thermoelastic Temperature Variations\",\"authors\":\"A. Akai, Y. Sato, Y. Hamada, A. Mikuni\",\"doi\":\"10.1007/s40799-024-00766-1\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>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.</p></div>\",\"PeriodicalId\":553,\"journal\":{\"name\":\"Experimental Techniques\",\"volume\":\"49 4\",\"pages\":\"609 - 621\"},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2024-12-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Experimental Techniques\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s40799-024-00766-1\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experimental Techniques","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s40799-024-00766-1","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
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.
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.