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论文:2023,Vol:41,Issue(3):455-463 |
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引用本文： |
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董佳晨, 杨智勇, 郑锡涛, 宋明宇, 闫雷雷. 螺栓拧紧力矩对复合材料多钉连接结构疲劳寿命的影响[J]. 西北工业大学学报 |
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DONG Jiachen, YANG Zhiyong, ZHENG Xitao, SONG Mingyu, YAN Leilei. Effect of bolt tightening torque on fatigue life of multi-bolted composite structure[J]. Journal of Northwestern Polytechnical University |
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| 螺栓拧紧力矩对复合材料多钉连接结构疲劳寿命的影响 |
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| 董佳晨1,2, 杨智勇3, 郑锡涛1,2, 宋明宇1,2, 闫雷雷1,2 |
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1. 西北工业大学 航空学院, 陕西 西安 710072;
2. 西北工业大学 飞行器复合材料结构研究所, 陕西 西安 710072;
3. 中国运载火箭技术研究院 航天材料及工艺研究所, 北京 100076 |
| 摘要: |
| 螺栓拧紧力矩对多钉连接结构疲劳寿命的影响不可忽视，但考虑螺栓拧紧力矩的复合材料多钉连接结构疲劳寿命预测方法却很少，提出一种复合材料多钉连接结构疲劳寿命预测方法，综合考虑螺栓与层合板的各种损伤情况，可以准确预测复合材料多钉连接结构的疲劳寿命以及损伤演化情况。采用T300/BMP-316复合材料层合板与TC4钛合金螺栓组成的复合材料多钉连接结构对所提方法进行了验证，疲劳寿命预测结果与试验值对数误差为4.36%，且破坏模式与试验结果吻合。通过对螺栓拧紧力矩的影响规律进行探究，发现随着螺栓拧紧力矩的增加，疲劳寿命先增加后减小，存在最佳拧紧力矩。从损伤演化云图中发现当拧紧力矩小于最佳拧紧力矩时，损伤扩展不能得到有效抑制，会导致疲劳寿命降低；反之当拧紧力矩大于最佳拧紧力矩时，试验件会形成初始损伤，导致疲劳寿命降低。在工程应用中，选择结构的最佳拧紧力矩进行装配，可以有效提高结构疲劳寿命。 |
| 关键词:
复合材料
多钉连接结构
疲劳损伤模拟
疲劳寿命预测
拧紧力矩
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| Effect of bolt tightening torque on fatigue life of multi-bolted composite structure |
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| DONG Jiachen1,2, YANG Zhiyong3, ZHENG Xitao1,2, SONG Mingyu1,2, YAN Leilei1,2 |
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1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. Institute of Aircraft Composite Structures, Northwestern Polytechnical University, Xi'an 710072, China;
3. Aerospace Research Institute of Materials and Processing Technology, China Academy of Launch Vehicle Technology, Beijing 100076, China |
| Abstract: |
| Bolt tightening torque has an influence on the fatigue life of the multi-bolted joints which cannot be ignored, but there are few methods to predict the fatigue life of the multi-bolted composite structure by considering the bolt tightening torque. A fatigue life prediction method of the multi-bolted composite structure by considering the bolt tightening torque is proposed. It can take into account the various damages of bolts and laminates and accurately calculate fatigue life and damage evolution of multi-bolted composite structure. The multi-bolted composite structure being composed of T300/BMP-316 composite laminates and TC4 titanium alloy bolts is used to verify the present method. The logarithmic error between the predicted fatigue life and the experimental is 4.36%, and the failure mode is consistent with the experimental. Through the present method, the influence of the bolt tightening torque is explored, in which it is found that with the increasing of bolt tightening torque, the fatigue life increases firstly and decreases, and there is an optimal tightening torque. By observing the damage evolution diagram, it is found that when the tightening torque is below the optimal tightening torque, the damage propagation cannot be effectively restrained, which will lead to the reduction of fatigue life. On the contrary, when the tightening torque is more than the optimal tightening torque, it will cause the initial damage to the test piece, which will also lead to the reduction of fatigue life. In engineering, to choose the best tightening torque of the structure for assembly can effectively improve the fatigue life of the structure. |
| Key words:
composite
multi-bolted structure
fatigue damage simulation
fatigue life prediction
tightening torque
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| 收稿日期: 2022-07-28
修回日期:
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| DOI: 10.1051/jnwpu/20234130455 |
| 基金项目: 国防基础科学研究计划（JCKY2019283-WSZC006）资助 |
| 通讯作者: 闫雷雷(1985—),西北工业大学副教授,主要从事结构轻量化及多功能一体化设计与表征研究。e-mail:yanleilei@nwpu.edu.cn
Email：yanleilei@nwpu.edu.cn |
| 作者简介: 董佳晨(1999—),西北工业大学硕士研究生,主要从事复合材料疲劳寿命预测研究。
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