薛茜薇, 杜晓渊, 郭鑫, 程羽佳, 程小全. 沉头螺接复合材料接头失效预测强度包线法[J]. 工程力学, 2024, 41(9): 214-224. DOI: 10.6052/j.issn.1000-4750.2022.07.0609
引用本文: 薛茜薇, 杜晓渊, 郭鑫, 程羽佳, 程小全. 沉头螺接复合材料接头失效预测强度包线法[J]. 工程力学, 2024, 41(9): 214-224. DOI: 10.6052/j.issn.1000-4750.2022.07.0609
XUE Qian-wei, DU Xiao-yuan, GUO Xin, CHENG Yu-jia, CHENG Xiao-quan. A FAILURE ENVELOPE METHOD FOR FAILURE PREDICTION OF COUNTERSUNK BOLTED COMPOSITE JOINTS[J]. Engineering Mechanics, 2024, 41(9): 214-224. DOI: 10.6052/j.issn.1000-4750.2022.07.0609
Citation: XUE Qian-wei, DU Xiao-yuan, GUO Xin, CHENG Yu-jia, CHENG Xiao-quan. A FAILURE ENVELOPE METHOD FOR FAILURE PREDICTION OF COUNTERSUNK BOLTED COMPOSITE JOINTS[J]. Engineering Mechanics, 2024, 41(9): 214-224. DOI: 10.6052/j.issn.1000-4750.2022.07.0609

沉头螺接复合材料接头失效预测强度包线法

A FAILURE ENVELOPE METHOD FOR FAILURE PREDICTION OF COUNTERSUNK BOLTED COMPOSITE JOINTS

  • 摘要: 多钉连接复合材料接头设计分析中,常用强度包线来预测其强度与失效模式。目前所使用的强度包线法只适用于凸头螺接结构,无法应用于沉头螺接结构。该文建立了带衬套沉头螺接复合材料接头有限元模型,对3钉连接结构进行了拉伸性能分析,并通过试验结果验证了模型的有效性,然后用该模型对衬套的作用进行了研究。在此基础上,提出了适用于沉头螺栓复合材料连接结构强度和失效模式预测的强度包线法。结果表明:使用衬套比仅采用螺杆过盈装配能够明显减慢孔边损伤扩展速率,避免接头各钉载的比例在拉伸过程中剧烈变化;引入衬套能提高接头的承载能力和刚度,其2%偏移载荷、极限载荷和刚度比不带衬套接头分别提高了14.08%、5.21%和6.04%。通过计算少量单钉螺接接头的损伤情况,便可以绘制出相应参数多钉连接结构的新型强度包线。利用新型强度包线,能准确预测沉头和凸头螺接接头的强度和失效模式。

     

    Abstract: Failure envelope is usually employed to assess the strength and failure modes of multi-bolt jointed composite structures in engineering design and analysis. The current failure envelope method is only applicable to convex head bolt jointed structures, but not applicable to countersunk head bolt jointed structures. A finite element model of the countersunk head bolt jointed composite structure with sleeves was established. The tensile properties of the 3-bolt joint were analyzed, and the model was verified against test results. The effect of the sleeve was studied with this model. On this basis, the failure envelope method is proposed to predict the strength and failure mode of countersunk head bolt jointed composite structures. The results show that the sleeves can significantly slow down the expansion of hole edge damage and prevent violent variation of the joint bolt load ratio in tensile process, compared with bolt interference assembly only. The introduction of sleeves improves load carrying capacity and stiffness of the joint. The 2% off-set load, ultimate load and stiffness of the joint with sleeves are 14.08%, 5.21% and 6.04% greater than those of the joint without sleeves, respectively. By examining a small number of single bolt joints, the new failure envelope of multi-bolt jointed structure with corresponding design parameters can be drown, which can be used to predict the strength and failure mode of countersunk and convex head bolt jointed composite structures.

     

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