多场耦合作用下的CFRP干涉连接结构损伤演化机理及寿命预测方法

项目名称： 多场耦合作用下的CFRP干涉连接结构损伤演化机理及寿命预测方法

项目编号： No.51305349

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 刘平

作者单位： 西北工业大学

项目金额： 25万元

中文摘要： CFRP结构件以其高强度、高模量等优异特性广泛应用于航空航天领域，其失效部位主要集中在连接界面。虽然干涉连接能有效提高界面的抗疲劳和连续密封性能，但连接过程产生的损伤和残余应力等问题，严重影响到干涉连接结构的服役的安全性和可靠性。因此，本项目以CFRP干涉连接结构为对象，结合理论探索、实验研究和计算仿真，开展多场耦合作用下的CFRP干涉连接结构损伤演化和寿命预测方法研究，通过探索残余应力场、温度场、动态载荷应力场影响下的CFRP微损伤扩展机理，建立宏/细观统一的损伤演化本构模型和损伤累积模型，形成服役状态下的CFRP干涉连接结构危险区域预测方法和疲劳寿命预测方法，为CFRP干涉连接结构件在航天领域更加安全、可靠服役的设计制造决策提供可靠的基础理论与依据。

中文关键词： 碳纤维增强复合材料；干涉连接；应力分布；损伤分析；疲劳寿命

英文摘要： For the character of high strength and high modulus, CFRP structure is widely used in the field of aviation and aerospace more and more widely, which failure part mainly focuses on the joint interfaces. The application of interference-fit can improve continuous sealing and anti-fatigue properties. However, the problems brought by joining process, for example the damage and the residual stress, seriously damage the health service state of the CFRP structure. Therefore, this project, taking CFRP interference-fit structure as the object, carries out damage evolutionary mechanism and fatigue-life prediction method with multi-field coupling. Under the influence of residual stress, temperature, and dynamic load, propagation mechanism microscopic damage are explored, and macro/microscopic unified the damage evolution constitutive model and damage accumulation model are established. All above will provide the method of predict danger area and fatigue life of the structure on service state. The research findings of this project has remarkable scientific significance and widely useful value to support the safely and reliably application of CFRP interference-fit structures in the field of aviation and aerospace.

英文关键词： CFRP；interference fit joints；stress distribution；damage analysis；Fatigue life