摘要
为研究编织型复合材料胶螺混合连接接头的力学性能,构建基于三维渐进损伤模型和内聚力模型的胶螺混合连接接头力学失效模型,模拟连接接头的力学行为与损伤演化。基于Abaqus有限元软件,建立编织型复合材料胶螺混合连接有限元仿真模型,通过三维Linde准则判断复合材料的损伤萌生与扩展,采用内聚力模型模拟胶层的损伤失效过程,在试验验证模型准确性的基础上,分析不同拧紧力矩下连接结构强度和损伤失效过程。试验结果与仿真模拟结果表明,随着拧紧力矩的增加,胶层损伤扩展得到有效抑制,而胶螺混合连接结构的胶层剪切强度先增加后减小。这是因为增大拧紧力矩可以减小连接结构中胶层的剥离应力,但过大的拧紧力矩会增大胶层孔周应力,导致胶层剪切强度减小,降低了连接结构的强度。数值模拟的载荷-位移曲线与试验结果吻合,所预测的胶层断裂载荷与试验结果相当;同时层合板上的纤维损伤、基体损伤以及分层损伤在数值模型中也能很好地体现,与连接件试验后的损伤形式相近,验证了损伤预测模型的有效性。
To investigate the mechanical properties of woven composite hybrid bonded/bolted joints,a mechanical failure model for hybrid bonded/bolted joints based on 3D progressive damage model and cohesive force model was developed to simulate the mechanical behavior and damage evolution of the joints.Based on the Abaqus finite element software,a finite element simulation model for hybrid bonded/bolted joints woven composites was established.The damage initiation and propagation of the composite material were judged using the three-dimensional Linde criterion.The cohesive force model was used to simulate the damage failure process of the adhesive layer.On the basis of test verification of the model accuracy,the strength and damage failure process of the joints were analyzed under different tightening torques.The test and simulation results indicate that as the tightening torque increases,the extension of adhesive layer damage can be effectively suppressed.However,the shear strength of the adhesive layer in the hybrid bonded/bolted joints firstly increases and then decreases,because increasing the tightening torque can reduce the peeling stress of the adhesive layer in the joints.However,the excessive tightening torque will strengthen the stress around the adhesive layer hole,leading to a decrease in the shear srength of the adhesive layer and a decrease in the strength of the connection structure.The load-displacement curve of the numerical simulation is consistent with the test results,and the predicted adhesive layer fracture load is equivalent to the test results.At the same time,the fiber damage,matrix damage,and delamination damage on the laminated plate can also be well reflected in the numerical model,which is similar to the damage form after the connection test,verifying the effectiveness of the damage prediction model.
作者
沈金屹
胡卫鑫
张天宇
胡俊山
廖文和
田威
沈烨
SHEN Jinyi;HU Weixin;ZHANG Tianyu;HU Junshan;LIAO Wenhe;TIAN Wei;SHEN Ye(College of Mechanical&Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;AVIC Xi’an Aircraft Industry Group Company Ltd.,Xi’an 710089,China;School of Mechanical Engineering,Nanjing University of Science&Technology,Nanjing 210094,China;Shanghai Aerospace Electronic Technology Research Institute,Shanghai 201109,China)
出处
《机械强度》
北大核心
2025年第7期24-32,共9页
Journal of Mechanical Strength
基金
安徽省重点研发计划项目(202203a05020039)
中国博士后科学基金项目(2022M720939)
江苏省自然科学基金项目(BK20231444)
国家自然科学基金项目(52005259)。
关键词
复合材料
胶螺混合连接
有限元分析
胶层剪切强度
损伤演化
Composite material
Hybrid bonded/bolted joint
Finite element analysis
Shear strength of adhesive layer
Damage evolution
