摘要
胶接是常见于轻量化车身制造的连接方式,胶接接头的失效行为建模是轻量化车身碰撞安全设计的重要前提。针对高韧性环氧基结构胶,该文选择了一种考虑应力状态、应变率效应和损伤累积的弹塑性本构模型表征其复杂冲击力学响应,以提高胶接接头失效模型的准确性。围绕此本构模型,开发了便于实施的模型参数识别方法和标定流程,建立了针对两种环氧基结构胶的材料模型。通过开展胶材本体、胶接接头及胶接结构等多层级冲击破坏实验与对应有限元仿真,验证了所选用的胶粘剂材料模型和胶接接头表征方法的可靠性。
Adhesive connection is a traditional connecting technique in the manufacturing of lightweight bodies of vehicles.The modeling of adhesive joints is a crucial precondition for the crash safety design of lightweight vehicles.To fully capture the mechanical response of epoxy-based structural adhesive with high tenacity and improve the accuracy of existing models of joint failure under impact loading,a constitutive model that considers the stress state effect,strain rate effect,and damage accumulation simultaneously is introduced in this study.Based on the constitutive model,this paper presents a method to recognize the model parameters and a corresponding parameter calibration process.Then,two material models for different epoxy-based adhesives are established.The constitutive model and characterization approach introduced in this study are verified through a result comparison between FE simulations and multi-level impact tests.The bulk specimen tests,adhesive joints tests,and structural impact tests are included in this study.
作者
应鹏飞
葛宇龙
赵天琪
夏勇
YING Peng-fei;GE Yu-long;ZHAO Tian-qi;XIA Yong(State Key Laboratory of Automotive Safety and Energy,Tsinghua University,Beijing 100084,China)
出处
《工程力学》
EI
CSCD
北大核心
2023年第9期224-237,共14页
Engineering Mechanics
关键词
胶接接头
冲击响应
有限元模型
损伤累积
内聚失效
adhesive joints
impact response
finite element model
damage accumulation
cohesive failure
