三元乙丙橡胶薄膜黏接界面温度相关性力学性能

采用双悬臂夹层梁(DCSB)试件对三元乙丙橡胶(EPDM)薄膜黏接界面Ⅰ型断裂的温度相关性进行了研究;采用线弹性断裂力学(LEFM)方法获取了黏接界面断裂能,将其与单轴拉伸所得内聚强度作为双线性内聚力模型(CZM)参数,对不同温度条件下双悬臂夹层梁试件的Ⅰ型断裂行为进行了数值仿真.结果表明:仿真与实验曲线偏差较大,偏差出现的原因主要是未经修正的线弹性断裂力学方法所求断裂能存在较大的误差,需对其进行修正.调整模型参数使仿真曲线与实验曲线重合,获取了黏接界面的准确力学性能参数,采用此参数得到的仿真结果与实验结果具有较高的吻合度,证明了模型的可适用性.

Temperature dependent adhesive interfacial mechanical properties of EPDM film

The double cantilever sandwich beam(DCSB) specimen was used to study the temperature-dependent mode I fracture behavior of the interface between the ethylene propylene diene monomer(EPDM) films, the mode I fracture energy was determined by the linear elastic fracture mechanics(LEFM) method, then used simultaneously with the cohesive strength, which was obtained by uniaxial tension test as the parameter of a bilinear cohesive zone model(CZM) to simulate the fracture behavior of the DCSB specimen under different temperatures. Results showed that, there existed a large deviation between the test and simulation results, because the fracture energy determined by the uncorrected LEFM was not accurate. At last, by the means of adjusting the parameters of the CZM to make the simulation curves match the test curves better, the accurate mechanical property parameters were obtained, and the simulation result using these accurate properties matched well with test curve, proving the usability of this model to the fracture of the interface.