CAJ | 학술논문

为了研究固体火箭发动机改性双基（CMDB）推进剂与三元乙丙（EPDM）包覆层界面的脱粘性能，通过双悬臂梁（DCB）试件和粘接件单轴拉伸试件对界面性能进行试验研究，获取了界面的内聚能和内聚强度。同时，引入双线性内聚力模型对界面层单元进行描述，建立了界面裂纹开裂扩展计算模型。模型仿真曲线与试验曲线一致性较好，表明所建内聚力模型能够反映界面力学特性。对试验与仿真过程中的裂纹面开裂扩展过程进行了比较分析，发现二者变化趋势基本一致，误差范围在12．5％以内，验证了界面模型在描述裂纹面扩展方面的可靠性。
위료연구고체화전발동궤개성쌍기（CMDB）추진제여삼원을병（EPDM）포복층계면적탈점성능，통과쌍현비량（DCB）시건화점접건단축랍신시건대계면성능진행시험연구，획취료계면적내취능화내취강도。동시，인입쌍선성내취력모형대계면층단원진행묘술，건립료계면렬문개렬확전계산모형。모형방진곡선여시험곡선일치성교호，표명소건내취력모형능구반영계면역학특성。대시험여방진과정중적렬문면개렬확전과정진행료비교분석，발현이자변화추세기본일치，오차범위재12．5％이내，험증료계면모형재묘술렬문면확전방면적가고성。
In order to investigate the debonding property of the interface between the CMDB propellant and EPDM inhibitor,an experiment was conducted by using the double cantilever beam(DCB)specimen and bonding uniaxial tensile specimen,the cohesive energy and cohesive strength were obtained. Meanwhile,the bilinear cohesive zone model was employed to describe the property of the interface elements,and a computing model for simulating the crack propagation was built by finite element method.The simula?tion curve and experiment curve were compared.The result shows that the model has a high precision and can characterize the me?chanical property of bonding interface well.The differences between the simulation and experiment of the crack propagation property were analyzed.It is found that the changing trends are accordant with each other and the tolerance is less than 12.5%,which certifi?cates that the model has a high reliability in describing the crack propagation property.