CAJ | 학술논문

为了准确描述固体火箭发动机内三元乙丙( EPDM)绝热层在有限变形下的力学特性，主要通过多步松弛和单轴拉伸2种实验方法，获得平衡响应曲线和拉伸曲线。分别采用Ogden模型、Mooney-Rivlin模型，对平衡响应曲线进行拟合，并以此为基础，引入应变率参数μ来描述EPDM在单轴拉伸实验中的率相关特性，从而建立了EPDM在准静态单轴拉伸条件下的本构模型。研究结果表明，本文所建立的模型能很好地描述EPDM在准静态条件下的力学特性，通过该模型，也可在有限应变率范围内预测EPDM的应力响应特性。
위료준학묘술고체화전발동궤내삼원을병( EPDM)절열층재유한변형하적역학특성，주요통과다보송이화단축랍신2충실험방법，획득평형향응곡선화랍신곡선。분별채용Ogden모형、Mooney-Rivlin모형，대평형향응곡선진행의합，병이차위기출，인입응변솔삼수μ래묘술EPDM재단축랍신실험중적솔상관특성，종이건립료EPDM재준정태단축랍신조건하적본구모형。연구결과표명，본문소건립적모형능흔호지묘술EPDM재준정태조건하적역학특성，통과해모형，야가재유한응변솔범위내예측EPDM적응력향응특성。
To describe the mechanical property of EPDM insulation of solid rocket motor under finite deformation condition, e-quilibrium response curve and tensile curves were obtained by multi-step relaxation and uniaxial tensile tests. The article mainly a-dopts Ogden and Mooney-Rivlin strain energy function to characterize the equilibrium response curve, based on which, the parame-ter μ was introduced as a function of strain rates and strain which is sufficient to determine the rate effects of EPDM rubber under the uniaxial tension tests. The constitutive model can effectively characterize the mechanical property of EPDM under quasi-static loading. And in this way, the stress-strain behavior of EPDM can be predicted by the constitutive equation as long as the strain rates are in a limited range.