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三元乙丙(Ethylene Propylene Diene Monomer,即EPDM)材料的力学性能对使用其作为包覆层的固体火箭发动机起到关键的作用。利用万能试验机进行EPDM包覆层材料常温下的准静态压缩实验,通过实验发现,EPDM包覆层材料具有明显的超弹特性和率敏感特性。提出采用超弹模型来描述材料压缩变形下的力学性能,通过比较Mooney-Rivlin模型、Ogden模型和Polynomial模型的拟合结果,发现二阶Polynomial超弹模型的精度最高,故选取Polynomial超弹模型作为EPDM包覆层材料的本构模型,并考虑其率相关特性,拟合超弹及率相关两部分的材料参数。对比实验结果,发现压缩模型能很好地预测40%应变内的EPDM材料的力学性能。
The mechanical properties of Ethylene Propylene Diene Monomer (EPDM) materials play a key role in the use of their solid rocket motors as coatings. The quasi-static compression experiment of EPDM cladding material at room temperature was carried out by using a universal testing machine. It was found through experiment that the EPDM cladding material has obvious super-elastic properties and rate-sensitive properties. The super elastic model is proposed to describe the mechanical properties under compressive deformation. By comparing the fitting results of Mooney-Rivlin model, Ogden model and Polynomial model, it is found that the accuracy of the second-order Polynomial hypersound model is the highest. Therefore, the Polynomial super- EPDM cladding material constitutive model, and consider its rate-related properties, fitting super-elastic and rate-related two parts of the material parameters. Comparing the experimental results, it is found that the compression model can predict the mechanical properties of EPDM material within 40% strain well.