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为研究三元乙丙(EPDM)包覆层材料热解过程及其热解后的力学行为,采用热重分析(TGA)对EPDM的热稳定性进行分析,基于其TGA曲线与热降解温度,通过电阻炉设定不同的温度进行热解实验,然后利用万能实验机完成准静态单轴压缩实验.结果表明:EPDM材料的抗压性能随着热解温度的升高呈先减小再升高而后降低的趋势,可大体分为3个阶段.通过分阶段建立模型来更好地描述材料不同热解程度下的力学行为,采用2阶Polynomial超弹模型与温度相关项相结合等方式预测不同温度热解后EPDM材料的力学响应,对比实验结果发现模型拟合精度良好.
In order to study the pyrolysis process of EPDM coating material and its mechanical behavior after pyrolysis, the thermal stability of EPDM was analyzed by thermogravimetric analysis (TGA). Based on its TGA curve and thermal degradation temperature, The pyrolysis experiments were carried out by setting different temperatures in the resistance furnace, and then the quasi-static uniaxial compression tests were completed by a universal testing machine.The results showed that the compressive properties of EPDM materials decreased firstly and then increased and then decreased with the increase of pyrolysis temperature The trend can be roughly divided into three stages.Through a phased modeling to better describe the mechanical behavior of materials under different degrees of pyrolysis, the use of second-order Polynomial superelastic model and the combination of temperature-related terms such as prediction of different temperature heat After solving the mechanical response of EPDM material, the experimental results show that the model fitting accuracy is good.