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采用ANSYS软件对国际热核聚变实验装置(ITER)环氧基复合材料轴向绝缘子在低温、内气压、拉伸载荷作用下的热应力进行有限元分析,并且对低温冲击、内气压冲击和拉伸压缩应力冲击性能进行实验测试。分析和实验结果表明:由于绝缘子的绝缘体与金属导体的热膨胀系数不同,由常温降到液氦温度时界面热应力是影响绝缘子气密性能的主要因素;在室温到液氮冷热循环25次后,承受4 MPa氦气内压,2000 N拉压载荷下气密性保持好于1.0×10-9Pa·m3/s,能够满足ITER轴向绝缘子的技术要求。
ANSYS software is used to carry out the finite element analysis of thermal stress of ITER epoxy insulators under low temperature, internal pressure and tensile load, and the influence of low temperature impact, internal pressure impact and pull Tensile compressive stress impact performance of the experimental test. The analysis and experimental results show that the thermal stress at the interface decreases from room temperature to liquid helium, which is the main factor that affects the airtightness of the insulator due to the different thermal expansion coefficient between insulator and metal conductor. After room temperature to 25 , Withstand 4 MPa helium internal pressure, 2000 N Tension and Compression load to maintain better than 1.0 × 10-9Pa · m3 / s, to meet the technical requirements ITER axial insulators.