ITER环氧基复合材料轴向绝缘子的低温气密性能研究  

Simulation of Cryogenic Sealing of Epoxy-Resin Based Axial Insulation Breaks for International Thermonuclear Experimental Reactor

作　　者：杨长春[1] 潘皖江[2] 

机构地区：[1]九江学院电子工程学院,九江332005 [2]中国科学院等离子物理研究所,合肥230031

出　　处：《真空科学与技术学报》2014年第12期1405-1409,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家青年科学基金项目(51107138)

摘　　要：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。The cryogenic sealing performance of the axial insulation brakes, made of glass-fiber reinforced plastic （GFRP） composite material for International Thermonuclear Experimental Reactor （1TER）, was empirically approximated, mathematically modeled, and numerically simulated software ANSYS, and experimentally evaluated. The influence of the sealing conditions, including but not limited to the low temperature, pressure, tensile loads, thermal and mechanical shocks, on its air-tightness （leakage rate） was investigated. The simulated results show that the thermal stress at the insulator/metal interface strongly affects the leakage rate because of a large mismatch in thermal expansion coefficients of metal and GFRP. Tested at 4 MPa of helium, under 2000 N shock loads of tension and compression, and for 25 thermal cycles from 77 to 300 K,the leakage rate of the insulation break was measured to be 1.0 × 10^-9 Pa· m^3/s. The simulated and tested results indicate that the leakage rate meets the stringent requirements of ITER axial insulation breaks.

关 键 词：国际热核聚变实验装置 轴向绝缘子 热应力分析 低温 气密性 

分 类 号：TM216[一般工业技术—材料科学与工程]