The International Thermonuclear Experimental Reactor (ITER) Toroidal Field (TF) coil case is made of austenitic stainless steel and is designed to operate at 4K. It is subject to fatigue due to pulsed loading cycles of a variety of magnitudes, along with less frequent TF charging loads, and periodic cool down cycles. Fatigue life estimation of such multiple lading becmes a critical issue in the TF structural design. The TF case stresses are computed in a large scale global model of the magnet system. Stress magnitudes vary in time and location around the case. ITER design critieria requires that a ful da/dN integral be carried out for a full simulation of all the charging and plasma shots. Paris Law integration and Miners's rule approaches are discussed in a companion paper by JUn Feng in this Conference. The Paris Law simulation is integrated into an ANSYS post process procedure that allows consideration of the spatial distribution of fatigue effects around the TF case. Peak stress, R values, life, and the factor of safety based on life (life divided by the required 100, 000 cycles) are output in a form that can be read back ANSYS and then contoured. Crack shape parameters, and crack position in the through thickness direction of the case wall may be considered. Results from the 1995-1996 evolution of the design show life estimates for the TF case side wall are near those set as a requirement for centered embedded cracks. Initial analyses of the present design (BDPA97) (4) show improved performance. Further work is needed in developing non destructive examination (NDE) procedures to reduce the size of the maximum un-detected near surface flaw.
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机译：国际热核实验反应器（浸泡）环形螺纹（TF）线圈壳由奥氏体不锈钢制成，设计成在4K处运行。由于多种幅度的脉冲装载循环，它受到疲劳的疲劳，并且具有较少频繁的TF充电载荷，并且周期性冷却循环。疲劳寿命估算这种多提单的临界问题在TF结构设计中。 TF壳体应力在磁体系统的大规模全局模型中计算。应力大小随着时间的时间和位置而变化。 ITER设计CRITIAIA要求进行充分模拟所有充电和等离子体镜头的FUL DA / DN积分。巴黎法律一体化和矿工的统治方法在本次会议上的司法纸上讨论了一个伴侣论文。巴黎法律仿真集成到ANSYS后处理程序中，允许考虑TF案例周围疲劳效果的空间分布。基于寿命的峰值应力，R值，寿命和安全系数（寿命除以所需的100,000个循环），以可以读取ANSYS然后轮廓的形式输出。可以考虑裂缝形状参数，并且可以考虑壳体壁的贯穿壳体厚度方向的裂缝位置。 1995 - 1996年设计的演变结果显示了TF壳体侧壁的寿命估计靠近那些作为居中嵌入式裂缝的要求。本设计的初始分析（BDPA97）（4）显示出改善的性能。在开发非破坏性检查（NDE）程序方面需要进一步的工作，以减少近地表缺陷附近的最大未检测到的大小。
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