In this study, fatigue life assessment was conducted on a KC-1 membrane, considering cryogenic operation temperature, effect of stamping, and very long service period. KC-1 membranes are produced through a process of stamping, and they make direct contact with LNG filled within a containment system at − 162 °C. The high waves that LNG carriers encounter during sailing, and even when at anchor, cause rolling motions of the hull, which result in resonant fluid motions that generate a sloshing phenomenon; such sloshing motions expose containment systems to a high level of repeated stress. To assess the very high cycle fatigue (VHCF) life of the membrane, the effects of plastic deformation and the mechanical properties of STS304L, a membrane material, were examined at cryogenic temperatures. To identify the effects of plastic deformation and cryogenic temperatures on their mechanical properties, tensile and VHCF tests were conducted at cryogenic temperatures on a sheet to which plastic strain was applied through cold-rolling. Through forming analysis, changes in the thickness and plastic strain of a membrane caused during the process of stamping were examined. The results of earlier studies that performed flow analysis and fluid–structure interaction analysis to measure the stress applied to each component of the KC-1 containment system were cited, and the VHCF life of the membrane was assessed based on the surveyed mechanical properties, and the results of forming analysis.

在这项研究中，考虑到低温操作温度，冲压效果和非常长的使用寿命，对KC-1膜进行了疲劳寿命评估。KC-1膜是通过冲压工艺生产的，它们与-162°C的密闭系统中填充的LNG直接接触。液化天然气运输船在航行过程中甚至在锚泊时遇到的高波也会引起船体的滚动运动，从而导致共振的流体运动，从而产生晃动现象。这样的晃动使安全壳系统承受高水平的重复应力。为了评估膜的极高循环疲劳（VHCF）寿命，在低温下检查了膜材料STS304L的塑性变形和机械性能的影响。为了确定塑性变形和低温温度对其机械性能的影响，在低温下对通过冷轧对其施加了塑性应变的板材进行了拉伸和VHCF测试。通过成形分析，检查了在冲压过程中引起的膜的厚度和塑性应变的变化。引用了进行流动分析和流固耦合分析以测量施加到KC-1密闭系统每个组件上的应力的早期研究的结果，并根据调查的机械性能评估了膜的VHCF寿命，并且成形分析的结果。在低温下对通过冷轧对其施加了塑性应变的板材进行了拉伸和VHCF测试。通过成形分析，检查了在冲压过程中引起的膜的厚度和塑性应变的变化。引用了进行流动分析和流固耦合分析以测量施加到KC-1密闭系统每个组件上的应力的早期研究的结果，并根据调查的机械性能评估了膜的VHCF寿命，并且成形分析的结果。在低温下对通过冷轧对其施加了塑性应变的板材进行了拉伸和VHCF测试。通过成形分析，检查了在冲压过程中引起的膜的厚度和塑性应变的变化。引用了进行流动分析和流固耦合分析以测量施加到KC-1密闭系统每个组件上的应力的早期研究的结果，并根据调查的机械性能评估了膜的VHCF寿命，并且成形分析的结果。