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<p>It was crucial to determine the effect of low-temperature fatigue damage on aluminum plate-fin structures (APS) for the safe operation of aluminum plate-fin heat exchangers (APHEs) for liquefied natural gas (LNG). However, the fatigue characteristics of APS were unclear under low-temperature condition. This resulted in an inability to accurately assess the effect of low-temperature fatigue damage on APS. To solve this problem, the fatigue mechanism was obtained for APS under low-temperature condition (77&#xa0;K) based on fracture mechanics. The core idea of this mechanism was to analyze the effect of low-temperature fatigue damage on APS in conjunction with fatigue characteristics of APS under normal condition (296&#xa0;K). The results indicated there were some differences and commonalities between the fatigue characteristics of APS under normal and low-temperature conditions. Specifically, the fatigue fracture mode of APS belonged to the quasi-cleavage fatigue fracture. The structural strength of fins was the key factor affecting fatigue fracture for APS under low-temperature condition. Meanwhile, there was no significant difference in the position of fatigue sources inside APS located at the edge of the fins root when APHEs temperature changed. This research provided valuable suggestions to strengthen the structural strength and improve the fatigue life of APHEs for LNG.</p>

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Investigation of Fatigue Characteristics and Mechanism of LNG Plate-Fin Structure under Low-Temperature Condition

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Shengxun Wang,
  • Huilun Kang,
  • Hongqiang Ma,
  • Peng Zhong,
  • Yue Xie,
  • Jiajun Wang,
  • Ruixiang Ding

摘要

It was crucial to determine the effect of low-temperature fatigue damage on aluminum plate-fin structures (APS) for the safe operation of aluminum plate-fin heat exchangers (APHEs) for liquefied natural gas (LNG). However, the fatigue characteristics of APS were unclear under low-temperature condition. This resulted in an inability to accurately assess the effect of low-temperature fatigue damage on APS. To solve this problem, the fatigue mechanism was obtained for APS under low-temperature condition (77 K) based on fracture mechanics. The core idea of this mechanism was to analyze the effect of low-temperature fatigue damage on APS in conjunction with fatigue characteristics of APS under normal condition (296 K). The results indicated there were some differences and commonalities between the fatigue characteristics of APS under normal and low-temperature conditions. Specifically, the fatigue fracture mode of APS belonged to the quasi-cleavage fatigue fracture. The structural strength of fins was the key factor affecting fatigue fracture for APS under low-temperature condition. Meanwhile, there was no significant difference in the position of fatigue sources inside APS located at the edge of the fins root when APHEs temperature changed. This research provided valuable suggestions to strengthen the structural strength and improve the fatigue life of APHEs for LNG.