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<p>Polymethyl methacrylate (PMMA) has the advantages of good transparency, corrosion resistance and light weight and can be used as the preferred material for pressure-resistant cabins of fully transparent submersibles. In this study, based on the fracture mechanics method, a calculation method for estimating the residual fatigue life of a PMMA manned cabin is proposed by improving the small-time scale fatigue crack growth rate model. This improved model is verified by the experimental data of the PMMA material. Then, through the Weibull and Gumbel combined distribution functions, the fatigue load spectrum suitable for the fully transparent manned cabin is fitted according to the dive data. A parametric analysis of the residual fatigue life of the fully transparent manned cabin under various initial crack sizes and dwell time is conducted, yielding valuable results. This study aims to increase the safety of fully transparent pressure-resistant cabins and offer insights for fatigue analysis of underwater structures utilizing PMMA materials.</p>

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Residual Life Assessment of the PMMA Transparent Pressure-Resistant Cabin Based on an Improved Fatigue Crack Growth Model

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Zhi-hao He,
  • Fang Wang,
  • Oleg Gaidai,
  • Yu Wu,
  • Jin-fei Zhang,
  • Wen-xin Qu

摘要

Polymethyl methacrylate (PMMA) has the advantages of good transparency, corrosion resistance and light weight and can be used as the preferred material for pressure-resistant cabins of fully transparent submersibles. In this study, based on the fracture mechanics method, a calculation method for estimating the residual fatigue life of a PMMA manned cabin is proposed by improving the small-time scale fatigue crack growth rate model. This improved model is verified by the experimental data of the PMMA material. Then, through the Weibull and Gumbel combined distribution functions, the fatigue load spectrum suitable for the fully transparent manned cabin is fitted according to the dive data. A parametric analysis of the residual fatigue life of the fully transparent manned cabin under various initial crack sizes and dwell time is conducted, yielding valuable results. This study aims to increase the safety of fully transparent pressure-resistant cabins and offer insights for fatigue analysis of underwater structures utilizing PMMA materials.