Stress relaxation and structural performance analysis of conical viewport for deep-sea submersible

Du, Qinghai; Lei, Qi; Liu, Fengyou; Liu, Wei; Liu, Weilong

doi:10.1016/j.oceaneng.2024.116837

Cited by 1 publication

(1 citation statement)

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“…Li et al [15] proposed an evaluation method of stress accumulation and recovery of observation windows based on polarization imaging, which can provide new possibilities for stress detection of observation windows. Du et al [16] analyzed the relaxation behavior of a multi-parameter PMMA observation window through an improved stress relaxation model and found that the numerical calculation outcomes closely aligned with experimental findings. Using the temperature dependent time-hardening creep model, He et al [17] carried out a series of finite element analyses on the observation window, offering a method for analyzing and designing the window's creep behavior.…”

Section: Introductionmentioning

confidence: 77%

Life Assessment of Deep-Sea Observation Windows under Different Design Considerations

He,

Wang,

Zhang

et al. 2024

JMSE

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As a key component of deep-sea manned submersibles, the observation window is usually constructed with polymethyl methacrylate (PMMA) material. During the design of the observation windows, the consideration of actual lifespan and its influential factors is insufficient. There are no clear provisions in the widely applied specifications. In this paper, based on the continuum damage mechanics model, combined with the viscoelastic relationship of PMMA material, a series of calculations were performed on the PMMA observation window. The parametric analysis of the fatigue crack-initiation life of the observation window at various thickness-to-diameter ratios (1.6, 1.4, 1.2, and 1.0), different friction coefficients (0.1, 0.2, and 0.3), and different transition arc radii (4000 mm and 6000 mm) was carried out. The calculated crack positions in the numerical mode used for validation closely align with those in the tested window. And simulation results show that the fatigue life of the observation window gradually decreases with the decrease in the thickness–diameter ratio and the increase in the friction coefficient. However, the increase in the transition arc radius will prolong the fatigue life of the observation window, which is higher than that of the original structure.

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Section: Introductionmentioning

confidence: 77%