ANALYSIS ON CREEP DEFORMATION OF DEEP-SEA FULLY-TRANSPARENT PRESSURE-RESISTANT HULL
Polymethyl methacrylate(PMMA)is a kind of transparent polymer compound with good transparency,corrosion resistance,light weight,and excellent mechanical strength,which can be the candidate fully-transparent pressure-resistant hull material of submersibles.PMMA is a viscoelastic material,and when subjected to prolonged external high pressure,the pressure-resistant structure made of PMMA may undergo creep deformation,resulting in a decrease in its load-bearing capacity.In the present study,finite element analyses on the PMMA pressure-resistance hulls are conducted aiming at obtaining the creep deformation based on temperature-dependent time-hardening creep model from a series material tests.The creep properties of different types of spherical hulls without or with large openings are studied.And the strain-time curves and displacement curves of PMMA pressure-resistant hulls under varying pressures and temperatures are analyzed.The analysis results will provide reference for design of full-transparent manned cabin in deep-sea submersibles.
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维普
