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An accelerated creep test method for deep-sea equipment viewport window was proposed in this paper based on the sensitivity of PMMA (Polymethyl methacrylate) to temperature and stress. A modified creep constitutive equation based on aging theory was proposed by introducing the influence function of temperature. The uniaxial compressive creep tests at different temperature and stress levels were carried out, and the creep constitutive relation of PMMA was obtained by stepwise fitting method. The conversion relationship of the creep behavior of the viewport under different temperatures and pressures was obtained by the finite element creep analysis. The accelerated creep test method of the viewport model under the condition of raised temperature and increased pressure was proposed, and the comparison between the test results and the calculated results was completed. It is shown that the stress sensitivity of the uniaxial compressive creep behavior of PMMA is related to temperature. The finite element solution of the conversion coefficient of viewport’s creep deformation under different temperatures and pressures is different from the calculated value. The results of the viewport model are in good agreement with those of finite element creep analysis. In conclusion, in a certain temperature and stress range, the creep constitutive relation of PMMA obtained in this paper can well describe the law of uniaxial compressive creep behavior, and that of the viewport can be well simulated by the finite element creep analysis. The calculation results show that the conversion coefficient of viewport’s creep displacements between conditions of 25 °C & 26.6 MPa and 3 °C & 20 MPa is 12.2, and this coefficient can provide a basis for the accelerated creep test.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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