超高压深海环境下多结构并行疲劳试验技术研究

针对全海深载人潜水器2只载人舱缩比球壳模型的疲劳试验,通过理论方法对比分析了压差法与外压单独作用下球壳的应力状态,验证了超高压深海环境下内外压差法模拟球壳作业环境的可行性。同时,为降低球壳外部交变载荷对试验设备的损伤,并有效缩短试验时长,提出一种计及超高压深海环境下采用内外压差法开展的多结构并行疲劳试验技术。根据该试验技术进行了近7 000个循环周期的双球串联疲劳试验,有力地保证了全海深载人潜水器的研制周期。试验结果表明,该试验技术长期有效可靠,可为同类型试验提供技术依据和应用参考。

Parallel Fatigue Test Technology of Multiple Structures in Ultra-high Pressure Deep-sea Environment

The work aims to conduct fatigue tests of two manned capsules of the whole sea deep manned submersible. The stress state of the spherical shell under the action of pressure difference method and external pressure alone was compared and analyzed by theoretical method, and the feasibility of simulating the working environment of the spherical shell under ultra-high pressure deep sea was verified by the pressure difference method. At the same time, to reduce the damage of the test equipment caused by the external alternating load of the spherical shell and effectively shorten the test duration, a multi-structure parallel fatigue test technology was proposed, which took into account the ultra-high pressure deep-sea environment and adopted the internal and external pressure difference method. Based on this technology, the two-ball series fatigue test with nearly 7 000 cycles was carried out, which effectively ensured the development period of the whole sea deep-sea manned submersible. The test results show that this technology is effective and reliable for a long time, and can provide technical basis and application reference for the same type of tests.