Offshore platforms are always subjected to wave action which is random variable amplitude cyclic loading. In order to simulate the stressing condition at the 'hot spot' of the tubular joints and the marine env...Offshore platforms are always subjected to wave action which is random variable amplitude cyclic loading. In order to simulate the stressing condition at the 'hot spot' of the tubular joints and the marine environment, random variable amplitude fatigue tests have been carried out on welded plate joints in sea water. The tests have been conducted under the conditions of loading frequency of 0.2 Hz/, stress ratio of -1, seawater temperature of about 20°C and cathodic protection with the potential about -850 mV, SCE. The test results have been compared with the seawater corrosion fatigue life under constant amplitude loading. Miner's linear cumulative damage summation rule has been used to predict the corrosion fatigue life under variable amplitude loading. The predicted life is in good agreement with the test data.展开更多
设计了一种能够同时实现施加交变载荷和拉伸的力学性能测试装置。介绍了测试装置的工作原理和系统组成:用于测量拉伸载荷的力传感器基于压阻效应且为双平行式柔性铰链结构,分辨率高达2 m N;施加交变载荷的振动模块由压电陶瓷和杠杆放大...设计了一种能够同时实现施加交变载荷和拉伸的力学性能测试装置。介绍了测试装置的工作原理和系统组成:用于测量拉伸载荷的力传感器基于压阻效应且为双平行式柔性铰链结构,分辨率高达2 m N;施加交变载荷的振动模块由压电陶瓷和杠杆放大机构组成,最高可实现0.7 k Hz的稳定输出。介绍了基于VB.NET软件平台开发的数据采集及运动控制系统,实现了动静平台的自动调平和拉伸测试功能。通过对比预施加交变载荷和直接拉伸的拉伸测试的重复实验,验证了设计装置的可行性与稳定性。展开更多
文摘Offshore platforms are always subjected to wave action which is random variable amplitude cyclic loading. In order to simulate the stressing condition at the 'hot spot' of the tubular joints and the marine environment, random variable amplitude fatigue tests have been carried out on welded plate joints in sea water. The tests have been conducted under the conditions of loading frequency of 0.2 Hz/, stress ratio of -1, seawater temperature of about 20°C and cathodic protection with the potential about -850 mV, SCE. The test results have been compared with the seawater corrosion fatigue life under constant amplitude loading. Miner's linear cumulative damage summation rule has been used to predict the corrosion fatigue life under variable amplitude loading. The predicted life is in good agreement with the test data.
文摘设计了一种能够同时实现施加交变载荷和拉伸的力学性能测试装置。介绍了测试装置的工作原理和系统组成:用于测量拉伸载荷的力传感器基于压阻效应且为双平行式柔性铰链结构,分辨率高达2 m N;施加交变载荷的振动模块由压电陶瓷和杠杆放大机构组成,最高可实现0.7 k Hz的稳定输出。介绍了基于VB.NET软件平台开发的数据采集及运动控制系统,实现了动静平台的自动调平和拉伸测试功能。通过对比预施加交变载荷和直接拉伸的拉伸测试的重复实验,验证了设计装置的可行性与稳定性。
