采用三点弯曲加载实验研究海水短期浸泡与载荷联合作用对Q235碳钢抗断裂性能的影响。测试分析在不同情况下该材料的断裂行为和海水浸泡前后最大承载力的变化。结果表明，加载到塑性区的试件在海水中短期浸泡后，再加载的位移载荷曲线的塑性阶段明显变短，断裂韧度降低并且试件变为脆性断裂。
In order to investigate the fracture properties of low carbon steel after seawater immersion and reloading, Q235 steel were made into a series of rectangle cross-section beams with prefabricated crack, and the specimens were divided a few group according to the history of its loading or reloading before and after soaking in room temperature seawater. The fracture behavior of specimen was analyzed in different test conditions, and their bearing capacity was compared with each other for loading before and after soaking. The length of plastic zone of specimen which was soaked in seawater for short-term after loaded into plastic zone became shorter and the material was more brittle.
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