环境与疲劳载荷耦合效应相关性理论模型

Correlation theory of environment model and fatigue load coupling effect

针对恶劣海洋环境作用下,结构的耐久性与环境作用的相关关系问题,通过对实验数据的分析,研究了干湿交替、冻融循环、腐蚀疲劳恶劣海洋环境作用的相关理论模型.研究结果表明:环境效应作用具有时间特性、作用的相继性和叠加性,各作用效应强度取决于作用前的结构状况,共同作用效应强度将放大作用效果,存在耦合关系,具有明显的相关关系;通过分析作用效应及相关试验结果,给出了基于斜平面的相关关系的理论模型、曲面及边界方程,明确了腐蚀疲劳破坏域的概念,且破坏域由外部曲面包围.

Aiming at the related problems between the durability of structure and the function of environment under the harsh marine environment, this paper studied the related theoretical model of the dry-wet alternation, freeze-thaw cycles and harsh marine environment of corrosion fatigue through the analysis of test data. The results of study shows that the environmental effect has time characteristic, succession and superposition. The strength of the effect depends on the former structure state, then the effect of joint action effect will be amplified. It exists coupling effect and has a significant correlation. By analyzing the effects and related test results, this paper provided the correlation model based on the inclined plane, surface and boundary equations. At the same time, it defined the concept of corrosion fatigue damage region, surrounded by an external curved surface.