腐蚀疲劳点蚀演化及腐蚀疲劳裂纹成核机制研究

发布时间：2018-12-31 17:07

【摘要】：作为一种不可逆的热力学过程,腐蚀疲劳的点蚀演化伴随着体系能量的耗散。文章基于热力学原理,对腐蚀疲劳点蚀演化过程中的能量问题进行探索性研究。引入双变量点蚀模型,建立点蚀演化过程中体系热力学势函数,推导了点蚀形状参数在演化过程中的变化方程,并分析了体系应变能、表面能和电化学能对点蚀演化形貌的影响机制及规律。根据裂纹成核位错机理建立了腐蚀疲劳裂纹成核临界条件的能量准则,并与应力强度因子准则进行比较,分析结果验证了能量准则的合理性。
[Abstract]:As an irreversible thermodynamic process, the pitting evolution of corrosion fatigue is accompanied by energy dissipation of the system. Based on the thermodynamic principle, the energy problem in the evolution of corrosion fatigue pitting is studied in this paper. The bivariate pitting model is introduced to establish the thermodynamic potential function of the system during the pitting evolution. The variation equation of the pitting shape parameters in the evolution process is derived, and the strain energy of the system is analyzed. The influence mechanism and law of surface energy and electrochemical energy on the morphology of pitting evolution. Based on the mechanism of crack nucleation dislocation, the energy criterion of critical condition for corrosion fatigue crack nucleation is established and compared with the stress intensity factor criterion. The results show that the energy criterion is reasonable.
【作者单位】：中国石油大学储运与建筑工程学院;
【基金】：国家自然科学基金(51404286) 山东省自然科学基金(ZR2014EEQ018) 青岛经济技术开发区重点科技发展计划项目(2013-1-53)
【分类号】：TG171;O346.1

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