腐蝕疲勞點蝕演化及腐蝕疲勞裂紋成核機制研究
發(fā)布時間：2018-12-31 17:07
【摘要】：作為一種不可逆的熱力學過程,腐蝕疲勞的點蝕演化伴隨著體系能量的耗散。文章基于熱力學原理,對腐蝕疲勞點蝕演化過程中的能量問題進行探索性研究。引入雙變量點蝕模型,建立點蝕演化過程中體系熱力學勢函數(shù),推導了點蝕形狀參數(shù)在演化過程中的變化方程,并分析了體系應變能、表面能和電化學能對點蝕演化形貌的影響機制及規(guī)律。根據(jù)裂紋成核位錯機理建立了腐蝕疲勞裂紋成核臨界條件的能量準則,并與應力強度因子準則進行比較,分析結果驗證了能量準則的合理性。
[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.
【作者單位】： 中國石油大學儲運與建筑工程學院;
【基金】：國家自然科學基金(51404286) 山東省自然科學基金(ZR2014EEQ018) 青島經(jīng)濟技術開發(fā)區(qū)重點科技發(fā)展計劃項目(2013-1-53)
【分類號】：TG171;O346.1
本文編號：2396870
[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.
【作者單位】： 中國石油大學儲運與建筑工程學院;
【基金】：國家自然科學基金(51404286) 山東省自然科學基金(ZR2014EEQ018) 青島經(jīng)濟技術開發(fā)區(qū)重點科技發(fā)展計劃項目(2013-1-53)
【分類號】：TG171;O346.1
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1 張?zhí)炝?朱金花;何世平;;應用微相關技術研究裂端彈塑性變形[A];中國力學學會學術大會'2005論文摘要集（上）[C];2005年
，本文編號：2396870
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