【摘要】：作為一種不可逆的熱力學(xué)過程,腐蝕疲勞的點(diǎn)蝕演化伴隨著體系能量的耗散。文章基于熱力學(xué)原理,對腐蝕疲勞點(diǎn)蝕演化過程中的能量問題進(jìn)行探索性研究。引入雙變量點(diǎn)蝕模型,建立點(diǎn)蝕演化過程中體系熱力學(xué)勢函數(shù),推導(dǎo)了點(diǎn)蝕形狀參數(shù)在演化過程中的變化方程,并分析了體系應(yīng)變能、表面能和電化學(xué)能對點(diǎn)蝕演化形貌的影響機(jī)制及規(guī)律。根據(jù)裂紋成核位錯(cuò)機(jī)理建立了腐蝕疲勞裂紋成核臨界條件的能量準(zhǔn)則,并與應(yīng)力強(qiáng)度因子準(zhǔn)則進(jìn)行比較,分析結(jié)果驗(yàn)證了能量準(zhǔn)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(xué)儲(chǔ)運(yùn)與建筑工程學(xué)院;
【基金】：國家自然科學(xué)基金(51404286) 山東省自然科學(xué)基金(ZR2014EEQ018) 青島經(jīng)濟(jì)技術(shù)開發(fā)區(qū)重點(diǎn)科技發(fā)展計(jì)劃項(xiàng)目(2013-1-53)
【分類號(hào)】：TG171;O346.1

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