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裂紋尖端彈塑性與氫擴(kuò)散耦合分析
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Coupling Analysis of Elastoplastic-diffusion and Hydrogen Transport near Blunt Crack Tip
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    摘要:

    提出描述鈍性裂紋尖端氫擴(kuò)散現(xiàn)象的數(shù)學(xué)模型,，將結(jié)構(gòu)分析和氫擴(kuò)散分析的結(jié)果進(jìn)行耦合計(jì)算,，運(yùn)用有限元方法揭示靜水壓力,、塑性變形與氫擴(kuò)散的關(guān)系,，研究塑性變形與氫在裂紋尖端區(qū)域協(xié)同作用的影響規(guī)律,。結(jié)合氫擴(kuò)散分析結(jié)果,，用有限元方法評(píng)價(jià)材料的大變形彈塑性行為,，考慮局部流動(dòng)應(yīng)力的氫效應(yīng),，用有限元分析解決鈍性裂縫尖端的平衡氫分布和大應(yīng)變彈塑性邊界值的耦合問(wèn)題,。

    Abstract:

    A mathematical model which described the hydrogen diffusivity near blunt crack tip was proposed. Coupled calculation model for structure and hydrogen diffusion analysis were put forward. Using finite element, the relations between hydrostatic pressure, plastic deformation and hydrogen diffusion were revealed. The synergy influence rules of plastic deformation and hydrogen near the crack tip were analyzed. Finite element method was used to evaluate the large deformation elasto-plastic behavior of the material with the hydrogen diffusion analysis results. Finite element analysis was employed to solve the coupled boundary-value problem of large strain elasto-plasticity and equilibrium hydrogen distributions near blunt crack tip by taking into consideration the effect of hydrogen on local flow stress. 

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吳曉金,王家序,金山寬,肖科.裂紋尖端彈塑性與氫擴(kuò)散耦合分析[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2010,41(6):193-198.Coupling Analysis of Elastoplastic-diffusion and Hydrogen Transport near Blunt Crack Tip[J]. Transactions of the Chinese Society for Agricultural Machinery,2010,41(6):193-198.

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