【摘要】：基于連續(xù)損傷力學(xué)(CDM)的經(jīng)典損傷理論和不可逆熱力學(xué)原理,分別對(duì)高周和低周疲勞載荷下的損傷演化模型進(jìn)行了研究,進(jìn)而推導(dǎo)出一個(gè)新的高低周復(fù)合疲勞損傷模型;將該模型編寫(xiě)為UMAT耦合到ABAQUS有限元分析軟件中,實(shí)現(xiàn)了對(duì)缺口材料高低周復(fù)合疲勞損傷的模擬及裂紋萌生位置和萌生壽命的預(yù)測(cè);同時(shí)研究了不同的高低周循環(huán)比對(duì)裂紋萌生壽命的影響.結(jié)果表明,裂紋容易在缺口根部應(yīng)力集中處萌生;該模型考慮了高低周循環(huán)的交互作用,模擬計(jì)算結(jié)果更符合實(shí)際情況;同時(shí)通過(guò)研究發(fā)現(xiàn)高的循環(huán)比會(huì)使裂紋的萌生加速.
[Abstract]:Based on the classical damage theory and irreversible thermodynamic principle of continuous damage mechanics (CDM), the damage evolution models under high-cycle and low-cycle fatigue loads are studied respectively, and a new high-low-cycle composite fatigue damage model is derived. The model is programmed as UMAT and coupled to ABAQUS finite element analysis software. The simulation of fatigue damage and prediction of crack initiation position and initiation life of notched materials with high and low cycles are realized. At the same time, the influence of high and low cycle ratio on crack initiation life was studied. The results show that the crack initiation is easy to occur at the stress concentration at the notch root; the interaction between high and low cycle cycles is considered in the model, and the simulation results are more consistent with the actual situation; at the same time, it is found that the crack initiation can be accelerated by high cycle ratio.
【作者單位】： 天津大學(xué)材料學(xué)院;天津市現(xiàn)代連接技術(shù)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(50975196,50805103)
【分類(lèi)號(hào)】：TB30
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本文編號(hào)：2436076