【摘要】：基于連續(xù)損傷力學(CDM)的經典損傷理論和不可逆熱力學原理,分別對高周和低周疲勞載荷下的損傷演化模型進行了研究,進而推導出一個新的高低周復合疲勞損傷模型;將該模型編寫為UMAT耦合到ABAQUS有限元分析軟件中,實現了對缺口材料高低周復合疲勞損傷的模擬及裂紋萌生位置和萌生壽命的預測;同時研究了不同的高低周循環(huán)比對裂紋萌生壽命的影響.結果表明,裂紋容易在缺口根部應力集中處萌生;該模型考慮了高低周循環(huán)的交互作用,模擬計算結果更符合實際情況;同時通過研究發(fā)現高的循環(huán)比會使裂紋的萌生加速.
[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】： 天津大學材料學院;天津市現代連接技術重點實驗室;
【基金】：國家自然科學基金資助項目(50975196,50805103)
【分類號】：TB30
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本文編號：2436076