本文選題：超聲疲勞 + 超高周疲勞　； 參考：《機械工程學報》2016年04期

【摘要】：在高頻循環(huán)載荷作用下,材料疲勞裂紋的萌生與擴展過程伴隨著明顯的溫度變化,該溫度變化反映材料內(nèi)部結(jié)構(gòu)的損傷特征。通過20 kHz的超聲疲勞試驗,研究一種碳錳鋼在超高周疲勞加載條件下的內(nèi)部疲勞裂紋萌生與擴展過程中溫度的演化過程。通過對該材料在疲勞損傷過程中,內(nèi)部裂紋間的摩擦生熱機理分析,從微觀角度出發(fā),結(jié)合分形理論,建立內(nèi)部裂紋微觀結(jié)構(gòu)的摩擦模型,數(shù)值模擬超聲疲勞過程中材料內(nèi)部疲勞裂紋面間的摩擦生熱情況,并定量地計算該過程中由裂紋間摩擦所導致的溫度上升,將模擬結(jié)果與試驗結(jié)果進行比較。探究高頻疲勞載荷下微裂紋擴展與摩擦生熱的關系,并結(jié)合超高周疲勞裂紋擴展公式,建立超聲疲勞過程中的裂紋擴展與裂紋面溫度演化關系的模型。
[Abstract]:Under high frequency cyclic loading, the initiation and propagation of fatigue cracks in the materials are accompanied by obvious temperature changes, which reflect the damage characteristics of the internal structures of the materials. The temperature evolution of internal fatigue crack initiation and propagation of a carbon-manganese steel under ultra-high cycle fatigue loading was studied by ultrasonic fatigue test at 20 kHz. Based on the analysis of friction heat generation mechanism between internal cracks in the process of fatigue damage, the friction model of internal crack microstructure is established from the microscopic point of view and the fractal theory. The friction heat generation between the fatigue crack surfaces in the material was simulated numerically, and the temperature rise caused by the friction between the cracks in the process was calculated quantitatively. The simulation results were compared with the experimental results. The relationship between microcrack growth and friction heat generation under high frequency fatigue loading is studied. A model of the relationship between crack growth and crack surface temperature evolution during ultrasonic fatigue is established by combining the ultra-high cycle fatigue crack propagation formula.
【作者單位】： 西北工業(yè)大學機電學院;
【基金】：自然科學基礎研究計劃資助項目(2015JM1007)
【分類號】：TG115.57
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本文編號：2031486