| 基于小裂纹的2024-T3铝合金中心孔试样疲劳寿命预测 |
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| 引用本文： | 陈勃,刘建中,胡本润.基于小裂纹的2024-T3铝合金中心孔试样疲劳寿命预测[J].航空材料学报,2009,29(2):97-100. |
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| 作者姓名： | 陈勃 刘建中 胡本润 |
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| 作者单位： | 北京航空材料研究院,北京,100095 |
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| 摘 要： | 对2024-T3铝合金板材中心孔试样进行了疲劳裂纹扩展行为及寿命预测的理论和试验研究.采用疲劳条带与显微镜观测相结合的办法获得试样在块谱作用下孔边自然萌生裂纹扩展的α-N数据,并通过对断口的SEM观察获取试样的初始缺陷形状.利用基于裂纹闭合的小裂纹扩展分析程序FASTRAN3.9对试样α-N数据进行反推,建立了描述孔边裂纹细节原始疲劳质量的当量初始缺陷尺寸(EIFS)分布.以该分布为基础,采用FASTRAN3.9对试样进行了恒幅载荷下试样的中值疲劳S-N曲线的预测,预测结果与试验验证结果吻合较好.
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| 关 键 词： | 小裂纹扩展理论 中心孔试样 疲劳寿命预测 |
Fatigue Life Prediction for Center-Hole Specimen of 2024-T3 Aluminum Alloy Sheet Based on Small Crack Method |
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| CHEN Bo,LIU Jian-zhong,HU Ben-run.Fatigue Life Prediction for Center-Hole Specimen of 2024-T3 Aluminum Alloy Sheet Based on Small Crack Method[J].Journal of Aeronautical Materials,2009,29(2):97-100. |
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| Authors: | CHEN Bo LIU Jian-zhong HU Ben-run |
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| Institution: | Beijing Institute of Aeronautical Materials;Beijing 100095;China |
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| Abstract: | Experimental and analytical studies were made on fatigue behavior and life prediction for center-hole specimen of 2024-T3 aluminum alloy sheet.The crack growth a-N data,which naturally initiated from notches under block spectrum,were achieved by the methods of fatigue striations and microscope observation.SEM observation was also made to get the initial flaw shape.A small crack methodology based on the plasticity-induced crack-closure concept and the corresponding analysis program FASTRAN3.9 was used to ded... |
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| Keywords: | small crack theory center-hole specimens fatigue life prediction |
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