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论文:2017,Vol:35,Issue(1):13-19 |
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引用本文： |
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鲁龙坤, 王生楠, 周俊杰, 李刚. 基于启裂载荷的临界裂纹尖端张开角确定[J]. 西北工业大学学报 |
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Lu Longkun, Wang Shengnan, Zhou Junjie, Li Gang. Critical Crack Tip Opening Angle Calculation Based on Crack Initiation Load[J]. Northwestern polytechnical university |
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| 基于启裂载荷的临界裂纹尖端张开角确定 |
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| 鲁龙坤, 王生楠, 周俊杰, 李刚 |
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| 西北工业大学 航空学院, 陕西 西安 710072 |
| 摘要: |
| 对临界CTOA的确定方法进行了研究，提出了一种新的临界CTOA的估算方法。该方法仅需要确定裂纹启裂载荷及裂纹扩展量为1 mm时的外载荷，相较于ASTM E2472给出的4种测量方法，该方法简单易推广。应用4件M（T）试样与6件C（T）试样对该方法进行了验证，结果表明：文中方法适用于平面应力状态，且计算误差不超过4%。此外，新方法的精度与所选外载荷有关，外载荷对应的裂纹扩展量越大CTOA的计算误差越大。 |
| 关键词:
裂纹启裂载荷
CTOA
裂纹尖端应力状态
裂纹稳态扩展
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| Critical Crack Tip Opening Angle Calculation Based on Crack Initiation Load |
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| Lu Longkun, Wang Shengnan, Zhou Junjie, Li Gang |
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| School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| Critical CTOA calculation method is studied in this work,a novel critical CTOA calculation method has been proposed. Only crack initiation load and load corresponding to 1 mm crack extension are required. Compared with the four methods included in ASTM E2472, this method is easier to use. Four M(T) specimens and six C(T) specimens are taken to validate this method. Discrepancies are less than 4% under plane stress conditions. In addition, the accuracy of the proposed method is related to the external load selected, the larger crack extension corresponding to the external load, the less accuracy will be obtained. |
| Key words:
crack initiation load
CTOA
crack tip stress state
stable crack growth
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| 收稿日期: 2016-09-12
修回日期:
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| DOI: |
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| 作者简介: 鲁龙坤(1992-),西北工业大学博士研究生,主要从事断裂、损伤的研究。
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