抽油杆杆体表面缺陷临界尺寸的确定 |
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引用本文: | 钟伯明 吴则中. 抽油杆杆体表面缺陷临界尺寸的确定[J]. 石油机械, 1990, 18(7): 22-30 |
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作者姓名: | 钟伯明 吴则中 |
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作者单位: | 大庆石油学院(钟伯明,魏嘉荃,张永弘),石油勘探开发科学研究院机械所(吴则中),石油勘探开发科学研究院机械所(田丰) |
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摘 要: | 应用应力强度因子表达式,在线弹性断裂力学K_I=K_(IC)判据的基础上,提出了25.40mm、22.23mm、19.05mm、15.88mm等4种规格的20CrMo钢D级抽油杆杆体存在局部表面缺陷时确定缺陷临界尺寸的8张图线,并举例说明了工程中使用这些图线的具体方法。对抽油杆杆体实际表面缺陷的简化也提出了原则性的处理意见。
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关 键 词: | 抽油杆 表面缺陷 断裂判据 |
The Critical Size of Surface Defect on the Sucker Rod Body |
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Abstract: | According to the criterion K_I= K_(IC) given in linear-elastic fracture mechanics and using the expression of stress-intensity factor, this articlc presents eight graphs for determining the critical size of local surface defect on the body of grade D sucker rods of four sizes: 25.40, 22.23, 19.05 and 15.88mm. An example is given to explain the method of using these graphs. Recommended practices are presented for regularizing actual surface defects for the convenience of study. |
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