哈尔滨工程大学学报2012，Vol.33Issue(8)：984-988,5.DOI:10.3969/j.issn.1006-7043.201108008
油气输送管道疲劳裂纹起裂特性与影响因素
Initial fracture behavior and influencing factors of fatigue cracks in an oil-gas pipeline
摘要
Abstract
In order to study bent fatigue crack behavior within an oil-gas pipeline, slant fatigue cracks were created in a specimen to simulate actual cracks in the pipelines. The stress ratio of the loading was 0 and -1 in this test. The angle of the fatigue crack was 45°. Mode I stress intensity factor (KⅠ )mes and mode II stress intensity factors (AⅡ )mes, which were regarded as the initial fracture criteria of a crack, were calculated by measuring opening/ sliding discontinuous displacement along the cracks. Furthermore, suppressing stress intensity factors of mode I and mode Ⅱ (K Ⅰ) 5 and (KⅡ) s were obtained, and then the influencing factors were discussed. As a result, ( K Ⅰ ) 5 and (KⅡ )s are smaller than zero for both fatigue cracks made under stress ratios of 0 and - 1, because of compres-sive residual stress around the cracks which caused the crack surface contact , On the other hand, ( K Ⅰ ) s and ( K Ⅱ ) s equal nearly zero for annealed cracks with both stress ratios of 0 and - 1, Therefore, it can be considered that the compressive residual stress will restrain the crack to expand at the initial fracture stage.关键词
油气管道/疲劳裂纹/裂纹起裂/残余应力/应力强度因子Key words
oil-gas pipeline/ fatigue crack/ initial fracture stage/ compressive residual stress/ stress intensity factor分类
建筑与水利引用本文复制引用
马有理..油气输送管道疲劳裂纹起裂特性与影响因素[J].哈尔滨工程大学学报,2012,33(8):984-988,5.基金项目
黑龙江省自然科学基金资助项目(E201057). （E201057）
