预制止裂线对DT4C工业纯铁疲劳裂纹扩展行为的影响
Effect of Prefabricated Crack Arrest Line on Fatigue Crack Growth Behavior of Industrial Pure Iron DT4C
摘 要
借助ANSYS仿真结果，确定在疲劳裂纹扩展路径上预制“直线-圆”形止裂线的尺寸；在DT4C工业纯铁上加工出标准扩展紧凑拉伸试样，在距其U型切口根部不同距离（La分别为6.4，7.0，7.6 mm）处预制止裂线，通过疲劳裂纹扩展试验及疲劳断口分析，研究了La对试样疲劳裂纹扩展行为的影响。结果表明：当La为7.6 mm时，止裂线的引入降低了裂纹尖端的应力，延长了试样的疲劳寿命；在裂纹尖端到达止裂线位置之前，当La为6.4 mm时，止裂线的引入提高了裂纹扩展速率，而当La为7.6 mm时则降低了试样的裂纹扩展速率；在裂纹尖端穿过止裂线位置之后，含止裂线试样的裂纹扩展速率均明显降低；不含止裂线和含止裂线试样的裂纹扩展区呈现疲劳辉纹特征，瞬断区呈现韧窝断裂特征。
疲劳裂纹扩展
止裂线
应力分布
fatigue fracture
fatigue crack growth
crack arrest line
stress distribution
Abstract
According to the ANSYS simulation, the size of the prefabricated "straight-circle" shaped crack arrest line on the fatigue crack growth path was determined. Standard extended compact tensile specimens were sampled from industrial pure iron DT4C, and then crack arrest lines were prefabricated at different distances from the root of the U-shaped notch (La was 6.4, 7.0, 7.6 mm, respectively). The effect of La on the fatigue crack growth behavior of specimens was studied by fatigue crack growth tests and fatigue fracture surface analysis. The results show that when La was 7.6 mm, the introduction of crack arrest line reduced the stress at the crack tip and prolonged the fatigue life of the specimen. Before the crack tip reached the arrest crack line position, the introduction of the crack arrest line at La of 6.4 mm improved the crack growth rate, while that at La of 7.6 mm reduced the crack growth rate. After the fatigue crack tip passed through the crack arrest line position, the crack growth rates of all the specimens with crack arrest line decreased significantly. The crack growth zone of specimens without and with crack arrest lines showed fatigue striation characteristics and the instantaneous fracture zone showed dimple fracture characteristics.
中图分类号 TG142 DOI 10.11973/jxgccl201912002
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（11672048，51405029）
收稿日期 2018/12/2
修改稿日期 2019/11/12
网络出版日期
作者单位点击查看
备注张春国(1982-),男,山东临沂人,教授,博士
引用该论文: ZHANG Chunguo,LIU Qiankun,LI Guangshang,LIU Rongwei. Effect of Prefabricated Crack Arrest Line on Fatigue Crack Growth Behavior of Industrial Pure Iron DT4C[J]. Materials for mechancial engineering, 2019, 43(12): 7～11
张春国,刘乾坤,李光尚,刘荣伟. 预制止裂线对DT4C工业纯铁疲劳裂纹扩展行为的影响[J]. 机械工程材料, 2019, 43(12): 7～11
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【4】AYATOLLAHI M R, HASHEMI R. Mixed mode fracture in an inclined center crack repaired by composite patching[J]. Composite Structures, 2007, 81(2):264-273.
【5】MENDEZ P F, EAGAR T W. Penetration and defect formation in high-current arc welding[J]. Welding Journal, 2003, 82(10):296-306.
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【7】赵少汴. 抗疲劳设计手册[M]. 2版. 北京:机械工业出版社, 1994.
【8】RAZAVI S M J, AYATOLLAHI M R, SOMMITSCH C, et al. Retardation of fatigue crack growth in high strength steel S690 using a modified stop-hole technique[J]. Engineering Fracture Mechanics, 2017, 169:226-237.
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【10】袁周致远, 吉伯海, 傅中秋. 钢结构疲劳裂纹合理止裂孔形状研究[J]. 南京理工大学学报, 2017, 41(5):556-561.
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【12】SONG P S, SHIEH Y L. Stop drilling procedure for fatigue life improvement[J]. International Journal of Fatigue, 2004, 26(12):1333-1339.
【13】GHFIRI R, AMROUCHE A, IMAD A, et al. Fatigue life estimation after crack repair in 6005 A-T6 aluminium alloy using the cold expansion hole technique[J]. Fracture of Engineering Materials and Structures,2000,23(11):911-916.
【14】GHFIRI R, SHI H J, GUO R, et al. Effects of expanded and non-expanded hole on the delay of arresting crack propagation for aluminum alloys[J]. Materials Science and Engineering:A, 2000, 286(2):244-249.
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【16】AYATOLLAHI M R, RAZAVI S M J, YAHYA M Y. Mixed mode fatigue crack initiation and growth in a CT specimen repaired by stop hole technique[J]. Engineering Fracture Mechanics, 2015, 145: 115-127.
【17】AYATOLLAHI M R, RAZAVI S M J, CHAMANI H R. A numerical study on the effect of symmetric crack flank holes on fatigue life extension of a SENT specimen[J]. Fatigue & Fracture of Engineering Materials & Structures, 2014, 37(10): 1153-1164.
【18】SHIN C S, WANG C M, SONG P S. Fatigue damage repair: A comparison of some possible methods[J]. International Journal of Fatigue, 1996, 18(8): 535-546.
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