Article(id=1202250857615155892, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1202250853794148439, articleNumber=null, orderNo=null, doi=10.19710/J.cnki.1003-8817.20220215, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=null, receivedDateStr=null, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1764568541196, onlineDateStr=2025-12-01, pubDate=1674144000000, pubDateStr=2023-01-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1764568541196, onlineIssueDateStr=2025-12-01, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1764568541196, creator=13701087609, updateTime=1764568541196, updator=13701087609, issue=Issue{id=1202250853794148439, tenantId=1146029695717560320, journalId=1189873562199433220, year='2023', volume='', issue='1', pageStart='1', pageEnd='72', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1764568540285, creator=13701087609, updateTime=1764576081444, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1202282483787194627, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1202250853794148439, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1202282483787194628, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1202250853794148439, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=45, endPage=49, ext={EN=ArticleExt(id=1202250857900368575, articleId=1202250857615155892, tenantId=1146029695717560320, journalId=1189873562199433220, language=EN, title=Fracture Failure Analysis of Fixing Bolt for Engine Ignition Coil, columnId=null, journalTitle=Automobile Technology & Material, columnName=null, runingTitle=null, highlight=null, articleAbstract=
Macro and micro fracture analysis shows that the ignition coil fixing bolt is mainly fractured by torsional load, and the micro fracture is a clockwise shear dimple. Through comparative analysis of simulated assembly test, the fracture surface of the failed part is consistent with the fracture surface of the bolt under pure torsional load, so the fracture mode of the bolt is torsional fracture failure (shear stress). The cause of torsional fracture may be that when the spark plug is replaced for the second time, the bolt is not screwed in normally (the internal thread is damaged or the bolt is screwed in obliquely), and the tightening torque is higher than the torsional fracture torque (14 N·m) of the bolt, which finally leads to the torsional fracture of the bolt.
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通过宏观和微观断口分析,点火线圈固定螺栓主要受扭转载荷而断裂,微观断口呈顺时针方向剪切韧窝。通过模拟装配测试对比分析,失效件断口和受纯扭转载荷断裂的断口一致,因此螺栓的断裂模式为扭转(剪切应力)断裂失效。而导致扭转断裂的原因可能发生在第二次更换火花塞时,螺栓没有正常拧入(内螺纹已损伤或螺栓倾斜拧入),且拧紧扭矩高于螺栓扭转断裂扭矩14 N·m,最终导致螺栓扭转断裂。
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柯胜蓝(1975—),男,硕士学位,研究方向为汽车材料质量控制及管理。
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柯胜蓝(1975—),男,硕士学位,研究方向为汽车材料质量控制及管理。
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柯胜蓝(1975—),男,硕士学位,研究方向为汽车材料质量控制及管理。
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| 序号 | 要求值 | 测试值 |
| 1 | 250~320 | 290 |
| 2 | 293 |
| 3 | 298 |
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失效螺栓硬度 HV10
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| 序号 | 要求值 | 测试值 |
| 1 | 250~320 | 290 |
| 2 | 293 |
| 3 | 298 |
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| 序号 | 模拟实验方法 | 受力状态 | 应力状态 |
| a | 实际零件上拧至失效 | 拉力+扭力 | 正应力+切应力 |
| b | 实际零件上重复拧紧(6次) | 拉力+扭力 | 正应力+切应力 |
| c | 将螺栓扭转断裂 | 扭力 | 切应力 |
| d | 将螺栓拧在螺母上至断裂 | 拉力+扭力 | 正应力+切应力 |
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失效模式假设与模拟装配
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| 序号 | 模拟实验方法 | 受力状态 | 应力状态 |
| a | 实际零件上拧至失效 | 拉力+扭力 | 正应力+切应力 |
| b | 实际零件上重复拧紧(6次) | 拉力+扭力 | 正应力+切应力 |
| c | 将螺栓扭转断裂 | 扭力 | 切应力 |
| d | 将螺栓拧在螺母上至断裂 | 拉力+扭力 | 正应力+切应力 |
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