Article(id=1195319924898963645, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1195319920000012443, articleNumber=null, orderNo=null, doi=10.19710/J.cnki.1003-8817.20230371, 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=1762916078066, onlineDateStr=2025-11-12, pubDate=1739980800000, pubDateStr=2025-02-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1762916078066, onlineIssueDateStr=2025-11-12, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1762916078066, creator=13701087609, updateTime=1762916078066, updator=13701087609, issue=Issue{id=1195319920000012443, tenantId=1146029695717560320, journalId=1189873562199433220, year='2025', volume='', issue='2', 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=1762916076894, creator=13701087609, updateTime=1762916415896, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1195321341915205752, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1195319920000012443, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1195321341915205753, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1195319920000012443, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=42, endPage=46, ext={EN=ArticleExt(id=1195319925767184579, articleId=1195319924898963645, tenantId=1146029695717560320, journalId=1189873562199433220, language=EN, title=Study on Interface Fatigue Cracking of A Through-Type Tail Light, columnId=1190284220686766583, journalTitle=Automobile Technology & Material, columnName=Original article, runingTitle=null, highlight=null, articleAbstract=
Through-type tail lamp of a vehicle type cracks and fails during road test and it is confirmed by analysis of the cracking position that the failure is a kind of interface fatigue cracking. To address this issue, the paper confirms that mismatch between thermal expansion coefficient of Heterotropic material and mechanical properties is the cause of failure cracking. Stress distribution of lampshade is calculated by CAE software combined with sun exposure test, which shows that the stress distribution location is consistent with physical lampshade cracking. In combination of the evaluation of stress result by means of S-N curve, it rationally explains the seasonal pattern of cracking. This method is used to evaluate through-type tail lamp with different materials, colors and structures, the results shows that the highest risk of cracking appears in through-type tail lamp made from black styrene, ASA and transparent Polymethyl Methacrylate (PMMA), which is consistent with the law of after-sales statistics data.
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某车型路试阶段出现了贯穿尾灯开裂失效,通过失效部位分析确定是界面疲劳开裂。为解决该问题,通过查阅文献将开裂诱因锁定为异性材料的热膨胀系数和力学性能的失配。结合阳光暴晒试验,使用计算机辅助工程(CAE)软件计算灯罩的应力分布,应力集中位置与实物开裂位置一致。结合材料应力-寿命(S-N)曲线评估应力结果,合理解释了开裂的季节性规律。利用该方法对不同材料、颜色、结构的贯穿尾灯进行评估,结果表明,使用黑色苯乙烯、丙烯腈和丙烯酸酯类橡胶体共聚合(ASA)和透明色聚甲基丙烯酸甲酯(PMMA)的贯穿尾灯开裂风险最大,与售后统计数据规律一致。
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孔新星(1989—),男,硕士学位,研究方向为汽车灯具性能研究及仿真方法。
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孔新星(1989—),男,硕士学位,研究方向为汽车灯具性能研究及仿真方法。
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孔新星(1989—),男,硕士学位,研究方向为汽车灯具性能研究及仿真方法。
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| 材料 | 弹性模量/MPa | 泊松比 |
| ASA | 2 473 | 0.37 |
| PMMA | 3 345 | 0.36 |
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| 材料 | 弹性模量/MPa | 泊松比 |
| ASA | 2 473 | 0.37 |
| PMMA | 3 345 | 0.36 |
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| 一色材料 | 二色材料 | 结构 | 应力/MPa | 判定 |
| PMMA黑 | PMMA红 | 覆盖 | 8.6 | 无风险 |
| PMMA黑 | PMMA透明 | 覆盖 | 13.5 | 无风险 |
| PMMA黑 | PMMA透明 | 包裹 | 10.3 | 无风险 |
| ASA黑 | PMMA红 | 覆盖 | 19.4 | 低风险 |
| ASA黑 | PMMA透明 | 覆盖 | 33.8 | 高风险 |
| ASA黑 | PMMA透明 | 包裹 | 17.9 | 低风险 |
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应力仿真结果
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| 一色材料 | 二色材料 | 结构 | 应力/MPa | 判定 |
| PMMA黑 | PMMA红 | 覆盖 | 8.6 | 无风险 |
| PMMA黑 | PMMA透明 | 覆盖 | 13.5 | 无风险 |
| PMMA黑 | PMMA透明 | 包裹 | 10.3 | 无风险 |
| ASA黑 | PMMA红 | 覆盖 | 19.4 | 低风险 |
| ASA黑 | PMMA透明 | 覆盖 | 33.8 | 高风险 |
| ASA黑 | PMMA透明 | 包裹 | 17.9 | 低风险 |
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| 序号 | 一色材料 | 二色材料 | 结构 | 试验 | 售后 |
| 1 | PMMA黑 | PMMA红 | 覆盖 | 无开裂 | 无 |
| 2 | PMMA黑 | PMMA透明 | 覆盖 | 应力开裂 | 无 |
| 3 | PMMA黑 | PMMA透明 | 包裹 | 无风险 | 无 |
| 4 | ASA黑 | PMMA红 | 覆盖 | 开裂 | 偶发 |
| 5 | ASA黑 | PMMA透明 | 覆盖 | 开裂 | 约3% |
| 6 | ASA黑 | PMMA透明 | 包裹 | 低风险 | 无 |
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阳光老化测试结果
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| 序号 | 一色材料 | 二色材料 | 结构 | 试验 | 售后 |
| 1 | PMMA黑 | PMMA红 | 覆盖 | 无开裂 | 无 |
| 2 | PMMA黑 | PMMA透明 | 覆盖 | 应力开裂 | 无 |
| 3 | PMMA黑 | PMMA透明 | 包裹 | 无风险 | 无 |
| 4 | ASA黑 | PMMA红 | 覆盖 | 开裂 | 偶发 |
| 5 | ASA黑 | PMMA透明 | 覆盖 | 开裂 | 约3% |
| 6 | ASA黑 | PMMA透明 | 包裹 | 低风险 | 无 |
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