Article(id=1281616674235334662, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1281616655499366465, articleNumber=null, orderNo=null, doi=10.16265/j.cnki.issn1003-3033.2026.02.0231, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1758297600000, receivedDateStr=2025-09-20, revisedDate=1764172800000, revisedDateStr=2025-11-27, acceptedDate=null, acceptedDateStr=null, onlineDate=1783490826424, onlineDateStr=2026-07-08, pubDate=1772208000000, pubDateStr=2026-02-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1783490826424, onlineIssueDateStr=2026-07-08, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1783490826424, creator=13701087609, updateTime=1783490826424, updator=13701087609, issue=Issue{id=1281616655499366465, tenantId=1146029695717560320, journalId=1146031787341344770, year='2026', volume='36', issue='2', pageStart='1', pageEnd='270', issueExtLink='null', onlineDate='null', pubDate='1772208000000', pubDateStr='2026-02-28', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1783490821957, creator='13701087609', updateTime=1783588693138, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1282027157069218127, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1281616655499366465, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1282027157069218128, tenantId=1146029695717560320, journalId=1146031787341344770, issueId=1281616655499366465, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=110, endPage=120, ext={EN=ArticleExt(id=1281616674478604295, articleId=1281616674235334662, tenantId=1146029695717560320, journalId=1146031787341344770, language=EN, title=Fatigue crack initiation life prediction of thermal pipelines under multi-defect interaction, columnId=1277328337617941059, journalTitle=China Safety Science Journal, columnName=Safety Technology and Engineering, runingTitle=null, highlight=null, articleAbstract=

To address the challenge of accurately predicting the fatigue crack initiation life caused by surface pitting corrosion in buried thermal pipelines during design, operation, and maintenance, this study employed the finite element method to investigate the influence of pit morphology, defect interaction, and axial loading on the maximum stress concentration factor K_t. An empirical formula for K_t was proposed, and a prediction method for fatigue crack initiation life under soil corrosion was developed. A pipeline in service in Beijing was used as a case study to verify the scientificity and effectiveness of this method. The results indicate that a 10-fold increase in pit depth leads to a 2.84-fold increase in K_t, while a 10-fold reduction in pit circumferential width results in a 4.75-fold increase. Deep and narrow defects characterized by a/c > 0.6 and b/c < 0.6 exert a stronger effect on increasing K_t and significantly shorten crack initiation life. When the defect spacing d=0, K_t reaches 1.03 times that of a single defect. The smaller the defect spacing, the stronger the interaction effects and the lower the crack initiation life. As defect spacing decreases, the fatigue crack initiation life of deep narrow pits is reduced to 0.12 times the original life, whereas shallow wide pits are more sensitive to spacing, with their crack initiation life reduced to 0.83 times the original life. Under conditions of low soil resistivity, low pH, and elevated temperature, crack initiation may occur within 20 years. The crack initiation life of shallow wide pits is more sensitive to soil parameters. Compared with internal pressure loading alone, an axial compressive load of 20 MPa significantly reduces crack initiation life by 0.74 times. Increasing axial tensile load from 20 MPa to 50 MPa results in a further life reduction of 0.82 times.

, authors=Shuqi MA, Xinquan LIU^**, Shuran LYU, authorsList=Shuqi MA, Xinquan LIU, Shuran LYU, authorCompany=null, correspAuthors=Xinquan LIU, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1281616675644620811, articleId=1281616674235334662, tenantId=1146029695717560320, journalId=1146031787341344770, language=CN, title=多缺陷相互作用下热力管道疲劳裂纹萌生寿命预测, columnId=1277328337940902469, journalTitle=中国安全科学学报, columnName=安全技术与工程, runingTitle=null, highlight=null, articleAbstract=

为解决埋地热力管道设计、使用及维护过程中外表面蚀坑腐蚀疲劳裂纹萌生寿命难以预测的问题，采用有限元方法探讨蚀坑形貌、缺陷间相互作用及轴向载荷对最大应力集中系数的影响，提出K_t经验公式，并建立土壤腐蚀下热力管道疲劳裂纹萌生寿命预测方法，以北京市某运行管道为例，验证该方法的科学性和有效性。结果表明：蚀坑深度增大10倍，K_t提高2.84倍，周向宽度减小10倍，K_t提高4.75倍，a/c>0.6、b/c<0.6深窄缺陷对K_t提高效应更强，裂纹萌生寿命更短；缺陷间距d=0时，K_t达单缺陷效应的1.03倍；缺陷间距越小相互作用效应越强，裂纹萌生寿命越低，随缺陷间距减小，深窄蚀坑寿命降幅达0.12倍，浅宽蚀坑对缺陷间距更敏感，裂纹萌生寿命降幅达0.83倍；低土壤电阻率、低pH值及高温下，裂纹可在20 a内萌生，浅宽蚀坑裂纹萌生寿命对土壤参数更敏感；与仅受内压载荷工况相比，20 MPa轴向压载荷显著降低裂纹萌生寿命0.74倍；20 MPa轴向拉载荷增大至50 MPa引起的裂纹萌生寿命降幅更大，为0.82倍。

, authors=马舒琪副教授, 刘鑫泉^**, 吕淑然教授, authorsList=马舒琪副教授, 刘鑫泉, 吕淑然教授, authorCompany=null, correspAuthors=刘鑫泉, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=u7sRaBio0xwR2RQC6v9KhQ==, magXml=NMLhWEQZFsRgVvuagWI5Aw==, pdfUrl=null, pdf=MGk7qU0T+RI6xSGm53eA7w==, pdfFileSize=2430408, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=5CXmqFKN9hVeWWtnRu9C9g==, mapNumber=null, fund=null)}, authors=[Author(id=1281616677641109521, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1281616674235334662, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=shuqi_10@163.com, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1281616677733384211, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1281616674235334662, authorId=1281616677641109521, language=EN, stringName=Shuqi MA, firstName=Shuqi, middleName=null, lastName=MA, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=School of Management Engineering, Capital University of Economics and Business, Beijing 100070, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1281616677813075988, tenantId=1146029695717560320, journalId=1146031787341344770, articleId=1281616674235334662, authorId=1281616677641109521, language=CN, stringName=马舒琪副教授, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=null, address=首都经济贸易大学 管理工程学院，北京 100070, bio={"content":"

马舒琪（1985—），女，河北保定人，博士，副教授，主要从事风险评估、风险预测与决策、城市运行安全等方面的研究。E-mail:shuqi_10@163.com。

"}, bioImg=null, bioContent=

马舒琪（1985—），女，河北保定人，博士，副教授，主要从事风险评估、风险预测与决策、城市运行安全等方面的研究。E-mail:shuqi_10@163.com。

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