大连海事大学学报
大連海事大學學報
대련해사대학학보
JOURNAL OF DALIAN MARITIME UNIVERSITY
2014年
3期
108-112
,共5页
焊接接头%多轴高周疲劳%修正W?hler曲线方法( MWCM)%非比例
銲接接頭%多軸高週疲勞%脩正W?hler麯線方法( MWCM)%非比例
한접접두%다축고주피로%수정W?hler곡선방법( MWCM)%비비례
welded joints%multiaxial high-cycle fatigue%modified W?hler curve method ( MWCM )%non-proportional
本文主要对焊接接头的多轴高周疲劳评估方法展开研究.针对某管板焊接接头,分别采用Von Mises等效应力法、Eurocode3规范方法、IIW规范方法以及修正W?hler曲线方法( MWCM )计算其多轴高周疲劳损伤寿命,并与试验寿命进行比较.对四种方法预测寿命的标准差进行分析.结果显示,等效应力法能够准确预测比例加载下的多轴高周疲劳寿命,但并不适用于估算非比例加载下的多轴疲劳损伤寿命,且预测结果偏于危险.MWCM既能够适用于比例加载下的多轴高周疲劳损伤寿命预测,也适用于非比例加载下的多轴高周疲劳损伤寿命预测,且预测寿命的标准差较小.
本文主要對銲接接頭的多軸高週疲勞評估方法展開研究.針對某管闆銲接接頭,分彆採用Von Mises等效應力法、Eurocode3規範方法、IIW規範方法以及脩正W?hler麯線方法( MWCM )計算其多軸高週疲勞損傷壽命,併與試驗壽命進行比較.對四種方法預測壽命的標準差進行分析.結果顯示,等效應力法能夠準確預測比例加載下的多軸高週疲勞壽命,但併不適用于估算非比例加載下的多軸疲勞損傷壽命,且預測結果偏于危險.MWCM既能夠適用于比例加載下的多軸高週疲勞損傷壽命預測,也適用于非比例加載下的多軸高週疲勞損傷壽命預測,且預測壽命的標準差較小.
본문주요대한접접두적다축고주피로평고방법전개연구.침대모관판한접접두,분별채용Von Mises등효응역법、Eurocode3규범방법、IIW규범방법이급수정W?hler곡선방법( MWCM )계산기다축고주피로손상수명,병여시험수명진행비교.대사충방법예측수명적표준차진행분석.결과현시,등효응역법능구준학예측비례가재하적다축고주피로수명,단병불괄용우고산비비례가재하적다축피로손상수명,차예측결과편우위험.MWCM기능구괄용우비례가재하적다축고주피로손상수명예측,야괄용우비비례가재하적다축고주피로손상수명예측,차예측수명적표준차교소.
The multiaxial high-cycle fatigue assessment method for welded joints was carried out .Von Mises equivalent stress method, Eurocode3 recommended method , IIW recommended method and Modified W?hler Curve Method ( MWCM ) were used to evaluate multiaxial high-cycle fatigue life of tube-plate welded joints , and results were compared with experimental fatigue life.Then the standard errors of estimated fatigue life for the four methods were analyzed .Results show that equiva-lent stress method can only be used to calculate multiaxial high-cycle fatigue life under proportional added multiaxial loads, whereas MWCM performed well to evaluate multiaxial fatigue life for welded structures subject to both proportional and non-proportional added multiaxial loads , moreover has a small standard error .