| FATIGUE CRACK GSOWTH AND CRACK CLOSURE OF SIMULATED OVER-MATCHED WELDED JOINTS |
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| 作者姓名： | X. Y. Li X. T. Tian and H. C. Zhu |
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| 作者单位： | 1)Weldng Division，Beijing Polytechnic University，Beijing 100022，China 2)National ho. of Advanced Welding Technology，HIT，Harbin 150001，China) |
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| 摘 要： | 1.~onItiswellknownthatthefatigUefailureisoneofthecornmonfailuresinmetalstructuresincludingweldedstmctures.VariousformulaehavebeensuggestedtopredictfatigUecrackgrowthrates,andthosewidelyusedinpracticeareasfollows:da/dN=cI(AK)acda/dN=c2(ACOD)?/dN=c3(AJ)%FortnulaeaboverelatedfatigUecrackgrowthrate(da/dN)eitherwiththerangeofstressintensityfactor(isK),orwiththerangeofcrackopeningdisplacement(ACOD),orwiththerangeofJ--intendvalue(6J)ofafatigUeloadcycle.However,sincethediscoverybyW.Elb..'…
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| 收稿时间： | 2000-02-25 |
| 修稿时间： | 2000-02-25 |
FATIGUE CRACK GSOWTH AND CRACK CLOSURE OF SIMULATED OVER-MATCHED WELDED JOINTS |
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| X. Y. Li, X. T. Tian and H. C. Zhu.FATIGUE CRACK GSOWTH AND CRACK CLOSURE OF SIMULATED OVER-MATCHED WELDED JOINTS[J].Acta Metallurgica Sinica(English Letters),2000,13(1):117-122. |
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| Authors: | X Y Li X T Tian and H C ZhuWeldng Division Beijing Polytechnic University Beijing China National ho of Advanced Welding Technology HIT Harbin China |
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| Affiliation: | X. Y. Li,X. T. Tian and H. C. Zhu( )Weldng Division,Beijing Polytechnic University,Beijing,China )National ho. of Advanced Welding Technology,HIT,Harbin,China) |
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| Abstract: | Mismatching is one of the basic characteristics of welded joints.Overmatched welded joint with a crack in hard weld is simplified as a cracked body of CCP type SHS (a hard bar sandwiched between two soft material with a crier perallel to the interface ) in this paper.Effects of mechanical heterogeneity on fatigue crack growth and crack closure of this model are studied by experimental and elastic - plastic finite element methods. It is found that, residual plastic deformation remaining in the wake of a growing crack tip, which cases crack closure,is affected the plastic deformation in adjacent soft mate- rial near by the crack tip. Both the shape of crack tip plastic zone and stress distribution ahead of crack tip in heterogeneous cracked body are different from that of homogeneous one. Crack closure (open- ing) loads are estimated by investigating the changes of crack tip opening displacement during fatigue loading, and a new model of crack oening process is presented. Because of the difference in the effect of mechanical heterogeneity on displacement of non - fatigue crack and fatigue crack, conventional CTOD can not reflect the real deformation at crack tip of SHS specimens. |
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| Keywords: | welded joint overmatching fatigue crack closure |
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