Comparison of constraint analyses with global and local approaches under uniaxial and biaxial loadings

doi:10.1016/j.euromechsol.2017.12.006

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	Comparison of constraint analyses with global and local approaches under uniaxial and biaxial loadings
	Qian GA(钱桂安); Cao YP; Niffenegger M; Chao YJ.; Wu WW
刊名	EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
	2018-05-01
卷号	69 页码:135-146
关键词	Constraint Biaxial Loading Cruciform Specimen Local Approach To Fracture
ISSN号	0997-7538
DOI	10.1016/j.euromechsol.2017.12.006
文献子类	Article
英文摘要	Fracture toughness is an important material property used to perform the integrity assessment of engineering components containing cracks. Due to the difference in crack tip constraint, specimens may show different fracture toughness. The constraint difference for cruciform specimen with shallow crack, compact tension (CT) specimen and three point bending specimen with shallow and deep cracks are investigated. Both linear elastic and elastic-plastic fracture mechanics are applied to study the constraint effect based on two-parameter fracture criterion. Crack tip constraint depends on the applied loading. J-A(2) method is used to precisely capture the crack tip constraint and crack tip stress distributions. Local approach to fracture can be applied to transfer the fracture toughness among different specimens under uniaxial and biaxial loadings. In case of positive T.,fre, T-stress increases with K-1. In the case of negative T-stress T-stress decreases with K1. Q(-stress) generally decreases with applied loading for both deep crack and shallow crack cases. Loss of constraint occurs for the single-edged bending (SEB) specimen with deep crack and thus raises the question whether the SEB specimen is proper to be used to obtain material toughness. For the cruciform bending (CRB) specimen, the constraint at the crack tip surface shows a least constraint while the deepest point has a relatively higher constraint. At a fracture probability of 10%, the fracture toughness difference between CT specimen and CRB specimen is about 50 MPa m(0.5), i.e 200% of the fracture toughness. This big difference demonstrates the importance of considering the constraint effects in the integrity analysis.
分类号	一类
WOS关键词	PRESSURIZED THERMAL SHOCKS ; CRACK-TIP FIELDS ; FRACTURE ASSESSMENT ; HARDENING MATERIAL ; STRESS ; PARAMETERS ; INPLANE ; STEELS
WOS研究方向	Mechanics
语种	英语
WOS记录号	WOS:000430767100012
资助机构	Swiss Federal Nuclear Safety Inspectorate (ENSI) (DIS-Vertrag)(H-100668)
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/77472]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Qian GA,Cao YP,Niffenegger M,et al. Comparison of constraint analyses with global and local approaches under uniaxial and biaxial loadings[J]. EUROPEAN JOURNAL OF MECHANICS A-SOLIDS,2018,69:135-146.
APA	钱桂安,Cao YP,Niffenegger M,Chao YJ.,&Wu WW.(2018).Comparison of constraint analyses with global and local approaches under uniaxial and biaxial loadings.EUROPEAN JOURNAL OF MECHANICS A-SOLIDS,69,135-146.
MLA	钱桂安,et al."Comparison of constraint analyses with global and local approaches under uniaxial and biaxial loadings".EUROPEAN JOURNAL OF MECHANICS A-SOLIDS 69(2018):135-146.