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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
Source PublicationEUROPEAN JOURNAL OF MECHANICS A-SOLIDS
2018-05-01
Volume69Pages:135-146
ISSN0997-7538
AbstractFracture 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.
KeywordConstraint Biaxial Loading Cruciform Specimen Local Approach To Fracture
DOI10.1016/j.euromechsol.2017.12.006
Indexed BySCI ; EI
Language英语
WOS IDWOS:000430767100012
WOS KeywordPRESSURIZED THERMAL SHOCKS ; CRACK-TIP FIELDS ; FRACTURE ASSESSMENT ; HARDENING MATERIAL ; STRESS ; PARAMETERS ; INPLANE ; STEELS
WOS Research AreaMechanics
WOS SubjectMechanics
Funding OrganizationSwiss Federal Nuclear Safety Inspectorate (ENSI) (DIS-Vertrag)(H-100668)
Classification一类
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/77472
Collection非线性力学国家重点实验室
Recommended Citation
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.
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