Enhanced fracture assessment under biaxial external loads using small scale cruciform bending specimens

Hohe, Jörg; Luckow, Sabrina; Hardenacke, Volker; Sguaizer, Yves; Siegele, Dieter

doi:10.1016/j.engfracmech.2011.03.013

Cited by 10 publications

(12 citation statements)

References 12 publications

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“…Although the local crack-tip constraint near the surface still increases at higher loads, the amount of increase in local constraint become progressively less obvious and the overall distribution of A 2 is reduced, indicating that shallow crack effect (constraint loss effect) may predominate. These comparisons based on material variations show that the biaxial effect is material dependent and more pronounced in the material with lower yield stress, which is consistent with the trend revealed in the analysis of the CR(B) specimens with straight-fronted cracks [3,7,18].…”

Section: Constraint Analysis With J-a 2 Methodssupporting

confidence: 87%

“…Joyce et al [2] developed a medium scale CR(B) specimens (50×50 mm cross-section, 2T) design and performed the tests on an A533B steel. More recently, Jörg et al [3] showed that the major effects observed in large scale CR(B) specimen could be reproduced in the small-scale CR(B) specimen (10×20 mm cross-section). Numerical study by Sharp and Chao [4] showed that the biaxial effect as seen from the tests on the CR(B) specimens can be predicted by the J-A 2 theory.…”

Section: Introductionmentioning

confidence: 99%

“…2,3) are the dimensionless functions of n and θ, the stress power exponents s 1 , s 2 , s 3 (s l <s 2 <s 3 ) are only dependent of the hardening exponent n, =2s 2 -s 1 for n>3. L is a characteristic length parameter which can be chosen as the crack length a, specimen thickness W, or a unit length (e.g., 1 mm).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Constraint Assessment for Cruciform Specimens With a Semi-Elliptical Crack

Cao¹,

Qian

Yang³

et al. 2018

Volume 6A: Materials and Fabrication

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A real crack to be assessed in a RPV is generally a shallow crack subjected to biaxial far-field stresses. However, the fracture toughness Kc or Jc, which is an important material property for the structural integrity assessment of RPV containing cracks, are usually tested on deep cracked compact tension [C(T)] or single-edged bending [SE(B)] specimens under uniaxial loading. The fracture toughness data do not reflect the realistic biaxial loading state that the cracks are subjected to. Cruciform bending [CR(B)] specimen is therefore developed to simulate the biaxial stress state. In this paper, a series of finite element (FE) simulations of the CR(B) specimens containing different semi-elliptical cracks are conducted. Stress-strain curves of materials of different yield strength and hardening behavior reflecting the variation in the mechanical properties of RPV steels due to aging or temperature change are implemented into the finite element models. The J-A2 theory is applied to analyze the crack tip constraint. The results show that the biaxial effect is material property dependent and affected by load levels.

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Section: Constraint Analysis With J-a 2 Methodssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Constraint Assessment for Cruciform Specimens With a Semi-Elliptical Crack

Cao¹,

Qian

Yang³

et al. 2018

Volume 6A: Materials and Fabrication

View full text Add to dashboard Cite

show abstract

“…developed a medium scale CRB specimens (2T) made of the same steel. In addition, Jörg et al (Hohe et al, 2011). studied that the biaxial effects observed on large scale CRB specimen could be reproduced in the small-scale specimen.…”

Section: Introductionmentioning

confidence: 99%

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

Qian

Cao²,

Niffenegger

et al. 2018

European Journal of Mechanics - A/Solids

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“…Joyce et al [2] developed a medium scale CR(B) specimens (50 Â 50 mm 2 cross section) made of the same steel. More recently, Hohe et al [3] showed that the biaxial effects observed on large-scale CR(B) specimen could be reproduced in the smallscale CR(B) specimen (10 Â 20 mm 2 cross section). Joyce et al [4] summarized the database of several RPV materials tested with both biaxial-and uniaxial-loaded specimens to study the effect of biaxial loading on the master curve transition temperature.…”

Section: Introductionmentioning

confidence: 99%

Constraint Assessment for Specimens Tested Under Uniaxial and Biaxial Loading Conditions

Cao

Qian

Yang

et al. 2018

Journal of Pressure Vessel Technology

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In structural integrity analysis of reactor pressure vessels (RPVs), a postulated shallow crack is subjected to biaxial far-field stresses. However, the fracture toughness Kc or Jc, which is an important material property for the structural integrity assessment of RPVs, is usually obtained from testing deeply cracked compact tension (C(T)) or single-edged bending (SE(B)) specimens under uniaxial loading. Thus, the fracture toughness data do not reflect the biaxial loading state that cracks in a RPV are subjected to. Cruciform bending specimen was therefore developed to simulate the biaxial stress state. In this paper, a series of finite element (FE) simulations of the cruciform specimens containing different crack geometries and of different material properties are conducted. The crack tip stress fields are analyzed, and the constraint is investigated using the J–A2 theory. The results show that the biaxial effect is material property dependent which could be useful for the optimization of the test method and the better design of cruciform specimens. The trends about the biaxial loading effect revealed in this study would also be helpful in estimating the safe operating life of RPVs.

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Enhanced fracture assessment under biaxial external loads using small scale cruciform bending specimens

Cited by 10 publications

References 12 publications

Constraint Assessment for Cruciform Specimens With a Semi-Elliptical Crack

Constraint Assessment for Cruciform Specimens With a Semi-Elliptical Crack

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

Constraint Assessment for Specimens Tested Under Uniaxial and Biaxial Loading Conditions

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