Verification of effective thicknesses for side-grooved compact specimens

Shivakumar, Kunigal; Newman, James C.

doi:10.1016/0013-7944(92)90125-x

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…An abrupt increase in J close to the side groove (21z[/BN ~ 1) was evident in the results from both the stationary and growing analysis, which is in agreement with other investigations of side grooved CT specimens (cfLorenzi and Shih [34] and Shivakumar and Newman [35]). One should note that at this load level the condition (2) is slightly violated (Aa/bo ~ 11%) and the near tip field, of order J/cry, is a sizeable fraction of the remaining ligament (bcrv/J ~ 4.5).…”

Section: A Comparison Between Jd and If For A Ct-specimensupporting

confidence: 91%

An experimental and numerical investigation of ductile crack growth characteristics in surface cracked specimens under combined loading

Faleskog

1994

Int J Fract

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Fracture mechanics tests have been performed in the upper shelf region of a steel on large surface cracked plate (SCT) specimens and on small compact tension (CT) specimens. Some of the SCT specimens were subjected to combined tension and bending in such a way that the loading was strongly non-proportional. Crack growth characteristics were compared between the specimens in order to assess possible influences of geometry and nonproportional loading. The differences observed could unambiguously be reduced to and correlated with differences in constraint. Constraint parameters were evaluated by detailed three-dimensional finite element computations and quantities for growing cracks were interpreted on the basis of deformation theory considerations, in analogy with the commonly used Jn-philosophy. It was noted that the initiation of ductile crack growth along a threedimensional crack front appears to be independent of the degree of local constraint. However, the increase in toughness for a growing crack was markedly affected by the degree of local constraint. Some estimates of the constraints effects regarding stability considerations were also made.

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Section: A Comparison Between Jd and If For A Ct-specimensupporting

confidence: 91%

An experimental and numerical investigation of ductile crack growth characteristics in surface cracked specimens under combined loading

Faleskog

1994

Int J Fract

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“…This increase is of the order of 32%. The same qualitative results for the CT specimen were also reported in [18,19], although the variations of the KI for their 25% grooved specimen were much smaller. This difference can be attributed to the difference in the depth of side grooves (BNI B) which is equal to 0.75 for the CT specimen but is as high as 0.4 for the T-DCB specimen discussed here.…”

Section: Resultssupporting

confidence: 79%

A Tapered Double-Cantilever-Beam Specimen Designed for Constant-KTesting at Elevated Temperatures

Petersen¹,

Link

Bereś

et al. 1997

Journal of Testing and Evaluation

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A compact, constant stress intensity factor, side grooved, tapered double-cantilever-beam (T-DCB) specimen has been designed for measuring elevated temperature creep and fatigue crack growth rates. This specimen is much smaller than the standard DCB specimen generally used for studying corrosion fatigue in airframe materials and it can be ea.~ily accommodated in standard furnaces generally used in elevated-temperature fracture mechanics testing. The specimen possesses a constant-K region of 30 mm. This constant-K crack length range was first established analytically through detailed two-and three-dimensional finite-element analyses and the finite-element calculations were further verified experimentally through quantitative fractographic analysis using the striation measurement technique.

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“…Therefore, the crack extension can maintain the straight state of specimen with side grooves because the introduction of side grooves can be regarded as plane strain conditions approximately [32,33]. Some scholars have investigated the effect of side grooves in single-edge bending and compact tension specimens on elastic compliance [32,34], stress intensity factor [32], J-integral and cracktip constraint by numerical simulation and experimental investigation. The difference between the compliance of a specimen without side grooves and that of a specimen with side grooves (for B-B N < 0.25B) is less than 6% based on the numerical simulation method.…”

Section: Introductionmentioning

confidence: 99%

Stress Triaxial Constraint and Fracture Toughness Properties of X90 Pipeline Steel

Wang

Hao²,

Xie³

et al. 2022

Metals

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The X90 pipeline steel with high-strength and high-toughness become the most popular pipeline steel. Due to the stress triaxial constraint and fracture toughness properties are the key factors for the stable work of pipeline steel, the research on the fracture toughness of X90 is a great significance to promote the engineering application of high-strength pipeline steel. In order to investigate the stress triaxial constraint and fracture toughness properties of X90 pipeline steel, the experimental rules with different grooves size are proposed using the common toughness experiment and the corresponding numerical models are established in this paper. The resistance curves and fracture toughness of each type of specimens are obtained and compared with that of finite element analysis. Furthermore, the stress distribution, J-integral distribution and stress triaxial constraint of the specimen are analyzed, as well as the influence of side grooves size on the determination of fracture toughness is also discussed. The results obtained from the study will provide a reference to the fracture toughness evaluation research and application of X90 pipeline steel.

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Verification of effective thicknesses for side-grooved compact specimens

Cited by 10 publications

References 8 publications

An experimental and numerical investigation of ductile crack growth characteristics in surface cracked specimens under combined loading

An experimental and numerical investigation of ductile crack growth characteristics in surface cracked specimens under combined loading

A Tapered Double-Cantilever-Beam Specimen Designed for Constant-KTesting at Elevated Temperatures

Stress Triaxial Constraint and Fracture Toughness Properties of X90 Pipeline Steel

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