Estimation of the Fracture Toughness of Structural Steels by Means of the CTOD Evaluation on Notched Small Punch Specimens

García, T.E.; Rodríguez, Celestino; Belzunce, F. J.; Peñuelas, I.; Cuesta, I.I.

doi:10.1016/j.mspro.2014.06.140

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…The average J integrals of the BM and the WZ under hydrogen-free conditions were determined to be 571.4 and 364.4 kJ/m 2 , respectively. Previous investigations have shown that the critical fracture toughness J IC estimated following the ASTM E1820 standard in 2.25Cr-1Mo-0.25V steel is 555 kJ/m 2 [ 22 , 23 ], which is consistent with the present results. On the other hand, the presence of dissolved hydrogen leads to a significant reduction of fracture toughness.…”

Section: Resultssupporting

confidence: 92%

Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing

Song

Chai

et al. 2018

Materials

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Hydrogen embrittlement (HE) is a critical issue that hinders the reliability of hydrogenation reactors. Hence, it is of great significance to investigate the effect of hydrogen on fracture toughness of 2.25Cr-1Mo-0.25V steel and weld. In this work, the fracture behavior of 2.25Cr-1Mo-0.25V steel and welds was studied by three-point bending tests under hydrogen-free and hydrogen-charged conditions. The immersion charging method was employed to pre-charge hydrogen inside specimen and the fracture toughness of these joints was evaluated quantitatively. The microstructure and grain size of the specimens were observed by scanning electron microscopy (SEM) and by metallurgical microscopy to investigate the HE mechanisms. It was found that fracture toughness for both the base metal (BM) and the weld zone (WZ) significantly decreased under hydrogen-charged conditions due to the coexistence of the hydrogen-enhanced decohesion (HEDE) and hydrogen-enhanced localized plasticity (HELP) mechanisms. Moreover, the formation and growth of primary voids were observed in the BM, leading to a superior fracture toughness. In addition, the BM compared to the WZ shows superior resistance to HE because the finer grain size in the BM leads to a larger grain boundary area, thus distributing more of the diffusive hydrogen trapped in the grain boundary and reducing the hydrogen content.

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Section: Resultssupporting

confidence: 92%

Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing

Song

Chai

et al. 2018

Materials

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“…33 When developing a new correlation minimizing the scatter is important as scatter bands that are too wide make it difficult if not impossible to determine material properties. 90 The results from thinner specimens require additional corrections to be representative of bulk material. 79 If full size specimens were manufactured in a way that resulted in anisotropy between outer surface and the centre of the specimen, testing SPT specimens cut as slices from the gauge section of the standard specimens did not result in the same material properties as standard specimens.…”

Section: Tensile Testingmentioning

confidence: 99%

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Kazakeviciute

Rouse

Focatiis

et al. 2021

The Journal of Strain Analysis for Engineering Design

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Small specimen mechanical testing is an exciting and rapidly developing field in which fundamental deformation behaviours can be observed from experiments performed on comparatively small amounts of material. These methods are particularly useful when there is limited source material to facilitate a sufficient number of standard specimen tests, if any at all. Such situations include the development of new materials or when performing routine maintenance/inspection studies of in-service components, requiring that material conditions are updated with service exposure. The potentially more challenging loading conditions and complex stress states experienced by small specimens, in comparison with standard specimen geometries, has led to a tendency for these methods to be used in ranking studies rather than for fundamental material parameter determination. Classifying a specimen as ‘small’ can be subjective, and in the present work the focus is to review testing methods that utilise specimens with characteristic dimensions of less than 50 mm. By doing this, observations made here will be relevant to industrial service monitoring problems, wherein small samples of material are extracted and tested from operational components in such a way that structural integrity is not compromised. Whilst recently the majority of small specimen test techniques development have focused on the determination of creep behaviour/properties as well as sub-size tensile testing, attention is given here to small specimen testing methods for determining specific tensile, fatigue, fracture and crack growth properties. These areas are currently underrepresented in published reviews. The suitability of specimens and methods is discussed here, along with associated advantages and disadvantages.

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“…Noguera and Miró [1] determined an asphalts toughness by means of tensile test to relate it with the fatigue test results. García et al, [2] used the fracture toughness of advanced high strength steels (AHSS) to optimize the crash behaviour of structural components. In [3], Gutierrez et al, proposed a new methodology for estimating the fracture toughness by means of Small Punch Test specimens with a longitudinal non-trough notch, which was tested on a 2.25Cr1Mo0.25V steel.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical evaluation of resilience and toughness in AISI 1015 steel welded plates

Zaldivar-Almaguer

Estrada-Cingualbres

Pérez‐Rodríguez

et al. 2019

Rev.Fac.Ing.Univ.Antioquia

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The mechanical characterization of the engineering materials is always a topic of interest to engineers and researchers. The objective of this work is to study the butt welded joint resilience and toughness by means of the tensile test and the numerical simulation. The specimens were fabricated by welding two plates of AISI 1015 steel with an E6013 electrode. An algorithm of the numerical integration based on the trapezoid method that allowed calculating the resilience and toughness as the area under the stress - strain curve was implemented. The algorithm was validated by comparing the numerical results of the resilience with those obtained by the analytical method. The results show that the resilience and the toughness values computed with the experimental stress - strain curve, they have correspondence with the same values calculated with the numerical simulation.

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Estimation of the Fracture Toughness of Structural Steels by Means of the CTOD Evaluation on Notched Small Punch Specimens

Cited by 13 publications

References 10 publications

Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing

Experimental Investigation of the Effect of Hydrogen on Fracture Toughness of 2.25Cr-1Mo-0.25V Steel and Welds after Annealing

Small specimen techniques for estimation of tensile, fatigue, fracture and crack propagation material model parameters

Experimental and numerical evaluation of resilience and toughness in AISI 1015 steel welded plates

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