Development of a new methodology for estimating the CTOD of structural steels using the small punch test

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

doi:10.1016/j.engfailanal.2015.01.011

Cited by 21 publications

(15 citation statements)

References 20 publications

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“…Moreover, although progress has been made in its micromachining, the notch tip radius is still significantly blunted as compared to a fatigue precrack. Thus, while the final crack always starts at the tip of the notch [14], several microcracks may develop in the vicinity. This latter feature may be particularly relevant in metals with lower fracture toughness, which exhibit brittle behavior in conventional tests.…”

Section: Discussionmentioning

confidence: 99%

“…Other schemes involve the use of neural networks to identify ductile damage parameters [12] or energybased approaches [4]. Recent research efforts have been mainly focused on the development of notched samples with the aim of increasing the attained constraint level [13,14]. The notch acts as a stress concentrator aiming to provide a triaxiality state closer to the standard fracture tests.…”

Section: Introductionmentioning

confidence: 99%

“…The key objectives are: (i) to establish a procedure to classify industrial components as a function of their fracture resistance, and (ii) to set an appropriate correlation with standard tests, enabling a quantitative toughness assessment. A micromechanical damage model is employed to overcome the existing experimental shortcomings and enable the former objective, while the latter goal is facilitated by the use of the notch mouth opening displacement δ SPT as a fracture parameter, inspired by the standard crack tip opening displacement (CTOD) δ [14]. As depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Fracture toughness characterization through notched small punch test specimens

Martínez‐Pañeda

García

Rodríguez

2016

Materials Science and Engineering: A

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In this work a novel methodology for fracture toughness characterization by means of the small punch test (SPT) is presented. Notched specimens are employed and fracture resistance is assessed through a critical value of the notch mouth displacement δ SPT . Finite element simulations and interrupted experiments are used to track the evolution of δ SPT as a function of the punch displacement. The onset of crack propagation is identified by means of a ductile damage model and the outcome compared to the crack tip opening displacement estimated from conventional tests at crack initiation.The proposed numerical-experimental scheme is examined with two different grades of CrMoV steel and the differences in material toughness captured.Limitations and uncertainties arising from the different damage phenomena observed in the lowest toughness material examined are thoroughly discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fracture toughness characterization through notched small punch test specimens

Martínez‐Pañeda

García

Rodríguez

2016

Materials Science and Engineering: A

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“…Attending to the specimen geometry and test setup, quasi-static conditions are assumed and a 3-D approach is adopted, taking advantage of symmetry when possible. As described elsewhere [18,26], 8-node linear brick elements are employed, with the mesh gradually being refined towards the notch, where the characteristic element length is determined from a sensitivity study. The lower matrix, the fixer and the punch are modeled as rigid bodies and their degrees of freedom are restricted except for the vertical displacement of the punch.…”

Section: Resultsmentioning

confidence: 99%

Damage modeling in Small Punch Test specimens

Martínez‐Pañeda

Cuesta

Peñuelas

et al. 2016

Theoretical and Applied Fracture Mechanics

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Ductile damage modeling within the Small Punch Test (SPT) is extensively investigated. The capabilities of the SPT to reliably estimate fracture and damage properties are thoroughly discussed and emphasis is placed on the use of notched specimens. First, different notch profiles are analyzed and constraint conditions quantified. The role of the notch shape is comprehensively examined from both triaxiality and notch fabrication perspectives. Afterwards, a methodology is presented to extract the micromechanical-based ductile damage parameters from the load-displacement curve of notched SPT samples. Furthermore, Gurson-Tvergaard-Needleman model predictions from a top-down approach are employed to gain insight into the mechanisms governing crack initiation and subsequent propagation in small punch experiments. An accurate assessment of micromechanical toughness parameters from the SPT is of tremendous relevance when little material is available.

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“…In the last equation, t0 and tf are the initial and final thickness of the fracture specimen, respectively; see Although good correlations between fracture toughness parameters and SPT data have been found, values of the constants k and J0 constants are distinctive for each material (García, 2015). In the case of structural steels, most of SPT studies have focused on wrought steels, while only a few investigations have concentrated on cast steels, regardless of the brittle nature of these steels.…”

Section: Introductionmentioning

confidence: 99%

Evaluación de la tenacidad a la fractura de anclajes de aceros colados de un puente atirantado por ensayo miniatura de punzonamiento

López-Vargas

Carachéo

Álvarez

et al. 2018

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La evaluación de la vida residual de componentes estructurales en servicio requiere conocer el valor de la tenacidad a la fractura, pero los métodos convencionales para medir la tenacidad demandan remover grandes cantidades de material del componente, lo cual es generalmente impráctico. Sin embargo, el Ensayo Miniatura de Punzonamiento (EMP) (que utiliza especímenes miniatura no estandarizados) ha sido empleado como una alternativa práctica y conveniente para evaluar las características de fractura del material de componentes en servicio. El propósito de esta investigación fue encontrar una relación entre la deformación a la fractura equivalente de EMP ?af y la tenacidad a la fractura JIC de aceros colados de baja aleación procedentes de anclajes de un puente atirantado localizado en el Golfo de México. La tenacidad a la fractura JIC se calculó a partir de los datos experimentales reportados de KIC en un trabajo previo y la deformación a la fractura equivalente se obtuvo mediante el EMP empleando especímenes de 10x10 mm2 por 0.5 mm de espesor. A partir de los resultados de ?af y JIC obtenidos, y correspondientes datos de aceros de baja aleación de la literatura, una correlación lineal fue propuesta para estimar la tenacidad de fractura a partir de la deformación a la fractura equivalente del EMP para los aceros colados pertenecientes a este caso de estudio.

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Development of a new methodology for estimating the CTOD of structural steels using the small punch test

Cited by 21 publications

References 20 publications

Fracture toughness characterization through notched small punch test specimens

Fracture toughness characterization through notched small punch test specimens

Damage modeling in Small Punch Test specimens

Evaluación de la tenacidad a la fractura de anclajes de aceros colados de un puente atirantado por ensayo miniatura de punzonamiento

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