Notch effect and fracture load predictions of rock beams at different temperatures using the Theory of Critical Distances

Justo, Juan B.; Castro, José Villaverde; Cicero, Sergio

doi:10.1016/j.ijrmms.2019.104161

Cited by 29 publications

(37 citation statements)

References 45 publications

(68 reference statements)

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“…Similar results were obtained on different type of rocks such as Carrara marble. 52 More recently, Justo et al 53 analyzed the fracture behavior of rocks subjected to Mode I loads in different temperature conditions. Interestingly, temperature influenced material toughness but had not clear effect on critical distance.…”

Section: Applications Of Tcdmentioning

confidence: 99%

Theory of critical distances: A discussion on concepts and applications

Delprete

Maggio

Sesana

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Theory of Critical Distances (TCD) collects several methods adopted in failure prediction of components provided with stress concentration features. The idea of evaluating stress effect in a zone rather than in a single point was proposed decades ago but, only thanks to relatively recent works, TCD concepts showed to be a successful extension of Linear Elastic Fracture Mechanics (LEFM), able to assess strength and fatigue life. The increasing computational power has made Finite Element Method (FEM) widespread, hence stress fields can be easily extracted and used as input data for fatigue post-processing and durability analyses. In this scenario, TCD reveals as a powerful tool which, thanks to the introduction of a single material parameter (critical distance, [Formula: see text]), integrates classical fracture models by considering the presence of microscale phenomena acting in fracture process. In this sense, TCD behaves as a link between continuum mechanics and LEFM. Modalities and reasons for this connection to occur are interesting points of further investigations. Literature on TCD and its theoretical-experimental background is quite extended, nevertheless few industrial applications are available in literature to the best of authors’ knowledge. In this paper, an overview of concepts and applications related to TCD are reported highlighting the relevance of theoretical arguments in actual applications.

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Section: Applications Of Tcdmentioning

confidence: 99%

Theory of critical distances: A discussion on concepts and applications

Delprete

Maggio

Sesana

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…In any case, the NMC only applies one of the notch corrections provided by the TCD to the fracture toughness obtained in cracked conditions, with the particularity of using the MC for the estimation of the fracture toughness. Given that the validity of the MC (e.g., [1][2][3][4]16,17]) and the TCD corrections (e.g., [6][7][8][9][10][11][12][13][14][15]) is widely reported in the literature, there are no major theoretical issues when applying this methodology. Its main difficulty is the amount of experimental work required for a complete description of the NMC, as this requires defining not only T 0 , but also the values of L throughout the DBTZ.…”

Section: The Ductile-to-brittle Transition Zone In Notched Conditionsmentioning

confidence: 99%

“…As a result, the apparent fracture toughness of ferritic steels containing notches can be much higher than the fracture toughness developed in cracked conditions, and the corresponding load-bearing capacity of the structural components may also be considerably larger. The sensitivity of a particular material to this notch effect is not evident beforehand, with materials developing intense notch effects from very small notch radii (e.g., [9,10]), and materials with negligible notch effects (i.e., notches behaving like cracks) even for significant notch radii (e.g., [11,12]). In any case, assuming that the fracture behavior of ferritic steels containing notches and operating within the DBTZ is the same as that developed in cracked conditions is generally an over-conservative practice, and a specific tool is required for a better definition of a material's fracture behavior under such circumstances.…”

Section: Introductionmentioning

confidence: 99%

Dealing with the Fracture Ductile-to-Brittle Transition Zone of Ferritic Steels Containing Notches: On the Applicability of the Master Curve

Cicero

Arrieta

2021

Metals

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Characterizing the fracture resistance of ferritic steels operating within their Ductile-to-Brittle Transition Zone (DBTZ) has been successfully addressed through the development of the well-known Master Curve (MC). This tool assumes that fracture, in the presence of crack-like defects, is controlled by weakest-link statistics and follows a three-parameter Weibull distribution. When dealing with notch-type defects, there is no standardized solution to predict the fracture resistance within the DBTZ, but the authors have published some works demonstrating that the MC can also be applied in different ways to characterize ferritic steels containing notches. One of these ways is the direct application of the MC methodology, providing a specific reference temperature (T0N) for each material and notch radius. This work reviews this initial attempt to apply the MC in notched conditions, assessing the validity of the main MC hypotheses (initially valid for cracked conditions) when analyzing notch-type defects and providing experimental validation on steels S275JR, S355J2, S460M and S690Q.

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“…ere are many engineering structure fractures due to thermal load. In recent years, the international rock mechanics field has considered temperature as an important factor affecting rock mechanical properties [1,2]. erefore, some research has been done on the influence of temperature on rock strength and fracture toughness [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effect of T-stress on Fracture of a Long Cracked Plate in Unsteady Heat Transfer

Zhou

2021

Mathematical Problems in Engineering

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In order to accurately predict the structure fracture caused by thermal load, a modified maximum tensile stress (MTS) criterion combined with T-stress is proposed. The modified MTS uses a two-parameter model (stress intensity factor K and T-stress) to describe the fracture behavior under thermal load. The T-stress and stress intensity factor at the crack tip are solved by using J-integral in the theoretical calculation of a cracked strip with temperature difference. The results show that T-stress can affect the fracture toughness and the stress at the crack tip of the cracked strip with temperature difference. This provides a basis for the simulation of structural fracture under thermal load.

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Notch effect and fracture load predictions of rock beams at different temperatures using the Theory of Critical Distances

Cited by 29 publications

References 45 publications

Theory of critical distances: A discussion on concepts and applications

Theory of critical distances: A discussion on concepts and applications

Dealing with the Fracture Ductile-to-Brittle Transition Zone of Ferritic Steels Containing Notches: On the Applicability of the Master Curve

Effect of T-stress on Fracture of a Long Cracked Plate in Unsteady Heat Transfer

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