Fracture toughness for CNT specimens from numerically obtained critical CTOD values

Feng Wei Wu; Raafat Nasr Ibrahim; Rajarshi Das; Raman Raghuvir Kumar Singh

doi:10.1016/j.tafmec.2009.06.003

Fracture toughness for CNT specimens from numerically obtained critical CTOD values

Feng Wei Wu, Raafat Nasr Ibrahim, Rajarshi Das, Raman Raghuvir Kumar Singh

Research output: Contribution to journal › Article › Research › peer-review

13 Citations (Scopus)

Abstract

Many approaches for estimating mode I fracture toughness (KIC) using circumferentially notched tensile (CNT) specimen have been demonstrated in the literature. In this paper, an effective approach for estimating fracture toughness from the numerical solution of critical crack tip opening displacement (CTOD) is proposed. An elasto-plastic finite element analysis is used to estimate critical CTOD values for CNT specimens. A number of materials are analysed, and the relationship between KIC and critical CTOD for CNT specimens is obtained. The proposed relationship is validated by comparing the fracture toughness values obtained from the relationship with those obtained experimentally using CNT specimens. The fracture toughness (KIC) calculated according to this relationship from numerically obtained critical CTOD is found to be in close agreement with the experimentally obtained fracture toughness for the respective materials.

Original language	English
Pages (from-to)	50 - 54
Number of pages	5
Journal	Theoretical and Applied Fracture Mechanics
Volume	52
Issue number	1
DOIs	https://doi.org/10.1016/j.tafmec.2009.06.003
Publication status	Published - 2009

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10.1016/j.tafmec.2009.06.003

Cite this

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title = "Fracture toughness for CNT specimens from numerically obtained critical CTOD values",

abstract = "Many approaches for estimating mode I fracture toughness (KIC) using circumferentially notched tensile (CNT) specimen have been demonstrated in the literature. In this paper, an effective approach for estimating fracture toughness from the numerical solution of critical crack tip opening displacement (CTOD) is proposed. An elasto-plastic finite element analysis is used to estimate critical CTOD values for CNT specimens. A number of materials are analysed, and the relationship between KIC and critical CTOD for CNT specimens is obtained. The proposed relationship is validated by comparing the fracture toughness values obtained from the relationship with those obtained experimentally using CNT specimens. The fracture toughness (KIC) calculated according to this relationship from numerically obtained critical CTOD is found to be in close agreement with the experimentally obtained fracture toughness for the respective materials.",

author = "Wu, {Feng Wei} and Ibrahim, {Raafat Nasr} and Rajarshi Das and Singh, {Raman Raghuvir Kumar}",

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T1 - Fracture toughness for CNT specimens from numerically obtained critical CTOD values

AU - Wu, Feng Wei

AU - Ibrahim, Raafat Nasr

AU - Das, Rajarshi

AU - Singh, Raman Raghuvir Kumar

PY - 2009

Y1 - 2009

N2 - Many approaches for estimating mode I fracture toughness (KIC) using circumferentially notched tensile (CNT) specimen have been demonstrated in the literature. In this paper, an effective approach for estimating fracture toughness from the numerical solution of critical crack tip opening displacement (CTOD) is proposed. An elasto-plastic finite element analysis is used to estimate critical CTOD values for CNT specimens. A number of materials are analysed, and the relationship between KIC and critical CTOD for CNT specimens is obtained. The proposed relationship is validated by comparing the fracture toughness values obtained from the relationship with those obtained experimentally using CNT specimens. The fracture toughness (KIC) calculated according to this relationship from numerically obtained critical CTOD is found to be in close agreement with the experimentally obtained fracture toughness for the respective materials.

AB - Many approaches for estimating mode I fracture toughness (KIC) using circumferentially notched tensile (CNT) specimen have been demonstrated in the literature. In this paper, an effective approach for estimating fracture toughness from the numerical solution of critical crack tip opening displacement (CTOD) is proposed. An elasto-plastic finite element analysis is used to estimate critical CTOD values for CNT specimens. A number of materials are analysed, and the relationship between KIC and critical CTOD for CNT specimens is obtained. The proposed relationship is validated by comparing the fracture toughness values obtained from the relationship with those obtained experimentally using CNT specimens. The fracture toughness (KIC) calculated according to this relationship from numerically obtained critical CTOD is found to be in close agreement with the experimentally obtained fracture toughness for the respective materials.

U2 - 10.1016/j.tafmec.2009.06.003

DO - 10.1016/j.tafmec.2009.06.003

M3 - Article

SN - 0167-8442

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EP - 54

JO - Theoretical and Applied Fracture Mechanics

JF - Theoretical and Applied Fracture Mechanics

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