Three-dimensional finite element analyses of T -stress for different experimental specimens

Miao, Xin-Ting; Zhou, Changyu; Lv, Fei; He, Xin

doi:10.1016/j.tafmec.2017.04.018

Cited by 15 publications

(6 citation statements)

References 26 publications

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“…SIFs and T-stress components can be evaluated by boundary collocation method and finite element method for different specimens with various geometries. 4,31,[33][34][35][36][37] Three-dimensional finite element method is adopted to analyze SIFs and T-stress components for CCP and CTS specimens, parameter settings under compression refer to our previous paper. 31 Based on our previous work, the wedge-shaped mesh element at crack tip and linear reduced integral three-dimensional element C3D8R are selected in ABAQUS software.…”

Section: Fracture Criterion Considering T-stressmentioning

confidence: 99%

“…Besides, the connection mode between CTS specimen and fixture with finite element method is referred to our group's contribution in references. 4,38…”

Section: Fracture Criterion Considering T-stressmentioning

confidence: 99%

“…As a constraint parameter, T-stress can be employed to reduce the conservatism of fracture toughness assessment, 1 which has the influence on critical kinking angle and apparent fracture toughness of material. 2 In addition, T-stress has a significant influence on the size and shape of plastic zone ahead of crack tip, 3,4 as well as crack propagation path [4][5][6] and crack propagation model. 7 The commonly used fracture criteria mainly include maximum tangential stress (MTS) criterion, minimum strain energy density (MSED) criterion, and maximum energy release rate (MERR) criterion.…”

Section: Introductionmentioning

confidence: 99%

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Crack initiation characteristics of brittle materials with I‐II mixed mode crack under uniaxial compression

Jin

Zhou

et al. 2022

Fatigue Fract Eng Mat Struct

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Considering T-stress components under compression, the crack initiation characteristics of HT200 and PMMA under uniaxial compression have been investigated by theoretical analysis and experimental study for central cracked plate (CCP) and compact tension shear (CTS) specimens with I-II mixed mode crack. Crack initiation angles of CCP and CTS specimens under compressive load were theoretical predicted according to modified maximum tangential stress (MMTS) criterion and modified maximum shear stress (MMSS) criterion. The influence of material parameters and specimen geometrical configurations on crack initiation characteristics was illustrated through experiments. It demonstrates that the modified fracture criterion considering T-stress components is more consistent with experiments. Crack initiation angle is related to material properties. Limit load P L is controlled by K II under compression for CCP specimen, and P L of PMMA is less than that of HT200. The closure effect on CTS specimens is less significant than that on CCP specimens.

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Section: Fracture Criterion Considering T-stressmentioning

confidence: 99%

“…Besides, the connection mode between CTS specimen and fixture with finite element method is referred to our group's contribution in references. 4,38…”

Section: Fracture Criterion Considering T-stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Crack initiation characteristics of brittle materials with I‐II mixed mode crack under uniaxial compression

Jin

Zhou

et al. 2022

Fatigue Fract Eng Mat Struct

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“…The differences between σxx stress fields can be described by the constraint parameter Tstress. The dimensionless parameter B (𝐵 = √ ) [24] is used in this paper; the values of B for K1 specimens are 0.45 and for K3 specimens are 0.23. So, the constraint of the K1 specimen is higher than that of the K3 specimen.…”

Section: Constraint Ahead Of Crack Tipmentioning

confidence: 99%

Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method

Miao

Hong

et al. 2022

Metals

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Mechanical behaviors at fatigue crack tips of cracked specimens under negative loading ratios are studied in detail by the finite element method in this paper. Three factors induced by specimen type and loading type on fatigue crack field are discussed, including constraint, compressive loading effect (CL effect) and crack contact closure. For mode I crack under negative loading ratios, the effects of the CL effect and crack contact closure on plastic strain accumulations are dominant, with the constraint effect being minor. The constraint effect has effects on the monotonous plastic zone, while the CL effect and contact closure both have effects on the reversed plastic zone (RPZ) and residual tensile plastic zone (RTPZ). That is, the higher the constraint, the smaller the size of the monotonous plastic zone; the greater the CL effect, or the smaller the contact degree, the larger the size of RPZ and RTPZ. For mode II crack, there is only CL effect on the crack tip field without the effect of constraint and contact closure, so plastic strain accumulation at the mode II crack tip is much greater than that at the mode I crack tip when they are under the same loading level.

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“…T-stress affects the plastic zone [7] and propagation direction [8]. A negative T-stress stabilizes the fracture path, which means that a minor disruption in the crack path is soon attenuated, whereas a positive T-stress emphasizes deviations, and crack initiation angle [9]. Miao et al [10] evaluated the role of T-stress on crack initiation and crack bottom plasticity through 3D finite element analysis of three specimens: CCP, CTS, and FPB.…”

Section: Introductionmentioning

confidence: 99%

An Isogeometric Over-Deterministic Method (IG-ODM) to Determine Elastic Stress Intensity Factor (SIF) and T-Stress

Yakoubi,

Elkhalfi,

Moustabchir

et al. 2023

Mathematics

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In order to examine the significance of Stress Intensity Factor and T-stress (K-T parameters) in modeling pressure-cracked structures, we propose a novel method known as the Isogeometric Over-Deterministic Method IG-ODM. IG-ODM utilizes the computation of stress and displacement fields through Extended Isogeometric Analysis to improve the geometry and enhance the crack. Subsequently, these results are incorporated into the Williams expression, resulting in a set of deterministic equations that can be solved using a common solving method; this particular combination has never been attempted before. IG-ODM enables the computation of stress intensity factor SIF, T-stress, and higher-order parameters in the Williams expansion. To validate the effectiveness of this method, we conducted tests on a single-edge uniaxial-stress-cracked plate and a central uniaxial-stress-cracked plate. The results showed an error ranging from 0.06% to 2%. The obtained results demonstrate accuracy and satisfaction when compared to existing findings.

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Three-dimensional finite element analyses of T -stress for different experimental specimens

Cited by 15 publications

References 26 publications

Crack initiation characteristics of brittle materials with I‐II mixed mode crack under uniaxial compression

Crack initiation characteristics of brittle materials with I‐II mixed mode crack under uniaxial compression

Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method

An Isogeometric Over-Deterministic Method (IG-ODM) to Determine Elastic Stress Intensity Factor (SIF) and T-Stress

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