Two-parameter fracture mechanical analysis of a near-crack-tip stress field in wedge splitting test specimens

Two parameter fracture mechanics uses for description of the crack tip stress fields, not only the stress intensity factor (SIF), but the second term of Williams expansion the T-stress. In the paper, the SIF and T-stress of typical wedge splitting specimens with usual loading arrangements varying in the wedge angle are directly computed using ANSYS finite element software. The influence of the wedge angle value is quantified.

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Numerical Stress Analysis of the Biaxial Tension-Compression Wedge-Splitting Test in Vicinity of the Crack Tip

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.784.85 ◽

2018 ◽

Vol 784 ◽

pp. 85-90

Author(s):

Stanislav Seitl ◽

Petr Miarka ◽

Ildikó Merta ◽

Zbyněk Keršner

Keyword(s):

Stress Analysis ◽

Mechanical Test ◽

Biaxial Tension ◽

Crack Tip ◽

Biaxial Stress ◽

Stress Fields ◽

Wedge Splitting Test ◽

Splitting Test ◽

Compression Wedge ◽

Wedge Splitting

Wedge-splitting test is widely used fracture mechanical test for its stability in measurement during the testing and many papers were published. However, the biaxial wedge-splitting test is relatively a new method and the numerical stress analysis of such test is necessary. Especially the investigation of the stress fields in the vicinity of the crack tip. In this contribution, influence of various biaxial stress level is discussed on values of first and second terms of William’s expansion.

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Nonuniform ferroelastic domain switching driven by two-parameter crack tip stress field

Engineering Fracture Mechanics ◽

10.1016/j.engfracmech.2012.08.003 ◽

2012 ◽

Vol 96 ◽

pp. 226-240 ◽

Cited By ~ 6

Author(s):

Yuanqing Cui ◽

Zheng Zhong

Keyword(s):

Stress Field ◽

Domain Switching ◽

Crack Tip ◽

Two Parameter ◽

Crack Tip Stress

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Analytical Approximation of Crack-Tip Stress Field: Study on Efficient Determination of Coefficients of Higher Order Terms of Williams Power Expansion

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.713.207 ◽

2016 ◽

Vol 713 ◽

pp. 207-211 ◽

Cited By ~ 1

Author(s):

Jakub Sobek ◽

Petr Frantik ◽

Václav Veselý

Keyword(s):

Stress Field ◽

Crack Tip ◽

Analytical Approximation ◽

Crack Tip Field ◽

Wedge Splitting Test ◽

Splitting Test ◽

Higher Order Terms ◽

Parameter Approximation ◽

Selection Of

The paper presents a study on accuracy of the multi-parameter approximation of the stress field in a cracked body using Williams power series calibrated according to results of FEM computation. Main attention is paid to a detailed analysis of suitable selection of FE nodes, whose results serve as inputs to the over-deterministic method (ODM) employed for determination of the coefficients of terms of the Williams expansion describing the crack-tip field. Two different ways of FE nodal selection are compared – nodes selected from the crack tip vicinity versus nodes selected from a specific part of the test specimen body in a specific way. Comparison is made with the usage of the authors’ own developed procedures enabling both the determination of the coefficients of the analytical approximation of stress field based on the FE results and the backward reconstruction of the field from those determined terms’ coefficients/functions. The wedge-splitting test (WST) specimen with a crack is taken as example for the study.

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