Coefficients of the crack tip asymptotic field for wedge splitting specimens

2003 ◽  
Vol 70 (17) ◽  
pp. 2407-2420 ◽  
Author(s):  
B.L. Karihaloo ◽  
H. Abdalla ◽  
Q.Z. Xiao
Keyword(s):  
Crack Tip ◽  
Asymptotic Field ◽  
Crack Tip Asymptotic Field ◽  
Wedge Splitting

Evaluation of the Higher Order Terms of the Wedge-Splitting Specimen Based on the SBFEM

2013 ◽  
Vol 477-478 ◽  
pp. 25-29 ◽  
Author(s):  
Feng Lin Xu ◽  
Jun Yu Liu ◽  
Bao Kuan Ning ◽  
He Fan
Keyword(s):  
Radial Direction ◽  
High Accuracy ◽  
Higher Order ◽  
Asymptotic Field ◽  
Crack Tip Asymptotic Field ◽  
Higher Order Terms ◽  
T Stress ◽  
Crack Stability ◽  
Scaled Boundary Finite Element ◽  
Wedge Splitting

The scaled boundary finite element method (abbr. SBFEM) is a semi-analytical method developed by Wolf and Song. The analytical advantage of the solution in the radial direction allows SBFEM converge to the Williams expansion. The coefficients of the Williams expansion, including the stress intensity factor, the T-stress, and higher order terms can be calculated directly without further processing. In the paper the coefficients of higher order terms of the crack tip asymptotic field of typical wedge splitting specimens with two different loading arrangements are evaluated using SBFEM. Numerical results show the method has high accuracy and effectiveness. The results have certain significance on determining crack stability of the wedge-splitting specimen.

Deterministic Prediction of Stress Corrosion Crack Growth Rates in High Temperature Water by Combination of Interface Oxidation Kinetics and Crack Tip Asymptotic Field

2008 ◽  
Author(s):  
Tetsuo Shoji ◽  
Zhanpeng Lu ◽  
Yoichi Takeda ◽  
Hiroyoshi Murakami ◽  
Chaoyang Fu
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Crack ◽  
Crack Growth ◽  
Oxidation Kinetics ◽  
Crack Tip ◽  
Asymptotic Field ◽  
Light Water ◽  
Crack Tip Asymptotic Field ◽  
Crack Growth Rates ◽  
Stress Corrosion Crack Growth

Proper disposition of the environmentally assisted crack growth rate in terms of key engineering parameters is crucial for safe and economic long term operation of light water reactors. Accurately predicting stress corrosion crack growth rate requires the quantification of crack tip mechanics, crack tip oxidation kinetics and their interactions. Crack tip strain rate has been categorized as a fundamental parameter for stress corrosion cracking of austenitic alloys in light water reactor environments. Continuum mechanics is applied to quantify crack tip strain rate based on the crack tip asymptotic field. A general oxidation kinetics formulation is proposed based on solid state mass transport theory. Stress corrosion crack growth rates of austenitic alloys in high temperature water environments are formulated as a function of various engineering parameters by combination of interface oxidation kinetics and the crack tip asymptotic field. Recent experimental results of stress corrosion crack growth rates in simulated boiling water reactor and pressurized water reactor environments are analyzed and reflected in the model development and application. The importance of surface integrity on plant safety is emphasized. The plant material aging management methodology is applied to the recent cracking issues in light water reactors.

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

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.

Combination of Wedge Splitting and Bending Fracture Test-Crack Tip Stress Field and Nonlinear Zone Extent Analysis

2014 ◽  
Vol 969 ◽  
pp. 67-72 ◽  
Author(s):  
Jakub Sobek ◽  
Václav Veselý ◽  
Stanislav Seitl
Keyword(s):  
Numerical Study ◽  
Process Zone ◽  
Crack Tip ◽  
Stress Distributions ◽  
Fracture Test ◽  
Three Point Bending ◽  
Test Geometry ◽  
Configuration Changes ◽  
Bending Fracture ◽  
Wedge Splitting

The paper is focused on a numerical study of fracture test of quasi-brittle materials which is a combination of both the wedge splitting and the three-point bending configuration. Changes in some parameters of the test geometry lead to variations in constraint conditions at the crack tip, which affects the extent of the fracture process zone, i.e. the volume where the crucial processes, determining the possibility and extent of the failure take place. Differences indicated by the failure extents (expressed as the crack pattern) and stress distributions are plotted for several stages of loading for the proposed fracture test configurations.

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