Two Parameter Description of Crack Tip Stress Fields for Wedge Splitting Test Specimen: Influence of Wedge Angle

2014 ◽  
Vol 969 ◽  
pp. 345-350
Author(s):  
Stanislav Seitl ◽  
Carlos Bermejo ◽  
Jakub Sobek ◽  
Václav Veselý
Keyword(s):  
Wedge Angle ◽  
Crack Tip ◽  
Stress Fields ◽  
Finite Element Software ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
T Stress ◽  
Two Parameter ◽  
Crack Tip Stress ◽  
Wedge Splitting

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.

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.

Selecting a Suitable Specimen Shape with Low Constraint Value for Determination of Fracture Parameters of Cementitious Composites

2013 ◽  
Vol 577-578 ◽  
pp. 481-484 ◽  
Author(s):  
Stanislav Seitl ◽  
Sara Korte ◽  
Wouter de Corte ◽  
Veerle Boel ◽  
Jakub Sobek ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Building Materials ◽  
Crack Tip ◽  
Test Configuration ◽  
Three Point Bending ◽  
Finite Element Software ◽  
Splitting Test ◽  
T Stress ◽  
Low Constraint ◽  
Wedge Splitting

The stress intensity factor and the T-stress describing the near-crack-tip fields for selected specimen shapes of a test geometry based on wedge splitting and three point bending tests with several variants of boundary conditions are computed using finite element software ANSYS. The test configuration in question is expected to be a convenient alternative to classical fracture tests (especially the tensile ones) for investigation of the quasi-brittle fracture of building materials, when low constraint is requested. These specimens are investigated within the framework of two-parameter fracture mechanics; near-crack-tip stress field parameters are determined and compared with those of the wedge splitting test due to their shape similarity. The sensitivity of the values of these parameters to the boundary conditions is also shown. Suitable choice of the shape of the specimens is discussed.

An Engineering Method for Assessing the Effects of Neutron Irradiation on the Fracture Toughness of RPV Steels

2011 ◽  
Author(s):  
Zhong-An Chen ◽  
L. Y. Wang ◽  
Yuh-Jin Chao ◽  
Poh-Sang Lam ◽  
X. S. Jin
Keyword(s):  
Fracture Toughness ◽  
Neutron Irradiation ◽  
Fracture Criterion ◽  
Crack Tip ◽  
Stress Fields ◽  
Fracture Toughness Test ◽  
Property Changes ◽  
Two Parameter ◽  
Reactor Pressure ◽  
Crack Tip Stress

Neutron irradiation degrades the reactor pressure vessel (RPV) steels. As the steel degrades, the mechanical properties of the material also change which affect the crack tip stress fields. In this article, we show that reduction of the “fracture toughness” of the RPV steels due to neutron irradiation can be interpreted by a change of an “equivalent constraint” due to material property changes. Using the J-A2 two-parameter fracture methodology to quantify the crack tip stress fields and a critical stress fracture criterion, the methodology is applied to the interpretation of fracture toughness test data from un-irradiated and irradiated RPV steels.

T -STRESS VALUES DURING FRACTURE IN WEDGE SPLITTING TEST GEOMETRIES: A NUMERICAL STUDY

2009 ◽  
pp. 419-428
Author(s):  
Stanislav SEITL ◽  
Pavel HUTAŘ ◽  
Václav VESELÝ ◽  
Zbyněk KERŠNER
Keyword(s):  
Numerical Study ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
T Stress ◽  
Wedge Splitting

Wedge Splitting Test of Foam Concrete Specimens: Calibration Curves

2014 ◽  
Vol 627 ◽  
pp. 281-284 ◽  
Author(s):  
Stanislav Seitl ◽  
Ildikó Merta ◽  
Václav Veselý
Keyword(s):  
Foam Concrete ◽  
Homogeneous Case ◽  
Load Transmission ◽  
Calibration Curves ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
T Stress ◽  
Rectangular Groove ◽  
Concrete Interface ◽  
Wedge Splitting

In the present paper, the well-known wedge splitting test is applied on specimens made from foam concrete. In the case of this material the whole test specimens cannot be made from foam concrete but the rectangular groove, needed for the load transmission pieces, has to be made of stiffer material (typically marble). K-calibration (B1) and T-stress (B2) calibration curves for such specimens are introduced. The objective was to compare and discuss the calibration curves for the homogeneous case, the case with marble parts and the case with marble parts considering the glued marble/foam concrete interface

Constraint effects on crack tip stress fields for cracks located at the fusion line of weldments

1999 ◽  
Vol 15 (3) ◽  
pp. 275-284 ◽  
Author(s):  
C Thaulow ◽  
Z.L Zhang ◽  
M Hauge ◽  
W Burget ◽  
D Memhard
Keyword(s):  
Crack Tip ◽  
Fusion Line ◽  
Stress Fields ◽  
Constraint Effects ◽  
Crack Tip Stress
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