scholarly journals Wedge splitting test method: quantification of influence of glued marble plates by two-parameter fracture mechanics

2014 ◽  
Vol 8 (30) ◽  
pp. 174-181 ◽  
Author(s):  
S. Seitl ◽  
B. Nieto García ◽  
I. Merta
Keyword(s):  
Fracture Mechanics ◽  
Test Method ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Two Parameter ◽  
Wedge Splitting

Wedge-Splitting Test – Determination of Minimal Starting Notch Length for Various Cement Based Composites Part I: Cohesive Crack Modelling

2010 ◽  
Vol 452-453 ◽  
pp. 77-80 ◽  
Author(s):  
Václav Veselý ◽  
Ladislav Řoutil ◽  
Stanislav Seitl
Keyword(s):  
Fracture Mechanics ◽  
Cohesive Crack ◽  
Crack Model ◽  
Singular Stress ◽  
Initiation Point ◽  
Linear Elastic ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Notch Length ◽  
Wedge Splitting

The geometric proportions of cube-shaped specimens subjected to wedge-splitting tests are numerically studied in the paper. The minimal notch length for specimens made of cement based composites varying in characteristic length of the material (a measure of material brittle-ness/heterogeneity) is verified using finite element method code with an implemented cohesive crack model (ATENA). The problem of assigning the crack initiation point (the notch tip vs. the groove corner in the load-imposing area of the specimen) is solved numerically also using both the theory of linear elastic fracture mechanics and the theory of the fracture mechanics of generalized singular stress concentrators in the second part of the two-part paper. Results ob-tained by the different approaches are compared. The minimal notch length is recommended.

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.

Wedge-Splitting Test – Determination of Minimal Starting Notch Length for Various Cement Based Composites Part II: Crack and Notch Fracture Mechanics Approaches

2010 ◽  
Vol 452-453 ◽  
pp. 81-84 ◽  
Author(s):  
Stanislav Seitl ◽  
Jan Klusák ◽  
Václav Veselý ◽  
Ladislav Řoutil
Keyword(s):  
Fracture Mechanics ◽  
Initial Crack ◽  
Cohesive Crack ◽  
Crack Model ◽  
Singular Stress ◽  
Initiation Point ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Notch Length ◽  
Wedge Splitting

The paper focuses on the geometrical proportions of cube-shaped quasi-brittle specimens subjected to a wedge-splitting test (WST). The minimal/optimal initial crack/notch length for successful performance of WST on these specimens is studied numerically (ANSYS). This second part of the paper treats the problem asymptotically, i.e. from the point of view of a very fine grained silicate composite material with negligible characteristic length which describes the level of the material brittleness (i.e. brittle). The problem of competition of the crack initiation point between the notch tip and the groove corner in the load-imposing area of the specimen is solved using theories of both linear elastic fracture mechanics and fracture mechanics of generalized singular stress concentrators. The numerically obtained crack/notch length is compared to results of numerical simulations using cohesive crack model reported in the first part of the paper. The minimal notch length is recommended.

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