|
|
Fracture Analysis of Cube- and Cylinder-shaped WST Specimens Made of Cementitious Composites with Various Characteristic Length
Řoutil, L. ; Veselý, V. ; Seitl, Stanislav
The paper is focused on finding reasonable proportions for both cube-shaped and cylinder-shaped silicate-based composite specimens subjected to wedge-splitting tests. The analysis is conducted using finite element method code with an implemented cohesive crack model. The aspect of the material's brittleness, related to the heterogeneity of the material and described by what is termed as the characteristic length of quasi-brittle material, is accented. The results yield some recommendations for the determination of parameters of nonlinear fracture models for cementitious composites by means of wedge splitting tests of laboratory specimens of the two standard shapes.
|
|
| |
|
|
Optimization of the initial crack length in consideration of the groove width for wedge splitting test specimen
Seitl, Stanislav ; Klusák, Jan
An optimization of the initiate crack length in view of the width of grips groove of the wedge splitting (WS) specimen is the topic of the contribution. The WS specimens are now started to be used for fracture laboratory testing, especially of quasi-brittle cement-based composites. For the optimization the theory of the general fracture mechanics is used. For the numerical calculation the finite element method and ANSYS software are used. At the end, the optimal crack lengths for various grips widths are discussed and some suggestions are pronounced.
|
|
| |
|
|
Influence of vertical compresive force on level of constraint in cubical specimen for wedge splitting test
Seitl, Stanislav ; Klusák, Jan ; Dymáček, Petr ; Řoutil, L. ; Veselý, V.
The subject of the contribution is to gain new aspects of knowledge about the fracture behaviour of cementitious building materials by the wedge splitting test (WST). The particularly, the paper investigates the influence of the vertical compressive force Pv, that represents a reaction of the bottom support of the specimen, on the fracture parameters via tools of the two-parameter fracture mechanics. The effects of the vertical compressive force, Pv, on the plastic and fracture process zones are examined.
|
guest ::
