Modified compact tension specimen for experiments on cement based materials: comparison of calibration curves from 2D and 3D numerical solutions

Abstract

ABSTRACT. The evaluation of fracture mechanics parameters of materials has become very important part of considering the condition of older constructions as well as properties of newly developed materials. This contribution focuses on a numerical simulation and a calculation of fracture mechanical properties of modified compact tension test configuration. It is possible to prepare the specimens used for this test very easily from a drilled core or from specimens used for cylindrical compression test. The focus of contribution is to compare selected outputs from numerical solution of 2D (plane strain conditions) with 3D models. Particularly, the determination of the influence of 2D and 3D model on the calibration curves for selected fracture mechanics parameters is of interest. Finite element software ANSYS was used for the numerical analysis. KEYWORDS. Stress Intensity

Compact tension fracture specimen: Experimental and computational implementations on stress intensity factor

“…In the literature, several studies could be found focusing on the intended compact tension (CT) fracture specimen; for example, an experimental study on fatigue crack growth behaviour of 6082T6 aluminium alloy, 13 SIF calculation using thermoelastic stress analysis (TSA), experimental and numerical implementations, 14,15 crack closure effects on fatigue crack propagation rates on P355NL1 steel using an inverse analysis, 16 mixed-mode SIFs determination using DIC and an interaction integral on maraging steel EZ 2 NKD 18. 17 Furthermore, Seitl 18,19 carried out several experimental/numerical studies associated with the CT test to determine the fracture and fatigue characterizations of the concrete-based materials.…”

Evaluation of mixed mode I/II fracture toughness of C 50/60 from Brazilian disc test

“…Fracture mechanical parameters of cementitious materials are usually obtained from recommended tests such as: three-point (3PBT) and four-point (4PBT) bending test with notch in tested specimen [4], for mixed mode load [5], wedge splitting test (WST) [6][7][8][9], or a combination of WST/3PBT [10] and modified compact tension test (MCT) [11,12]. All tests have a predefined prismatic geometry and using them on specimens made from the core-drill is expensive and not very efficient, therefore it is very appropriate to use a Brazilian disc test specimen with central notch (circle cut from the core-drill cylinder) [13][14][15][16] to determinate fracture parameters of building materials see Fig.…”

Comparison of fracture toughness values of normal and high strength concrete determined by three point bend and modified disk-shaped compact tension specimens

“…or this work are used the results presented by Seitl and Viszlay [26] for MCT tests through 2D and 3D finite element model of steel bars and cement based materials. In their contribution, four mechanical fracture parameters (stress intensity factor, T-stress, crack opening displacement -COD and crack mouth opening displacement -CMOD) are evaluated by means of two finite element models, one of them 2D and the another 3D.…”

“…As MCT test is a very recent methodology of calculus, detailed studies must be carried out to deepen on the reliability of the results. In this way, Seitl and Viszlay [26] provided calibration curves corresponding to four fracture mechanical parameters (stress intensity factor, K I , T-stress, crack opening displacement, COD, and crack mouth opening displacement, CMOD) for cement based materials varying the elasticity modulus (E). So significant amount of evaluations is measured by means of finite element model of the MCT test developed for them.…”