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

S Seitl,V Viszlay

doi:10.3221/igf-esis.39.13

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.

Highlights

Compact tension (CT) tests have been widely and successfully applied for measuring the fracture properties of several materials, such as metals (ASTM Standard E-399 [3]), or even composite materials with limited orthotropy [1]
The aim of the paper is to provide calibration curves according to four different fracture mechanics parameters and to compare selected case with the values obtained from 3D model with the results from 2D model, which have already been published in [21]
Effect of elasticity modulus ratio The numerically obtain results from 2D model solution covering the effect of elastic modulus ratio are shown in Figs. 4-7

Summary

Introduction

Compact tension (CT) tests have been widely and successfully applied for measuring the fracture properties of several materials, such as metals (ASTM Standard E-399 [3]), or even composite materials with limited orthotropy [1]. The compact tension fracture toughness test (CT test [11, 22]) is essentially performed by applying equal and opposite forces through two holes previously made in the specimen, to propagate an initial crack. The modified compact tension test (MCT [4, 5, 9, 10, 21, 23) is a quite new test configuration on notched specimens to obtain fracture mechanics parameters of materials in laboratory conditions, note that test is derived from classic CT test.

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Conclusion