Abstract
The double-torsion (DT) test is commonly used to characterize the slow crack growth behavior of brittle materials. However, it relies on several mechanical hypotheses which still need to be deeply tackled. Measuring the full 3D displacement field experimentally through in situ experiments would improve the understanding of the mechanical behaviour. A dedicated experimental set-up was designed to perform in situ tests in a X-ray Computed Tomography (XCT) scanner on a porous brittle ceramic which is optically opaque. The analysis of the three-dimensional images with Digital Volume Correlation (DVC) allows a first study of the global kinematics and the stable crack growth propagation. This experimental and numerical methodology presents a strong potential for a future deep understanding of this complex mechanical test.
Highlights
A Complex Mechanical Test DTMany mechanical tests exist to characterize the fracture behavior of materials
The stress intensity factor KI is often considered in a first approximation as independent of crack length within the linear elastic fracture mechanics framework (equations (1) and (2)—Notations are given in Fig. 1): 3(1 + ν) 1/2
To determine the exact crack tip location and to quantify the displacement field, the Digital Volume Correlation (DVC) method is applied to these scans, with C8 finite element shape functions
Summary
A Complex Mechanical Test DTMany mechanical tests exist to characterize the fracture behavior of materials. The doubletorsion (DT) test, that can be seen as an extension of a bending test, is more specific to the ceramic materials It enables a stable crack propagation and the measurement of slow crack growth curves even for the most brittle materials like ceramics [1, 2]. This test consists in bending one of the edges of a rectangular notched plate put on four rollers at each corner (Fig. 1). In such a setup, one face is loaded in tension whereas the other one is loaded in compression. The stress intensity factor KI is often considered in a first approximation as independent of crack length within the linear elastic fracture mechanics framework (equations (1) and (2)—Notations are given in Fig. 1): 3(1 + ν) 1/2
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