DYNAFRACT
Fracture characterization of ti/cmo bonded interfaces under dynamic and multiaxial loading
The aim of this work is to introduce a new experimental protocol for measuring the critical energy restitution rate Gc in various mode mixtures and with a new test adapted to static and dynamic loading up to 1ms-1.
With the same equipment, small variations in sample geometry are used to cover the wide range from pure mode I to pure mode II. The displacement field can be acquired during testing, for example, using digital image correlation with a high-speed camera. By applying this field in a finite element code, the position of the crack bottom and the stress are calculated indirectly. This method is a clearly relevant alternative to the direct measurement of these two parameters, which is difficult to obtain precisely in the dynamic case. Using linear elastic fracture mechanics (LEFM) theory, the critical rate of strain energy restitution Gc can be obtained with the complacency method or with a method based on beam theory.