Crack propagation in functionally graded strip under thermal shock
1 University of Ruse, Department of Engineering Mechanics, Studentska 8, Ruse 7017, Bulgaria
2 Lublin University of Technology, Faculty of Civil Engineering and Architecture, Department of Solid Mechanics, 20-618 Lublin, Nadbystrzycka 36, Poland
Received: 4 June 2013
Revised: 2 August 2013
Published online: 30 September 2013
The thermal shock problem in a strip made of functionally graded composite with an interpenetrating network micro-structure of Al2O3 and Al is analysed numerically. The material considered here could be used in brake disks or cylinder liners. In both applications it is subjected to thermal shock. The description of the position-dependent properties of the considered functionally graded material are based on experimental data. Continuous functions were constructed for the Young's modulus, thermal expansion coefficient, thermal conductivity and thermal diffusivity and implemented as user-defined material properties in user-defined subroutines of the commercial finite element software ABAQUS™. The thermal stress and the residual stress of the manufacturing process distributions inside the strip are considered. The solution of the transient heat conduction problem for thermal shock is used for crack propagation simulation using the XFEM method. The crack length developed during the thermal shock is the criterion for crack resistance of the different graduation profiles as a step towards optimization of the composition gradient with respect to thermal shock sensitivity.
© EDP Sciences, Springer-Verlag, 2013