The Mechanical Fracture Characterization of Non-Linear Flexible Ceramics Using Digital Image Correlation
During their application, refractory materials are submitted to several thermal shock attacks. That is why; improving their thermal shock resistance has a great importance and can enhance their lifetime. This characteristic is directly related to strains to rupture. The non-linear mechanical behavior which characterizes specific developed ceramics, and is a consequence of their micro-cracked microstructure, leads to the increase of their strain to rupture level. This limit allows a better resistance to thermal shock solicitations. Magnesia spinel materials are good candidates to characterize such non-linear mechanical behavior dependent on their microstructure. This non linearity is due to the presence of micro-cracks network. Indeed, mechanical behavior can vary from a fragile one to a large non-linear one according to the degree of micro-cracking present within the material. In this paper, to investigate the crack propagation and the non-linear mechanical behavior of this material, wedge splitting test was used and coupled to digital image correlation technique. Results underline the influence of the addition of spinel on the non-linear mechanical behavior by comparing the non-linear mechanical behavior of magnesia spinel with pure magnesia. Besides, results clarified also the crack propagation mechanisms which are specific to these heterogeneous materials.
Magnesia spinel Flexibility Digital image correlation Crack branching
Younes Belrhiti Ion Octavian Pop Pascal Doumalin Jean Christophe Dupre Thomas Auer Dietmar Gruber Harald Harmuth Marc Huger Thierry Chotard
GEMH,CEC,Université de Limoges 12 rue Atlantis,87068 Limoges Cedex,France;SPCTS UMR CNRS 7315,CEC,12 GEMH,CEC,Université de Limoges 12 rue Atlantis,87068 Limoges Cedex,France Institut Pprime,CNRS,Université de Poitiers,11 Boulevard Marie et Pierre Curie,86962 FuturoscopeChas Chair of Ceramics,University of Leoben,8700 Leoben,Austria
国际会议
北京
英文
1-9
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）