Glass damage by impact spallation

✍ Scribed by A. Nyoungue; Z. Azari; M. Abbadi; S. Dominiak; S. Hanim

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 608 KB
• Volume: 407
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2005.07.031

✦ Synopsis

This paper presents an investigation of spallation in impact-loaded glass. For this purpose, spall tests on cylindrical specimens were performed for various impact velocities using a Hopkinson bar "HB". After each test, the specimen was rebuilt from restored fragments and the analysis of the fracture surface was performed by means of a scanning electron microscope. Fracture is found to propagate in a transversal way. In addition, numerical modeling allowed an appropriate prediction of the experimental stress level, time to fracture and fracture location. Based on microscopic observations of the fractured surface, a new fracture criterion has been proposed. It defines the damage variable as a function of the ratio between the initial surface and its evolution.