Microcracks, spall and fracture in glass: A study using short pulsed laser shock waves
| Autor: | Motohiro Nakano, Y. Yamauchi, K. Kishida, Kazuo Tanaka, Xin-Zen Li |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 83:3583-3594 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | This work reports our meso mechanical study of microcrack behavior, especially the process leading from microcracking to macro failure. Using laser loading with a duration on the order of nanoseconds, spallation in a cylindrical geometry was achieved in soda-lime glass at the microcrack evolution stage. Laser induced shock waves were used to conduct crack initiation experiments for the first time. The specimens were examined after experiments and were compared with those loaded by conventional static and dynamic methods. A meso scale failure model of nucleation, growth, and percolation (NGP) is suggested based on the experiments. The NGP model is characterized by a randomly generated microcrack field and by simultaneous percolation statistics in time iteration. In most existing damage models, the statistical average of microcracks over a finite space is required in order to evaluate the damage variables. This procedure is not necessary in the NGP model. We show that the connection of microcracks can be very complicated, possibly a self-organized process. |
| Databáze: | OpenAIRE |
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