Dynamic fragmentation induced by network-like shear bands is observed in a Zr-based bulk metallic glass subjected to impact loading, which is different from shear failure via one dominant shear band under quasi-static compression. Further, the influence of elastic strain energy on the evolution of shear bands is investigated. It is shown that the shear-band pattern occurring in one dominated mode or in multiple modes strongly depends on the loading rates. Dynamic fragmentation is due to the competition between the elastic strain energy driving a shear band and the dissipated energy along the shear band. 

The work is supported by the National Natural Science Foundation of China (Grant Nos. 11472287, 11132011 and 11202221), the National Basic Research Program of China (Grant No. 2012CB937500), and the CAS/SAFEA International Partnership Program for Creative Research Teams.

Zeng F,Chen Y,Jiang MQ,et al. Dynamic fragmentation induced by network-like shear bands in a Zr-based bulk metallic glass[J]. INTERMETALLICS,2015-01,56:96-100.