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This study investigates the physics of backspatter from a high\u2010speed projectile impact and evaluates a range of simulant materials using impact tests. Next, we evaluate a mesh\u2010free method called smoothed particle hydrodynamics (<jats:styled-content style=\"fixed-case\">SPH<\/jats:styled-content>) to model the splashing mechanism during backspatter. The study has shown that a projectile impact causes fragmentation at the impact site, while transferring momentum to fragmented particles. The particles travel along the path of least resistance, leading to partial material movement in the reverse direction of the projectile motion causing backspatter. Medium\u2010density fiberboard is a better simulant for a human skull than polycarbonate, and lorica leather is a better simulant for a human skin than natural rubber.<jats:styled-content style=\"fixed-case\">SPH<\/jats:styled-content>is an effective numerical method for modeling the high\u2010speed impact fracture and fragmentations.<\/jats:p>","DOI":"10.1111\/1556-4029.12701","type":"journal-article","created":{"date-parts":[[2015,3,5]],"date-time":"2015-03-05T00:01:35Z","timestamp":1425513695000},"page":"627-637","source":"Crossref","is-referenced-by-count":16,"title":["Evaluating Simulant Materials for Understanding Cranial Backspatter from a Ballistic Projectile"],"prefix":"10.1111","volume":"60","author":[{"given":"Raj","family":"Das","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering Centre for Advanced Composite Materials University of Auckland Auckland 1010 New 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