[1] Univ Otago, Dunedin Sch Med, Dunedin 9059, New Zealand
[2] Def Acad United Kingdom, Impact & Armour Grp, Dept Engn & Appl Sci, Cranfield Def & Secur, Shrivenham, Wilts, England
[3] Univ Otago, Otago Ctr Microscopy, Dunedin 9059, New Zealand
[4] Univ Angers, Angers, France
[5] Univ Otago, Sir John Walsh Res Inst, Dunedin 9059, New Zealand