Effect of air gaps on the ballistic resistance of ductile shields perforated by nonconical impactors

we proved that localized interaction model (LIM) for shield-impactor interaction implies independence of the ballistic limit velocity (BLV) of spaced shield on air gaps and their widths for conical striker.In this study, the effect of deviation from a conical shape on ballistic properties of spaced shield is investigated using two-term LIM.It is found that this effect is insignificant and it causes small changes (of the order of few percent) in the magnitude of the BLV and energy absorbed by a shield.These theoretical predictions are in agreement with the available experimental results.