hat t he ave a mplit ude and t he act uati On ti me are bOt h aff ected by f Oa med materi als i n t he l ayeredРmedi a ~and t he ener gy absOr pti On Of multi-l ayered medi a it h t he f Oa med materi als i s Obvi Ous .As a re-Рsult ~t he ener gy and mO ment u m Of diff erent l ayer are changed hen stress ave pr Opagates i n t he l ay-Рered medi a .CO mpari ng t he medi a i ncl udi ng f Oa med al u mi ni u m it h t he medi a i ncl udi ng f Oa med cOn-Рcrete ~it has been shO n t hat f Oa med cOncrete can l ead t O t he l O er ave a mplit ude ~but f Oa med al u-Рmi ni u m can absOr b t he mOre ener gy t han t hat Of f Oa med cOncrete under t he cOnditi On Of l O vel Ocit yРi mpacts .РKey words :pr Opagati On Of stress ave 3nu meri cal si mul ati On 3multi-l ayered medi a 3f Oa med materi al
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