New technology to protect structures and armored vehicles against terrorist attacks الإساليب الحديثة في تدريع وحماية المنشآت والمرکبات ضد الهجمات الإرهابية

Abstract
The use of explosives to attack structures and vehicles has been increased
during the last few years. The terror attacks lead to death of innocent
people and to destroy the building (civilian and military). The armored
vehicles and the structures should be protected from explosives attacks
using light weight sandwich structure and composites materials.
The protection system against blast effect is highlighted using composite
structures and composite materials to protect vehicles and structures.
Blast field test is conducted. The response of the light composite
structure and composite materials is studied using finite element analysis
(FEA). The blast field test is used to verify the numerical model. The
composite structure strengthened by aluminum foam (ALF) is used to
protect the bottom of the armored vehicle and the structures against the
blast wave propagation. The ALF and the cylindrical aluminum tubes are
used to fill the space at the sandwich structure as a light weight material.
This study presents a comparison between the results obtained by both
the field blast test and the FEA to validate the accuracy of the finite
element model. The effects are expressed in terms of displacement-time
history effect on the sandwich steel panels and the structures as the
explosive wave propagates. The results obtained by the field blast test
have a good agreement with those obtained by numerical model. The
composite materials improve the performance of the sandwich structure
under the impact of blast loading. The light weight sandwich structure
and the composite materials could be used as mitigation system to protect
the bottom of the armored vehicles and the structures against blast hazard.