The stress distribution of the fragile protection cover made from epoxy-foam plastics was analyzed under the given blast load by the method of the finite element simulation. And the strain distribution was tested under the safe load. So the two drafts of the structure were designed based on the results of the research on the destroy forms of the wing slip area of cover structure which was carried out according to the properties of the base material. The explosion experiments besides the static pressure and gas dynamic pressure were executed to the specimens. The results showed that the weakening groove laid along the structure in vertical, horizontal and edge lines contributed to root fracture and uniform segments at the critical pressure, and that the structure design was reasonable and the analysis method was accurate, which were proved to be the basis for the application of fragile protection cover.%设计了一种以环氧泡沫塑料为基本材料的新型易碎保护盖结构,并采用有限元模拟方法分析易碎保护盖在给定冲盖爆破压力下的应力分布.采用应变方法测试分析了易碎保护盖在安全载荷下的应变分布特点以及盖体结构边缘弹翼滑过区域的破坏方式,确定了两种盖体结构,制备出实物样件并进行了静压冲盖和燃气动压冲盖实验.结果表明:内表面沿经纬向和边缘特定分布的弱化槽结构,利于整体环氧泡沫塑料盖体在临界压力下的均匀破碎和齐根断；盖体弱化槽结构设计合理,设计分析方法准确,所建立的方法和研究结果为易碎保护盖的设计应用提供了依据.
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