摘要:
利用电炮加载聚酯薄膜飞片分别对二维平纹编织C/SiC复合材料(2D-C/SiC)和LY12硬铝材料
在3.4~9.5km/s速度下进行碰撞实验。利用光纤位移干涉仪测定了靶材的自由面速度,并对高速撞击碎片
颗粒进行了收集,采用超声波扫描系统无损检测等方法对2D-C/SiC材料在超高速冲击载荷作用下的力学响
应进行了检测。结果表明,随着冲击能量的增大,2D-C/SiC材料板自由面速度逐渐升高,损伤局部且面积逐
渐增大,碎片云团作用区域逐渐变大。与铝板相比,2D-C/SiC材料碎片云团整体能量较小、作用区域较大、能
量面密度较低,是飞行器防护结构设计中一种比较理想的防护材料。
Abstract:
Two-dimensional(2D)plain-wovenC/SiCcompositeplatesandduralumin (LY12)plates
wereimpactedbymylar-filmflyerplateswhichwereloadedbyanelectricalgunto3.4-9.5m/s,respectively.
Thefreeinterfacialvelocitiesoftheexperimentalplates were measured withalaser
Dopplervelocimeterandtheimpact-induceddebriscloudswerecollectedwithpreparedfoamplates.
Andthedamageareasoftheexperimentalplateswereinspectedbyusinganultrasonicscanningsystem.
Basedontheaboveexperimentalresults,themechanicalresponsesofthe2Dplain-wovenC/SiC
compositesunderhypervelocityimpactwereanalyzed.Theaboveexperimentalresultsshowthatwith
theincreaseoftheimpactintensity,thefreeinterfacialvelocitiesofthe2Dplain-wovenC/SiCcompositeplatesincrease,
thelocaldamageareasincrease,andthedebrisclouds-affectedregionsinthe
preparedfoamplatesincrease.AndcomparedwiththeLY12platessubjectedtotheimpactofthe
sameintensity,theintensitiesofthedebriscloudsfromthe2Dplain-wovenC/SiCcompositeplates
arelower,theiraffectingregionsinthefoamplatesarelarger,andtheareicimpactenergiesarelower.
Sothe2Dplain-wovenC/SiCcompositescanmarkedlydecreasethedamagewhichwillbesuffered
byprotectedobjectsanditcanbeusedasanidealprotective materialinspacedebrisprotection
shields.
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