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摘要: 应用泡沫金属子弹撞击加载的方式研究了固支泡沫铝夹芯梁和等质量实体梁的塑性动力响应。 采用激光测速装置和位移传感器测量了泡沫子弹的撞击速度和后面板中心点的位移-时间曲线,研究了加载 冲量、面板厚度和芯层厚度对夹芯梁抗冲击性能的影响。给出了泡沫铝夹芯梁的变形与失效模式,实验结果 表明结构响应对夹芯结构配置比较敏感,后面板中心点的残余变形与加载冲量、面板厚度呈线性关系。与等 质量实体梁的比较表明,泡沫铝夹芯梁具有更好的抗冲击能力。实验结果对多孔金属夹芯结构的优化设计具 有一定的参考价值。Abstract: Aninvestigationondynamicresponseofclampedsandwichbeamswithaluminumfoam coresandmonolithicbeamswasachievedbyusingaluminumfoamprojectileloading.LDVdeviceand Laserdisplacementtransducerwereappliedto measureimpactvelocityofprojectileanddeflectiontimehistoryofthemid- pointofbackfaceofthebeam,respectively.Andthentheeffectsofapplied impulse,face-sheetthickness,andcorethicknessontheresponseofstructureswerestudied.Deformationandfailuremodesofsandwichbeamsareexhibitedaccordingtoexperimentalinvestigation. The resultsindicatethatthestructuralresponseissensitivetotheconfigurationofsandwichstructures. Thepermanentdeflectionofthemid-pointofbackfaceispresentedproportionalrelationshipwithappliedimpulseandface- sheetthickness,respectively.Comparingwithmonolithicbeamsofthesame mass,theresultshowsthatsandwichbeamshaveasuperiorshockresistance.Theexperimentalresultsareofworthtooptimumdesignofcellularmetallicsandwichstructures
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Key words:
- solidmechanics /
- dynamicresponse /
- impactloading /
- sandwichbeam /
- aluminumfoam
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