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原文传递 Acquisition of State-of-the-Art High-Speed Video Camera for Capturing Dynamic Deformation under Impact Loads.

题名：	Acquisition of State-of-the-Art High-Speed Video Camera for Capturing Dynamic Deformation under Impact Loads.
作者：	Chalivendra, V.; Kim, Y. K.
关键词：	High speed cameras, Video cameras, Impact loads, Deformation (mechanics), Accelerometers, Helmets, Damage, Compression, Strain rate, Crack propagation, Composite materials, Laminates, Fiber reinforced composites, Thickness, Angular acceleration, Cracks, Dynamic loads, Dynamic deformation, Military helmets, Split hopkinson pressure bar technique, Dynamic fracture, Padding, Feam (flocked energy absorbing materials), Shimadzu hyper vision hpv-x2 camera
摘要：	Major Goals: 1. Use high-speed video camera along with linear impactor instrumented with high-end accelerometers to investigate the deflection of military helmets mounted on a magnesium head under impact loads. Use the deformation information to verify the numerical models to be developed in coming years. 2. Utilize split Hopkinson pressure bar technique along with high-speed video camera to investigate the damage in both compression and indirect tension at both medium and high strain rates. 3. Employ modified Hopkinson pressure bar system along with high-speed video camera to investigate the crack initiation and propagation in laminated composites reinforced with short flocked fibers along through thickness direction. Accomplishments: 1. Dynamic fracture of laminated composites reinforced with short fibers along the thickness direction: Experiments were conducted to investigate the crack dynamics of laminated composites. Currently working on capturing electro-mechanical response along with high speed imaging to correlate crack propagation due to damage to in-situ change in electrical resistance.2.Dynamic deformation studies of novel energy absorbing materials for military helmets: Fiber based novel layeredmaterials to be used in military helmet pads are investigated for deformation and constitutive response underimpact loading conditions using split Hokinson pressure bar along with acquired high-speed video camera.3. Impact loading of military helmets with novel padding materials for mitigating traumatic brain injuries: Novelpadding materials for army helmet is currently investigated for their performance against rotational loadingconditions. Experiments were performed to understand the deflection and angular acceleration of helmets forvarious positions of the helmets.
报告类型：	科技报告