MissSt_FailureMat_lecture

MissSt_FailureMat_lecture - Dynamic failure of materials:...

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Dynamic failure of materials: some Army examples John D. Clayton, Ph.D. U.S. Army Research Laboratory Aberdeen Proving Ground, MD 29 September 2010
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Army Research Laboratory "The Army Research Laboratory (ARL) is the Army's corporate basic and applied research laboratory. Our mission is to provide innovative science, technology, and analysis to enable full-spectrum operations. ARL consists of the Army Research Office (ARO) and six Directorates-- Weapons and Materials , Sensors and Electron Devices, Human Research and Engineering, Computational and Information Sciences, Vehicle Technology, and Survivability and Lethality Analysis. The Army relies on this ARL Team for scientific discoveries, technologic advances, and analyses…." www.arl.army.mil
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ARL at Aberdeen Proving Ground Formerly known as Ballistics Research Lab Merged with Harry Diamond Lab (Adelphi, MD) and Army Materials Technology Lab (Watertown, MA) to form ARL in mid 1990s Developed first computer ENIAC (1946) More recently, armor upgrade kits for HUMVEE, MRAP vehicles
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Materials for Army applications • "Protection" -Armor for ground vehicles, body armor for soldiers -Metals, ceramics, composites (Kevlar, etc.), polymers -Failure is part of the function: goal is to survive one or a few hits • "Lethality" – Weapons : bullets, projectiles, shaped charges, fragmentation devices, explosives… – Metals, energetic materials – Failure is the function: typically one shot
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Examples of materials failure in military applications 1. Adiabatic shear localization 2. Spall fracture 3. Dynamic fragmentation
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Adiabatic shear localization • Regions of intense shear deformation in ductile metals • Occurs during high strain-rate loading • May precede fracture or melting Voids Tantalum
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Adiabatic shear localization • "Plugging" failure of metallic armor Titanium alloy Ti-6Al-4V [Schoenfeld & Kad 2002] Numerical simulation plug shear band location Microstructure simulation Ballistic Experiment projectile target
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Adiabatic shear localization • "Plugging" failure of metallic armor Aluminum alloy
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MissSt_FailureMat_lecture - Dynamic failure of materials:...

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