Crashworthiness: Energy Management and Occupant Protection by Jorge A.C. Ambrosio

By Jorge A.C. Ambrosio

From the basics of influence mechanics and biomechanics to trendy research and layout ideas in effect strength administration and occupant security this e-book presents an summary of the appliance of nonlinear finite parts, conceptual modeling and multibody strategies, influence biomechanics, damage mechanisms, occupant mathematical modeling, and human surrogates in crashworthiness.

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1) where Wq is a quasi-static estimate of the maximum pennanent transverse displacement, and Pc, is a plastic collapse force for the same structure when loaded statically at the same location as the striking mass. 1), is also equal to the intemal energy dissipated at the plastic hinges and zones which develop in a structural member during plastic defonnation. 2) where Di is the total energy absorbed at each plastic hinge and zone during the plastic deformation required to absorb Ke, and n is the total number of such sites in a structural member.

Usually, these wrinkles, or buckles, develop sequentially from one end of a tube so that the phenomenon is known as progressive buckling. 4 for a thin-walled tube with a square cross-section. 3( a). 4]. 3]. 1] as quasi-static, and the influence of inertia forces is, therefore, ignored as discussed in Chapter 2. This is a reasonable simplification when the striking mass (G) is much larger than the mass of a tube (m ). The axial inertia force of a striking mass is Gü, where ü is the axial deceleration during the impact event.

Techniques for measuring stress-strain re1ations at high strain rates, Experimental Mechanics, 6, 395-402, 1966. 14] Manjoine, M. , Influence of rate of strain and temperature on yield stresses ofmild steel, J. of Applied Mechanics, 11, 211-18, 1944. 15] Campbell, J. D. and Cooper, R. , Yield and flow oflow-carbon steel at medium strain rates, In Proceedings of the Conference on the Physical Basis of Yield and Fracture, Institute of Physics and Physical Society, London, 77-87, 1966. , Some comments on the modelling ofmaterial properties for dynamic structural plasticity, In Proceedings 4th International Conference on the Mechanical Properlies of Materials at High Rates ofStrain, Oxford, Institute ofPhysics Conference Series No.

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