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Physics of Crash in Automobile Structures.
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Structural Deformation in Crash Crush Space Measurement Static Crush Space = Free Crush + Crushed Components Dynamic Crush = Static Crush Space + Dynamic Dash Intrusion Load Distribution Philosophy Transition zone bridges offset between load paths in crush zone & safety cage; enables effective load transfer & provide stability controls.
RBE2 vs RBE3
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Before I start to explain you about RBE2 and RBE3, one should know what rigid elements are, and why do you use them? A rigid element is a link from one node to one or more other nodes, where the motion of the node(s) is governed by the "degrees of freedom" you choose to connect. A few examples of rigid elements used in some applications given below: To model the dynamic behavior of the vehicle, sometimes the engine can be modelled as a mass elements connected by an RBE2 rigid element to the engine's multiple mounting locations. The mass is located at the centre of gravity of the engine, and the rigid element links the engine mass to the rubber mounts (eg. springs or bushes). Bolts at pre-load needs to be modelled, but does not need to modelled with any other than as a "bar" or "beam" element. An RBE2 can be used to connect the end node of the "bolt" element to the multiple nodes which represent the washer area over which the bolt load acts. ...