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Car Crash Physics: Deceleration Calculations
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[QUOTE="jack action, post: 6849399, member: 240508"] Here's a stress-strain curve: [CENTER][ATTACH=full]321501[/ATTACH][/CENTER] The first part is the true elastic part. After that, you get permanent plastic deformation until fracture. But that is based on the original cross-section area, referred to as the [I]engineering[/I] stress-strain curve. But in the [I]necking[/I] part, the cross-section area is reducing. If you consider this area reduction, you get the [I]true[/I] stress-strain curve. The following figure shows the differences: [CENTER][ATTACH=full]321502[/ATTACH][/CENTER] As you can see, it looks a lot more like a straight line, right up to the fracture, even in the plastic deformation section. It doesn't really matter that the spring "won't come back" because the energy has been spent instead of stored. What matters is that we can evaluate how much energy it took. [/QUOTE]
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Car Crash Physics: Deceleration Calculations
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