Elite Engineer Posted December 4, 2017 Share Posted December 4, 2017 I'm trying to illustrate the importance of wearing a seat belt properly, specifically when people wear seat belts over their mid stomach, instead of their pelvic girdle. In figuring out the force applied to a passengers abdomen when the car hits an object and the person's inertia drives them into the seat belt, is it necessary to the factor in the area of the seat belt? I'd think it would be important because of P = F/A. Hence the seat belt is maybe 2 inches in width, so it's going to produce way more damage that if it were 20 inches in width. Also, how would you calculate the force of the person moving forward? Just a standard momentum calculation? ~ee Link to comment Share on other sites More sharing options...
fiveworlds Posted December 4, 2017 Share Posted December 4, 2017 (edited) You could use a crash test dummy with sensors all over it and send the data back to yourself to have a look at. The modern crash test dummy(https://en.wikipedia.org/wiki/Hybrid_III) is calibrated to specific regulations but you could make a simple one yourself. Edited December 4, 2017 by fiveworlds Link to comment Share on other sites More sharing options...
Elite Engineer Posted December 4, 2017 Author Share Posted December 4, 2017 What about a simple physics diagram, with vectors, mass, velocity? Won't be the EXACT data, but can get close I imagine. Link to comment Share on other sites More sharing options...
fiveworlds Posted December 4, 2017 Share Posted December 4, 2017 Quote What about a simple physics diagram, with vectors, mass, velocity? There is way too many variables. You'd need to know everything about the vehicle. Link to comment Share on other sites More sharing options...
swansont Posted December 4, 2017 Share Posted December 4, 2017 The average force is the momentum change divided by the impact time. Final momentum is zero, so F = p/t Link to comment Share on other sites More sharing options...
Elite Engineer Posted December 4, 2017 Author Share Posted December 4, 2017 3 hours ago, fiveworlds said: There is way too many variables. You'd need to know everything about the vehicle. Give me a handful of variables. I'm not trying to test the effectiveness of a seat belt. Just trying to get a "close" average of the forces applied to the passenger Link to comment Share on other sites More sharing options...
swansont Posted December 4, 2017 Share Posted December 4, 2017 m, v, and t are the variables Link to comment Share on other sites More sharing options...
fiveworlds Posted December 4, 2017 Share Posted December 4, 2017 Quote Just trying to get a "close" average of the forces applied to the passenger Could you not just use the software that does that? http://www.altairhyperworks.com/solution/Crash-Safety-Impact Link to comment Share on other sites More sharing options...
Elite Engineer Posted December 4, 2017 Author Share Posted December 4, 2017 Now that I know it exists, yes. Thanks Link to comment Share on other sites More sharing options...
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