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SVTPerformance's Chain of Restaurants
Road Side Pub
engineers, i need your help with mechanics of materials
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<blockquote data-quote="olgreydog7" data-source="post: 6736779" data-attributes="member: 65150"><p>The first one will need some buckling equations I think. I can't remember the qualities or equations of the top of my head, but it may be of sufficient diameter that it doesn't matter anyway. It may be a straight compression problem. From looking at the answers, it doens't look like the moment matters, since they don't give the weight of the material, or really enough info to use the density to determine weight. So, you should just need the E from the steel and brass in order to ind how much of the energy is absorbing in each one. This will also send you down the road to finding the deflection of C. Remember equal and opposite reactions, then solve based on deflection. </p><p></p><p>On the second one, what you need to do is find out how much the materials are growing based on temp. Assume that the stress is zero at the begining. Again, equal and opposite reactions, so the concrete is pushing on the steel and the steel is pushing on the concrete. The difference in stress is due to difference in area. As long as your sign convention is correct, you may get a + rather than a -, but if they are opposite for steel and concrete you are ok. Now, the steel will dflect more for temp than the concrete, so take that length, and the area of teh steel and figure out the force that the steel is pushing and you'll get the stress. Do the same thing for the concrete, but you'll find it's pushing against the steel. I think the steel will come out of teh concrete too, so that shoudl relax some of the pressure on the steel. </p><p></p><p> Fun problem man, good luck.</p></blockquote><p></p>
[QUOTE="olgreydog7, post: 6736779, member: 65150"] The first one will need some buckling equations I think. I can't remember the qualities or equations of the top of my head, but it may be of sufficient diameter that it doesn't matter anyway. It may be a straight compression problem. From looking at the answers, it doens't look like the moment matters, since they don't give the weight of the material, or really enough info to use the density to determine weight. So, you should just need the E from the steel and brass in order to ind how much of the energy is absorbing in each one. This will also send you down the road to finding the deflection of C. Remember equal and opposite reactions, then solve based on deflection. On the second one, what you need to do is find out how much the materials are growing based on temp. Assume that the stress is zero at the begining. Again, equal and opposite reactions, so the concrete is pushing on the steel and the steel is pushing on the concrete. The difference in stress is due to difference in area. As long as your sign convention is correct, you may get a + rather than a -, but if they are opposite for steel and concrete you are ok. Now, the steel will dflect more for temp than the concrete, so take that length, and the area of teh steel and figure out the force that the steel is pushing and you'll get the stress. Do the same thing for the concrete, but you'll find it's pushing against the steel. I think the steel will come out of teh concrete too, so that shoudl relax some of the pressure on the steel. Fun problem man, good luck. [/QUOTE]
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SVTPerformance's Chain of Restaurants
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engineers, i need your help with mechanics of materials
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