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225_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

225_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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SECTION 2.8 Impact Loading 219 Problem 2.8-10 A bumping post at the end of a track in a railway yard has a spring constant k 8.0 MN/m (see figure). The maximum possible displacement d of the end of the striking plate is 450 mm. What is the maximum velocity max that a railway car of weight W 545 kN can have without damaging the bumping post when it strikes it? Solution 2.8-10 Bumping post for a railway car k 8.0 MN/m W 545 kN d maximum displacement of spring d max 450 mm Find max K INETIC ENERGY BEFORE IMPACT KE Mv 2 2 Wv 2 2 g S TRAIN ENERGY WHEN SPRING IS COMPRESSED TO THE MAXIMUM ALLOWABLE AMOUNT
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