CrazyEngineers Forum - Mechanical & Civil Engineering |
| Posted: 15 Nov 2011 02:32 AM PST Hi all, I found following two questions in a book; the solutions has confused me. Pleas help with the correct approach: 1.a steel rod 20 mm dia is passed through a brass tube of 25mm internal dia and 30 mm external dia. the tube is 80 cm long and is closed by thin rigid washers and fastened by nuts, screwed to the rod. the nuts are tightened until the compressive force in the tube is 5kN. cal the stresses in the rod and tube. Es = 200 GPa; Eb= 80 GPa 2. a steel bolt of 16 mm dia passes centrally through a copper tube of internal dia 20 mm and external dia 30 mm. the length of the whole assembly is 500 mm. after tight fitting of the assembly, the nut is overtightened by quarter of a turn. what are the stresses induced in the nut and the bolt if pitch of nut is 2mm. Es = 200 GPa ; Ec = 120 GPa the key difference in the approach according to the book is that, for the first problem the elongation in rod and compression in tube is taken to be same.however for the second problem,the degree of elongation and compression is not taken equal. is approach correct for the second qtn ? Requesting an urgent response! Regards!! |
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