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Unformatted text preview: ASSIGNMENT NO.7 Assignment problem #1 (20 out of 100) The circular shaft shown in the figure is made of a material that can carry a maximum allowable shear stress of 60MPa. The shear modulus of the material is G=80GPa. Under the maximum allowable torque applied at point D find the twisting angle at point D. Note that between A and B the section is hollow. Solution For region AB ( ) 4 4 4 4 50 35 749.5 10 2 J mm = = (1pts) max 60 c T MPa J = = Allowable torque 4 6 max 60 749.5 10 8.95 10 8.95 50 J T Nmm kNm c = = = = (3pts) For region BC ( ) 4 4 4 50 981.3 10 2 J mm = = (1pts) max 60 c T MPa J = = Allowable torque 4 6 max 60 981.3 10 11.78 10 11.78 50 J T Nmm kNm c = = = = (3pts) For region CD ( ) 4 4 4 40 401.9 10 2 J mm = = (1pts) max 60 c T MPa J = = Allowable torque 4 6 max 60 401.9 10 6.03 10 6.03 40 J T Nmm kNm c = = = = (3pts) The allowable torque is 6.03kNm since it is the minimum value among the three regions. (3pts) 6 6 6 3 4 3 4 3 4 1 6.03 10 400 6.03 10 100 6.03 10 500 1.42 80 10 749.5 10 80 10 981.3 10 80 10 401.9 10 n i i i i i T L rad G J = = = + + = (5pts) Assignment problem #2 (20 out of 100) Find the shear centre of the thinwalled section in the figure...
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This note was uploaded on 08/22/2011 for the course ENG 48331 taught by Professor Brown during the Three '11 term at University of Technology, Sydney.
 Three '11
 BROWN
 Shear Stress, Shear, Stress

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