Machine Design_slide 13

# Machine Design_slide 13 - ENGR3220MachineDesign...

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ENGR 3220 – Machine Design ENGR 3220 – Machine Design Week 8, Lecture 2 Week 8, Lecture 2 Shear Joints, Welding Shear Joints, Welding

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Bolted and Riveted Joints Loaded in Bolted and Riveted Joints Loaded in Shear Shear b m r A F A F A F - = = = σ τ If the loading is a shear force, following stress must be considered: Shear stress: Tensile stress: Bearing stress: Where A r is cross section area of the riveted joints, A m is cross section area of the member part and A b is projected area of the joint.
Shear Joints with Eccentric Loading = + + + + + + + + = = + + + + + + + + = - - i n i i n i n i i n A y A A A A A A y A y A y A y A y A y A x A A A A A A x A x A x A x A x A x 1 1 5 4 3 2 1 5 5 4 4 3 3 2 2 1 1 1 1 5 4 3 2 1 5 5 4 4 3 3 2 2 1 1 Shown in left, A1 to A5 are the respective cross-sectional area of a group of 5 pins, or rivets, or bolts. The rotational pivot point lines at the centroid of the cross-sectional area pattern of the pins, rivets, or bolts, using statics, the coordinates of centroid G are given by:

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Shear Joints (a) Beam bolted at both ends with distributed load; (b) free-body diagram of beam; (c) enlarged view of bolt group centered at O showing primary and secondary resultant shear forces
Shear Joints n V F / ' = Primary shear force: ... " 2 2 2 2 1 + + + + = D C B A n n r r r r r M F Secondary shear force:

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Example 1 Shown in left is a 15-by 200- mm rectangular steel bar cantilevered to a 250- mm steel channel using four tightly fitted bolts located at A,B,C and D. For a F=16 kN load find 1) The resultant load at each bolt 2) The maximum shear stress in each bolt 3) The maximum bearing stress 4) The critical bending stress in the bar. E F
Example 1

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8 WELDING WELDING Definition: Material joining process. Two parts connected at their contacting surfaces by suitable heat and pressure. Many welding processes are accomplished
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## This note was uploaded on 04/16/2011 for the course ENGR 3220 taught by Professor Turro during the Spring '11 term at UOIT.

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Machine Design_slide 13 - ENGR3220MachineDesign...

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