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Find the efficiency of the double riveted double cover butt joint having plate thickness 20mm with rivets having a pitch of 100mm. Permissible tensile stress

Find the efficiency of the double riveted double cover butt joint having plate thickness 20mm with rivets having a pitch of 100mm. Permissible tensile stress is 120MPa, permissible shear stress is 90MPa and permissible crushing stress is 180MPa.

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