Assignment $3$

MECN$2026$A

Deadline:$28/10/2024$

A bracket attached to a fixed member by four identical bolts and weld, which experiences a fluctuating force which varies between $0$ and $20$ N $.$ Because of safety considerations, SAE class $8\mathrm{.}8$ steel bolts and a minimum safety factor of $3($based on proof strength$)$ are to be used. Showing all relevant steps, determine an appropriate bolt diameter and required weld height $h.$ Neglect friction forces between the bracket and fixed member. The allowable shear stress in the weld throat is $120$ MPa $.$

Sut $=600$MPa,$Sy=500$MPa $($welding material$)$

Sut$=400$MPa,$Sy=300$MPa $($Bracket and fixed member$)$