Feasibility

MSA P11213

Base Plate Feasibility• 3 plastics were looked at for MSA mounting board material: ABS, Acrylic,

and polypropylene.• Due to cost requirements, cheapest material (polypropylene) analyzed

first, but discarded due to too much deflection. • Acrylic being cheaper than the ABS sheet was analyzed and was found

structurally feasible.• Following is the analysis of a load factor of safety of 5 times the max MSA

weight. 25lbs• In this very conservative analysis, max strain is .025”, which is considerably

less than any deflection noticeable enough to affect MSA performance. Stress values are approximately 10 times less than the yield stress of 10200psi.

25 lb force in middle of plateSupported by 4 outer bolt holes.Factor of safety 5 times greater than Max allowable MSA weight.

Strain

Equivalent Stress

Max Principal Stress

Pin Feasibility• Other than plastic base, pinned connections are only other area of

concern for structural feasibility.• ¼ inch clevis pins have been selected to make the pinned hinged

connections between the links.• Hand calculations were performed on pin in shear and bearing stress on

link for 5lb force and passed for yielding of the parts.• ANSYS workbench used to verify hand calculations as well as test higher

loadings to ensure factor of safety.

25 lb force applied to the top of the link. This is a loading factor five times greater than max MSA weight.

Pin deformation

Pin Equivalent Stress

Pin Max Principal Stress

Equivalent Stress on Link Hole