Yield and Ultimate Strength

#495 / Materials Science Easy

Consider some hand calculations were performed to determine if a certain fastener selection could handle a specified tensile shock load. If the margins of safety for the yield strength are negative but the margins of safety for the ultimate strength are positive, describe what will likely happen to the fastener mechanically if the specified load were applied.

Expand Hint
Yield strength is the stress at which permanent (plastic) deformation is first observed.
Hint 2
Ultimate strength is the max allowable stress a material can endure.
Yield strength is the stress at which permanent (plastic) deformation is first observed. Since the margins are negative for yield strength, the fastener will likely deform/warp into an elongated/damaged shape, making it difficult to disassemble or assemble post load.

Ultimate strength is the max allowable stress a material can endure. Because the margins are positive for ultimate strength, the fastener will not break apart, but will likely be in a deformed state due to the applied load being greater than the material’s yield strength.
The fastener will not break apart, but will likely be in a deformed or elongated state.


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