## Yield and Ultimate Strength

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.

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__**Expand Hint**

**Expand Hint**

Yield strength is the stress at which permanent (plastic) deformation is first observed.

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__**Hint 2**

**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 materialâ€™s yield strength.

The fastener will not break apart, but will likely be in a deformed or elongated state.

Similar Problems from FE Sub Section:

007. Aluminum Alloy Graphs

167. Material Crack

200. Critical Crack Length

349. Compressibility Modulus

354. Yield vs Ultimate Strength

358. Brittle vs Ductile vs Plastic

445. Fracture Toughness

455. Fracture Stress

Similar Problems from FE Section:

007. Aluminum Alloy Graphs

167. Material Crack

200. Critical Crack Length

349. Compressibility Modulus

354. Yield vs Ultimate Strength

358. Brittle vs Ductile vs Plastic

445. Fracture Toughness

455. Fracture Stress

**Mechanical**007. Aluminum Alloy Graphs

167. Material Crack

200. Critical Crack Length

349. Compressibility Modulus

354. Yield vs Ultimate Strength

358. Brittle vs Ductile vs Plastic

445. Fracture Toughness

455. Fracture Stress

Similar Problems from FE Section:

**Properties of Materials**007. Aluminum Alloy Graphs

167. Material Crack

200. Critical Crack Length

349. Compressibility Modulus

354. Yield vs Ultimate Strength

358. Brittle vs Ductile vs Plastic

445. Fracture Toughness

455. Fracture Stress