Stress, Strain and Stiffness

≈ 32 min

Normal stress is force divided by area, while strain is extension divided by original length. Young's modulus is the elastic stress-strain slope.

Core checkpoint: Strength limits failure; stiffness limits deformation, and they are not the same property.

Which statement best captures the core checkpoint for Stress, Strain and Stiffness?

Strength limits failure; stiffness limits deformation, and they are not the same property.

Choose a solution before defining the evidence.

Ignore units, limits and boundary cases.

Assume the first result applies in every context.

Enter the highlighted key term for Stress, Strain and Stiffness. Checkpoint clue: Which property relates elastic stress to strain?

Which lesson most directly explains the concepts used in this application?

A long-span member may meet strength limits but still deflect too much for service.

Stress, Strain and Stiffness

The Engineering Design Cycle

Requirements, Constraints and Trade-offs

none of these concepts