Mechanical engineeringLesson 1 of 4 in the course Strength of materials

Strength of Materials: Stress, Failure, and Design

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Strength of materials explains how structural members respond to forces and how engineers assess their ability to carry loads safely. This lesson introduces the relationship between a member’s geometry, material, loading, stress, and deformation.

A structural member may be a beam, column, shaft, or another component that carries loads. Its response depends on its material properties—such as yield strength and Young’s modulus—and its geometry, including length, width, thickness, holes, and other changes in shape. Supports and other boundary constraints also affect how the member can move or deform.

All flashcards

What is uniaxial stress?
Force per unit area under uniaxial loading: σ=F/A\sigma = F/A.
How is average axial strain calculated for a uniform bar?
Divide the change in length by the original length: ε=ΔL/L0\varepsilon = \Delta L/L_0.
What is deflection?
The displacement of a structural element under a load.
What is a factor of safety?
The selected material strength or allowable limit divided by the actual service stress.
What is plastic deformation?
Permanent strain that remains after the load is removed.

Quiz questions

  1. Which stress marks the lowest stress that produces permanent deformation?Answer: Yield strength.
  2. Using a UTS of 440 MPa and a factor of safety of 4, what allowable stress results from dividing UTS by the factor of safety?Answer: 110 MPa.
  3. What can happen under repeated loading even when stress remains below yield strength?Answer: Fatigue failure can occur after many load cycles.
  4. Which listed failure theory is intended for brittle materials?Answer: Maximum normal stress theory.
  5. Which strengthening mechanism can increase yield strength by reducing grain size?Answer: Grain boundary strengthening.

Based on the Wikipedia article Strength of materials, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.

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