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Basic Mechanical Engineering by Pravin Kumar

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12

Stress and Strain

Chapter Objectives

In this chapter, you will learn about:

  • Stress and strain
  • Types of loading
  • Tensile testing
  • Relations among elastic constants
12.1  INTRODUCTION TO STRESS AND STRAIN

There are certain behaviours of all materials under the influence of external force. Stress and strain are one of the measures to show these behaviours. Stress is a resistive force per unit area, which is developed internally to oppose the external force subjected to the material. Strain is a measure of deformation of the material per unit dimensions. If the stress developed in the material is perpendicular to cross-section, it is known as direct stress and if it is tangential or parallel to cross-section, it is known as shear stress.

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