What this chapter is about
While previous chapters treated objects as rigid bodies, real materials deform when forces are applied. A steel rod stretches when pulled, rubber compresses when squeezed, and concrete cracks under excessive load. Understanding how materials respond to applied forces—how much they deform and whether they return to original shape—is crucial for engineering, construction, and material science. The concepts of stress (applied force per unit area) and strain (fractional deformation) provide quantitative measures of these responses. Elasticity describes materials that return to original shape when force is removed, while plasticity describes permanent deformation. These properties determine material suitability for different applications: steel for structural supports, rubber for shock absorption, ceramics for heat resistance. This chapter explores the fundamental principles governing material deformation, elastic properties, and the limits of mechanical behavior.
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Learning objectives
- 1Explain stress, Strain, Elasticity, and Deformation
- 2Explain sTRESS AND STRAIN
- 3Explain definition of Stress
- 4Explain types of Stress
- 5Explain definition of Strain
- 6Explain relation Between Stress and Strain