Mechanical Properties 101: Stress, Strain, and Hardness Tests | Machine Design - Lecture 3B

If you're just starting out in mechanics of materials or need a refresher on the fundamentals, this video covers the key concepts you need to know. We walk through a typical tensile test setup, break down the stress-strain curve, and highlight the material properties that matter most—like yield strength, Young’s modulus, and ductility.

You'll also learn about the four main types of loading—axial, shear, bending, and torsion—and how they affect how materials deform and fail. Finally, we introduce the concept of material hardness, how it's measured, and why it's important for design and failure prevention.

We’ll cover:
✅ Tensile testing: what it is and how it works
✅ How to read and interpret stress-strain curves
✅ The four fundamental types of loading
✅ What material hardness is and how we measure it

By the end of this video, you'll understand how materials respond to different kinds of loading, how to extract properties from test data, and what to look for when selecting materials for mechanical design.

Timestamps:
00:00 - Introduction
01:27 - Tensile test setup
04:59 - Stress-strain curve explained
07:08 - Material properties from test data
12:11 - Types of loading (axial, shear, bending, torsion)
17:26 - Material hardness
22:14 - Example hardness questions
26:35 - Wrap up

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