Destructive testing_Hardness Testing.pptx

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1. Destructive Testing Methods (Hardness Testing) Dr. A. M. Takale Mechanical Engineering Department Sharad Institute of Technology College of Engineering.

2. Introduction Definition: Hardness is a material's resistance to indentation or penetration. Importance: Hardness testing is used to evaluate a material's wear resistance, strength, and toughness. Types of Hardness Tests: Brinell Rockwell Vickers

3. . Brinell Hardness Test Principle: A hardened steel ball indents the material. Procedure:Apply a known load to the ball. Measure the diameter of the indentation. Calculate the Brinell hardness number (BHN). Advantages: Suitable for soft to medium-hard materials. Disadvantages: May not accurately measure the hardness of very hard materials.

4. Rockwell Hardness Test Principle: A diamond cone or steel ball indents the material. Procedure: Apply a minor load to the indenter. Apply a major load. Measure the depth of penetration. Calculate the Rockwell hardness number (HR). Types of Rockwell Scales: HRC (hardened steel), HRB (soft materials), HRF (very soft materials), etc.

5. Vickers Hardness Test Principle: A diamond pyramid indents the material. Procedure: Apply a known load to the pyramid. Measure the diagonal lengths of the indentation. Calculate the Vickers hardness number (HV). Advantages: Accurate for a wide range of materials, including very hard ones. Disadvantages: Requires a microscope for accurate measurement.

6. Factors Affecting Hardness Testing Load: Higher loads generally result in higher hardness values. Indenter: The type of indenter (ball, cone, pyramid) affects the hardness measurement. Surface Finish: Rough surfaces can influence hardness readings. Test Method: The specific hardness test method chosen can impact results .

7. Applications of Hardness Testing Material Selection: Choosing appropriate materials for specific applications. Quality Control: Ensuring product consistency. Research and Development: Studying material behavior and improving properties. Failure Analysis: Investigating the cause of material failures.

8. Modulus of Elasticity Definition: A measure of a material's stiffness. Calculation: Slope of the elastic portion of the stress-strain curve.

9. Conclusion Summary: Hardness testing is a vital tool for evaluating material properties. Importance: It provides valuable information for various industries and applications.

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