Experiment 2 Basic Mechanical Properties ENG45 Properties of

Experiment 2 – Basic Mechanical Properties ENG-45, Properties of Materials Department of Chemical Engineering and Materials Science University of California, Davis Folsom Dam Gate Failure, July 1995 Matt Camilleri and Mike Meier, 2004

Objectives Understand Mechanical Testing: 1. Methods 2. Meaning of specific mechanical properties 3. Tensile and hardness testing Instron image

Instron image

Tensile Specimens and Apparatus

Tensile Test Concept

Tensile Test Concept Crosshead & Load Cell Clamp Specimen Clamp

Tensile Test Concept

During the Tensile Test

Force During the Tensile Test Elongation

Results and Analysis

Stress (Mpa) Results and Analysis Cold Rolled 1018 Steel C 2600 Brass, half hard Copper 6061 -T 651 Aluminum Strain (mm/mm) Annealed 1018 Steel

Hardness Testing Apparatus

Hardness Testing Concept Indentor Sample

Hardness Testing Concept Pre-Load Indentor Sample

Hardness Testing Concept Load Indentor Sample

Hardness Testing Concept Load Released Indentor d 1 Sample

Hardness Testing Concept Indentor d 2 Sample

Results

Summary • Force-elongation vs. stressstrain. • Elastic vs. plastic deformation. • Young’s modulus, yield strength, tensile strength, strain hardening, ductility, energy capacity, plus hardness. • Material selection & trade-offs. • Other mechanical tests.