L05_Stress%20and%20Strain-08

L05_Stress%20and%20Strain-08 - EAS 209-Spring 2008...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
EAS 209-Spring 2008 Instructors: Christine Human Gilberto Mosqueda 1/23/2008 1 Lecture 05-stress and strain Lecture 5: Chapter 2 Stress and Strain under Axial Loading Design of machines and structures that are safe and function properly requires an understanding of the mechanical behavior of the materials being used. These properties of different materials are ordinarily measured in the laboratory. The most common test is the uniaxial tension test. Of interest is the stress-strain relationship. Recall Stress: A P = σ , Strain: L δ ε = Tests are conducted in accordance with standard protocols. In the U.S. one of the major standards organizations is the American Society of Testing and Materials e.g. ASTM E8-04: Standard Test Methods for Tension Testing of Metallic Materials. EAS 209-Spring 2008 Instructors: Christine Human Gilberto Mosqueda 1/23/2008 2 Lecture 05-stress and strain Uniaxial Tension Test Apply a force P Measure the elongation δ with an extensometer 2 nd dial gage often measures change in diameter From P and δ plot the stress-strain curve 0 A P = σ 0 L δ ε = Standard coupon D=0.505 in L (gage length) = 2.0 in The elongation is measured over the gage length
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon