09-30+10-2-Lecture

09-30+10-2-Lecture - 1 Mechanical Properties of Materials...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 Mechanical Properties of Materials Part A ENGR 213 MECHANICAL PROPERTIES ➜ mechanical properties relate responses to loads ➜ ensure deformation not excessive and fracture precluded ➜ determined by experiment simulating service conditions ➤ Lab ➤ scale models ➜ standard tests ➤ American Society for Testing & Materials (ASTM) MECHANICAL PROPERTIES ➜ apply load uniformly over cross section ➜ static load or changing slowly w/ time ➜ tension ➜ compression ➜ Shear ➜ twist TENSILE TESTING OF METALS ➜ Tension test (LAB) ➜ elongate @ constant rate to failure ➜ measure applied load; elongation ➜ Usually on sample with specific geometry ➤ Gauge length should be at least four times the diameter. 5 Tensile Test Apparatus 6 Stress and Strain ➜ To eliminate effect of sample area, define stress & strain as follows ➜ engineering stress ➤ Ao - original area ➤ Units - psi or Mpa = 1E6 N/m 2 ➜ engineering strain ➤ lo - original length ➤ li - instantaneous length ➤ Unitless A F = σ l l l l l i ∆ =-= ε 145 psi = 1 MPa ELASTIC DEFORMATION...
View Full Document

This note was uploaded on 03/26/2008 for the course ENGR 213 taught by Professor Dr.stubbs during the Fall '04 term at Texas A&M.

Page1 / 19

09-30+10-2-Lecture - 1 Mechanical Properties of Materials...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online