PHYS 270 Chapter Notes - Chapter 3: Shear Modulus, Infinitesimal Strain Theory, Plane Stress
Document Summary
Tension test - standard specimen are placed in a tension-test machine where they are gripped at each end and pulled in the axial direction. Lo = gage length (distance between 2 marks) = deformation (movement of the 2 marks) Proportional limit the end of linear region obtained when force is applied (in curve above, oa) Ultimate stress the largest stress point on the stress-strain curve (in curve above, d) Fracture/rupture stress stress at breaking point (in curve above, e) Elastic region where material regains its original shape when applied force is removed. Plastic region where material is deformed permanently. Yield point the point demarcating the elastic from the plastic region. Yield stress stress at the yield point. Offset yield stress correspond to a plastic strain at point i. Ductile materials can undergo large plastic deformations before fracture. Brittle exhibiting little or no plastic deformation. Hardness a material"s resistance to scratches and indentation (not its strength)
