Instability in Tensile Deformation
The exercise shows a 8" long tensile test specimen. The material obeys the flow stress = s = Ken behavior. Both engineering stress-engineering strain and true stress-true strain curves are shown.
The questions are:
The start of necking is easier to see on the engineering stress-engineering strain curve.
- At what value of engineering strain does necking start?
- What is the value of true strain at the onset of necking?
- Is the strain at the onset of necking related to the strength coefficient K?
- Is the strain at the onset of necking related to the strain hardening exponent n?
Click "Reset" to initialize.
After setting values for K and n, clicking "Start/Stop" will begin simulation of material deformation.
Both engineering stress-engineering strain and true stress-true strain curves are displayed.
The process can be stopped and restarted with "Start/Stop" button.
Procedures for answering the questions posed and a quantitative model of the onset of nonuniform deformation in tension are
© 2001 by Barney E. Klamecki. All rights reserved