I need to built such a curve in order to calculate critical strain energy density of material (middle carbon steel) from it. Testing are being performed in a special testing setup, which provides rigid strain controled loading. The specimens are cilindrical with circumferential groow of relatively big radius. The problem is how to measure the actual cross-section area, after the moment of crack initiation inside the necking part of the specimen.
Also, is the strain-controlled loading nessesery to obtain correct complete true curve?
There are some useful details in the paper by Ancelet, which I hope help you.
Conference Paper Development of a New Measurement System for Tensile Testing
Thank you very much, Michael! I'll go through this paper if authors would be so kind to give me full-text.
Thank you, Arvind! I was thinking about unloading after UTS, then slise the specimen and simply measure the crack surfase, I guess it is the most accurate and simple way, but it means one specimen = one point on the curve... DCPD is a good idea, I'll think ower it.
DCPD method will be very difficult because there are many parameters which will affect the DCDP voltage like resistivity charge due to deformation etc. Better you unload after UTS and measure the slope. The difference between unloading slope and initial slope will give a measure of damage in material. Repeat this sequence up to the fracture of the sample.
- Badges
- Science topic
- Similar topics
- Correction