Plot tensile curve

[posi972]

Hello, after using DICe, I would like to plot tensile curves for my mechanical tests. My main problem is how to obtain the strain for each deformed image. For each picture: • Is it better to calculate the average displacement_Y of the subset, then divide by the gauge length, • Or should I average the vsg_strain_yy Thanks for your help.

[dicengine]

I'm not sure I understand what you are attempting to compute. Do you want the average strain in the sample? This seems to defeat the purpose of using a full field tool like DIC.

[posi972]

Initially, I'd like to extract data such as modulus of elasticity. But I don't know the best way of compute the strain to draw a tensile curve. And I was wondering if this was possible using the data obtained with DICe.
And as a second step, I'm going to plot the full strain field for each image (hence the use of DIC).

[dicengine]

Most people calibrate a finite element model to the full field DIC data, using the elasticity parameters as the calibration unknowns. There are lots of papers on this, you might look under the topic of finite element model updating or the virtual fields method. If all you want to do is get the modulus from a stress strain curve you could just use the y displacements for a subset at the top and bottom of the gauge section over the gauge length as you said.

[posi972]

I'll look into the finite element model. Thank you very much for your reply!