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Use Transverse Strain Data in a Material Model Calibration

Introduction

If you perform uniaxial tension or compression experiments, then it is useful to also record the transverse strain during the test. This article shows how you can use this data to calibrate a suitable material model.

Step 1: Experimental Data

First make sure your experimental data file contains both the standard columns [time, strain, stress], and a column for the transverse strain. Here is an example:

				
					% column 1: Time [s]
% column 2: Engineering Strain
% column 3: Engineering Stress [MPa]
% column 4: Transverse Strain
0, 0, 0, 0
0.010038001, 0.00021036632, 0.4261087, -3.1511109e-05
0.020076003, 0.00042073265, 0.85221743, -6.3022219e-05
0.030114004, 0.00063109897, 1.2784391, -9.4533328e-05
0.040045722, 0.00083428696, 1.704824, -0.00012367787
0.049930192, 0.0010342838, 2.1313721, -0.00015177036
0.059814662, 0.0012342807, 2.5579185, -0.00017986286
. . . 
				
			

Step 2: Set Load Case in MCalibration

Read in the experimental data file into MCalibration, and make sure you assign fitness weight factor for the transverse strain. The value of this factor tells MCalibration how important the transverse strain is for the calibration.

Step 3. Set Material Model

Make sure the bulk modulus parameters are selected to be optimized. For the PolyUMod TNV model, also make sure you select the volumetric flow parameter bb to be searched for. Finally, just run the material model calibration!

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