import cyclic Stress-Strain Data (Bauschinger)

[Allanon37]

Hi,

I want to import a cyclic stress strain curve into my model (Uploaded picture). Modelling of non-linearisotropic/kinematic materialbehavior by means of constitutive material description according to Lemaitre-Chaboche.

I only have the stress strain data of cyclic tests. The options are "Hardening: combined" and "data type: stabilized". My Problem is that the strain data has to be increasing in Abaqus. But the cyclic tests include negative strains. How do I avoid this problem?

If I chose the data to be "parameters" I have no informations about Q_infinity, Hardening Parameter b, Kinematic Hardening C1 and Gamma1. Are those parameters obtainable from Cyclic Tests?

Best regards and thanks for your help.

 

[rmx]

Hi, I don't know how to import directly the cyclic stress strain curve directly into Abaqus.
However, if I remember correctly, if you choose a combined hardening model you can input directly the parameters describing the isotropic hardening (Q_infinity and b) and the kinematic hardening (two parameters C_i and Gamma_i for each number of backstresses you want to use for your model).
You can obtain these parameters by fitting the test data that you have with the model's equations. Have a look in the manual at 23.2.2: "Nonlinear isotropic/kinematic hardening model" and "Usage and calibration of the kinematic hardening models".