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Low cycle fatigue/Ratcheting

Hi viewers,

I am working with  abaqus 6.7 software. I wish to simulate uni-axial tension and compression cyclic analysis. My objective is to predict the response of steel subjected to cyclic load and in particular, to predict ratcheting effect. I am also interested to draw S-N curve, stress-strain curve, ratcheting behaviour, etc. from the result of the analysis. I tried to simulate an axi-symmetric model and job submission is successfully completed. But I am not aware of the fact that how the  results of analysis can be retrieved to draw the above mentioned curves, please specify how the 'no.of cycle' data can be obtained.

 

Pradip 

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Hi Pradip,

 You are tackling two different problems here, an HCF one with S-N diagram, and an LCF one with ratchetting and incremental plastic strain accumulation. While I am not particularly proficient with ABAQUS (I mostly use ANSYS and LS-DYNA), I know that most solvers use the Rain Count method to evaluate the HCF life of a component. This is a a fairly simple tool anyway and the FEA component does not go far beyound static elastic analysis.

Regarding LCF, this is significant in terms of calibrating and implementing the material model. If I am not mistaken, the best model by far is Chaboche model.

 I hope this quick note helps.

Mohammad

B.Pradip

Hello mohammad,

 Thanks for you reply. But it will not exactly help to overcome the bottlenecks of my work.

 

The stress-strain curve and ratcheting behaviour (strain accumulation vs # of cycle) should be easily obtained from the .DAT files from ABAQUS. For ratcheting damage, you may want to calculate the # of cycle to reach the "critical" ratcheting limit, as pointed out in "Kapoor A. A re-evaluation of
the life to rupture of ductile metals by cyclic plastic strain. Fatigue Fract
Eng Mater Struct 1994;17:221-219".

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