Parameters Calibration of the Combined Hardening Rule through Inverse Analysis for Nylock Nut Folding Simulation

Locking nuts are widely used in industry and any defects from their manufacturing may cause loosening of the connection during their service life. In this study, simulations of the folding process of a nut's ange made from AISI 1040 steel are performed. Besides the bilinear isotropic hardening...

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Bibliographic Details
Published in:Computer modeling in engineering & sciences 2021-01, Vol.128 (1), p.87-108
Main Author: Kacar, İlyas
Format: Article
Language:English
Subjects:
Bilinear Isotropic Hardening
Calibration
Chaboche Kinematic Hardening
Compression tests
Curve fitting
Deformation
Diameters
Dimensional analysis
Engineering
Fatigue tests
Folding
Genetic Algorithm
Kinematics
Locking
Low cycle fatigue
Manufacturers
Manufacturing
Medium carbon steels
Methods
Nuts
Nylock Nut Folding
Optimization
Parameters
Service life
Simulation
Strain hardening
Tensile tests
Yield criteria
Yield stress
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Description
Summary:Locking nuts are widely used in industry and any defects from their manufacturing may cause loosening of the connection during their service life. In this study, simulations of the folding process of a nut's ange made from AISI 1040 steel are performed. Besides the bilinear isotropic hardening rule, Chaboche's nonlinear kinematic hardening rule is employed with associated ow rule and Hill48 yield criterion to set a plasticity model. The bilinear isotropic hardening rule's parameters are determined by means of a monotonic tensile test. The Chaboche's parameters are determined by using a low cycle tension/compression test by applying curve fitting methods on the low cycle fatigue loop. Furthermore, the parameter calibrations are performed in the finite element simulations by using an optimization approach based on the inverse analysis. Dimensional accuracy for the nut is of primary concern due to the tolerance constraints of the nut manufacturers. Experimental diameter and height measurements of the folded locking nut are compared with those obtained from the optimized model. The results reveal that the folding dimensions can be predicted more accurately when the model parameters are determined by using the combined hardening rule. The calibrated parameters are presented for the folding and cycling deformation processes.
ISSN:1526-1492
1526-1506
1526-1506
DOI:10.32604/cmes.2021.015227