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Investigation and implementation of nonlinear micro plasicity in abaqus
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis is aimed to investigate different approaches in FEM simulation of sheet metal

forming to accurately predict the final geometry. These approaches are mainly focused

on the behavior of material models used in the forming process. Two sets of test results

are available that play important roles in this project. The first set is the cyclic test which

depicts the behavior of the material model in large deformations. The material model in

simulations is modified according to the cyclic test results. Second set of tests is Bending

Under Tension (BUT) test which represents the forming process of sheets. BUT test is

simulated with the material model that is modified according to the cyclic test results.

The deformed profiles of the BUT simulations are compared with BUT test results to

check the accuracy of the modified material models.

The influence of friction on the final geometry in the BUT simulations is investigated. All

of the modified material models are implemented in simulations with and without

considering friction and the results are compared. Friction provides a realistic condition

in BUT simulation and has a great impact in spring-back results. Friction reduces the

bending stiffness of sheets and consequently the more spring-back is observed. The

modified model with single step reduction in elastic modulus (with friction) makes an

improvement in prediction of spring-back magnitude in BUT simulation.

Place, publisher, year, edition, pages
2011. , 49 p.
, Degree Project in Production Engineering, Second Level, 493
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-92005OAI: diva2:511820
Subject / course
Production Engineering
Educational program
Master of Science - Engineering Mechanics
Available from: 2012-09-19 Created: 2012-03-23 Last updated: 2012-09-19Bibliographically approved

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