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CC BY V4.0, Open Access
Thesis
MODELING SHEAR AND PLASTIC STRAIN FOR LINEAR CORRUGATION AND STRAIGHTENING PROCESS
Washington State University
Master of Science (MS), Washington State University
01/2021
DOI:
https://doi.org/10.7273/000003127
Handle:
https://hdl.handle.net/2376/124322
Abstract
In this research a relatively newer severe plastic deformation (SPD) process was used to severely deform plates made of a Magnesium (Mg) alloy – AZ31. The alloy was produced by twin roll cast (TRC) and was received as such. The SPD process employed in this research to process square and thin plates of AZ31, is known as Linear Corrugation and Straightening (LCS). LCS has ability to produce nearly ultra fine-grained microstructure for a light metal alloy in one pass. LCS heats and maintain the temperature of the plate specimen, without the external need of a furnace, throughout the process. During LCS a heated AZ31 plate specimen is processed by a push-press-release cycle between a set of two dies, each having a 45o angle step. This corrugates the surface of the plate at intervals (with flexibility of regular or irregular, depending on the user) and also straightens the plate in a single pass by using the same set of dies. For this reason, LCS is called as a semi-continuous SPD process. For this research, four plates were processed, each having a different corrugating gap. This gap, however, was kept constant within one plate specimen. A 2D finite element (FE) model was developed for LCS process with the help of a finite element modeling (FEM) software program known as ABAQUS (student’s edition, by SIMULIA Corp.). ABAQUS/standard code was used for LCS modeling. Model results indicated higher ‘simple shear’ and ‘overall plastic’ strain accumulation for plates with lesser corrugating gap. Moreover, gradient trends in longitudinal and short transverse directions (LD and ST), for both overall plastic and simple shear strains were observed in the plate. Formation of dead zones, where both plastic and shear strains approached nearly zero, were also noted in the plates after LCS modeling. Optical microscopy results of processed plates indicated grain alignment of 45o in the processing direction (PD). Fine grains and large grains were stacked together in 45o bands, Microstructures also appeared to have a grain size gradient in LD and ST of plate’s cross section. Micrographs and LCS strain modeling results were correlated, and useful findings were discussed.
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Details
- Title
- MODELING SHEAR AND PLASTIC STRAIN FOR LINEAR CORRUGATION AND STRAIGHTENING PROCESS
- Creators
- Mueed Jamal
- Contributors
- David Field (Advisor)Jow Ding (Committee Member)Scott Beckman (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 164
- Identifiers
- 99900651899601842
- Language
- English
- Resource Type
- Thesis