Strain rate effects on the deformation behaviour and fracture mode of recycled aluminium alloys reinforced alumina oxide
In recent years, reinforcement with alumina oxide (Al2O3) has been considered to enhance the mechanical characteristics of recycled aluminium alloys. However, there is no established information on the deformation behaviour of such recycled material when subjected to various loading conditions, i...
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Format: | Thesis |
Language: | English English English |
Published: |
2023
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Online Access: | http://eprints.uthm.edu.my/11049/1/24p%20NORZARINA%20MA%E2%80%99AT.pdf http://eprints.uthm.edu.my/11049/2/NORZARINA%20MA%E2%80%99AT%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/11049/3/NORZARINA%20MA%E2%80%99AT%20WATERMARK.pdf http://eprints.uthm.edu.my/11049/ |
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Summary: | In recent years, reinforcement with alumina oxide (Al2O3) has been considered to
enhance the mechanical characteristics of recycled aluminium alloys. However, there
is no established information on the deformation behaviour of such recycled material
when subjected to various loading conditions, including damage progression. In
addition, minimal efforts were conducted to develop numerical modeling to predict the
deformation behaviour. Based on this motivation, a hybrid experimental-numerical
approach is used in this research project. A hot press forging method is used to produce
the specimen. The deformation behaviour, including damage progression of recycled
AA6061 reinforced alumina oxide was investigated using the uniaxial tensile test at
different strain rates (6×10-3 – 6×10-1 s-1) and the Taylor cylinder impact test at impact
velocity ranging from 190 m/s – 370 m/s. The recycled AA6061 reinforced alumina
oxide exhibits a strain-rate dependence behaviour and ductile-brittle elastoplastic from
the experimental work. The mechanical properties of the recycled AA6061 reinforced
alumina oxide are degraded due to the behaviour of alumina oxide (brittle) and damage
progression under loading deformation. The Taylor cylinder impact tests showed three
fracture modes (mushrooming, tensile splitting, and petalling) with a critical impact
velocity of 280 m/s and also exhibits plastic anisotropic behaviour and antideformation
solid capability. The increasing impact velocity increases the severity of
damage progression of the recycled AA6061 reinforced alumina oxide. Metallurgical
analysis showed that micro-voids were initiated in the pre-test specimen, and damage
evolved due to the nucleation, growth, and coalescence of micro-voids when loading
was applied. The numerical approach was performed in the finite element analysis
using LS-DYNA to predict the deformation behaviour of recycled AA6061 reinforced
alumina oxide. The Simplified Johnson-Cook model was chosen and the input
parameters characterize based on uniaxial tensile test data. The simulation result was
then validated against both tests' experimental data and showed a satisfactory
agreement |
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