The uniaxial compression test was selected to obtain flow (stress–strain)
behavior of plasticine. After preparing and placing the plasticine compression
test specimen between two plexiglass platens [10], they were then placed on
to Instron tension/compression testing machine which provided the required
load to deform the specimen. In these uniaxial compression experiments, different
types (colors) of plasticine, white and black, and of lubricants, vaseline
and talcum powder, and various deformation speeds, 5.1 mm/min (0.2 ipm) and
12.7 mm/min (0.5 ipm), were chosen accordingly design of experiment procedure
which will be explained in the next section. During the tests, data were taken
in the form of compression load against the deformation of specimen. Later on,
these data were used to obtain the true stress–true strain curve of different types
of plasticine specimens by using the well-knownpower law(Holloman) equation
σ = Kεn (1)
where n is the strain-hardening (work-hardening) exponent and K is the strength
coefficient. In this study, n = 0.167 and K= 0.143MPa were used for white plasticine
while 0.133 and 0.208MPa were taken as n and K parameters for black
plasticine, respectively.
The uniaxial compression test was selected to obtain flow (stress–strain)behavior of plasticine. After preparing and placing the plasticine compressiontest specimen between two plexiglass platens [10], they were then placed onto Instron tension/compression testing machine which provided the requiredload to deform the specimen. In these uniaxial compression experiments, differenttypes (colors) of plasticine, white and black, and of lubricants, vaselineand talcum powder, and various deformation speeds, 5.1 mm/min (0.2 ipm) and12.7 mm/min (0.5 ipm), were chosen accordingly design of experiment procedurewhich will be explained in the next section. During the tests, data were takenin the form of compression load against the deformation of specimen. Later on,these data were used to obtain the true stress–true strain curve of different typesof plasticine specimens by using the well-knownpower law(Holloman) equationσ = Kεn (1)where n is the strain-hardening (work-hardening) exponent and K is the strengthcoefficient. In this study, n = 0.167 and K= 0.143MPa were used for white plasticinewhile 0.133 and 0.208MPa were taken as n and K parameters for blackplasticine, respectively.
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