Friction Coefficient in Hot Compression of Cylindrical Sample

Li, Yunping; Onodera, Emi; Chiba, Akihiko

doi:10.2320/matertrans.m2010056

Cited by 49 publications

(37 citation statements)

References 7 publications

(7 reference statements)

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“…During compression processing, adiabatic heating and interfacial friction between the specimen and anvils have great influences on the mechanical responses of the materials [10]. However, in this study the effects of these two factors on the flow stress-strain curve in the Thermal/Mechanical Simulator were not considered.…”

Section: Introductionmentioning

confidence: 95%

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Correction of Flow Curves and Constitutive Modelling of a Ti-6Al-4V Alloy

Dong

Zhang

et al. 2018

Metals

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Abstract:Isothermal uniaxial compressions of a Ti-6Al-4V alloy were carried out in the temperature range of 800-1050 • C and strain rate range of 0.001-1 s −1 . The effects of friction between the specimen and anvils as well as the increase in temperature caused by the high strain rate deformation were considered, and flow curves were corrected as a result. Constitutive models were discussed based on the corrected flow curves. The correlation coefficient and average absolute relative error for the strain compensated Arrhenius-type constitutive model are 0.986 and 9.168%, respectively, while the values for a modified Johnson-Cook constitutive model are 0.924 and 22.673%, respectively. Therefore, the strain compensated Arrhenius-type constitutive model has a better prediction capability than a modified Johnson-Cook constitutive model.

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Section: Introductionmentioning

confidence: 95%

“…Although graphite was used to lubricate the contacting surface, the friction coefficient at high temperatures cannot be lowered to a negligible level [10]. The friction corrected flow stress can be calculated using the following equations [25]:…”

Section: Friction and Temperature Corrected Approachmentioning

confidence: 99%

Correction of Flow Curves and Constitutive Modelling of a Ti-6Al-4V Alloy

Dong

Zhang

et al. 2018

Metals

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“…Previous research showed that the traditional correction of -" curves including both friction factor determination and friction correction potentially has a severe shortcoming, because the compressed sample was supposed to be very thin and it is assumed that there is no barreling in the edges of the sample, that is, the thickness is small enough and the average axial stress z is constant across the height of sample. 12,13) However, in an actual cylindrical hot working process, the thickness of sample is generally higher than the radius of a sample. The stress across the height of a sample is considered not to be constant.…”

Section: Resultsmentioning

confidence: 99%

“…The corrected stresses of sample can be calculated when the flow stress and friction factor, m are substituted into the following equation based on a previous research, 13)…”

Section: Resultsmentioning

confidence: 99%

Construction of Processing Map for Biomedical Co-29Cr-6Mo-0.23C-0.14N Alloy by Using Compression Tests

Yamashita

Matsumoto

et al. 2011

Mater. Trans.

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The high-temperature deformation behavior of Co-29Cr-6Mo-0.23C-0.14N alloy was investigated by carrying out compression tests; the tests were carried out in the temperature range of 1000-1200 C and strain rates ranging from 0.01 to 30 s À1 with a height reduction of approximately 65%. The optimum hot-working conditions were determined from the processing map based on the dynamic materials model. Dynamic recrystallization was observed to occur over the entire temperature and strain rate range. However, uniformly sized grains were formed for strain rates higher than 1 s À1 , which is considered to be the optimum hot-working condition. In addition, authors suggested that in extremely low stacking fault energy alloy, explosive and homogeneous formation of mechanical twinning should be considered to be stable state, and new processing map with more detailed description of deformation mechanism seems necessary in future.

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“…For example, in Split Hopkinson Pressure Bar experiments, it is important that stress equilibrium is reached inside the specimen: the sample should be sufficiently thin to obtain >3 internal reflections of the stress wave. The sample diameter should be both less than the diameter of the bars, and sufficiently small to ensure that any stresses due to radial inertia are negligible [1].…”

Section: Introductionmentioning

confidence: 99%

Aspect ratio compression effects on metals and polymers

Khan

Balzer

Wilgeroth

et al. 2014

J. Phys.: Conf. Ser.

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Abstract. Previous research has studied the effects of altering the shape and size of samples over a range of compression rates. Several discrepancies exist in the published data, probably due to the wide range of techniques used. The research here was carried out to bridge this gap. Cylindrical polycarbonate and aluminium (6082) samples, with varying aspect ratios, were subject to a range of strain rates between 10 −4 -10 2 s −1 , with further data gained for polycarbonate at higher strain rates between 10 2 -10 3 s −1 , and the stress-strain relationships obtained, compared and discussed. IntroductionThe range of strain rates examined here were achieved using quasi-static, drop-weight tower, and Split Hopkinson Pressure bar (SHPB) techniques. All the experiments were carried out at ambient temperature and humidity.To ensure the validity of results for a given experimental technique, sample dimensions and ratios must complement the load and loading rate. For example, in Split Hopkinson Pressure Bar experiments, it is important that stress equilibrium is reached inside the specimen: the sample should be sufficiently thin to obtain >3 internal reflections of the stress wave. The sample diameter should be both less than the diameter of the bars, and sufficiently small to ensure that any stresses due to radial inertia are negligible [1].Here we present results over a wide range of strain rates. The effects of sample geometry on the mechanical behaviour of aluminium 6082 and polycarbonate are investigated.Polycarbonate is an amorphous thermoplastic polymer with high transparency and toughness, and has a large variety of applications. It has an average density of 1.20 g cm 3 and a glass transition temperature of +148 • C. The aluminium 6082-T6 (BS EN755) has a density of 2.70 g cm 3 and a melting point of +650 • C. The chemical composition in this aluminium alloy is 0.97% silicon, 0.71% magnesium and 0.51% manganese, with trace amounts of iron, titanium, copper, zinc and chromium. The alloy has been solution heat treated and artificially aged (precipitation hardened).Cylindrical samples have been machined to a constant diameter of 4 mm and thicknesses of 1 -12 mm. The samples will henceforth be designated by their aspect ratios (ratio of length to diameter), and will range between 0.25 -3.

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Friction Coefficient in Hot Compression of Cylindrical Sample

Cited by 49 publications

References 7 publications

Correction of Flow Curves and Constitutive Modelling of a Ti-6Al-4V Alloy

Correction of Flow Curves and Constitutive Modelling of a Ti-6Al-4V Alloy

Construction of Processing Map for Biomedical Co-29Cr-6Mo-0.23C-0.14N Alloy by Using Compression Tests

Aspect ratio compression effects on metals and polymers

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