Improving the Sensitivity of T-Shape Test to Friction Conditions for the Evaluation of Friction Behaviour in Microforming

Taureza, Muhammad; Castagne, Sylvie; Aue‐u‐lan, Yingyot

doi:10.4028/www.scientific.net/kem.447-448.386

Cited by 2 publications

(2 citation statements)

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“…In the current study, the changing contact pressure was obtained by introducing a known deformation depth from the asperity, which is equivalent to the asperity overlap in the simulation works inspired by Green. Taureza et al [35,36] and the geometry of the tested specimen (flange and total height, Figure 12) can be characterized to deduce the prevailing friction existing during the test [37].…”

Section: Discussionmentioning

confidence: 99%

Depth-dependent stress–strain relation for friction prediction

Taureza

Song

Castagne

2014

International Journal of Mechanical Sciences

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The effect of strain gradient on mechanical property of material is implemented through depth-dependent stress strain relation model in conventional finite element simulations for use in friction prediction. For the incorporation of strain gradient effect, contact simulation involving asperities was developed with the assumption that the deformation pattern created by asperities from tool surface in microforming is comparable to the deformation created by the indenter in a hardness test. Consequently, depth-dependent stress-strain relation was derived from the indentation size effect model and this stress-strain relation was used in a simulation to show the effect of strain gradient to friction behaviour in microforming at different surface roughness levels. Experiment was conducted alongside the simulation and the results showed that with asperity ploughing considered as major contributor to friction in microforming at room temperature, the simulation involving depth-dependent material properties is able to predict the better predict the friction behaviour as compared to its continuum simulation counterpart.

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Section: Discussionmentioning

confidence: 99%

Depth-dependent stress–strain relation for friction prediction

Taureza

Song

Castagne

2014

International Journal of Mechanical Sciences

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“…In order to filter the influence of mechanical properties size effects during miniaturization, stroke (displacement of moving die during the test) is proposed to replace load as independent variable. Consequently, both the load and the evolution of the workpiece geometry would be recorded as a function of the stroke, as described by Taureza et al (2010). Furthermore, the original 1:1 cylinder aspect ratio is replaced with a workpiece with the length to diameter ratio (l/d) of 5 or higher.…”

Section: Plane Strain Test With Existing Geometrymentioning

confidence: 99%

The influence of die geometry and workpiece mechanical properties in T-Shape friction test

Taureza

Castagne

Aue‐u‐lan

et al. 2012

Journal of Materials Processing Technology

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a b s t r a c tIn this study, T-Shape friction test was redesigned to make it more suitable for application to microforming processes. Workpiece with aspect ratio (length/diameter) of 5 was proposed in order to ease workpiece handling. The die geometry was also modified from the original test to improve friction sensitivity especially within the range of friction factors commonly observed in metal forming. Geometric deviation of the die was simulated using Deform-2D to establish the acceptable tolerance for the fabrication. The effect of variation in workpiece mechanical properties on the test behavior was also investigated through Deform-2D simulation. Based on simulations on a 1 mm diameter copper workpiece, a tolerance of 0.01 mm (1% of workpiece diameter) was found to be the most suitable for the die fabrication. In addition, it was shown that variations in workpiece mechanical properties of up to 10% do not significantly influence the friction test results. Ultimately, T-Shape test experiment was conducted using copper workpieces to examine how the test complied with the friction behavior observed in the experiment.

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Improving the Sensitivity of T-Shape Test to Friction Conditions for the Evaluation of Friction Behaviour in Microforming

Cited by 2 publications

References 4 publications

Depth-dependent stress–strain relation for friction prediction

Depth-dependent stress–strain relation for friction prediction

The influence of die geometry and workpiece mechanical properties in T-Shape friction test

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