Size-Effects in Micro-Metal Sheet Forming of Unalloyed Copper and Brass

Tsai, Ming-Chin; Chen, Y.A.; Wu, Chung‐li; Chen, Fuh Kuo

doi:10.4028/www.scientific.net/amr.6-8.705

Cited by 10 publications

(4 citation statements)

References 4 publications

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“…Tensile, bending and upsetting tests have been carried out to investigate the size effect on aluminium, copper and brass material. 12,16 It was found that flow stress decreases with scaling down of the size of the material.…”

Section: Introductionmentioning

confidence: 99%

Investigations of size effect on formability and microstructure evolution in SS304 thin foils

Sahu

Chakrabarty

Raghavan

et al. 2018

The Journal of Strain Analysis for Engineering Design

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In the micro-forming process when the thickness of the sheet material is comparable to the intrinsic length scales of that material, deformation behaviour differs from that which is expected in the macroscopic sheet material. In this study, size effects of SS304 foils have been investigated using tensile and limiting dome height tests along with careful microstructural investigations. SS304 foils of differing thicknesses but similar grain size have been deformed under varying strain path conditions to capture the impact of foil thickness on the mechanical response and microstructure evolution. Formability curves for SS304 foils constructed from limiting dome height tests show that limit strains increase with increasing foil thickness. Microstructure investigations highlight the importance of grain misorientation, twin fraction and texture on the formability of SS304 foils.

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Section: Introductionmentioning

confidence: 99%

Investigations of size effect on formability and microstructure evolution in SS304 thin foils

Sahu

Chakrabarty

Raghavan

et al. 2018

The Journal of Strain Analysis for Engineering Design

View full text Add to dashboard Cite

show abstract

“…Tsai et al [6] used two kinds of copper alloy C12000 and C26000 for micro forging and micro tensile test respectively in 2005, and compared the difference in size effect between these two testing processes. The experiment results show that C26000 has better matrix strength and grain strength.…”

Section: Introductionmentioning

confidence: 99%

Grain Size Effect on Saddle Phenomenon in V-Bending Process of Thin Sheet Metal

Chen

Hong

2018

KEM

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The ability for predicting the springback on sheet metal bending processes is identified as an important feature of the ability for predicting the final geometry of sheet metal parts. The grain size effect makes the difficult on application of traditional design method in processing. As through tool and processing design, to understand the effects of grain size effects is an important and powerful way to effectively compensate for and eliminate the springback. In this paper, 99.5% pure iron specimens were annealed at different temperature to obtain the specified grain sizes. The effects of different grain sizes on the saddle after V-bending of the thin sheet metal were investigated. The results show that at the same thickness of specimens, the grain size has no significant effect on the saddle height. However, with increasing the thickness of the specimens the saddle will also be more prominent protruding height. The concave side of bent specimen is against the compression force and its grains structure tend to a round shape, whereas the convex side is against the tensile force and its grains structure tend to a flaky shape.

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“…Therefore, comprehensive tests and investigations of various materials in the micro scale region are required to obtain the basic and fundamental knowledge of size effect for micro forming. Tsai et al [4] conducted tensile and upsetting tests on C12000 copper and C26000 brass to understand the size effects. Miyazaki [5] selected different materials to investigate the size effect on the flow stress curve with various grain sizes and specimen thicknesses.…”

Section: Introductionmentioning

confidence: 99%

Size Effect on Micro Tensile Test of Copper

Huang

Chang

2011

AMR

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There has been a significant research interest in metal micro-forming for the last ten years. However, neither a methodology nor an exact micro mechanical property has been well determined. Hence, several experiments are carried out in this research to point out the influence of “size effect”. Based on the comparison between the experimental data and relevant parameters, the material characteristics in micro scale can be found. In order to find the mechanical properties in micro scale, this study shows the effect of specimen size and grain size on the micro tensile test of copper material. Firstly, five copper micro-sheets with different thicknesses have been chosen as experimental materials. Since the minimum standard test piece formulated in ASTM is still too big for this micro tensile test, this study decided to shrink the sample size of specimen shape to 1/2 . Then the flow stress decreases with decreasing specimen size. This way is able to get the important factor which influence the flow stress on the micro tensile test. Secondly, these samples of different grain sizes are made by heat treatment. Then these samples of different grain sizes are used to conduct the experiment. According to the experimental result, the change of flow stress, which is influenced by various grain sizes, can be found. Finally, the change in the mechanical behavior between specimen size and grain size is obtained.

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Size-Effects in Micro-Metal Sheet Forming of Unalloyed Copper and Brass

Cited by 10 publications

References 4 publications

Investigations of size effect on formability and microstructure evolution in SS304 thin foils

Investigations of size effect on formability and microstructure evolution in SS304 thin foils

Grain Size Effect on Saddle Phenomenon in V-Bending Process of Thin Sheet Metal

Size Effect on Micro Tensile Test of Copper

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