Specimen and Grain Size Effects of Al1100 on Strain and Strain Rate Hardening at Various Strain Rates for Al1100

Kwon, Junbeom; Huh, Hoon; Kim, J. S.

doi:10.1007/s11340-014-9870-6

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…To investigate the material properties of the micro - specimen at high strain rates, Kim and Huh [20] developed a high-speed micro - material testing machine (HSMMTM). Kwon et al [21] introduced a static micro - material testing machine (SMMTM) and the improved HSMMTM in consideration of accurate alignment between a specimen and the jig system and the gripping mechanism for convenient reliable testing. On the basis of the above material testing techniques, micro - material testing machines are newly developed by taking account of acquisition of the proper load and the gripping system for a target specimen of spot weld.…”

Section: Micro-materials Testing Apparatusmentioning

confidence: 99%

Material properties of the nugget zone in resistance spot-welded DP980 steel joint at various strain rates

Park

Kwon

et al. 2018

Science and Technology of Welding and Joining

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This paper suggests an approach to evaluate the material properties of the nugget zone in resistance spot-welded DP980 steel joints at various strain rates ranging from 0.001 to 100 s −1 . Two kinds of micro-specimens are prepared for the tests: one cut from the centre of the welded nugget zone; and the other cut at 1 mm away from the welded nugget centre. Test results show that the welded nugget zone has little discrepancy in the material properties depending on sampling location and that the flow stress of the nugget zone is relatively high compared with that of the base metal at each strain rate tested. It is confirmed from microscopic observation that the differences are mainly caused by the formation of coarse martensite phase in the welded nugget zone due to the rapid cooling after the resistance spot-welding process.

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Section: Micro-materials Testing Apparatusmentioning

confidence: 99%