Effects of Work-Hardening Exponent and Strain-Rate Hardening Exponent on the Determination of Friction Factor

가공경화지수 및 변형율속도 경화지수의 변화가 마찰상수 결정에 미치는 영향

The ring compression test has been widely employed as an experimental means to determine the friction factor. The calibration curves are obtained by the rigid-plastic finite element analysis for various work-hardening exponent and strain-rate hardening exponent. The effects of work-hardening exponent and strain-rate hardening exponent are thoroughly studied and discussed from the finite element computation. The change of friction factor during height reduction in ring compression is also discussed. Then, the method to estimate the change of friction factor during ring compression is proposed.