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Articles : Medicinal Chemistry ; Anticancer Constituents from the Roots of Rubia cordifolia L
( Jong Keun Son ),( Soon Ja Jung ),( Ji Hyun Jung ),( Zhe Fang ),( Chong Soon Lee ),( Chang Seob Seo ),( Dong Cheul Moon ),( Byung Sun Min ),( Mi Ryeo Kim ),( Mi Hee Woo ) 영남대학교 약품개발연구소 2008 영남대학교 약품개발연구소 연구업적집 Vol.18 No.-
Cyclic Deformation and Phase Transformation of 6Mo Superaustenitic Stainless Steel
( Shing Hoa Wang ),( Chia Chang Wu ),( Chih Yuan Chen ),( Jer Ren Yang ),( Po Kay Chiu ),( Ja Son Fang ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 METALS AND MATERIALS International Vol.13 No.4
A fatigue behavior analysis was performed on superaustenitic stainless steel UNS S31254 (Avesta Sheffield 254 SMO), which contains about 6 wt.% molybdenum, to examine the cyclic hardening/softening trend, hysteresis loops, the degree of hardening, and fatigue life during cyclic straining in the total strain amplitude range from 0.2 to 1.5 %. Independent of strain rate, hardening occurs first, followed by softening. The degree of hardening is dependent on the magnitude of strain amplitude. The cyclic stress-strain curve shows material softening. The lower slope of the degree of hardening versus the strain amplitude curve at a high strain rate is attributed to the fast development of dislocation structures and quick saturation. The ε martensite formation, either in band or sheath form, depending on the strain rate, leads to secondary hardening at the high strain amplitude of 1.5 %.