Ma, Chien-ChingChien-ChingMaMarch , A.A.MarchFreund, L. B.L. B.FreundDuffy, J.J.DuffyCHIEN-CHING MA2018-09-102018-09-101986http://ntur.lib.ntu.edu.tw/handle/246246/122871http://scholars.lib.ntu.edu.tw/handle/123456789/322380Use of the Shadow Spot Method in Evaluating J for Ductile Steelsconference paper