A NEW ASSEMBLY AND EVALUATION OF DYNAMIC FRACTURE TOUGHNESS K_(1d) OF HIGH STRENGTH STEEL AT HIGH VELOCITY IMPACT
LI Qiang(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academyof Sciences; Shenyang 110015)LAI Zuhan(International Centre for Material Physics; The Chinese Academy of Sciences; Shenyang 110015)MA Changxiang(College of Sciences; Northeastern University; Shenyang 110006)Correspondent: LI Qiang; Tel: (024)23843531-55659; Fax: (024)3891320; E-mail: qli imr ac.cn
Cite this article:
LI Qiang(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academyof Sciences; Shenyang 110015)LAI Zuhan(International Centre for Material Physics; The Chinese Academy of Sciences; Shenyang 110015)MA Changxiang(College of Sciences; Northeastern University; Shenyang 110006)Correspondent: LI Qiang; Tel: (024)23843531-55659; Fax: (024)3891320; E-mail: qli imr ac.cn. A NEW ASSEMBLY AND EVALUATION OF DYNAMIC FRACTURE TOUGHNESS K_(1d) OF HIGH STRENGTH STEEL AT HIGH VELOCITY IMPACT. Acta Metall Sin, 1998, 34(8): 852-857.
Abstract A new assembly with a long impact bar for measuring the dynamic fracture toughness K1d under the condition of fast fracture is described in this paper. The basic principle and the method evaluating K1d under the condition of the fracture time tf being less than the oscillation period of the specimen (τ) are given which include not only the impact velocity but also the impact load. An example is presented for measuring K1d of high strength armour steel 30MnCrNiMoB quenched and tempered at 200 - 600℃. The results show that Kid increases with the loading time under high velocity impact, which are similar to those of 4340 AVR steel reported.
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