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| SPIRAL FRACTURE IN POLYCRYSTALLINE COPPER |
| CHEN SHEN-BAO;LIU SHU-I Peking Institute of Iron and Steel Institute of Metallurgy and Ceramics; Academia Sinica |
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Cite this article:
CHEN SHEN-BAO;LIU SHU-I Peking Institute of Iron and Steel Institute of Metallurgy and Ceramics; Academia Sinica. SPIRAL FRACTURE IN POLYCRYSTALLINE COPPER. Acta Metall Sin, 1957, 2(2): 179-184.
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Abstract Industrially pure copper was subjected to ordinary tensile test. Some extraor-dinary type of fracture was found. Several specimens show the same results thatthe fracture can not he classified as "cup and cone" but appears as spirals asshown in Fig 6 and 8 in the chinese text. The fracture starts at center of thespecimen with a small irregular contour having scattered local cones, and thenseems to propagate by tearing off a wedge-shape-sectioned volume of materialalong a plane spiral until the surface is reached. The angle of the wedge neverappears anywhere close to π/2, this implied that the two wedge surfaces are notthe maximum principle shearing planes, therefore this type of fracture can notbe interpreted on the basis of the maximum shear stress criterion.
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Received: 18 February 1957
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[1] Ludwik, P. Z. Matallkde, 18 (1926) , 269．
[2] C. W. MacGregor, Relations betwen Stress and Reduction in Area in Tensile Tests of Metals, A. I. M. E. Tech, Rub. 805, New, York Meeting, 1937． 或Nadai; Theory of Flow and Fracture of Solids, 1950, p 81．
[3] J. Miklowits, 同[2] 书, p. 82．
[4] O. Hoffman & G. Sachs, Introduction to the Theory of Plasticity for Engineers, 1953, Chap. 14, sec. 2．
[5] E. R. Parker, H. E. Davis, A. E. Flanigan 同[2] 书, p. 185．
[6] C. F. Tipper, The fracture of Metals, Metallurgia, Vol. 39, p. 133, 1949．
[7] Orowan, Fracture and Strength of Solids, 1949．
[8] Liu Shu-I (刘叔仪), J. J. Lynch, E. J. Ripling and G. Sachs, Low Cycle Patigue of Aluminum Alloy, 24-st in Direct Stress, A. I. M. E., Metals Technology, 1948, T. P. No. 2338．
[9] Nadai, 同[2] 书, p. 183．
[10] H. E. Davis, 同[2] 书, p. 84． |
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