本支以工业纯铜为材料作断口观察,发现其在断裂后,断口呈旋纹形。这种形状的金属断口在文献中未曾提及。本文试验了影响此种断口形成的因素、退火温度等。此种旋纹断口的研究可能对研究裂口传播等工作有一定帮助。
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.
参考文献
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