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| CRACK-TIP FRACTURE STRESS UNDER GENERAL YIELDING OF LIGAMENT |
| by Deng Zhisheng and Wang Degen (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry) |
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Cite this article:
by Deng Zhisheng and Wang Degen (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry). CRACK-TIP FRACTURE STRESS UNDER GENERAL YIELDING OF LIGAMENT. Acta Metall Sin, 1981, 17(5): 558-564.
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Abstract The criterion of maximum shear stress for crack extension, namely, the critical fracture stress at the crack tip,(σ_(yy))_c=σ_F was verified to be applicable to the ductile fracture in the range between—100℃ up to room temperature.Considering the independence of this criterion and the critical fracture stress at crack tip upon temperature, the observed phenomena of which J_c decreases with decreasing temperature may be qualitatively explained. The specimen geometry and the curvature radii of notch root are not affected with the average fracture strength, but affected with the true fracture strain. Thereby, the fracture strength is probably an important descriptive parameter of mechanical properties of materials.
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Received: 18 May 1981
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[1] 邓枝生、陈篪,金属学报,14(1978) ,239．
[2] 陈篪,金属学报,13(1977) ,57．
[3] 冶金部钢铁研究院断裂韧性组,未发表资料,1976．
[4] 陈篪等,工程断裂力学(上册),国防工业出版社,1977,p.405．
[5] 陈篪等,金属断裂研究文集,冶金工业出版社,1978,p.53．
[6] Knott, J. F., Fundamentals of Fracture Mechanics, Butterworths, London, 1973． |
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