| ROUGHNESS-INDUCED SHEAR RESISTANCE OF MODE Ⅱ CRACK GROWTH |
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| 作者姓名： | ZHENG Yesha WANG Zhongguang AI Suhua State Key Laboratory of Fatigue and Fracture for Materials Institute of Metal Research Academia Sinica Shenyang China postdoctor Shanghai Institute of Ceramics Academia Sinica Shanghai China |
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| 作者单位： | ZHENG Yesha WANG Zhongguang AI Suhua State Key Laboratory of Fatigue and Fracture for Materials，Institute of Metal Research，Academia Sinica，Shenyang，China postdoctor，Shanghai Institute of Ceramics，Academia Sinica，Shanghai 200050，China |
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| 摘 要： | It is obtained in this paper that the fatigue threshold value of mode H was 1.9 times of that ofmode Ⅰ in dual-phase steel(DPS),and the normal stress intensity factor range oJ mode Ⅱbranch crack tip was 2.2 times of that of mode Ⅰ.Above results illustrate that the resistance ofmode Ⅱ crack growth was higher than that of mode Ⅰ,the former resulting fromroughness-induced shear resistance,the latter,crack closure.The mode Ⅱ component can play two important roles in near-threshold fatigue crackgrowth:(1)increasing crack tip plasticity which accelerates the crack growth and(2)intro-ducing crack surface contact and rubbing to reduce the crack propagation rate.By means ofcrack closure,the quantity of shear resistance was easily solved in this paper.The frictionshear stress strength factor range of mode Ⅱ,K_,is still much higher than the closure stressstrength factor range of mode Ⅰ,K_(Ⅰ,cl).This illustrated that the roughness enlarged the secondrole and played a role of shielding crack tip from mode Ⅱ crack.
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| 关 键 词： | mixed-mode(Ⅰ/Ⅱ)fatigue crack growth threshold crack closure toughness shear resistance steel 16 Mn |
| 收稿时间： | 1993-12-25 |
| 修稿时间： | 1993-12-25 |
ROUGHNESS-INDUCED SHEAR RESISTANCE OF MODE Ⅱ CRACK GROWTH |
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| ZHENG Yesha WANG Zhongguang AI Suhua State Key Laboratory of Fatigue and Fracture for Materials,Institute of Metal Research,Academia Sinica,Shenyang,China postdoctor,Shanghai Institute of Ceramics,Academia Sinica,Shanghai ,China.ROUGHNESS-INDUCED SHEAR RESISTANCE OF MODE Ⅱ CRACK GROWTH[J].Acta Metallurgica Sinica(English Letters),1993,6(6):397-404. |
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| Authors: | ZHENG Yesha WANG Zhongguang AI Suhua State Key Laboratory of Fatigue and Fracture for Materials |
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| Affiliation: | ZHENG Yesha WANG Zhongguang AI Suhua State Key Laboratory of Fatigue and Fracture for Materials,Institute of Metal Research,Academia Sinica,Shenyang,China postdoctor,Shanghai Institute of Ceramics,Academia Sinica,Shanghai,China |
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| Abstract: | It is obtained in this paper that the fatigue threshold value of mode H was 1.9 times of that of mode Ⅰ in dual-phase steel(DPS),and the normal stress intensity factor range oJ mode Ⅱ branch crack tip was 2.2 times of that of mode Ⅰ.Above results illustrate that the resistance of mode Ⅱ crack growth was higher than that of mode Ⅰ,the former resulting from roughness-induced shear resistance,the latter,crack closure. The mode Ⅱ component can play two important roles in near-threshold fatigue crack growth:(1)increasing crack tip plasticity which accelerates the crack growth and(2)intro- ducing crack surface contact and rubbing to reduce the crack propagation rate.By means of crack closure,the quantity of shear resistance was easily solved in this paper.The friction shear stress strength factor range of mode Ⅱ,K_,is still much higher than the closure stress strength factor range of mode Ⅰ,K_(Ⅰ,cl).This illustrated that the roughness enlarged the second role and played a role of shielding crack tip from mode Ⅱ crack. |
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| Keywords: | mixed-mode(Ⅰ/Ⅱ)fatigue crack growth threshold crack closure toughness shear resistance steel 16 Mn |
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