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| ON THE VOID GROWTH OF C-Mn STRUCTURAL STEEL DURING PLASTIC DEFORMATION——Ductile Fracture Mechanisms in a Structural Steel (Ⅱ) |
| SHI Yaowu (Xi'an Jiaotong University); BARNBY J. T. (University of Aston; Birmingham; U.K.) (Manuscript received 21 March; 1983) |
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Cite this article:
SHI Yaowu (Xi'an Jiaotong University); BARNBY J. T. (University of Aston; Birmingham; U.K.) (Manuscript received 21 March; 1983). ON THE VOID GROWTH OF C-Mn STRUCTURAL STEEL DURING PLASTIC DEFORMATION——Ductile Fracture Mechanisms in a Structural Steel (Ⅱ). Acta Metall Sin, 1984, 20(1): 24-33.
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Abstract A procedure was proposed to establish a void growth relation with the plastic strain and stress triaxiality during the ductile fracture of a C-Mn structural steel. A multiplying factor on void growth was determined using smooth tensile specimen tests and pre-cracked side-grooved three-point bend bar tests. The factor was expected to be available to a rather wide range of the constraint. Based on the experimental void growth relation, the real void growth rate in the structural steel is slower than that determined by the Rice-Tracey's void growth theory, when the stress triaxiality, σ_m/(?), is larger than about 1.2. However, when the σ_m/(?) value is smaller than about 1.2, the void growth predicted by the Rice-Tracy's theory trends to sightly underestimate the void growth in the steel. Moreover, the variations of the plastic strain, relative void volume and stress triaxiality were measured and evaluated ahead of the blunting crack tip in the pre-crackcd side-grooved three-point bend specimens, when the ductile tearing initiated.
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Received: 18 January 1984
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