为研究多轴应力下铁素体球铁延性断裂机制,采用三种不同曲率半径(ρ=2,4,10mm)的缺口圆柱试样进行拉伸试验,并用大弹塑性变形有限元分析法计算试样缺口部位的应力、应变分布。在中断拉伸试样上进行金相观察,跟踪石墨球与基体界面处微空洞的形核和长大。研究结果表明,当石墨球与基体界面处的应力到达650MPa时,微空洞形核,空洞长大和聚合导致延性断裂。
An investigation was made of the ductile fracture of ferrite nodular graphite cast iron under multiaxial tensile stress using the notched cylindrical specimens with 3 different notch root radii 2, 4 and 10mm. Numerical stress and strain distributed at notch were calculated by means of the finite element method taking into account of large elastic-plastic deformation. The nucleation and growth of cavities among the interface of graphite nodule and matrix were traced under metallographic observation on interrupted tensile testing. Experimental results showed that the ductile fracture of specimen may be caused by the nucleation, gro wth and then coalescence of cavities when the stress on the interface of graphite nodule and matrix raised up to about 650 MPa.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | |
| [11] | |
| [12] |
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