关键词: 序列图像;重构方法;纳米复合陶瓷材料;统一强度理论;抗弯强度

Abstract: To consider the influence of material’s microstructure on macro-bending strength of Al2O3/(W,Ti)C ceramic composite, a method for automatically reconstruct FE mesh models of materials is developed based on X-ray tomography image, and a calculation program considering the material’s strain-hardening for strength prediction is complied by using unified strength theory(UST). Then the upper and lower limit of the bending strength of Al2O3/(W,Ti)C ceramic composite is forecasted based on the rigid-plastic assumption with UST. The predicted strength is proved to be accurate compared with the experimental result when the parameter b, in UST, is chosen to be 0.5. Utilizing linear-hardening elastic-plastic constitutive model based on UST, the relationship between hardening effect of reinforcing phase and macro-bending strength of Al2O3/(W,Ti)C ceramic composite is studied. Considering different volume fraction of compositions in Al2O3/(W,Ti)C, bending strength of Al2O3/(W,Ti)C ceramic nano-composite is forecast, which can be used for reference of research and development of Al2O3/(W,Ti)C ceramic composite.

Key words: sequence image;reconstruction method;ceramic nanocomposite;unified strength theory;bending strength