彈性系數(shù)模型
(1. 中南大學 土木建筑學院力學系，長沙 410075；
2. 中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 在分析現(xiàn)有梯度硬度合金的組成分布函數(shù)和彈性系數(shù)模型的基礎上，結(jié)合梯度硬質(zhì)合金制備工藝，提出了以質(zhì)量分數(shù)為基本參數(shù)的新型梯度硬質(zhì)合金組分分布和彈性系數(shù)(包括彈性模量和泊松比)的分段函數(shù)模型，并通過YG類硬質(zhì)合金的實驗加以驗證。結(jié)果表明，新型分段函數(shù)模型預測的YG類硬質(zhì)合金彈性系數(shù)值與實測值吻合很好，并能較準確地預測YG6梯度硬質(zhì)合金彈性系數(shù)沿梯度方向的變化規(guī)律。
關鍵字: 梯度硬質(zhì)合金；組分分布函數(shù)；分段函數(shù)模型；彈性模量；泊松比
coefficient of gradient cemented carbide
（1. School of Civil and Architectural Engineering , Central South University, Changsha 410075, China;
2.State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract: Gradient cemented carbide is a new non-uniform composition material with high elastic modulus, good anti-corrosion and low deformation at high temperature. Because of the complex microstructure, the mechanical properties of gradient cemented carbide cannot be better described by currently-existing models of component distribution and elasticity coefficients. In this study, new multi-stage models of component distribution and elastic coefficients including elastic modulus and Poisson’s ratio are established based on analyses of the existing models and the fabrication technology, and verified by test results of YG cemented carbide. The results show that the new multi-stage models are of importance for the design and fabrication of gradient cemented carbide.
Key words: gradient cemented carbide; component distribution; multi-stage model; elastic modulus; Poisson’s ratio
