论文部分内容阅读
一、前言随着宇航工业的发展及超高功率炼钢技术的开发,对石墨材料的抗热震能力提出了更苛刻的要求。W.D.Kingery把抗热震因子归纳为R=σ_t(1-μ)/E·α。当材料处于非稳态热流时,引入热导系数,方程可改写为R=σ_t·κ/E·α,其中,σ_t为拉伸强度;E为弹性模量;α为热膨胀系数;κ为热导系数;μ为泊松比。后来有人把上述公式简化为R=ε/α,ε为拉伸断裂应变,α仍为热膨胀系数。
I. Introduction With the development of the aerospace industry and the development of ultra-high-power steelmaking technology, more stringent requirements have been put forward on the thermal shock resistance of graphite materials. W. D. Kimgery summarized the thermal shock resistance factor as R = σ_t (1-μ) / E · α. When the material is in unsteady heat flow, the thermal conductivity is introduced and the equation can be rewritten as R = σ_t · κ / E · α, where σ_t is the tensile strength; E is the modulus of elasticity; α is the thermal expansion coefficient; κ is the thermal Conductance coefficient; μ is Poisson’s ratio. Later, some people simplify the above formula to R = ε / α, ε is the tensile strain at break, α is still the thermal expansion coefficient.