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为了能在铸钢件的应力场及热裂的计算机模拟模型中恰当地反应铸型与铸件的相互机械作用,本文对国内铸钢生产中常用的几种型砂高温力学性能进行了实验研究.文中采用SWX—Ⅱ型型砂高温强度仪测定了型砂在不同温度下的应力一应变曲线,求出型砂在不同温度下的形变模量E、抗压强度бp以及型砂软化后的粘度底数(?).并依据散体力学中的Mohr—Columb破坏理论,对型砂的摩擦角φ中和粘聚力C进行了测算.
In order to properly reflect the mechanical interaction between the mold and the casting in the stress field and the thermal cracked computer simulation model of castings, this paper conducts an experimental study on the high temperature mechanical properties of several kinds of sand commonly used in the domestic steel production. The stress-strain curve of molding sand at different temperatures was measured by SWX-Ⅱ type sand high temperature strength tester, and the modulus of deformation E, compressive strength бp and the viscosity base (?) Of the molding sand softened at different temperatures were obtained. Based on Mohr-Columb failure theory in bulk mechanics, the frictional angle φ and cohesion C of sand were calculated.