抗裂圆环的干缩应力分析 Ⅲ.均匀干燥时钢芯壁厚的影响及抗裂性能判据

Shrinkage Stress Analyses on Breaking Ring——Ⅲ.Effects on Thickness of Steel Core and Criterion of Anti-cracking Performance During Homogeneously Drying Process

在弹性力学基本方程的基础上,研究了均匀干燥时钢芯壁厚对径向位移分布、径向应变分布、环向应变分布、径向应力分布和环向应力分布的影响规律。通过比较试验状态与实际工程状态的差异,提出了绝对约束状态的概念。用弹性力学方法推导出绝对约束状态下应力的计算公式,并以此提出了水泥基材料抗裂性能的定量判据。

On the basis of the equations of elasticity, the influences of the thickness of steel core on the distribution of the radial displacement, radial strain, circumferential strain, radial stress and circumferential stress under the condition of homogeneously drying are studied. By the comparison between the test state and the engineering state, the concept of absolute restraint is advanced. The equation calculated the stress under the condition of absolute restraint is derived by the method of elasticity. And the quantitative criterion of crack resistance is put forward.