Thermoelastic Effects in the Solidification of Castings

这项研究将探讨一些重要的 铸件凝固过程中的热弹性效应。的 铸件的质量主要取决于热边界 在铸件和模具之间的界面处的条件。 这些很大程度上取决于那里的接触电阻， 这又取决于局部接触压力。这 压力受局部热变形的影响， 凝固的铸件，从而导致耦合的热和 机械问题。经验表明，这种耦合可以导致 不稳定性导致名义上的轮廓误差 平面铸件表面。不稳定性的波长 最适合在这种条件下生长。更现实的 本构关系和模具的热变形将是 研究了类似的调查将在 圆柱体和球体形式的轴对称铸件 * //

The research proposed will investigate some important thermoelastic effects in the solidification of castings. The quality of a casting depends critically on the thermal boundary conditions at the interface between the casting and the mold. These are largely governed by the contact resistance there, which, in turn, depends on the local contact pressure. This pressure is affected by the thermal distortion of the partially solidified casting, thereby leading to a coupled thermal and mechanical problem. Experience shows that this coupling can led to an instability which results in profile errors in a nominally plane cast surface. The wavelength of the instability which is most favored to grow under such conditions. The of more realistic constitutive laws and of thermal deformations of the mold will be studied. A similar investigation will be carried out for axisymmetric castings in the form of cylinders and spheres.*** //