Thermoelastic Effects in the Solidification of Castings

铸件凝固中的热弹性效应

• 批准号: 9200762
• 负责人: James Barber
• 金额: $ 18万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-15 至 1996-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9200762&HistoricalAwards=false
• 关键词: Thermoelastic; Effects; Solidification; Castings

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.*** //

这项研究将探讨铸件凝固过程中一些重要的热弹性效应。铸件的质量在很大程度上取决于铸件与结晶器界面的热边界条件。这在很大程度上是由那里的接触电阻决定的，而接触电阻又取决于局部接触压力。这一压力受到部分凝固铸件的热变形的影响，从而导致热和机械耦合问题。经验表明，这种耦合可能会导致不稳定，从而导致名义上的平面铸造表面上的轮廓误差。在这样的条件下，最有利于增长的不稳定性波长。将研究更真实的本构关系和模具的热变形。将对圆柱体和球体形式的轴对称铸件进行类似的调查。