Modelling of heating and rise of thermal tensions in metall-intermetallied-metall structure

   

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Mathematical Models and Computing Experiment in Material Science - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2008, #10
http://www.materials.kiev.ua/article/216

Abstract

Heating and rise of thermal tensions in the 5 mm thick plate of the layered composite at conditions characteristic for the walls of combustion chambers of ramjets has been modeled. The compo appears by alternation of layers Cr-NbCr2-Nb. The thickness of metallic layers was varied (2,5 – 0,5 mm), while the layers of the intermetallide had remained constant thickness of 10 ?k. It was showed that, not dependency upon the thickness of layers of compo, time of achievement of stationary distribution of temperatures on the plate section is about 100 seconds. The overfall of temperatures throw the plat in the stationary mode achieves 10 % at achievement of stationary distribution of temperatures. Heating of plate at the beginning brings in additional compression tensions in the region near of the hot surface. Maximal tensions arise up in the first 0.2 seconds and are sharp increase of compression tensions. Thus, note should be taken on the dynamics of compression tensions changes in a region near of the hot surface. The first moments of heating are the most dangerous