Refractory stress-strain curves

Figure 4 Stress-strain curves of two hypothetical refractory materials.

Examples of compressive and flexural stress-strain curves for a 60% alumina refractory measured at various temperatures are shown in Figures 11 and 12. 

The above example is used to define the two load types in refractory fining systems. Since refractory finings are primarily exposed to thermal expansion loads, it is important to have accurate static compressive stress/strain (SCSS) data in order to determine the MOE data. It will be shown in later discussions on the SCSS data that most refractory materials become softer (lower MOE) at higher temperatures and also become more plastic at higher temperatures. SCSS data curves obtained from laboratory testing are used to define the MOE property as well as the plastic behavior of the refractory material in question. 

Let us assume there are two candidate refractory materials. Refractory A and Refractory B, chosen for the lining project. We will also assume that both materials have the same thermal material properties, meaning that both refractories have the same temperature profiles. For the mechanical material properties, we assume that both materials have the same coefficient of thermal expansion and Poisson s ratio. The only difference is in the static compressive stress-strain (SCSS) data. Figure 4 shows the hypothetical SCSS data curves for the two materials at an operating temperature Tq. Since both materials have the same temperature and the same coefficient of thermal expansion, both materials have the same thermal strain, The ultimate crushing stress for Refractory A is /ca... 

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