2- Given the strain behavior of a hypothetical ceramic and a metal bar below with respect to. temperature: 10x 10 AL/Lo 5x10 2x10 1x10 520 Ceramic 750 Temp. C 1000 520 Metal 750 Temp. C 1000 a) Draw the corresponding thermal expansion coeff. change below the graphs (10 P) b) The metal surface at 520 C is covered by spraying ceramic and left to cool to 20 C at normal conditions. For Ec= 15x1010 Pa, Em = 25x1010 Pa, calculate the magnitude and show the nature of internal stresses which will form at the interface. (10P) (Calculate first the thermal expansion coefficients)