Table 2-13. Maximum and minimum principal stresses in the fiber and matrix phases in the inner and outer face-sheets of the sandwich composite without internal pressure. Without tank pressure at T= 50K Layer Inter Facesheet Outer Facesheet Fiber (MPa) Coi 58.8 57.8 59.6 60.6 59.6 57.8 58.8 59.1 61.1 58.2 58.1 58.2 61.1 59.1 Matrix (MPa) C7i 70.9 69.3 71.0 71.3 71.0 69.3 70.9 C02 -138 -107 -157 -185 -156 -107 -139 -123 -175 -101 -97.5 -101 -175 -123 71.3 71.7 70.4 70.3 70.4 71.7 71.4 02 -2.71 -2.47 -2.49 -2.73 -2.50 -2.50 -2.74 -3.79 -3.74 -3.99 -3.87 -4.00 -3.75 -3.82 Table 2-14. Maximum and minimum principal stresses in the fiber and matrix phases in the inner and outer face-sheets of the sandwich composite subjected to a pressure of 10 KPa. Tank pressure Fiber (MPa) Layer Inter Facesheet Core Outer Facesheet 45 90 -45 0 -45 90 45 -65 90 -65 Col 77.8 121 92.5 79.0 90.8 121 77.5 84.8 80.8 74.7 100 74.7 80.8 85.5 10KPa at T= 50K Matrix (MPa) C02 -167 -33.5 -37.1 -162 -38.1 -33.7 -166 -78.0 -242 -76.8 -45.7 -77.3 -244 -77.7 Col 101 93.2 96.4 90.0 96.4 92.9 101 93.1 99.3 96.9 96.2 97.0 99.5 93.0 45 90 -45 0 -45 90 45 Core -65 90 -65 02 -21.2 -27.2 -23.0 -14.1 -22.8 -27.1 -21.4 -27.5 -16.2 -19.0 -25.2 -19.0 -16.3 -27.6