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...................... ................ ..... ....... 33

3-1 Material properties of glass/epoxy and carbon/epoxy laminates ...........................36

3-2 Singularity results of E-glass/epoxy................... ..... ........................ 38

3-3 Singularity results of graphite/epoxy. ............. ......................... .....................38

3-4 Dimensions of specimens and various mid-ply thickness .....................................42

3-5 Fracture load and fracture toughness at room and cryogenic temperatures ............42

4-1 Molecular diameter of various gases from CRC Handbook of Chemistry and
 Physics, 54th Edition......... .................. .. ................ ...... ........... 55

4-2 D description of com posite specim ens ............................................. ............... 56

4-3 Permeability of laminated composites for various number of cryogenic cycles......61

4-4 Permeability of textile composites for various number of cryogenic cycles. ..........62

4-5 Permeability of laminated composites embedded with nano-particles for
 various number of cryogenic cycles .............................................. .................. 62