Figure 41. Residual stresses in a solvent-bonded 15-inch-diameter capsule not 



removed by annealing operation; maximum shear stress approximately 

 1,300 psi. 



The advantages of this bonding technique are: ( 1 ) the dimensional 

 tolerances of spherical pentagons being bonded need not be tight because 

 reasonable dimensional deviations are taken care of by the 0.100-to-0.150- 

 inch-wide joint space, (2) there is no requirement for clamping forces on the 

 members being bonded, (3) irregularly shaped surfaces can be joined, providing 

 the joint space can be sealed on both sides with adhesive tape, (4) there is no 

 requirement for fine finish on the acrylic plastic surfaces forming the two 

 sides of the joint, and (5) the bonding of a large structure can proceed by 

 small increments with each joint increment becoming set before the next 

 pouring is performed. 



68 



