APPENDIX A 



TEST PROGRAM FIBERGLASS POLYESTER LAMINATES 



TEST PROCEDURES 



The following test procedures are modifications of existing procedures or were especially 

 devised for this test program, by the participating laboratories: 



Shear Strength - Parallel 



The test for shear strength parallel to the laminate was modified from 

 ASTM-D-732 or LP-406-b method 1041. 



Strips of the laminate under test were cut to the same width as the laminate's 

 thickness. The samples were then tested in the Johnson Double Shear Jig with 

 the side edge of the laminate up at a position rotated 90 degrees from the test 

 position used for perpendicular shear. 



Poisson's Ratio in Compression 



The longitudinal and lateral deformation of the compression samples were 

 followed simultaneously by SR4-X extensometers developed by Plastics Research 

 Laboratory, Massachusetts Institute of Technology. The simultaneous data was 

 plotted automatically on an X-Y recorder. 



Poisson's Ratio in Tension 



The longitudinal deformation of the tensile specimen is recorded by a micro- 

 former type extensometer and automatically plotted on a load deflection recorder. 



The lateral deformation was followed by an SR-4 extensometer provided by 

 Plastics Research Laboratory, Massachusetts Institute of Technology with the 

 data plotted automatically on a separate load deflection recorder. 



Calculation of Compressive and Tensile Poisson's Ratios 



The data for lateral deformation was plotted versus the simultaneous longitudinal 

 deformation on rectilinear graph paper. The slope of the plotted graph is equal 

 to Poisson's Ratio. 



A-l 



