SERVICES TO GENERATE BASIC ENGINEERING DATA ON THE BEHAVIOR OF PLASTIC COMPOSITE STRUCTURES UNDER VARIOUS CONDITIONS OF STRESS
BENDIX CORP SOUTH BEND IND BENDIX PRODUCTS DIV
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Test methods and results of D-ring tests on prepreg tapes made from yarn and pre-preg 20-end rovings are summarized. The test fixture is the NOL-type split ring test. The test procedure consists of wrapping a pre-preg tape around the outer periphery of a short cylinder divided into 2 equal sections, each resembling the letter D.After winding, the ring assembly and tape are placed in a curing oven after curing the unit is placed in the tensile test machine. During the test the ring is subjected to both tension and bending. Determination of per cent resin content of the specimen and cross sectional area of glass being tested is arrived at by a burn-off test.