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THERMAL DEGRADATION EFFECT ON THE FRACTURE TOUGHNESS OF GLASS FIBER REINFORCED UNSATURATED POLYESTER RESIN COMPOSITE | ||
| Iraqi journal of mechanical and material engineering | ||
| Article 1, Volume 11, Issue 4, 2011, Pages 709-719 | ||
| Author | ||
| Akram R. Jabur | ||
| Abstract | ||
| Abstract Samples of FRP prepared by applied unsaturated polyester resin as matrix reinforced by one layer woven glass fiber( 0º/90º), using hand lay up method. The prepared samples are subjected to thermal aging at 85 º C for different time in dryer oven up to 1200 hrs time and tested by unnotched sample impact tester to obtained the fracture toughness , polynomial relationshape of order 5 found between Gc and Aging time decreasing Gc strongly to lower value .The Stress strain tests for aged to specific time and without aging samples by tensile test show that sample aged thermally tend to brittle behavior and lost its mechanical properties as aging time increase, while sample without aging show ductile behavior . FTIR analysis show decomposition of the polyester by creating new free radical and observed new peak wave number in transmtion spectra due to fiber crystallization. | ||
| Keywords | ||
| thermal degradation; aging; composite; Fracture toughness; Polyester; impact | ||
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