Strain-based Fatigue Test of Woven Glass-Epoxy Fabric Composites

Abstract

Strain based fatigue testing of Glass-Epoxy Composite Material in Tension-Tension loading is carried out by using positive load method to evaluate potential crack propagation, fiber fractures, de-laminations, etc. Through continuous stressing in the material, evaluation of life cycle capabilities of glass fiber composites are found which is essential for Research Development, Structural Design, Quality assurance, Modeling and finally Material Specifications. By using an epoxy resin with glass fiber prepared in the form of mandrel of diameters 140 mm and the winding angle of 15° and 90° were winded in four layers i.e. 15°, 90°, 15°, 90° and after that, the process of hardening is completed. The Test Sample is cut into 20 pieces each of width 50 mm and the overall thickness of glass fiber composite became 3.3 mm. The Specimen is fixed in 809 MTS Axial/Torsional Test Machine with constant frequency 1 Hz and the test result is recorded in the Computer connected to the Machine. From the fatigue testing, it is observed that final reading at the time of fracture i.e. in terms of running time, axial force, axial displacement, and axial integral count cycle was recorded as 72801.390625 Sec, 0.121522857666016 kN, 4.7763674519961 mm and 72737.50 Cycles. Minimum and Maximum Strain Measurement corresponding to 0001 Cycle were -0.00045313 and 0.0075, at 30000 Cycle -0.00050313 and 0.00995, at 50000 Cycle -0.00075 and 0.0115, at 70000 Cycle (Final Cycle for fracture) was -0.010234375 and 0.515625.