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"DETERMINATION OF DAMAGE TOLERANCE OF COMPOSITE LAMINATE SUBJECTED TO STRESS-CORROSIVE ENVIRONMENT ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 1, page no.739-746, January-2021, Available :http://www.jetir.org/papers/JETIR2101099.pdf

• Vijaya Kumar R
• G.L Chandrasekhar

Abstract— Composite materials are widely used in aerospace and other fields, mainly due to their light weight, high strength to weight ratio, chemical resistance and high fatigue life. Polymer matrix composites find extensive applications in aerospace industries. Currently fiber reinforced polymer matrix composites constitute more than 90% of the total composite used in aerospace industry. This research presents the recent trends in the mechanical characterization of composite systems exposed to sea water environments. This work provides an insight on very long-term degradation of epoxy and polyester-fiber glass composites immersed more than 720 hours in saline medium under service stresses. Samples were loaded under bending conditions with stresses both in the elastic and plastic fields, the result that characteristics in a flexural mode were able to be determined and the ensuing decrease in characteristics was fitted to an exponential model. The degree of losses ranged from 28% to 35% for the flexural strength. The most notable losses were for specimens immersed in natural sea water under a continuous stress of some load, corresponding to the plastic behavior of the material. First, a testing protocol for environmental effects has been developed for resin infused in-house fabricated laminates. Unidirectional ([0] and [90]) mechanical test samples were submerged in synthetic sea water at 24°C and 25°C, with the weight recorded at time intervals over the entire period. The fatigue resistance of environmentally conditioned samples is reduced at high stress levels, but matches the un-conditioned samples at low stress levels. The Flexular strength after period of time has been decreased whereas the water absorption has increased slightly.

Polyester, Sea water, Mechanical, Flexural Strength

"DETERMINATION OF DAMAGE TOLERANCE OF COMPOSITE LAMINATE SUBJECTED TO STRESS-CORROSIVE ENVIRONMENT ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 1, page no. pp739-746, January-2021, Available at : http://www.jetir.org/papers/JETIR2101099.pdf