Effect of loading rates of severely thermal-shocked glass fiber/epoxy composites,
Kishore K. Mahato, Dinesh K. Rathore, Krishna Dutta, Bankim Chandra Ray, Department of Metallurgical and Materials Engineering.
resent investigation is aimed to study the effect of short term exposure of thermal-shock
conditioning on the mechanical properties of glass/epoxy (GE) composites.
The specimens were conditioned at –60 °C temperature for 36 h followed by further conditioning at +70 °C
temperature for the same duration. In order to assess the effect of thermal-shock on the mechanical properties,
tensile tests of the conditioned and unconditioned specimens were done with various loading rates viz. 1, 10, 100, 500
and 1000 mm/min. The ultimate tensile strength (UTS) as well as strain to failure were found to increase with increase
in the loading rates at room temperature; the thermal-shocked conditioned specimens exhibited even higher UTS and failure
strain as compared to the unconditioned specimens. It can be stated that different coefficients of thermal expansion during
thermal-shock conditioning and significant amount of pre-existing residual stresses govern the stress distribution and ultimately
the mechanical properties of glass/epoxy composite. Various dominating modes of failures in the composites were analyzed under scanning
(More in Composite Communications, Vol 3, 2017, pp7-10
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