MS leading to PhD. Position

Research Topic: Non Destructive Testing of sandwiched composite material subjected to cyclic fatigue loading

A sandwich structured composite is a special class of composite materials that is fabricated by attaching two thin but stiff skins to a lightweight but thick core. The core material is normally low strength material, but its higher thickness provides the sandwich composite with high bending stiffness with overall low density.  Open and closed cell structured foams like polyvinylchloride, polyurethane, polyethylene or polystyrene foams, syntactic foams and honeycombs  are commonly used core materials. Open and closed cell metal foam can also be used as core materials. Laminates of glass or carbon fiber reinforced thermoplastics or mainly thermoset polymers (unsaturated polyesters, epoxies…) are widely used as skin materials. Sheet metal is also used as skin material in some cases. The core is bonded to the skins with an adhesive. The structure can be used for the fabrication of turbine blades, air craft industry and also a spacecraft radiator panels and in other thermal management applications. The C-C panels are priced competitively to current radiator panels.

Research work will comprise the following steps:

  1. Fabrication of composite structure having nomex honey comb core material sandwiched between two laminated face sheets of carbon epoxy by the process of liquid resin infusion.
  2. Mechanical testing of the composite structure for estimation of its ultimate tensile strength and compressive strength.
  3. Fatigue testing of the sample by subjecting it to different cyclic dynamic loading.
  4. Non destructive testing like RT, UT etc. of the sample for flaw detection in the sample after cyclic loading.
  5. Mechanical testing like Tensile, compressive or three point bend of the sample after cyclic dynamic loading.
  6. Estimating of the life expectancy of the sample after dynamic cyclic loading there by reduction in strength.

© 2014Center for Advanced Composites and Smart Structures.
Institute of Space Technology, Islamabad. All rights reserved.