Write short notes. 1) Types of fiber. 2) Types of matrix.
[7 marks]Why are Composites used in Aerospace?
[3 marks]Define a composite material and give its classification in detail.
[4 marks]Derive Volume and Weight fraction for composite ?
[7 marks]What are the most widely used metal material for aircraft construction?
[3 marks]Discuss the various applications of composite materials.
[4 marks]Derive Longitudinal Strength and stiffness for composite ?
What is FRP? Write characteristics and advantages of FRPs.
[4 marks]Define: Fiber and Resins.
[3 marks]What are advantages of carbon fiber in Aerospace?
[4 marks]The E-glass fibers in polyester is 35% by weight. Given Density of fiber ῥf=2.50gm/ml and density of matrix ῥm=1 gm/ml Calculate fiber volume fraction Vf and density of composite ῥc for the lamina.
[7 marks]Define Lamina and laminate.
[3 marks]Describe the stress-strain relations for plane stress in an orthotropic material.
[7 marks]Discuss in detail symmetric laminates.
[4 marks]Define Isotropic and Anisotropic body.
[3 marks]What is Prepeg? Explain.
[4 marks]Identify of laminate. 1. [90|0] 2. [45|0|-45] 3. ['±30] 4. [0|90|0|90] 5. [60|02|60] 6. [20|45|-20|-45] 7. [0|90]S
[7 marks]What are the characteristics of super alloys?
[3 marks]Write note on Poisson’s ratio and its Mismatch effect.1
[7 marks]Derive Inplane Shear modulus with neat sketch.
[7 marks]Compare Polyester resins with Epoxy resins.
[4 marks]Aunidirectional fiber reinforced composite contains 55 % by volume of fibers. Evaluate the longitudinal tensile modulus and strength of this FRC. Given E1f=300GPa, σ1f=5.6GPa, Em=3.5GPa, σm=100MPa.
[7 marks]Compare Polyester resins with Epoxy resins.
[3 marks]Write in detail classification of laminates.
[4 marks]What is the need of Fillers? Explain in details.
[3 marks]