Download GTU B.Tech 2020 Winter 7th Sem 2170107 Mechanics Of Composite Materials Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

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1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

1. (a) Define the term Composite Material and its various types. 03
   

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   (b) Explain Carbon fibers. 04
   (c) Explain in detail advantage and disadvantage of composite material. 07
2. (a) What is the role of Reinforcement and Matrix in composite material? 03
   (b) Describe the basic assumption of the analysis of laminated composite. 04
   (c) Discuss in details anti symmetric laminates. 07

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3. (a) What is the total no. of independent elastic constant of General anisotropic material, Monoclinic material and Isotropic material? [Only Value] 03
   (b) Describe the following terms with the sketch.(Any two) 04
   
   1. Metal Matrix Composite (MMC)
   2. Laminate.
   3. Particle reinforced.

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   (c) Derive equations for volume and weight fractions 07
4. (a) For an orthotropic lamina, engineering constant along he principal material axes are E1=150 Gpa, E2=20 Gpa, G12 =5 Gpa, v12=0.2. 03
   (b) What do you understand by the mechanical behavior of composite materials? 04
   (c) Derive equations for longitudinal strength and stiffness. 07
5. (a) What is the need of Fillers? Explain in details 03
   

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   (b) Write a short note on Poisson’s Mismatch effect. 04
   (c) Derive the equation for the stress - strain relationship in composite laminate with equilibrium equation. 07
6. (a) Explain about prepegs. 03
   (b) Describe the Relation between stiffness coefficient Cij and compliance component Sij. 04
   (c) Identify the type of laminate given below: 07
   

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   1. [90]0]
   2. [45|0|-45]
   3. [+30]
   4. [0[90]0190]
   5. [20|45|-20|-45]

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8. (a) Name the methods to find properties of FRCs on the basis of its constituent elements. 03
   (b) Write down the significance of fillers and additives in composite materials in detail. 04
   

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   (c) Derive In-Plane Sher modulus and transverse ratio. 07
9. (a) Write a note on Aramid fibers. 03
   (b) The E-glass fiber in a polyester resin is 35% by weight. 04
   Given pf=2.50 gm/ml and pm = 1 gm/ml.
   Calculate Vf and pc for the lamina.
   

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   (c) Describe the stress-Strain relation of a monoclinic material. 07