Previous Year Exam Questions for Composite Materials - CM of 2017 - bput by Verified Writer

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Registration no: Total Number of Pages: 01 B.Tech PEME5408 7th Semester Regular/Back Examination 2017-18 Composite Materials BRANCH : AUTO, CIVIL, MECH Time: 3 Hours Max Marks: 70 Q.CODE : B422 Answer Question No.1 which is compulsory and any five from the rest. The figures in the right hand margin indicate marks. Q1 i) j) Answer the followings : Which metals are used as matrix material in material matrix composites? Why do we use composites? What are the properties of anisotropic materials ? Why Fillers are used in composites. Explain the meaning of Macromechanical Behaviour of composite materials. Is concrete a composite material ? Explain. In composite usually which is the softer constituent and which is the stronger constituent. What are the properties that make glass fibers an important reinforcement material for composites ? What is Critical Volume Fractions ? What is a antisymmetric laminates.. Q2 a) b) Classify composite materials based on reinforcing material structure. . Briefly describe about mechanical behaviour of composites (5) (5) Q3 a) b) Derive the stress – strain relationship for specially orthotropic lamina. An unidirectional composite is composed of 65% by volume of carbon fibers in a epoxy resin matrix. Calculate the longitudinal modulus of the composite. Eepoxy = 4 GPa and Ecarbon =240 GPa (5) (5) Briefly describe about different manufacturing procedures for fibre-reinforced plastics. (10) Find the relationship of Engineering Constants using Micromechanical principles. Find the transformation relationships for a lamina with 300 fibre orientation with 1 axis. (5) a) b) c) d) e) f) g) h) Q4 Q5 a) b) (2 x 10) (5) Q6 a) b) Briefly describe about different test methods for composites. Discuss about inter-laminar stress and edge effect in laminate. (5) (5) Q7 a) For a continuous and oriented fiber reinforced composite, the moduli of elasticity in the longitudinal and transverse directions are 3.2 × 104 MPa and (5) b) Q8 3.6 × 103 MPa, respectively. If the volume fraction of fibers is 0.2, determine the moduli of elasticity of fiber and matrix phases. Briefly describe about FRP Composite Laminate designation and codes. Write short notes on any TWO : a) b) c) Advantages of Composite Materials. Classical Lamination Theory. Hybrid Composites. (5) (5x2)