Determine the required volume fraction

Assignment Help Mechanical Engineering

Reference no: EM133021856

SEHS4620 Advanced Materials for Design and Technology - The Hong Kong Polytechnic University

Q1) A 50 mm cube of graphite reinforced material is subjected to a 125 KN compressive force perpendicular to the fiber direction, specifically in 2-direction, Figure 1(a) below. Suppose the cube is simultaneously constrained against deformation in both 1 and 3-directions. Compute the stresses required to constrain the deformation in these directions.

Q2)
(a) Figure Q2(a) shows the window frame and the cross-sectional view of the window frame manufactured by a local company. An engineer in this company comments, "Window frames are another excellent use of fibre reinforced polymer (FRP) composite, most commonly fiberglass."
(i) Window frame (ii) Cross-sectional view of window frame

(i). Suggest a manufacturing method to produce the FRP composite window frame and justify your answer by giving TWO reasons.

(ii). Suggest TWO possible failures if a large force is pushing on the frame perpendicularly.

Q3). The mechanical properties of the fibreglass and polymer matrix are listed in Table (Q3). The stress of polymer matrix is 25 MPa when fibreglass fails.

	Fibreglass	Polymer matrix
Poisson's ratio, ν	0.21	0.389
Elastic modulus, E	72 GPa	35.9 GPa
Tensile strength, σ	1950 MPa	33.7 MPa

(i). Determine the required volume fraction of reinforcement and matrix if the elastic modulus of composite is 64GPa.

(ii). Determine the tensile strength of the composite based on the volume fractions determined in part (i).

Reference no: EM133021856

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