Question B4 Carbon fibres typically have a modulus of 230 GPA, a tensile strength of 3.8 GPa and a density of 1.78...
Please Answer this in full detailed as I am unable to get the full grasp of this topic a) Calculate the modulus of a cross-ply HS-carbon/epoxy laminate. Longitudinal fibre modulus (En)-230 GPa; transverse fibre modulus (E122)-20 GPa; matrix modulus (En)-3 GPa; fibre volume fraction (V) : 60%. [5 marks] b)(1) Explain the difference in failure of a single fibre in air and a single fibre embedded [5 marks] in a matrix. (2) How can a test that involves the fracture...
It is desired to produce an aligned carbon fibre-epoxy matrix composite having a longitudinal tensile strength of 462 MPa. Calculate the necessary volume fraction of fibres- Assume the following: (1) the average fibre diameter and length are 9.03 x 10 mm and 0.434 mm, respectively (2) the fibre fracture strength is 4.0 GPa (3) the fibre-matrix bond strength is 25 MPa (4) the matrix stress at composite failure is 70 MPa Express answers with three significant figures
Assume a composite made from a fibre volume fraction of 50% using uni directional, continuous fibres and a thermoset matrix. Sketch one stress-strain diagram showing the expected tensile behaviour of the fibre, matrix and composite, loaded in a direction parallel with the fibre orientation Use the following values for the properties of the matrix and fibre: Strain to failure (% Strength (GPa) Fibre 2 Matrix 0.3 10 Assume a composite made from a fibre volume fraction of 50% using uni...
For an aligned carbon fibre-epoxy matrix composite having a 0.25 volume fraction of fibres, compute the critical fibre length = Assuming the following: 1) an average fiber diameter of 7.80 x 10 mm 2) an average fiber length of 9.3 mm 3) a fiber fracture strength of 4.5 GPa 4) a fiber-matrix bond strength of 75 MPa 5) a matrix stress at composite failure of 6.0 MPa 6) a matrix tensile strength of 60 MPa. Express answers with three significant...
A3. For polymer composites reinforced polymer composites, the resultant tensile strength is largely determined by the volume contents of fibers (as shown in the figure). If glass fibers are used for reinforcing (a) detemine the minimum volume content, Fmin, which will not cause multiple-fracture. [0.5 Marks] (b) detemine the minimum volume content, OFari, which will ensure that the strength of the composites is not less than that of neat epoxy. [0.5 Marks] an epoxy 60 GPa and tensile strenght a...
A unidirectional glass fiber-epoxy matrix composite containing 65 vol% fiber, calculate the modulus of elasticity in the longitudinal direction and the transverse direction. Epoxy has a density of 1.54 g/cm3, modulus of elasticity of 3.5 GPa, yield strength of 60 MPa, tensile strength of 95 MPa, and Poisson’s ratio of 0.33. Glass fiber has a Poisson’s ratio of 0.22.
Subject: Composite Materials Determine the longitudinal modulus E1 and longitudinal tensile strength F1t of a unidirectional carbon/glass composite with the properties: Vf = 0.45 , E1f = 235 GPa , Em = 70 Gpa , Fft = 3500 MPa , Fmt = 140 MPa (*Note: Strength is defined as the composite stress at failure initiation in one of the phases.) Determine the longitudinal modulus Ej and longi- tudinal tensile strength F, of a unidirectional carbon/ 5.3 glass composite with the...
You can choose between fibres with critical fibre lengths of 0.4, 0.8, or 1.2 mm, all of which have the same strength and stiffness. Which fibre should you choose to achieve the strongest and stiffest composite? Explain your choice. (4 marks) 15.) designing a composite using short glass fibres and an epoxy resin. You are Page 4 of 11 Mid-year Examinations, 2018 PROD111-18S1 (C) 16.) Define specific heat and thermal conductivity. Why are those two properties important for the perception...
In an aligned and continuous carbon fiber-reinforced nylon 6,6 composite, the fibers are to carry 94 % of a load applied in the longitudinal direction. Modulus of Elasticity [GPa(psi)] Tensile Strength [MPa(psi)] Carbon fiber 260 (37 ×106) 4000 (5.8 ×105) Nylon 6,6 2.8 (4.0 ×105) 76 (11,000) (a) Using the data provided, determine the volume fraction of fibers that will be required. (b) What will be the tensile strength of this composite? Assume that the matrix stress at fiber failure...
Question B6. Which of the following is not correct? (a) The modulus of timber depends on the density of the timber. (b) Timber is a composite based on cellulose polymers which means that its properties are time dependent and timber will creep with time under load. (c) The toughness of timber is reduced by the presence of knots and defects in the structure. (d) Timber is usually dried before use to reduce its moisture content and reduce warping during use....