Composite Structures Design, Mechanics, Analysis, Manufacturing, and Testing 1st. Edition by Manoj Kumar Buragohain | 9781138746671 | 1351974920 | Holooly

Composite Structures

Composite Structures Design, Mechanics, Analysis, Manufacturing, and Testing

42 SOLVED PROBLEMS

Question: 14.6

Design a cantilever beam of length 400 mm and width 25 mm to carry a tip lateral load of 5 N. Restrict the tip deflection within 1.0 mm. Use unidirectional carbon/ epoxy prepreg with the following material data: E1 = 130 GPa, E2 = 6.5 GPa, G12 = 5.0 GPa, ν12=0.25. Each prepreg ply is of 0.25 mm ...

Verified Answer:

Option-1 Solid rectangular cross section (plies no...

Question: 14.8

Design the composite shell of a cylindrical pressure vessel with an inner diameter of 200 mm and a cylindrical length of 800 mm. Internal pressure is 20 MPa. The end domes are hemispherical in shape and reinforced by polar end fittings that have equal composite pole opening diameters of 40 mm ...

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Let us provide meridional stiffness to the pressur...

Question: 14.7

Design a rectangular flat panel of length 1200 mm and width 800 mm subjected to in-plane tensile force of 5000 and 3000 kN, respectively, in the longitudinal and lateral directions in addition to an in-plane shear force of 1200 kN acting on the longitudinal edge. The normal and shear deformations ...

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Taking a factor of safety of 1.25, the force resul...

Question: 14.5

A platform weighting a total of 6400 kN is supported by four struts of height 4000 mm each. Assuming the total load is equally shared, design the compression members with circular cross section. Use the carbon/epoxy composite with the following material data: E1 = 130 GPa, E2 = 6.5 GPa, ...

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Let us consider a tubular compression member compo...

Question: 14.4

Determine the elongation of the tension member designed in Example 14.3. Consider the following data: E1=130 GPa, E2=6.5 GPa, G12=5.0 GPa, and ν12=0.25 . If the axial elongation is to be limited to 0.02 mm, what should be the design modifications, if any? ...

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Axial Winding Using Equation 14.56, the axial modu...

Question: 14.3

Design a tension member of length 800 mm and outer circular cross section to carry a tensile load of 750 kN. The material available is carbon/epoxy composite. Unidirectional carbon/epoxy composite properties at Vf = 0.6 are E1 = 130 GPa, X^T = 2400 MPa, and ρc = 1.53 g/cm³ ...

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Let us consider a tubular cross section and choose...

Question: 14.1

Design, adopting a micromechanics-based approach, a tension member of length 600 mm for carrying a static uniaxial tensile load of 200 kN. Consider the following as available material systems: Carbon fiber reinforcement: E1f = 230 GPa, (σ1f^T) = 4900 MPa. ρf = 1.80 g/cm³. Kevlar fiber reinforcement ...

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Let us first choose the manufacturing method for m...

Question: 14.2

Consider the data given in Example 14.1. If the axial elongation is to be limited to 0.01 mm, design the tension member adopting a micromechanics-based approach. ...

Verified Answer:

Using Equation 14.54,

A=\frac{PL}{E_{1c}\De...

Question: 10.2

Solve the problem in Example 10.1, if the ply thickness is experimentally found to be 0.4 mm for two rovings at a programmed bandwidth of 5 mm. What is the estimated fiber volume fraction? ...

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The required programmed bandwidth is arrived at as...

Question: 8.1

Find the stress at mid-height of the axially loaded bar shown in Figure 8.8a. Take Young’s modulus of the bar material as E = 70 GPa. ...

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The bar is discretized using three elements as sho...

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