7 Has the same composition at any point? a. Isotropic b. Composite c. Prismatic d. Homogeneous 8. The composite material exhibits elastic properties in one direction different from that in the perpendicular direction. Orthotropic b. Anisotropic Isotropic d. Aeolotropic а. с. Materials having the same properties in all directions. a. Isotropic b. Anisotropic c. Aeolotropic d. Orthotropic 10 The term for the value above which the stress is no longer proportional to the strain. Proportional limit b. Plastic Range Rupture Stress Elastic Range a. с. d.

7 Has the same composition at any point? a. Isotropic b. Composite c. Prismatic d. Homogeneous 8. The composite material exhibits elastic properties in one direction different from that in the perpendicular direction. Orthotropic b. Anisotropic Isotropic d. Aeolotropic а. с. Materials having the same properties in all directions. a. Isotropic b. Anisotropic c. Aeolotropic d. Orthotropic 10 The term for the value above which the stress is no longer proportional to the strain. Proportional limit b. Plastic Range Rupture Stress Elastic Range a. с. d.

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.13P

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Similar questions

In Example Problem 12.1, a uniaxial composite material is made into a circular rod Vbith a 1.27-cm diameter from 70 volume percent continuous carbon fibers and 30 volume percent epoxy. The rod is subject to an axial force of 100,000 N. The composite matcrial in Example Problem 12.1 is to be replaced with a less expensive composite made of 70 volume percent continuous E-glass fibers and 30 volume percent epoxy. The elastic moduli are 5 GPa for the epoxy resin and 72.4 GPa fos the E-glass. (a) Compare the elastic modulus, composite strain, fiber and matrix stresses, and density of this composite with the carbon epoxy composite in Example Problem 12.1. Usc the density of UHM carbon, and assume the density of the epoxy is 1.2g/cm3 . (b) Can both the E-glass fiber and matrix withstand the applied force?
A composite sample of carbon reinforced epoxy has dimensions of in 20 in x 20 in x 0.135 in and mass of 3 lb. The carbon fibres have a modulus of elasticity of 80(106) lb/in2 and a density of 0.15 lb/in3. The epoxy matrix has modulus of elasticity of 0.90(106) lb/in2 and a density of 0.05 lb/in3. Assume there are no voids in the sample, calculate the volume fraction of: (i) The carbon fibres (ii) The epoxy matrix in the sample.
Calculate the modulus of elasticity of fiberglass under isostrain condition if the fiberglass consists of 70% E-glass fibers and 30% epoxy by volume. Also, calculate the percentage of load carried by the glass fibers. The moduli of elasticity of the glass fibers and the epoxy are 70.5 and 6.9 GPa, respectively. If a longitudinal stress of 60 MPa is applied on the composite with a cross-sectional area ofm300 mm2, what is the load carried by each of the fiber and the matrix phases? What is the strain sustained by each of the fiber and the matrix phases?
#2: For the composite area shown, calculate the moment of inertia about X and Y axes.
Determine the maximum moment of inertia of the composite figure shown below, in mm^4.