(Multiple choice) Which one of the following statements is true? Explain why T/F
ID: 882385 • Letter: #
Question
(Multiple choice)
Which one of the following statements is true? Explain why T/F for each.
(a) In fiber reinforced composites, the dispersed phase will not have the same composition as
the matrix phase.
(b) When continuous-fiber reinforced composites are loaded longitudinally, the stress in the
fibers equals the stress in the matrix.
(c) Sandwich panels are useful because of their high weight-to-stiffness ratio.
(d) Approximately 30% of the overall strength of fiberglass is contributed by the matrix.
(e) The stiffness of aligned discontinuous-fiber reinforced composites loaded along the fiber
direction depends on the weight fraction of matrix in the composite.
Explanation / Answer
a) True : A Composite Material is a materials system composed of a mixture or combination of two or more micro- or
macro-constituents that differ in form and chemical composition and which are essentially insoluble in each
other. Generally, Composite Materials consist of a Dispersed Phase (Fibers) and a Matrix Phase.
- The Matrix Phase generally surrounds the Dispersed Phase.
- The Dispersed Phase is generally contained within the Matrix Phase
b) False : As Isostrain ( same strain) – referred to as the Longitudinal direction in composite fibres. while Isostress (equal stress) referred to as the transverse direction.
c) True: This is the advantage of sandwich panels that they are made up of two thin layers of a metal a low density core is inserted like a sandwich. So it allows us to design a structure of low weight with a high mechanical strength
d) FAlse : It will depend upong the matrix amount
e) False: It depends upon angle of fibres
d)
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