The longitudinal moisture expansion coefficient of a lamina is a function of the following (check all that apply)
(A) Young’s moduli of fiber and matrix
(B) Poisson’s ratio of fiber and matrix
(C) Volume fraction of fiber and matrix
(D) Density of fiber and matrix
(E) Moisture concentration in fiber and
matrix
(F) Coefficient of moisture expansion of
fiber and matrix
If the fibers do not absorb or deabsorb moisture, the longitudinal moisture expansion coefficient is a function of the following (check all that apply)
(A) Density of fiber and matrix
(B) Young’s moduli of fiber and matrix
(C) Coefficient of moisture expansion of
matrix
(D) Volume fraction of fiber and matrix
(E) Poisson’s ratio of fiber and matrix
For a lamina exposed to changes in moisture, it is generally assumed that
(A) the change in moisture concentration is
the same for the fiber and the matrix.
(B) the change in moisture concentration is
zero for the fiber
(C) the change in moisture concentration is
zero for the matrix
(D) the change in moisture concentration is
different for the fiber and the matrix.
For polymer matrix composites with high fiber to matrix Young’s moduli ratios and no absorption or deabsorption of water in fibers, the longitudinal coefficient of moisture expansion is
(A) same order as the transverse coefficient
of moisture expansion
(B) higher than the transverse coefficient of
moisture expansion
(C) close to zero.
The transverse moisture expansion coefficient is a function of the following (check all that apply)
(A) Moisture concentration in fiber and
matrix
(B) Volume fraction of fiber and matrix
(C) Young’s moduli of fiber and matrix
(D) Density of fiber and matrix
(E) Poisson’s ratio of fiber and matrix
(F) Coefficient of moisture expansion of
fiber and matrix
If the fibers do not absorb or deabsorb moisture, the transverse moisture expansion coefficient is a function of the following (check all that apply)
(A) Volume fraction of fiber and matrix
(B) Moisture concentration in matrix
(C) Density of fiber and matrix
(D) Young’s moduli of fiber and matrix
(E) Coefficient of moisture expansion of
matrix
(F) Poisson’s ratio of fiber and matrix