Which of the following will expand the most with temperature?
(A) Aluminum.
(B) Graphite/epoxy unidirectional laminate in
the direction along the fibers.
(C) Glass/epoxy unidirectional laminate in
the direction along the fibers.
(D) Steel.
Which of the following will expand the most with temperature?
(A) Steel.
(B) Aluminum.
(C) Boron/Epoxy unidirectional lamina with
50% FVF in the direction perpendicular
the fibers.
All of the following laminates will undergo bending from thermal loads EXCEPT?
(A) [0/45/90/45/-45].
(B) [0/45/-45].
(C) [0/45/90/90/45/0].
(D) [0/30/-45].
Hygrothermal stresses and strains are caused by
(A) Changes in humidity and temperature.
(B) Mechanical loads.
(C) Water pressure
(D) Air pressure
If a hygrothermal load is the only load applied to a lamina, the overall mechanical load is equal to
(A) the same magnitude as the
hygrothermal load.
(B) zero.
(C) slightly less than the hygrothermal load.
(D) the inverse of the hygrothermal load.
Hygrothermal forces are considered fictitious thermal forces because
(A) they act like mechanical forces, but no
mechanical force is present.
(B) they are uncommon.
(C) they don’t exist.
(D) they can only be produced in a
laboratory.
Non-symmetric laminates undergo this when hygrothermal loads are applied
(A) Only in-plane extensional strains
(B) Warpage
(C) No warpage
To find the longitudinal linear coefficient of thermal expansion of a symmetric laminate using theoretical methods, one can apply a change in temperature of ΔT=1. What then is the measure of the longitudinal linear coefficient of thermal expansion of the laminate?
(A) The mid-plane curvature, κx
(B) The mid-plane strain, ϵxo
(C) The mid-plane curvature, κy
(D) The mid-plane strain, ϵy0