Abstract :
The interface layer plays an important role
in stress transfer in composite structures. However,
many interface layer properties such as the modulus,
thickness, and uniformity are difficult to determine. The
model developed in this article links the influence of
the interface layer on the normal stress distribution
along the layer thickness with the layer surface morphology
before bonding. By doing so, a new method of
determining the interfacial parameter(s) is suggested.
The effects of the layer thickness and the surface
roughness before bonding on the normal stress distribution
and its depth profile are also discussed. For ideal
interface case with no interfacial shear stress, the
normal stress distribution pattern can only be monotonically
decreased from the interface. Due to the
presence of interfacial shear stress, the normal stress
distribution is much more complex, and varies dramatically
with changes in the properties of the interface
layer, or the dimensions of the bonding layers. The
consequence of this dramatic stress field change, such
as the shift of the maximum stress from the interface is
also addressed. The size-dependent stress distribution in
the thickness direction due to the interface layer effect
is presented. When the interfacial shear stress is
reduced to zero, the model presented in this article is
also demonstrated to have the same normal stress distribution
as obtained by the previous model, which does
not consider the interface layer effect.
