Residual stress distribution in an Al(sub 2)O(sub 3)-Ni joint bonded with a composite layer

摘要

Neutron diffraction was used to study the residual stress distribution in an axisymmetric Al(sub 2)O(sub 3)-Ni joint bonded with a 40 vol% Al(sub 2)O(sub 3)-60 vol% Ni composite layer. A series of measurements was taken along the axis of symmetry through the Al(sub 2)O(sub 3) and composite layers. It is shown that after taking into account the finite neutron diffraction sampling volume, both the trends and peak values of the experimental strain distribution were in excellent agreement with calculations of a simple finite element model, where the rule-of-mixtures approach was used to describe the constitutive behavior of the composite interlayer. In particular, the predicted steep strain gradient near the interface was confirmed by the experimental data.