Abstract
The stress measurement methods by using Neutron and X-ray diffraction were examined with regard to compare the surface stresses with the internal stresses in the continuous tungsten-fiber reinforced copper-matrix composite. The surface stresses were easily measured by X-ray stress measurement with ordinary sin^2ψ method. However, for the internal stress by Neutron diffraction, the most common triaxial measurement method with Hooke's equation was only possible to measure about 110 plane, because the tungsten fiber became the situation of heavy 110 orientation. Therefore, the stress values against 200 and 211 plane could be determined by employing the sin^2ψ method used with Neutron diffraction. The d- sin^2ψ diagram was shown the good linearity in not only 200 plane but also 110 and 211 plane. Clearly, the stresses are possible to be determined by the gradient of sin^2ψ diagram in the Neutron stress measurement. However, if the sin^2ψ method was applied in the Neutron stress measurement, the stress σ_<11>-σ_<33> was estimated in the inner part of the body due to the existence of the σ_<33>. These influences of the stress σ_<33> were discussed in this study. Furthermore, the microstress distributions were calculated by the three-dimensional FEM elastic analysis and compared with the experimental results.
