The Measurement of Stresses in Composites.
NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE
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Although there is mounting interest in the measurement of stresses in composite materials after fabrication andor use, few measurements to date have taken into account the three dimensional nature of the stress system in such materials. Most data gives only the net stress, that is the difference between principal stresses. This report develops a procedure for a more complete measurement in a reasonable time, including the separation of macrostresses and microstresses. if time does not permit a full investigation, measurements of the lattice parameters of the component phases provide a simple way to sample the hydrostatic component due to differential thermal contraction. The Barrett Predecki method of adding filter is particularly promising for stress measurements in those composites whose component phases do not give appropriate diffraction peaks. This procedure could also be used for monitoring stresses during the useful life at such materials. Keywords Residual stresses, Diffraction.
- Laminates and Composite Materials
- Test Facilities, Equipment and Methods