Title: 3-D NONDESTRUCTIVE RESIDUAL STRESS MAPPING IN AN Al² O³ -Ni JOINT BONDED WITH A COMPOSITE LAYER.

Abstract:
Neutron diffraction mapping is an unparalleled techniques for mapping elastic strain tensors throughout the bulk of a specimen. The low absorption of neutrons in most materials permits nondestructive diffraction measurements within ~ specimen. The residual sums distribution is an axisymmetric Al² O ⁴/40 vol % Al² O³ - 60 vol % Ni/Nj specimen was snapped by this method. After taking into MCCOY the finite neutron diffraction sampling volume, both the trends and peak values of the measured strain distribution were in excellent agreement with calculations of a finite element model, where the rule-of-mixtures approach was ~ to describe the constitutive behavior of the composite interlayer. In particular, the predicted steep sin gradient near the 100% Al² O³ interface was confined by the experimental data. Neutron diffraction mapping can also be used for through thickness ODE phase content and textures mapping.
(Ref. SXVIII-013-97)

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
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