Analysis of thermal residual stress in WC-Ni composites using neutron diffraction and finite element methods. Ph.D. Thesis
Residual microstresses arising from the thermal expansion mismatch between phases in WC-Ni composites with particle volume fractions of 0.11, 0.21, 0.41 and 0.60 are studied using neutron diffraction and nonlinear plane stress finite element (FE) analysis. A method to interpret strain distributions from measurements of line broadening using FE results is developed. This method utilizes diffraction data to validate FE models which are then used to interpret the microstructural details of the stress distribution. The variation in composite microstress is confirmed as a major source of diffraction peak broadening in WC composites. The FE analysis indicates that models based on composite microstructures, as opposed to models consisting of regular arrays of particles, are necessary to properly model stress distributions. A means to approximate the breadth of the stress distribution from strain distributions measured with diffraction is presented. The effect of the thermal residual stress results on the stress-strain response of the material are considered.
- Research Organization:
- Missouri Univ., Columbia, MO (United States). Dept. of Electrical and Computer Engineering
- OSTI ID:
- 218169
- Report Number(s):
- N--96-21405; NIPS--96-34496
- Country of Publication:
- United States
- Language:
- English
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