Computed Tomography Analysis of Castings
Abstract
Under a preliminary testing task assignment of the Advanced Development of X-ray Computed Tomography Application program, computed tomography (CT) has been studied for its potential use in the analysis of castings. Because CT is quantitative, it offers a nondestructive evaluation (NDE) capability that can be used for engineering analysis, accurate dimensional measurement and for reconstructing three-dimensional models of cast components using Stereolithography. CT sensitivity to anomaly sizes has been measured by the use of image quality indicators. The sensitivity of a CT system, as a function of object size and system operating parameters, can be established and monitored. The three-dimensional location and definition of flaws, obtained from CT evaluation of castings, have been input into finite element engineering models to analyze the performance as a function of the casting condition. A significant cost savings in the manufacture of castings and their increased aerospace application is possible if CT evaluation and fitness-for-service criteria are used. Dimensional measurements with excellent accuracies and precision better than 0.050 mm (0.001 2 inch) have been demonstrated. The data sets from CT scanning have been converted to CAD/CAM files and input to a Stereolithography system to build a 3D plastic model of a part. Computed Tomography (CT), Castings, Image Quality Indicators (IQI), Defect, Defect sensitivity, Finite Element Analysis (FEA), Phantom, Stereolithography, Modulation, Noise, Dimensional measurement, Gap measurement.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 02, 1992
- Accession Number
- ADA249099
Entities
People
- Gary E. Georgeson
- Richard H. Bossi
Organizations
- Boeing Defense, Space & Security