Test Methodology Correlation for Foreign Object Damage
Abstract
The adaptation of advanced composite materials in fan blades requires the evaluation of their resistance to damage from foreign object impacts. An alternative approach to testing full-scale blades is to use laboratory material coupon impact tests and complimentary analysis methods to simulate and predict performance of composite materials in full-scale blades. This study provided an assessment and development of laboratory coupon tests for evaluating potential fan blade materials. Both simple and sophisticated elastic beam blade impact analyses and programs were used. In the first phase, 24 impacted cantilevered and simply-supported specimens of different materials were analyzed, and the predicted maximum stressing and time history stressing and damage results were found to compare favorably with the test results. Because the local and gross spanwise critical stressing occurs at separate places in the cantilever specimen, but at the same location in the simply-supported specimen, and because the support action of the latter is nonlinear, the cantilever specimen was found to be the better specimen to study the gross resistance of materials to impact. The second phase consisted of evaluating six rotating blade impact cases and comparing the theoretical and test results. The correlation was good for large missile impacts but only fair for small missile impacts.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1978
- Accession Number
- ADA057322
Entities
People
- Robert W. Cornell
- Tan F. Wong
Organizations
- United Technologies Corporation