NASA/TP-3558, Verderaime, V. and Harrington, F., Test Load Verification Through Strain Data Analysis, Structures and Dynamics Laboratory, Science and Engineering Directorate. NASA Marshall Space Flight Center, AL 35812, May 1995, pp. 22, Format(s): PDF 260k |
A traditional binding acceptance criterion on polycrystalline structures is the experimental verification of the ultimate factor of safety. At fracture, the induced strain is inelastic and about an order-of-magnitude greater than designed for maximum expected operational limit. At this extreme strained condition, the structure may rotate and displace at the applied verification load such as to unknowingly distort the load transfer into the static test article. Test may result in erroneously accepting a submarginal design or rejecting a reliable one. A technique was developed to identify, monitor, and assess the load transmission error through two back-to-back surface-measured strain data. The technique is programmed for expediency and convenience. Though the method was developed to support affordable aerostructures, the method is also applicable for most high-performance air and surface transportation structural systems.
| Keywords: | safety factors verification, deterministic verification, verification from strain data, inelastic strain data analysis, verification load discrepancy, boundary loads distortion, inelastic normal and bending loads, normal-bending loads analysis |
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| CASI Document ID Number: | 95N28718 |
| Subjects: | Astronautics: Launch Vehicles And Launch Operations: Launch Vehicles |
| ID Code: | 273 |
| Deposited On: | 26 June 2002 |