NASA Technical Reports Server (NTRS) : Fatigue pdf

NASA Technical Reports Server (NTRS) : Fatigue

More Book Details

Description of the Book:

Static and cyclic load tests were conducted to determine the static and fatigue strength of the RIS tile/SIP thermal protection system used on the orbiter of the space shuttle. The material systems investigated include the densified and undensified LI-900 tile system on the .40 cm thick SIP and the densified and undensified LI-2200 tile system on the .23 cm (.090 inch) thick SIP. The tests were conducted at room temperature with a fully reversed uniform cyclic loading at 1 Hertz. Cyclic loading causes a relatively large reduction in the stress level that each of the SIP/tile systems can withstand for a small number of cycles. For example, the average static strength of the .40 cm thick SIP/LI-900 tile system is reduced from 86 kPa to 62 kPa for a thousand cycles. Although the .23 cm thick SIP/LI-2200 tile system has a higher static strength, similar reductions in the fatigue strength are noted.

Densifying the faying surface of the RSI tile changes the failure mode from the SIP/tile interface to the parent RSI or the SIP and thus greatly increases the static strength of the system. Fatigue failure for the densified tile system, however, occurs due to complete separation or excessive elongation of the SIP and the fatigue strength is only slightly greater than that for the undensified tile system

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 11/1/1980
• Year: 1980
• Book Topics/Themes: NASA Technical Reports Server (NTRS), FATIGUE (MATERIALS), SPACE SHUTTLES, THERMAL PROTECTION, CYCLIC LOADS, FAILURE MODES, SPACE SHUTTLE ORBITERS, STATIC LOADS, STRESSES, Sawyer, J. W., Cooper, P. A

An excerpt captured from the PDF book