SEDL / STP / STP556-EB / STP33122S

Flexural Fatigue Testing of Titanium Forging Material in Liquid Hydrogen

Adsit, NR
Senior engineering metallurgist and design specialist, General Dynamics Corp., San Diego, Calif.

Dessau, P
Chief metallurgist, AIRCO Viking, Verdi, Nev.

Witzell, WE
Senior engineering metallurgist and design specialist, General Dynamics Corp., San Diego, Calif.

Pages: 11    Published: Jan 1974

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Abstract

The program described is the fatigue testing of titanium 5Al-2.5Sn material cut from production forgings. The high-cycle fatigue testing was carried out in a liquid hydrogen environment. Forging from two different mills were used, and these were tested in various directions.

A cantilever beam type specimen tapered to provide constant stress across the length was used throughout this program. A special cryostat was made and adapted to standard fatigue testing machines.

There was a sizeable amount of scatter in the data, but 50 percent survival curves were constructed. There was no evidence of directionality, but there was a large difference between materials. This difference may be explained by the metallurgical structure.