Publication Date:
2019-07-13
Description:
Beryllium fracture toughness test specimens were fatigue cracked using reversed cycling with a compression load two to three times the tension load. In worked beryllium, textures may be produced which result in fatigue cracks that are out of plane with the starter notch. Specimens of hot pressed stock exhibited load displacement records which were nonlinear throughout their course. Fracture specimens of both hot pressed and forged stock showed essentially no reduction of thickness and the fracture surfaces were flat and normal to the load axis. However, the stress intensity factor at maximum load increased with decreasing thickness. Load-displacement and electric potential records for the hot pressed beryllium specimens exhibited several anomalies such as negative residual crack mouth displacements and a decrease in electrical potential with increasing load.
Keywords:
MATERIALS, METALLIC
Type:
NASA-TM-X-67967
,
E-6681
,
Am. Soc. for Testing Mater. Comm. on Fracture Testing of Beryllium; Dec 08, 1971 - Dec 09, 1971; Cleveland
Format:
application/pdf
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