Publikationsdatum:
2019-06-27
Beschreibung:
The tension preload obtained by torquing a 7/8 in. diam UNC high strength bolt was determined for lubricated and dry conditions. Consistent preload with a variation of + or - 3% was obtained when the bolt head area was lubricated prior to each torque application. Preload tensions nearly 70% greater than the value predicted with the commonly used formula occurred with the lubricated bolt. A reduction to 39% of the initial preload was observed during 50 torque applications without relubrication. Little evidence of wear was noted after 203 cycles of tightening.
Schlagwort(e):
MECHANICAL ENGINEERING
Materialart:
NASA-TM-78501
,
A-7503
Format:
application/pdf
Permalink
