A failure analysis was conducted on the collapse of the NIST WWVB tower. The analysis included mechanical testing, chemical analysis, and metallographic examination of the failed part. We ascertained that the underlying reason for the collapse was fatigue failure due to poor engineering design and improper specifications on the insulator pin. Based on our findings, we recommend new pins be fabricated using recommended engineering practices with particular attention paid to details such as tolerances, radii, material choice, and heat treatment procedures.
Citation: NIST Interagency/Internal Report (NISTIR) - 6619
NIST Pub Series: NIST Interagency/Internal Report (NISTIR)
Pub Type: NIST Pubs
antenna, fatigue, fracture, insulator pin, support pin, tower