Skip to Main Content
ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
Search for other works by this author on:
ASM International
Volume
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

Fractures of Hot Dip Galvanized Steel Anchor Bolts in Chemical Plant Construction Project

By
George E. Kerns
George E. Kerns
E.I. DuPont de Nemours and Company, Inc.
Search for other works by this author on:
;
Charles E. Mighton
Charles E. Mighton
E.I. DuPont de Nemours and Company, Inc.
Search for other works by this author on:
Published:
1992
Page range:
328 - 331

Abstract

Galvanized A36 steel unsleeved shear-type anchor bolts failed during installation. The galvanized steel bolts were approximately 18 mm (0.7 in.) in diameter with a 90 deg bend between the long and short legs. As-fractured, sawcut, and unfractured specimens were examined. Failure analysis revealed dark thumbnail regions at the fracture origins and a very narrow and uniform shear lip. The thumbnail region exhibited zinc deposits with no apparent fracture detail, indicating preexisting cracks that had occurred before galvanizing. The balance of the fracture exhibited a transgranular mode with cleavage and ductile, dimpled shear. Hardness values as high as 35 HRC were measured in the bend area. The as-galvanized bolts fractured in a brittle manner. Failure was attributed to improper bending of the bolts, which provided a severely cold-worked bend area susceptible to strain-age embrittlement.

You do not currently have access to this content.
Don't already have an account? Register

George E. Kerns, Charles E. Mighton, 1992. "Fractures of Hot Dip Galvanized Steel Anchor Bolts in Chemical Plant Construction Project", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

Download citation file:


Close
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal