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Book Chapter
Investigation on a Damaged Propeller Blade
Available to PurchaseSeries: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001708
EISBN: 978-1-62708-217-4
... blade by approximately 40%. Casting defects Icebreakers Propeller blades Superston 70 C95700 UNS C95700 Brittle fracture Casting-related failures Introduction In the past Fleet Technology Ltd. has carried out a number of investigations on damaged propellor blades from ice breaking...
Abstract
The paper describes the findings from a damaged propeller blade made from Mn-Ni-Al-bronze, commercially known as Superston 70 (ABS Type 5). The blade had broken at the 0.65 pitch radius location, and the fracture occurred in a brittle mode. The findings reported here point to two potential contributors to the propeller blade failure, viz., the presence of casting flaws at the low pressure side of the propeller blade and service stresses at this surface that reached approximately 400 MPa. This stress value exceeded the yield strength at the corresponding location of the unbroken blade by approximately 40%.
