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Eisengusswerkstoffe
Dokumenten-Nummer: 57818
Tagungsbeitrag
Aso, Setsuo; Ike, Hiroyuki; Ohguchi, Kenichi; Komastu, Yoshinari; Konishi, Nobuo
Publikationssprache: Englisch
Bending Strength of Cast Materials Reinforced with Hard Particles
Biegefestigkeit von Gusswerkstoffen verstärkt mit Hartstoffteilchen
Particle reinforcement via the insertion of hard particles is a promising process in materials reinforcing.
Particle-reinforced spheroidal graphite martensitic cast iron (SGMC), in which mixed particles of cermet and cemented
carbide are dispersed, was achieved by an insertion process. A four-point bending strength test was applied to evaluate
the particle composite material. An evaporative pattern process was used on the bending-test specimen to form a
composite layer in the central part. Using a combination of three sizes of cermet particles and two sizes of
cemented-carbide particles, the bending strength was found to increase with each small-particle combination. The
Weibull coefficient m of the four-point bending strength of the particle-reinforced composite material (PRCM) ranged
from 4 to 13, and m was large in the specimen with large bending strength.
Akita University, JP; Iwate Industrial Research Institute, Morioka, JP; Konishi Foundry, Iwate, JP
Erscheinungsjahr 2010
S. S.404-409
Seiten/Bilder/Tabellen/Quellen: 6S
Eisengusswerkstoffe
Dokumenten-Nummer: 57854
Tagungsbeitrag; 6$43
Atzori, Bruno; Bonollo, Franco; Meneghetti, Giovanni
Publikationssprache: Englisch
Notch Fatigue and Fracture Mechanics of Austempered Ductile Irons
Kerbermüdung und Bruchmechanik von Austempered Ductile Iron
In this paper the fatigue characterization of an austempered ductile iron (ADI) is presented. The aim of the work is to
provide design engineers involved in fatigue assessments with an engineering tool suitable to deal with notches of
different severity. Classically, U-notches are divided into blunt notches and sharp notches. The former are characterized
by large notch tip radii such that the high cycle fatigue strength is controlled by the elastic peak stress, i. e. by the
elastic stress concentration factor. The latter are characterized by reduced notch tip radii such that the effective stress
which controls the high cycle fatigue strength is significantly lower than the elastic peak stress and their behaviour
become similar to that of a crack having the same length. Blunt notches are assessed according to the classical Notch
Mechanics principles, while sharp notches are treated with the Linear Elastic Fracture Mechanics approach. After
presenting the classical Frost diagram which highlights the different fatigue behaviour of sharp and blunt notches,
fatigue test results generated from notches of different severity are presented as well as a synthesis in a diagram able
to account for short cracks/notches, long cracks, sharp notches and blunt notches.
Universita di Padova, IT; Universita di Padova, Vicenza, IT
Erscheinungsjahr 2010
S. S.181-186
Seiten/Bilder/Tabellen/Quellen: 6S
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