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Notched Specimens (notched + specimen)

Distribution by Scientific Domains

Polymers and Materials Science	100%

Selected Abstracts

Stress corrosion cracking and selective corrosion of copper-zinc alloys for the drinking water installation,

MATERIALS AND CORROSION/WERKSTOFFE UND KORROSION, Issue 4 2009
E. Brandl
Abstract Despite a generally good corrosion resistance to tap and industrial water, many brass taps and fittings have failed in the past by stress corrosion cracking (SCC) and selective corrosion (dezincification or preferred removal of a phase). The experimental investigations of the present study clarify the influence of the ammonia concentration on the two types of corrosion. Notched specimens made of the alloys CuZn39Pb3, CuZn40Pb2, CuZn37, CuZn36Pb2As and CuZn21Si3P are polarized anodically in pure tap water and tap water with realistic ammonia concentrations (15 and 30 ppm) under a simultaneous mechanical loading condition. The influence of stress and of the third alloying elements lead and arsenic are investigated and evaluated. The experiments show that the ammonia additions significantly increase the risk of dezincification of the ,-,-brasses. The arsenic in the CuZn36Pb2As alloy avoids dezincification, but enhances the risk of SCC. The rate of selective corrosion and SCC consistently increases with increase in tensile stress. [source]

Fatigue Design of Notched Components with Stress Gradients and Cyclic Plasticity

ADVANCED ENGINEERING MATERIALS, Issue 9 2009
Mahaman Habibou Maitournam
This paper shows that the fatigue strength of notched specimens under cyclic loading can be simply and accurately estimated by using elastic-plastic computations and by averaging the stress over a critical volume obtained by an optimisation process, minimizing the dispersion between experiments and simulations. The Dang Van high-cycle fatigue criterion is considered. Fatigue tests (tension-compression, bending and torsion) carried out by CETIM, are used to calibrate the critical volume. [source]

Fatigue notch sensitivity of steel blunt-notched specimens

FATIGUE & FRACTURE OF ENGINEERING MATERIALS AND STRUCTURES, Issue 7 2002
M. D. CHAPETTI
ABSTRACT The notch sensitivity of three steels with similar plain fatigue limits was analysed and modelled. The analysis was made by using a model previously derived which estimated the fatigue limit of blunt notched components by means of the parameter ktd defined as the stress concentration introduced by the notch at a distance d from the notch root surface equal to the distance between microstructural barriers. The analyses show how the first two or three microstructural barriers define the fatigue limit and the fatigue notch sensitivity of blunt notched specimens. [source]

A statistical model for cleavage fracture in notched specimens of C,Mn steel

FATIGUE & FRACTURE OF ENGINEERING MATERIALS AND STRUCTURES, Issue 7 2001
G. Z. Wang
A statistical model for cleavage fracture in notched specimens of C-Mn steel has been proposed. This model is based on a recently suggested physical model. This statistical model satisfactorily describes the distributions of the cumulative failure probability and failure probability density of 36 notched specimens fractured at various loads at test temperature of ,196 °C. The minimum notch toughness has also been discussed. [source]