Results 171 to 180 of about 1,100 (217)

Creep and creep damage of glass fibre reinforced polypropylene

Composite Structures, 1993
Abstract Composites based on isotactic polypropylene matrix and short glass fibres were tested for creep, creep damage and creep rupture at different temperatures and stress levels. Four composites of 5–30 wt% of glass fibre content having standard fibre/matrix adhesion were used, while two materials with 20 and 30 wt% of fibres were prepared as ...
J. Hugo, M. Sova, J. Čižinský
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Creep Damage and Creep-Fatigue Damage Interaction Model for Unidirectional Metal-Matrix Composites

1997
A multiaxial, isothermal, continuum damage mechanics model for creep and creep-fatigue interaction of a unidirectional metal-matrix composite (MMC) volume element is presented. The model is phenomenological, stress based, and assumes a single scalar internal damage variable with directional-dependent evolution.
S Kruch, SM Arnold
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Creep buckling considering material damage

International Journal of Solids and Structures, 1975
Abstract The influence of Kachanov-Rabotnov type damage on creep buckling of a compressed column is investigated. All deformation and damage of the column is assumed to take place at a “creep and damage hinge”. Instantaneous buckling as well as creep buckling are shown to be represented by a certain instability surface in strain-damge-load space. The
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Creep Damage Mechanisms in Si3N4

1994
Cavitation was characterized on commercial grades of silicon nitride by transmission electron microscopy, small angle X-ray scattering and precision density measurements. The type of cavitation depends on both the microstructure and the test temperature.
S. M. Wiederborn, W. E. Luecke, B. J. Hockey, G. G. Long   +3 more
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Study on metallographic damage parameter in creep-damage-dominant condition under creep-fatigue loading

Nuclear Engineering and Design, 1996
Abstract The microstructural changes of type 304 stainless steel in the creep-dominant condition under creep-fatigue loading were investigated and the representativeness of some metallographical damage parameters (MDPs) was studied. A series of creep-fatigue tests was conducted at low total strain range and long strain hold time.
Fumiyoshi Ueno, Kazumi Aoto, Yusaku Wada
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Creep Damage Detection of Steels

2003
Structural metals are subject to aging from fatigue, creep, corrosion, irradiation, and their combination. Exposure to high temperatures promotes creeping and stress-corrosion cracking. Aged metals lose toughness, or ability to absorb energy for stresses above the yield point. They cannot withstand the occasional high loads without fracturing.
Masahiko Hirao, Hirotsugu Ogi
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Creep damage and expected creep life for welded 9–11% Cr steels

International Journal of Pressure Vessels and Piping, 2007
The damage mechanisms affecting engineering steels at high-temperatures include creep cavitation and cracking that can form the path for final failure in susceptible locations such as welds. The evolution of observed damage is widely used in condition monitoring, timing of inspections and support of life management.
Holmström, Stefan, Veivo, Juha, Salonen, Jorma, Auerkari, Pertti   +4 more
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Creep damage in reformer tubes

International Journal of Pressure Vessels and Piping, 1983
Abstract The effect of start-up and shutdown on creep damage in reformer tubes has been calculated and found to be the main cause of failure. The effect of different time/temperature profiles was investigated and the start-up and shutdown procedures found to be very relevant to the amount of creep damage done. The same calculations on tubes with half
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Modeling creep damage based on real microstructure

Practical Failure Analysis, 2002
This paper outlines a method to model creep failure of polycrystalline materials based on a real microstructure taken from an optical microscope. The creep failure is simulated in 304 stainless steel and the simulation is based on Norton’s creep law. By treating the grain boundaries and the grains differently and adopting the void nucleation process ...
Y. Prawoto, T. Aizawa
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Predicting creep damage

Plant/Operations Progress, 1982
Yoshiaki Imoto, Susumu Terada, Kouhei Maki   +2 more
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