منابع مشابه
The Fracture Mechanics Concept of Creep and Creep/Fatigue Crack Growth in Life Assessment
There is an increasing need to assess the service life of components containing defect which operate at high temperature. This paper describes the current fracture mechanics concepts that are employed to predict cracking of engineering materials at high temperatures under static and cyclic loading. The relationship between these concepts and those of high temperature life assessment methods is ...
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Creep strength enhanced ferritic (CSEF) steels which contain 9 to 12%Cr have become the steels of choice in many industrial high energy systems. The typical compositions of alloy types P91, P92 and E911 are compared with 12CrMoV in Table 1. These steels are selected for use in applications where high temperature creep can occur because of a favorable balance between cost and properties [1,2]. T...
متن کاملCreep Behavior for Combined Rouse-Reptation Mechanism
Recoverable creep compliance JR(t) was analytically calculated for polymer chains relaxing through the Rouse and reptation mechanisms at short and long time scales, respectively. The ratio of the longest relaxation times of these mechanisms, rτ = τRouse/τrep, was varied from 0.056 to 0.0033. The calculation indicated that the effect of the fast Rouse mechanism on the distribution of slow modes ...
متن کاملCreep of a fracture line in paper peeling.
The slow motion of a crack line is studied via an experiment in which sheets of paper are split into two halves in a "peel-in-nip" (PIN) geometry under a constant load, in creep. The velocity-force relation is exponential. The dynamics of the fracture line exhibits intermittency, or avalanches, which are studied using acoustic emission. The energy statistics is a power law, with the exponent be...
متن کاملCreep and fracture of metals : mechanisms and mechanics
Modern methodologies that aim to reduce conservatism in the design of components operating at high temperatures rely on accurate predictions of materials’ behaviour in conditions relevant to those experienced in service. This requirement has focussed the attention of materials engineers on developing a quantitative understanding of damage-accumulation in engineering alloys. The microstructure o...
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ژورنال
عنوان ژورنال: Bulletin of the Japan Institute of Metals
سال: 1987
ISSN: 0021-4426,1884-5835
DOI: 10.2320/materia1962.26.801