نتایج جستجو برای: cracking elements method
تعداد نتایج: 1871470 فیلتر نتایج به سال:
In this paper, the cyclic fatigue hysteresis loops of 2D woven SiC/SiC ceramic matrix composites (CMCs) at elevated temperatures in steam have been investigated. The interface slip between fibers and the matrix existing in matrix cracking modes 3 and 5, in which matrix cracking and interface debonding occurred in longitudinal yarns, is considered as the major reason for hysteresis loops of 2D w...
Sunlight heats the greenhouse air temperature and tomato cracking decreases marketable product up to 90%. A shade screen reduced incoming radiation during warm and sunny conditions to reduce tomato cracking. A fuzzy controller managed greenhouse irrigation to reduce tomato cracking using as variables solar radiation and substrate temperature. The embedded controller presented 9 rules and three ...
The motivation of the study is the development of a coupled approach able to account for the interaction between environment and plasticity in a polycrystalline material. The paper recalls first the constitutive equations used to describe the behaviour of the grain core and of the grain boundary (GB). The procedure that is applied to generate synthetic polycrystalline aggregates with an explici...
This paper discusses the influence of minimum reinforcement on the cracking behaviour of prestressed concrete structures. It deals with the observation and modelling of the reclosing of cracks induced by a permanent compressive stress due to prestressing. A computerised proposed model allows to determine steel-to-concrete slip, bond stress, concrete stress and steel stress along the transmissio...
An irregular lattice model is proposed for simulating quasistatic fracture in softening materials. Lattice elements are defined on the edges of a Delaunay tessellation of the medium. The dual sVoronoid tessellation is used to scale the elemental stiffness terms in a manner that renders the lattice elastically homogeneous. This property enables the accurate modeling of heterogeneity, as demonstr...
This work applies machine learning to holistically interrogate the influence of metallurgical factors, such as chemical composition, heat treatment, and mechanical properties, on stress corrosion cracking resistance corrosion-resistant alloys. Particularly, we explored effect nickel in reducing susceptibility boiling magnesium chloride, arguably a controversial topic since Copson’s 1959 seminal...
Abstract In the 1940’s, a reinforced concrete (RC) railway bridge located in central Johannesburg was constructed using Witwatersrand Quartzite, at time, unknown to be an alkali-silica reactive aggregate. The currently displays signs of distress form severe map-cracking. This study presents preliminary results series tests that have been conducted characterise severity alkali silica reaction (A...
Abstract Simulation of heavy oil thermal cracking process is very important but few researches have been published now. In this paper, a simulation framework based on the carbon number-based approach(CNCA) has been established. A systematic division rule is put forward for dividing cracked products into 59 carbon number components. Then the cracking reaction network has been structured and the ...
The use of fibers in Reinforced Concrete (RC) elements changes their cracking pattern, leading to narrower and more closely spaced cracks. In addition, the presence can improve steel-to-concrete bond behavior reducing interface damage after cracking. Cracks work like paths, for aggressive agents, reach rebar elements, initiation period corrosion process, favoring at intersection between cracks ...
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