Results 211 to 220 of about 733,905 (265)

Strengths and weaknesses of long-term bioassays

Regulatory Toxicology and Pharmacology, 1987
The long-term bioassay for carcinogenic potential is a valuable tool for assessing human hazard, but suffers from severe limitations. Some of these follow directly from the use of animals as surrogates for man; others are created by study design and interpretations.
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Long Term Strength of Structural Adhesive Joints

The Journal of Adhesion, 1972
Abstract The long term static strength of adhesive joints is analyzed in terms of a modified Prot method and sustained load tests. Data from the failure times under different loading rates are used to predict the static stress that an adhesive joint will withstand for an infinite time, i.e., the endurance limit.
Armand F. Lewis, Raymond A. Kinmonth, Robert P. Kreahling   +2 more
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Creep and Long-Term Strength of Structures

2020
The issue of evaluating strength and service life is discussed as applied to structures performance of which is characterized by multi-parametric nonstationary thermal-mechanical effects. The major degradation mechanisms of structural materials are considered. In the framework of mechanics of damaged media, a mathematical model describing the processes
Ivan Volkov, Leonid Igumnov, Svetlana Litvinchuk   +2 more
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Long-Term Strength Development of Controlled Low-Strength Material

ACI Materials Journal, 2002
This paper presents results of an experimental study conducted to evaluate the combined effects of prolonged mixing time, late water inclusion, and variations in total water content on the long-term compressive strength of controlled low-strength material (CLSM). Long-term strengths refer to strengths measured after 600 days of curing.
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Diffusion locking effect on long-term strength

Moscow University Mechanics Bulletin, 2014
The diffusion locking effect on the long-term strength of metals is studied in the case of aggressive media. In order to model this effect, the diffusion equation with a variable diffusion coefficient is solved approximately. It is shown that, when determining the long-term strength of metals in aggressive media, it is necessary to take into account ...
A. M. Lokoshchenko, D. A. Kulagin
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Long‐Term Strength Development of Pavement Concretes

Journal of Materials in Civil Engineering, 1994
Development of pavement concrete compressive strength, flexural strength, and splitting tensile strength as a function of time is discussed. Eighteen sets of post‐1985 exerimental data from academic and industrial sources were selected to form a database of strength data for “modern” pavement concrete.
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Assessment of Long-Term Strength of Rocks

Key Engineering Materials, 2017
In relation to extraction of coal seams at significant depths, the issue of protection of safety equipment against pressure exerted by rock becomes very important. In many surveys of the effects of pressure exerted by rock it was demonstrated that the intensity of stress around the mine works increases the greater the depth of the mine works.
Alexander N. Kravcov, Pavel Svoboda, Vaclav Pospíchal, Dmitry V. Morozov, Pavel N. Ivanov   +4 more
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Long-Term Strength Estimation of Zirconia Ceramics

Proceedings of Higher Educational Institutions. Маchine Building, 2020
A standard experimental assessment of the service life of high-temperature zirconia ceramics (GOST 4070–2014) requires the use of complicated heating and measuring equipment and hundreds of expensive specimens. This necessitates the development of calculation methods for evaluating long-term strength depending on the thermomechanical loading conditions
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Long-Term Strength and Damage Analysis of Laminated Composites

AIAA Journal, 1997
A modified version of the probabilistic model for damage evolution analysis of laminates subjected to random loading is utilized to predict long-term strength of laminates. The model assumes that each ply in a laminate consists of a large number of mesovolumes.
Dzenis, Yuris A., Joshi, Shiv P.
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Long Term Strength Gain of Controlled Low-Strength Materials

1998
Controlled low-strength material (CLSM) is commonly used as a backfill in utility trenches and other applications. The fill must gain sufficient strength to allow for early repaying and support traffic loads. However, the ultimate strength of the fill material must not exceed 50 to 200 psi (0.344 to 1.38 MPa) to allow for re-excavation of the trench ...
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