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Testing of Undrained Shear Strength in a Hollow Cylinder Apparatus

.A., JARDINE R.J., Shear strength anisotropy of natural London Clay. Géotechnique, 2007, 57(1), 49-62. [10] ROLO R., The anisotropic stress-strain-strength behavior of brittle sediments, Ph.D. Thesis, Imperial College, London, 2003. [11] SAYAO A., VAID Y.P., A critical assessment of stress nonuniformities in hollow cylinder test specimens, Soils and Foundations, 1991, 31(1), 60-72. [12] WRZESIŃSKI G., LECHOWICZ Z., Influence of the rotation of principal stress directions on undrained shear strength, Annals of Warsaw University

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Shear Strength of the Selected Types of Pellets

Abstract

The usefulness of raw material obtained from oak leaves, waste from paper mass and fragments of Miscanthus was verified with regard to pellet production. A batch of pellets produced therefrom was subjected to technological shear tests with the use of prototype equipment. Also pellets produced by well-known Polish producers were tested. The suggested method of technological shear enables obtaining credible results through standardization of tests conditions. Statistical processing of results proved that there are significant differences in the values of shear strength and unit shear work obtained for both group of pellets. An experimental batch of pellets has a lower density and thus lower shear strength which limits the scope of industrial application. The research which was carried out proved that there is a strong correlation between mechanical strength and density.

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On the Areospace-Grade Adhesives Shear Strength Testing with ASTM D5656 Test as an Example

methods to measure the adhesive shear displacement in the thick adherend shear test”, Journ. Of Adhesion Science and Technology, No. 22, pp. 15-29. [9] ASTM D1002, 2010, “Standard test method for apparent shear strength of single-lap joint adhesively bonded metal specimens by tension loading (metal-to-metal)” ASTM International, West Conshohocken, PA, DOI: 10.1520/D1002-10. [10] Wiśniowski W., 2014, „XX lat Programu Samolotów Lekkich i Bezpieczeństwa. PSLiB” („Twenty Years of Light Aircraft and Safety Program”), Transactions of the Institute of Aviation, Vol

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A note on the differences between Drucker-Prager and Mohr-Coulomb shear strength criteria

1 Introduction In soil and rock mechanics, the Mohr-Coulomb (MC) shear strength criterion, along with its parameters, namely friction angle and cohesion, is treated as a kind of standard and reference concept for other shear strength criteria. This is due to the fact, that it fits well the experimental data, where asymmetric strength response in triaxial compression (TXC) and triaxial extension (TXE) tests is observed. Moreover, the MC criterion parameters have clear engineering interpretation and they are typically obtained in most geotechnical

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Assessment of Shear Strength in Silty Soils

Abstract

The article presents a comparison of shear strength values in silty soils from the area of Poznań, determined based on selected Nkt values recommended in literature, with values of shear strength established on the basis of Nkt values recommended by the author. Analysed silty soils are characterized by the carbonate cementation zone, which made it possible to compare selected empirical coefficients both in normally consolidated and overconsolidated soils

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Shear Strength of Conductive Adhesive Joints on Rigid and Flexible Substrates Depending on Adhesive Quantity

Thermal Aging on the Reliability of Electrically Conductive Adhesives, 2011 IEEE 17th Int. Symp. Des. Technol. Electron. Packag., 2011, pp. 305-308. [7] WICKHAM, M.-ZOU, L.-HUNT, C. : Measuring the Ef- fect of Substrate and Component Finishes on the Reliability of Isotropic Electrically Conductive Adhesive Joints, Solder. Surf. Mt. Technol. 21 No. 4 (Sep 2009), 12-18. [8] PODZEMSKY, J.-URBANEK, J.-DUSEK, K. : Shear Strength of Joints Made of Lead-Free Solders, in Proceedings of the 2011 34th International Spring Seminar on Electronics

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The improved design method of shear strength of reinforced concrete beams without transverse reinforcement

Abstract

In this article, results of experimental testing of reinforced concrete beams without transverse shear reinforcement are given. Three prototypes for improved testing methods were tested. The testing variable parameter was the shear span to the effective depth ratio. In the result of the tests we noticed that bearing capacity of RC beams is increased with the decreasing shear span to the effective depth ratio. The design method according to current codes was applied to test samples and it showed a significant discrepancy results. Than we proposed the improved design method using the adjusted value of shear strength of concrete CRd,c. The results obtained by the improved design method showed satisfactory reproducibility.

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Performance of a Micro/Nano Wedge-Platform Thrust Slider Bearing Based on the Limiting Shear Strength Model

Abstract

This paper presents an analysis for a micro/nano wedge-platform thrust slider bearing by using the flow factor approach model. The contact-fluid interfacial shear strength was taken into account for describing the inter-facial slippage. The carried load and friction coefficient of the bearing were calculated when different contact-fluid interactions were used. It was found that the interaction strength between the contact and the fluid has a significant contribution to the load-carrying capacity of the bearing, a weak contact-fluid interaction in the bearing inlet zone and its resulting interfacial slippage on the stationary contact surface is beneficial for both the load-carrying capacity and the friction coefficient of the bearing, while a strong contact-fluid interaction in the bearing outlet zone is contrarily harmful. The relative slip amount is linearly distributed in the bearing inlet zone, when the interfacial slippage occurs on the stationary surface in this subzone because of the low interfacial shear strength.

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Quantitative Analysis of the Relationship Between Shear Strength and Fractal Dimension of Solidified Dredger Fill with Different Fly Ash Content Under Monotonic Shear

Abstract

The dredger fill of Shanghai Hengsha Island Dongtan is solidified by curing agents with different fly ash content, and the shear strength index of solidified dredger fill is measured by the direct shear test. The microscopic images of solidified dredger fill are obtained by using SEM. The microscopic images are processed and analyzed by using IPP, and the fractal dimension including particle size fractal dimension Dps, aperture fractal dimension Dbs and particle surface fractal dimension Dpr is calculated by fractal theory. The quantitative analysis of the relationship between shear strength index and fractal dimension of solidified dredger fill is done. The research results show that the internal friction angle and the cohesion are closely related to the fly ash content λ and the curing period T, and the addition of fly ash can improve the effect of curing agent; There is no obvious linear relationship between the internal friction angle and the three fractal dimensions; The smaller particle surface fractal dimension Dpr and particle size fractal dimension Dps, the larger aperture fractal dimension Dbs, the greater the cohesion, and the cohesion has a good linear relationship with three fractal dimensions, and the correlation coefficient R2 is above 0.91.

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X-Ray Microtomography (μCT) as a Useful Tool for Visualization and Interpretation of Shear Strength Test Results

Abstract

The paper demonstrates the applicability of X-ray microtomography (ìCT) to analysis of the results of shear strength examinations of clayey soils. The method of X-ray three-dimensional imaging offers new possibilities in soil testing. The work focuses on a non-destructive method of evaluation of specimen quality used in shear tests and mechanical behavior of soil. The paper presents the results of examination of 4 selected clayey soils. Specimens prepared for the triaxial test have been scanned using ìCT before and after the triaxial compression tests. The shear strength parameters of the soils have been estimated. Changes in soil structure caused by compression and shear failure have been presented as visualizations of the samples tested. This allowed for improved interpretation and evaluation of soil strength parameters and recognition of pre-existing fissures and the exact mode of failure. Basic geometrical parameters have been determined for selected cross-sections of specimens after failure. The test results indicate the utility of the method applied in soil testing.

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