Search results

Influence of Vibration on Interface Friction of Pile-soil System Xiaopeng Li a, Tao Li b , Zeliang Duan c and Bangchun Wen d School of Mechanical Engineering & Automation, Northeastern University, Shenyang, Liaoning, 110004, China axpli@me.neu.edu.cn, blitao4079@163.com, cduanzeliang0627@163.com, dbcwen1930@sina.com Keywords: vibration friction, friction coefficient, pile-soil system, interface Abstract.
Introduction Interface friction can be affected by many factors, such as load, surface oxide film, material properties, sliding speed, temperature, the condition of friction pair, and so on.
In recent years, people have realized that vibration can affect the friction directly or indirectly, but can’t study its principle adequately.
Some theory discussed that vibration could change material properties and friction coefficient of objects, but this theory was based on hypothesis and there were no adequate basis [1,2].
Acknowledgements This work was financially supported by National Natural Science Foundation of China (50805020), Opening Project of State Key Laboratory of Mechanical System and Vibration (MSV-2010-17), and the Fundamental Research Funds for the Central Universities (N090403004).

Moreover, it had also affected by physic factors, namely bulk density, fiber size thickness, porosity, airflow resistivity, tortuosity, and air gap spacing [4].
The samples coding and properties of composites were detailed in Table 1.
Seddeq, “Factors Influencing Acoustic Performance of Sound Absorptive Materials,” Aust.
Arnaud, “Acoustical properties of materials made of vegetable particles with several scales of porosity,” Appl.
Ren, “Study on sound absorption property of ramie fiber reinforced poly (l-lactic acid) composites: Morphology and properties,” Compos.

This study aims to evaluate the properties of particleboard made from chemically modified oil palm biomass and to determine the effect of pressing temperature on the properties of the particleboard.
The moisture content in the particleboard differs in each sample due to various factors such as processing parameters and the original moisture content of the raw materials.
This test shows that particleboards made using high temperature have higher mechanical strength properties than particleboards made using a lower temperature.
Ross, "Mechanical Properties of Wood-Based Composite Materials," in Wood handbook—Wood as an engineering material, Forest Product Laboratory, Ed.
Kretschmann, "Mechanical Properties of Wood," in Wood Handbook - Wood as an Engineering Material, F.

Consequently, it improved physical and mechanical properties of the binderless particleboard produced.
Consequently, it improved physical and mechanical properties of the binderless particleboard produced.
Effect of Pretreatment Condition on Physical and Mechanical Properties of Panels.
The improved MOR, IB and WA values could be related to the above mentioned factors.
Liquid hot water pretreatment conditions have a significant influence on the physical and mechanical properties of the binderless panels.

Current collection performance is one of the key factors of railway speed-up.
The WVD has better time-frequency resolution than the STFT, but despite its remarkable properties, WVD has limited applications because it contains interference terms.
The Gabor shaping factor affects the time-frequency localization of the GWT.
Finally, the optimal Gabor shaping factors of the signals were found to be 4.2 and 4.9, respectively.
As expected, the optimal Gabor shaping factors were less than 4.2 or 4.9.

Some of these compounds include nitrate [1], limestone and anhydrite [2, 3], sulfate and sulfate–chloride [4].The rheological properties of concrete could also be affected because these chemical compounds or impurities in the water might affect the ease of placement and consolidation, thereby causing entrapment of air voids and aggregate segregation.
Although, if the contamination level of the water is within acceptable limits, such water is not expected to affect concrete properties [5].
The physical properties of the aggregates are shown in Table 1.
The procedures for determination of the material properties followed those of the following studies [11–14].
This may be a result of rapid cement hydration or partly be attributed to the presence of minimal impurities in the water sample, amongst other factors like compaction and placement. 4.

So the theoretical model of water-jet guided laser machining cotains thermal physics, fluid dynamics, interaction of laser and water-jet to material, the varying thermo-physical and mechanical properties of material.
The convection heat transfer should affect the entire surface of model and the coefficient was calculated by hf =Nuλ/l, Nu was obtained from a review article [5].
(3) To exert machanical effects on the workpiece with different mechanical properties result from the influence of temperature gradient.
In order to more clearly reflect the process of cooling, several points from high temperature to low temperature along the arrow direction shown in the Fig.6-a) were selected to draw a set of time-temperature curves just as illustrated as Fig.7, it can be seen that the points temperature were declined only about 1ms, the rapid water jet cooling resulted in a quenching effect, which enhanced the mechanical properties in the processing area and also was able to be apply to adjust the pulse spacing more reasonable in accordance with the cooling time.
The rapid cooling of the water jet to high temperature hole wall after every laser pulse results in a quenching effect, which enhance the mechanical properties in the processing area and also can be apply to adjust the pulse spacing more reasonable in accordance with the cooling time.

The factor affecting its various properties was investigated and discussed.
This paper is concerned with the manufacturing process of the composite material [3] making the best use of its properties.
It is expected that the hybrid is widely used for building and construction materials and diverse applications, since those possess superior adiabatic property, good vibration absorption and preferable strength.
In the present study, the hybrid was successfully manufactured and therefore this paper described the manufacturing process and its properties. 2.
The hybrid preform was axially and transversely cut by mechanical saw in order to observe its soundness and morphology.

Although such a low water-cement ratio is the cause of incomplete hydration of all cement grains, its significant reduction affects the resulting mechanical parameters of composite, especially due to the prevention of micropores and capillaries creation that occur during the drainage of redundant water from a composite.
From the resulting mechanical parameters point of view, the most sensitive spot of composite, which is the transition zone between aggregate grains and cement stone, shows significantly better properties thanks to the strong reduction of the water-cement ratio.
High doses of binding agents, together with the significant reduction of the water-cement ratio, often cause the production of composite with unsuitable rheological properties.
OLEK, Influence of aggregate size, water cement ratio and age on the microstructure of the interfacial transition zone, Cement and Concrete Research, Volume 33, Issue 11, 2003, Pages 1837-1849, ISSN 0008-8846 [11] Factors Effecting Strength of Concrete. 
Available from: https://theconstructor.org/concrete/factors-affecting-strength-of-concrete/6220/ [12] EN 12350-2.

As a result of the study, the physical and chemical factors of the bacterial carbonate mineralization process intensification in quartz sand samples were established.
The type of bacterial culture that exhibits the most active cementing properties - Bacillus pumilus (VKM B-23).
The cement stone system is a complex multiphase poly structural system, the durability of which is determined by various factors.
Shredah, Application of microbial biocementation to improve the physico-mechanical properties of sandy soil, Construction and Building Materials. 190 (2018) 861–869
Li, Influence of molding process on mechanical properties of sandstone cemented by microbe cement, Construction and Building Materials. 28 (2012) 238–243