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The nature of the effect of microcrystalline cotton cellulose on the change in the physical and mechanical properties of the gypsum-particle composite using cavitation-treated sawdust was revealed and its optimal dosage was determined.
The subject of the study is the structure and properties of wood composites from waste.
The physical and mechanical properties of a heat-insulating gypsum-particle composite using high-strength molding gypsum of the G-16 brand modified with microcrystalline cotton cellulose are investigated.
The levels and intervals of variation of variable factors are shown in Table 1.
Levels and intervals of variation of variable factors.

The results showed that both feed rate and depth of cut have a little effect on the value of three-dimensional roughness parameter, and the cutting speed is the main affecting factor.
Introduction Mechanical and physical properties of particle reinforced metal matrix composites such as high specific strength, stiffness and wear resistance indicate that these materials play an important role in application for aerospace and automotive engineering components.
The factors and levels of cutting parameters were shown in Table 2.
It can be found from Fig. 2 that the cutting speed is the dominant factor affecting the surface roughness in terms of value of range.
Table 2 Factors and levels of cutting parameters Factors Levels 1 2 3 A: fz（mm/z） 0.01 0.05 0.1 B: Vc（m/min） 150 300 450 C :ap（mm） 0.01 0.05 0.1 Fig. 2 Main effects plot of cutting parameters Summary In this study, three-dimensional roughness Sq was investigated and its calculated method was proposed.

The complex stress intensity factor and the T-stress characterizing the stress state at the crack tip are calculated both for the thermal (residual stresses) and mechanical loading using the two-state integral.
However, if higher order terms of the asymptotic expansion are needed because the fracture process is not confined well within the boundary of the K-dominant field, then under the combined influence of mechanical loading and thermal stresses the criterion evolves from a local formulation (i.e. depending only on local properties around the primary crack tip) to non-local one in which the geometry of the whole body plays a role.
Scheme of the analysed four-point bending specimen, detail of the deformed FE mesh and considered orthotropic material properties of both layers.
Elastic properties of the layers M1 and M2 possess the tetragonal symmetry with elastic modulus Ex=Ez=E in the direction of x and z axis and elastic moduli Ey=E’.
The energy release rate G: (a) for the case of pure mechanical loading (b) for the case of the combined (thermal and mechanical) loading.

The mechanical properties of new material may have capability to be further process as thermoplastic elastomer.
The mechanical properties were determined at 100 and 300 % elongation.
The comparison on the mechanical properties of conventional floor mat and starch TPE at 100 and 300 % elongation is shown in Table 2.
There were various kinds of environment factors that cause the increment of VOCs, such as temperature, humidity and airflow velocity [22].Comparison on the VOCs released Starch TPE and floor mate was done.
In this study, it was found that temperature was the main factor that affected the concentration of VOCs.

The paper contains results of an experimental evaluation of fatigue properties of two steel types used for shaft manufacture, namely rather conventional, medium carbon high quality C45+C steel and quite modern low alloy ETGâ88 steel, recently developed with the aim to reduce overall manufacture cycle costs together with maintenance of high mechanical and fatigue properties.
Besides fatigue tests, experimental programme contained an evaluation of (i) chemical composition, microstructure and material purity, (ii) mechanical properties and (iii) resistance to brittle fracture – notch impact toughness.
This fact probably affected fatigue properties, fatigue crack initiation mode and also notch impact toughness.
§ Mechanical properties of ETGâ88 steel are higher in comparison with those of C45+C steel
§ Fatigue strength of ETGâ88 steel is very good, approximately by 20% higher than that of C45+C steel, the difference being even more significant than the difference between static mechanical properties.

Influence of Metakaolin, Fly Ash and Nano Silica on Mechanical and Durability Properties of Concrete Rabinder Kumar1, a, Airil Yasreen B.
Addition of small amount of NS can produce stable gel and results improved mechanical properties of hardened cement paste [9].
Lot of factors are involved which can affect directly on concrete strength, i.e. ingredients used in concrete, age ratio of water cementitious materials, etc.
Ann, Factors influencing chloride transport in concrete structures exposed to marine environments, Cem.
Riahi, The effects of SiO2 nanoparticles on physical and mechanical properties of high strength compacting concrete, Comp.

Introduction The fiber cement based composites is a material obtained from a series of physical-chemical reaction of cement and other mineral admixture after adding water, having certain mechanical strength, and integrity is a prerequisite to ensure its mechanical properties[1~2].
Bonding properties between fiber and cement is foundation for fibers.
This is mainly because the limits of the polypropylene fibers, which have the properties of short, fine and soft.
A study of the mechanical properties of short natural-fiber reinforces composites [J].
A study of factors affecting the fiber-matrix bond in steel fiber reinforced concrete [J].

Anqing Copper Mine’s Study on CRF mechanical properties is the foundation of CRF technology.
The present study on CRF investigates the basic mechanics of cemented rock–tailings filling, primarily the physical and mechanical characteristics of waste rock and tailings, computing and determining the functional relation of CRF strength and influencing factors.
The mechanical intensity law and the extent of the influence of cemented rock–tailings filling on interrelated factors are revealed to provide an important reference for the optimum design of the mix proportions of CRF material.
The aggregate properties of cemented rock–tailings filling directly affect the quality of the mine-filling body and filling cost.
The physical, chemical and mechanical properties were determined in tests that provide the basis for the mechanics experiments on cemented waste rock–tailings filling.

Previous Raman analysis of the SiC-layers and measured resonant frequencies and quality factors of the processed MEMS show a dependence on the Ge amount at the interface of the Si/SiC heterostructure, which allows to adjust the MEMS properties to the requirements needed for certain applications.
Thus, other factors have to be taken into account to explain the observed behavior.
The second group of factors, the defects densities, affects the quality factor in two ways.
Secondly, an improved material quality may change the elastic properties of the SiC.
The results of the rf measurements show that the properties of the MEMS structures were not only affected by a manipulation of the residual strain due to the Ge precoverage.

Taking the effect of geometric errors on machining accuracy into consideration in the design of small precision machine tools, the thermal errors become the main factor affecting the machining accuracy of machine tools.
So, thermal error will be the major factor that affects component accuracy.
Also, to control the error that caused by thermal deformation will be part of the key factors to improve machining accuracy of machine tools.
Intellectual Property Publishing House, 2008: 10:22
Mechanical Engineering,2012 (05)