Search results

In order for these timbers to be used as structural and non-structural application, it is important to provide the information on the physical properties that affect the mechanical properties of timbers [1].
In structural and mechanical engineering perspective, the shear properties of a component is a crucial factor to look for in determining the dimensions and materials to be used in the manufacturing or even construction of the component.
Laminated Veneer Lumber Made From Tropical Forest Trees (Mechanical Properties).
Mechanical Properties Of Wood.
Structural timber-determination of characteristic values of mechanical properties and density.

In literature [4], the author focused on the 3D numerical prediction of tool wear in metal cutting operations. in their analytical model, the diffusive wear mechanism, heat transfer phenomena at the tool-chip interface and other effect factors were included.
In literature [7], Zro2-based composites with 40 vol. % WC were produced in order to derive correlations between materimal removal rate (MRR), surface finish, wire EDM parameters and material properties.
Ko-Ta Chiang in his paper told us that the main two significant factors on the value of the material removal rate (MRR) were the discharge current and the duty factor.
To a certain extent，the existence of surface affected layer has affected the service life of cutting tool, and has become the second important elements that affected cutting tool life besides the geometry size factor.
The workpiece material and technological parameter of electrical discharge machining influence the affected layer thickness and its physical mechanical property.

It was found that microstructural differences between surface and bulk of the samples affect their thermoelectric properties.
The final microstructure of ceramic materials depends on various factors such as properties of raw materials, sintering conditions as well as the shaping method used.
The shaping method can significantly affect development of microstructure during the sintering and hence the final properties of the sintered bodies [3].
It was found that these microstructural differences between the surface and bulk of the samples affect their thermoelectric properties.
Noudem, Texture, mechanical and thermoelectric properties of Ca3Co4O9 ceramic, J.

The effects of sintering temperature on the phase, the morphology and the mechanical properties of Ti-Mo alloys were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and mechanical properties test methods.
In the powder metallurgical process, sintering process are the main factors that influence the mechanical properties of Ti-20Mo alloy.
Mechanical properties.
The results indicate that when the sintering temperature is 1300 ℃, the Ti-20Mo alloy has better mechanical properties.
(2) The mechanical properties of Ti-20Mo alloy were affected by temperature.

The effects of hot-pressing temperature, hot-pressing pressure, and hot-pressing time on mechanical properties were studied through single factor analysis method at a certain thickness.
Silk/PE film with low melting point and good transparency, could guarantee the elegant appearance and good mechanical properties of silk fabric after compounding with PE.
If hot-pressing time was too short, the infiltration was incomplete, leading to imbalances in the local stress and then causing a decline of the whole mechanical properties.
If hot-pressing time was too long, the structures and properties of the silk fabrics could be destroyed under high temperature and high pressure, therefore the mechanical properties of decorative composites could presented downtrend.
Fig.4 Effect of time on the mechanical Fig.5 Effect of pressure on the mechanical properties of decorative composites properties of decorative composites Hot-pressing Pressure.

The knowledge of the decay processes, as well as mechanisms governing these processes, and the real effect of factors depending on the intrinsic properties of the material to be studied, and external agents of decay, will allow a rationale use of these materials and to anticipate their behaviour beforehand, in order to success in restoration.
We then need to understand the factors of decay.
Stone materials decay Alteration processes of building stone materials depends, on one hand, of intrinsic factors on the material itself (Table 1) like the composition and internal architecture (texture and structure), on the other hand, of extrinsic factors (Table 1) like the environmental conditions (climatic and pollution) where the monument is located, and even the microclimate affecting a particular stone in the building [5-7].
Protection, one of the properties that have been most sought in surface coatings is water repellence.
Inorganic products are consolidants; they show chemical, physical and structural affinity to stone, weak improvement of mechanical properties and low penetration ability, and they are fragile and non elastic.

The results show that crack orientations and the load conditions of tunnel affect stress intensity factors significantly.
It is a nondestructive, whole-field, graphic stress-analysis technique based on an optical mechanical property called birefringence, possessed by many transparent polymers.
The method relies on the birefringence property exhibited by transparent plastics [13, 14].
The fringes of the principal stress difference and the corresponding stress intensity factors (SIF) near the crack tip A under uniaxial compression are shown in Fig.3.
The fringes of the principal stress difference and the corresponding stress intensity factors (SIF) at crack tip A are shown in Fig. 4.

Analysis of Factors Affecting the Direction of Plastic Strain Increment in Sand Yunpeng Guo1a, Chengzhi Qib, Chao Ma1c, Zhenhui Lu1 and Youjie Sun1d School of Civil and Transportation Engineering, Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China a1551916438@qq.com, bqichengzhi65@163.com Keywords: plastic strain increment direction, stress increment direction, stress state Abstract: Taking the standard sand of Fujian as the test material, this paper concentrates on studying the influence of different stress increment directions on the direction of plastic strain increment of sand materials under different stress states and the underlying mechanism.
Introduction Sand is a common granular medium material, which we have to treat with in engineering practice, and its mechanical properties have always been one of the key topics in geotechnical engineering research.
Thisindicates that under condition of working condition4 of initial stress, forthe same stress increment direction angle chang in this region, the plastic strain increment direction angle change range is larger than in the other two regions. 3 Analysis of Factors Affecting Plastic Flow Direction 3.1 Effect of stress increment We again use the results of test of working condition 4 as an example, and contruct the stress ratio-plastic shear strain curve, stress ratio-plastic volume change curve in the directions 0°, 90°, and 180°, respectively.
(in Chinese) [6] Lai Yong, Studying of sands constitutvie model that including the influencing factor of stress path at small strain[D], Nanjing: Hohai University, 2005.
(in Chinese) [17] Huang Maosong, Yao Yangping, Yin Zhenyu, Liu Enlong, Lei Huayang, An overview on elementary mechanical behaviors, constitutive modeling and failure criterion of soils[J], China Civil Engineering Journal. 49 (7) (2016) 9-35.

The observation of crack initiation and fracture behavior reveals that the biaxial stresses have strong influence on the fracture properties of glass.
It is confirmed that the tensile stress parallel to the crack plane is an important factor affecting crack arrest, while the compressive stress parallel to the crack plane contributes to crack opening.
Numerical Model In MFPA 2D , the solid or structure is assumed to be composed of many elements with the small and fixed size, and the mechanical properties of these elements are assumed to conform to a given Weibull statistical distribution as defined in the following: ( ) m m u u u u u m uf      −      = − 0 1 00 exp (2) where u is the parameter of element properties (such as strength or elastic modulus); the scale parameter u0 is related to the average of element parameter and the shape parameter m defines the shape of the distribution function.
Table 1 gives the stress intensity factors for crack initiation and stress intensity factor for unstable crack propagation under different stress states.
This result again shows that the stress parallel to the crack has significant influence on the stress intensity factors in the crack tips.

The 22 factorial design was used with two factors Lf and Nc , two levels and a midpoint.
Influence of cycles on mechanical properties of treated fiber and natural fiber Figure 10.
The variation of thickness and the curvature of the level curves show that there is a high interaction among the factors.
A study of the mechanical properties of short natural-fiber reinforced composites.
A study of the mechanical properties of short natural-fiber reinforced composites.