Search results

Cores from both HMA and WMA sections were retrieved periodically to characterize their mixture mechanical properties.
The specimen were used to investigate the mixture mechanical properties as well as binder rheological property.
Results and Discussion Mixture Mechanical Properties.
In addition, analysis of variance (ANOVA) at a level of significance of α=0.05 was used to analyze which factors (binder type and age) significantly affect the measured resilient modulus.
Statically, both binder type and mix age were found out to be the significant factors for the results of ITS.

Analysis on influencing factors of dynamic variations of CBM reservoir permeability during exploration process During the exploration of CBM depletion, physical properties of coal reservoirs are affected by many factors which are dynamic.
When reservoir pressure is reduced from 7MPa to the critical desorption pressure 3.8MPa and the porosity and permeability is gradually reduced, physical properties are continually deteriorated; when the critical desorption pressure is reduced from 3.8MPa to 2.5MPa, physical properties begin to increase until getting to the initial state; when pressure is reduced to abandonment pressure, physical properties are improved, and the final porosity is increased to 50%, and permeability is increased by 1.8 times.
Therefore, physical properties of reservoirs in the later period of Qinshui CBM Field exploration are improved with satisfactory gas generation conditions.
The initial gas saturation is an important factor that affects permeability variation during CBM depletion, as shown in Fig.5.
Conclusion (1) There are many influencing factors during the process of CBM exploration, physical properties of coal reservoirs are dynamically changed.

The thermal stability of the composites was influenced by three main factors, and the total effect of the three factors on thermal stability illustrated a negative trend. 1.
The thermal stability of the composites were affected by three main factors, and the total effect of the three factors on thermal stability illustrates a negative trend.
Multiscale modeling and mechanical properties of zigzag CNT and triple-layer graphene sheet based on Atomic Finite Element Method.
Improving the mechanical properties of graphene oxide based materials by covalent attachment of polymer chains.
High performance polyurethane/ functionalized graphene nanocomposites with improved mechanical and thermal properties.

Currently for the restoration of worn functional surfaces or the production of surfaces with properties exceeding the properties of base material often the processes of arc welding are used.
In the paper there is a choice of particular components presented, surfaces of which are worn by the combination of various tribodegradation factors in the operation.
As the abrasive medium aluminum oxide was used (Fig.6), the physical properties of which are shown in Tab. 7.
Conclusions The paper presented options of the components renovation, surfaces of which are exposed in the operation to extreme tribodegradation factors.
From these factors the most common are abrasive-adhesive wear combined with impacts, high surface pressures as well as corrosion.

Problem such as wear and tear of PDC cutter are some of the main factors in drilling process failure affecting the rate of penetration (RoP).
There are several factors affecting rate of penetration but this research focus on rapid product development and changes to drill bit design for improvement in rate of penetration using reverse engineering approach.
Step of step for development of finite element analysis of PDC drill bit is as following: Define the properties of drill bit and formation in engineering data.
Table 2: Engineering Data for Analysis [9] Material Properties Limestone Density (2600 kg m^-3), Tensile ultimate strength (4.0e+06 Pa), Young’s Modulus (5.e+010 Pa), and Poisson’s Ratio (0.22).
Increasing number of cutters will decrease efficiency of cleaning hence affecting directly rate of penetration.

Study on Mechanical Property and Strength Formation Mechanism of Red- mud & Fly-ash Aerated Concrete Ruiyan Wang1, a, Lanfang Zhang1,b 1 Department of Material, Chongqing Jiaotong University, Chongqing,400074, China awangry@cqjtu.edu.cn, b yyzhanglf@163.com Keywords： Red Mud; Fly Ash; Aerated Concrete; Linear Relationship Abstract：Red mud is the waste which is generated in the process of extracting alumina from bauxite.
The ratio of powder and water effects on the aerated concrete is mainly manifested in two aspects: One direct impact on resultant microstructure of the hydration density, which impact on the pores wall strength; On the other hand, slurry consistency was significantly affected, thus affecting the bubble size and bubble spacing factor inside the paste, thereby affecting aerated meso pore structure and strength of aerated concrete.
Relationship between strength and influencing factors can be expressed as Eq. 1: f=-206.195+2.103602C+2.037753 RM+2.019476 FA+2.172341 AD-19.5346 Al+2.810023 P/W (1) （2）Strength of red mud ﹠ fly ash aerated concrete is mainly from calcium silicate hydrate gel and ettringite.
The two factors are very important to strength and density of aerated concrete（4）Aluminum powder content has direct impact on the porosity of aerated concrete, thus affecting the density and strength of aerated concrete

There are many factors influencing main structure of the tunnel concrete durability, mainly displays in the following aspects.
Material levels Material durability research mainly start from factors that influencing the durability of structure, and analyzes the failure mechanism under the action of single factor or more factors, to establish the durability damage prediction model and empirical formula, realize process from the qualitative analysis to quantitative analysis.
Structural concrete permeability of nondestructive testing Permeability is one of the basic properties of porous materials; it reflects the material internal pore size, quantity, distribution and connectivity and so on.
Wall height is the main factor affecting wall stress.
First it is necessary to develop a system to improve a set of strengthening quick test method，so to be able to compare objectively reflect the concrete destruction in the use of environmental factors and their cross composite factors, and to long-term exposure tests by each other.

Analysis of Influence Factors for the Contact Length between Wheel and Workpiece in Surface Grinding Cong Mao1,a , Zhixiong Zhou 1 , Dewang Zhou1 and Duyi Gu 1 1 College of Mechanical and Automotive Engineering, Hunan University, Changsha, China, 410082 a maocong315@yahoo.com.cn Keywords: Grinding process, Contact zone, Contact length, Influence factors Abstract.
It is found that the grinding conditions and the properties of work material have effects on the contact length, moreover, the mechanism of which is discussed in this paper.
Many factors have to be taken into account such as the deformations of the workpiece and the wheel caused by forces and heat, uneven distribution of the grains on the peripheral surface of the wheel, and dressing condition etc
In Fig.8, Ld, which is gr LL − , is the increment of contact length affected by grinding parameters excluding the cutting depth, such as maximum grinding temperature Tmax and grinding force.
It is expected that both the mechanical strength of the abrasive grains and the gripping strength of the bonding material of the wheel deteriorate.

The major shortcomings of those weight-saving materials are their poor mechanical properties and poor tribological performance, such as wear, friction and adhesion characteristics.
Model Description Model Description and Material Properties.
As for Al matrix, two stress intensity factors are calculated: one considers the crack length equals to the coating thickness while the radius of the Si particle is considered to be the crack length in the second scenario.
Regarding CrN, the stress intensity factors for different thicknesses fall just below the aluminum oxide as its fracture toughness is very close to that belongs to AL2O3 , and equal to 3.3 MPa√m [12].
He, Study on the structure and tribological properties of CrN coating by IBED, in: vol 131, Elsevier, Switzerland, 2000, pp. 391-394.

However, the relatively low mechanical properties of copper, such as low strength, low wear resistance cannot meet some special requirements, which limit its further applications [2].
In recent years, most studies mainly focus on graphene reinforced copper matrix composites to improve mechanical properties of the matrix [10-12].
Choi, Effect of processing route on mechanical and thermal properties of few-layered graphene (FLG)-reinforced copper matrix composites, Journal of Alloys and Compounds 754 (2018) 7-13
Seokwoo, Enhanced mechanical properties of graphene/copper nanocomposites using a molecular-level mixing process, Advanced Materials 25(46) (2013) 6724-6729
Xie, Highly enhanced mechanical properties in Cu matrix composites reinforced with graphene decorated metallic nanoparticles, Journal of Materials Science 49(10) (2014) 3725-3731