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A Failure Criterion for Cracked Rock Mass under Seepage Pressure and Confining Pressure Biyong Li , Zheming Zhu *, Zhangtao Zhou College of Architecture and Environment, Sichuan University, Chengdu, 610065，China *corresponding author: zhemingzhu@hotmail.com Keywords: boundary collocation method; seepage pressure; friction; failure criterion Abstract: The existence of water affects the mechanical properties of cracked rock mass.
The liquid affects the mechanical properties of cracked rock mass, and consequently, they will affect the stability of underground structures.
For the oblique crack, the only SIF that appears at the crack tip is the Mode II factor KII, which can be written as
Conclusions The theoretical analysis and numerical calculations through the boundary collocation method show that seepage pressure affects the crack tip stress intensity factor significantly.
This new criterion is simpler than the traditional fracture criterion for which we have to calculate crack tip stress intensity factor.

Resin mineral composite (RMC) reinforced by fibers belongs to a multiphase material, whose mechanical strength depends on its material properties of components and microstructure characteristics of fibers including surface state, shape, and so on.
As the most fundamental factor to affect mechanical performance, bonding property is also one of the main elements to influence the reinforced effect of fiber on RMC.
Therefore, bonding property of fiber-matrix interface is the key factor to influence macroscopical performance of composite.
By interface shear transfer, fiber and matrix both sustain forces to achieve fiber-reinforced effect [4], thereby improving the mechanical properties of RMC.
Surface activity of reinforcing fiber largely depends on many factors including surface energy, type and quantity of reactive functional groups, microcrystalline structure, etc.

The results show that: The function of fly ash to the MPC is as followed: physical fill, superplastic and chemical reactions; the optimal content of fly ash is about 30% by weight, and MPC with 30% fly ash has excellent mechanical property and high fluidity; the fineness of magnesia affected the mechanical properties of MPC.
In China, Jiang et al [5] discussed the affecting factors of MPC’s properties based on rhe setting time, strength, interfacial bond properties with old concrete and hydration kinetics theory.
The durability and the properties of MPC based-materials as repair material were studied systematically by Yang [6,7] and Wang et al [8,9], meanwhile, they also studid the factors influencing on setting time and the mechanical property of MPC, and the experiments in real-world documents are very promising.
But at the same time, as a chemical bonded cement material, the high cost problem of the raw materials of MPC is the most important limiting factors affecting the applications.
Microstructure and mechanical properties of mortars made from magnesia-phosphate cement[J].

The Factors That Affect the Function of Dye-Sensitized Solar Cell Huiwen Liu 1 a, Xiaowei Feng 1 b , Fei Hu 1 c,Hua Zhu1d,Peng Xing1e 1 College of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen ,China 333403; a email: Leon41004@126.com, b email: fxwfxy@163.com , c email: mfhufei@126.com , d email: zwchua@163.com,e email:woshixingpeng@163.com Keywords: dye-sensitized solar cell, function of solar cell, influence Abstract.
Fill factors are the important parameters of characterized solar cell’s output characteristics, besides, the bigger the fill factors are, the better it’s output performance will be.
Carbon electrode is of good absorption properties and low costs.
Optical properties of nano-structured dye-sensitized solar cells.
Synthesis and photocatalytic properties of layered HNbWO6/(Pt，Cd0.8Zn0.2S)nanocomposites[J].

Mechanical, dynamic mechanical and shape recovery tests were carried out to show the properties of the composite materials and structures.
Results confirm the ability of this class of materials to easily change their shape without affecting the mechanical stiffness of the recovered structures.
Introduction Shape memory composites (SMCs) are attractive materials as they combine typical mechanical and functional properties of composites with shape memory properties.
Dynamic mechanical analysis (DMA) has been used to investigate visco-elastic properties of a SMC samples.
In order to increase mechanical properties of SMCs, parts without reinforcing fibers should be avoided.

Evolution characteristic of soil physical properties is that soil water content, bulk density and porosity made a response to mining subsidence, and soil moisture content variation was much more obvious and affected by seasonal weather.
All the affected indexes of chemical properties did not recover to initial level before mining in one year.
Changes of soil physical and chemical properties in coal mining subsidence land is formed by the ground movement and deformation and cracks and other factors, so the monitoring of soil physical and chemical properties should fully considered the distribution law of surface movement and crack.
Surface non-uniform subsidence, crack sand other factors had led to changes in soil structure in the early days of mining disturbance.
Soil cracks remains the primary factor affecting soil water content, the greater the fracture density, the larger the area of soil water evaporation, the faster the water loss.

Four factors have been listed: the effect of improper structure design and installation, the effect of quality of filter bag and poor filter cages.
According to the understanding, dust filter bag prone to the impact of the factors: At first, the filter bag products quality processing are particularly important.
According to the dust we choose the suitable properties of its filter material, so that the filter bag can normal adsorption dust, and do not affect its service life.
The type of cage used will affect the life of the filter bags.
Herein, four common factors causing the filter bag damage are concluded: i) The diameter difference between the filter bags and the cage is very importance.

*ajuniorfiori@gmail.com, braquelpiletti@gmail.com, cjackson_ilha@hotmail.com, dmicheli.pierini@hotmail.com, ehumberto.riella@ufsc.br, fmarciofiori@gmail.com Keywords: PVC pipes mechanical properties.
Abstract: This study evaluated the effects of temperature and speed screw rotation of rigid recycled PVC pipe extrusion process on mechanical properties and dimensional variation.
The results indicates the matrix temperature variation do not affect significantly the impact resistance property.
The significance tests indicate that none of the factors analyzed showed significant effects on the tensile strength of the PVC pipe.
Nielsen: Mechanical Properties of Polymers and Composites.

This paper focuses on the effect of thermal cycling on the mechanical properties of car clutch facings.
In this paper we will concentrate on the mechanical properties in the radial direction.
The mechanical properties were then measured after 6, 25, 50, 75 and 100 cycles.
Thermal cycles Effect on the mechanical properties.
Evolution of the thermo-mechanical properties after 100 cycles.

Microstructure and Mechanical Properties of ULCB Steels affected by advanced TMCP Technology Ziyong HOU1, a, *, Yunbo XU1, b, Di WU1, c, Wei-hua SUN 2, She-e HU 2 and Guodong WANG1, d 1State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, Liaoning Province, 110819, CHINA 2Technical Center, Jinan Iron and Steel Group Company, Jinan 117000, CHINA, a,*houzy525406@163.com, bxuyunbo@mail.neu.edu.cn, cwudi@mail.neu.edu.cn, dwanggd@mail.neu.edu.cn   Keywords: microstructure; ultra-high strength and toughness; advanced TMCP Technology; ULCB Steels.
Microstructural evolution and mechanical properties of this steel during hot-working have been investigated.
Results and Discussion Mechanical Properties.
(a) (b) 20μm (c) (d) 20μm Fig5 Optical microstructure of tested steels variation with processing conditions (a) route A1; (b) route A2; (c) route B1; (d) route B2 As well known, the mechanical properties of multiphase steels are based on several factors such as the morphology, properties and volume fraction of the constituent phases [12,13].
Multiphase microstructures allow to improve these latter properties [13].