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The factors affecting the additional twists and final twists of the compact spun yarn, such as diameter of the fiber band in the compact field, tilting angle of suction slot in profile tube and spinning speed, were discussed in detail.
This technology has significantly improved yarn tensile properties and reduced yarn hairiness.
The phenomenon of twist increase was discussed in this paper, and the factors causing the differences in the two spinning methods were also investigated.
In this condition, twist angle can be the reflection of twist degree instead of twist factor.
Cheng: Mechanical and Kinematical Analysis on Fiber Brand of Compact Spinning System.

The Micro-Milling Machining of Pyrex Glass Using the Electrochemical Discharge Machining Process Lu Changjian1,a, Gu An1,b, Li Meng1,c and Yang shengyi1,d 1College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nan Jing, China Email: alcj151595@163.com, bguan1316@126.com, c573218823@qq.com, d675607656@qq.com Keywords: ECDM; Micro-Milling; Pyrex glass Abstract.
The ECDM technology and micro-milling technology were combined, and a milling platform was designed, through the analysis of the affecting factors in the processing, the Pyrex glass was machined by using the electrochemical discharge micro-milling machining and the experiment results were discussed.
MEMS played an increasingly important role in the modern industry, the variety of mechanical and electrical products towards the fine direction. 
Glass, ceramic, silicon and so on, due to their excellent properties, they were increasingly used in MEMS. 
Fig. 3 Micro-milling system Through the analysis of various factors in ECDM, the following parameters combination was used: Machining voltage was DC 28V, the working solution was 5% concentration NaOH solution, a tungsten rod electrode of 250μm diameter was used as tool electrode, feed speed of level table was 10μm /s, and the workpiece was Pyrex glass.

The Evaluation of the Effects of the Maximum Stress Intensity Factor for Fatigue Crack Opening Behavior by Finite Element Analysis Hyeon Chang Choi 1, a Hyeonki Choi2, b and Jun Hyub Park 1, c 1 Department of Mechatronics Engineering, Tongmyong University, Busan, Korea 2 School of Mechanical Engineering, Sungkyunkwan University, Suwon, Korea a hcchoi@tu.ac.kr, bhkchoi@skku.edu, cjhyubpark@korea.com Keywords: Finite Element Analysis; Crack Opening; Cyclic Crack Tip Opening Displacement; Reversed Plastic Zone Size; Maximum Stress Intensity Factor.
It is confirmed that the crack opening behavior depends upon the maximum stress intensity factor Kmax.
The results of the smaller element sizes indicate that the crack opening behavior has not an affect on the element size except that the element size is larger than the reversed plastic zone size [8, 9].
Material properties are shown in their papers.
We can confirm that the crack opening behavior depends upon the maximum stress intensity factor Kmax.

Stress intensity factors (SIF) presented in the paper were calculated numerically.
Upper and lower balls are immersed in lubricating oil (table 1 presents base properties of lubricating oil).
The upper ball is the silicon nitride test specimen with a pre-existing ring crack (table 2 presents silicon nitride properties).
Base lubricating oil properties Trade name T-9 Producer Nynas AB Properties: Kinematic viscosity (temp. 40°C) 9,13 [mm2/s] Kinematic viscosity (temp. 100°C) 2,3 [mm2/s] Sulfur content 0,01 % Flash point temperature 146°C Table 2.
Stolarski, Factors affecting the wear of ceramic balls, Wear 172 (1994) 191-196

Based on the consolidated drained shear triaxial tests, the mechanical properties of different proportion of CSG are studied on shear failure mode, stress-strain relationship, shear strength.
The mechanical properties of CSG is between that of earth rockfill materials and concrete[2].
However, the study on mechanical properties of CSG lags practical engineering obviously.
Meanwhile, by contrast, what cement affect the mechanical properties of cemented sand and gravel was analyzed.
The effect of cement, fiber, confining pressure and other factors were considered on the strength of cemented sand and gravel.

However, during long-term use, its appearance may be affected by varying degrees of color change, affecting the appearance and longevity of the dentures.
The color of denture base resins can be affected by many factors, including water absorption, dissolution of material components, pigment accumulation, intrinsic pigments and surface roughness [2-5].
The coloring of restorative materials is the result of both intrinsic and extrinsic factors. 
Extrinsic factors are mainly the attachment and adsorption of the colorant. 
Water is a plasticizer, and adsorbed water reduces the mechanical properties of the material, including hardness, tensile strength and flexural strength.

Motivated by high fracture incidence of this particular component, an extensive research program to evaluate the fabrication and maintenance weld repair effects on the structural integrity, mechanical properties and microstructural changes has been developed.
The mechanical properties obtained from smooth flat samples, in accordance with ASTM E 8M, were: 745.97 MPa for yielding stress (0.2% offset); 843.35 MPa for ultimate strength; 655.17 MPa for rupture stress; 9.80% for elongation (in 25 mm length), 0.88 for yielding stress/ultimate strength ratio and 65 HRA hardness in the "asreceived" condition.
Fig. 5 and Table 3 present the principal geometric factors that compose a butt-weld joint, measured by image analysis tool.
The AISI 4130 steel has good mechanical properties, but low elongation and endurance limit when subjected to bending fatigue in the "as-received" condition (not heat-treated). 2.
E., Stress Concentration Design Factors, fifth ed., John Wiley & Sons Incorporation, New York, 1966, 155p [10] Lancaster, J.

Based on finite element method, the FEA model used for analyzing fatigue properties of sample treated by laser shot peening (LSP) was established.
Fatigue failure is the main failure mode of structural parts bearing alternating stress, so the fatigue property of magnesium alloy parts should be urgently raised.
Due to its complicated technology and more factors on strengthening effect, the experiment method used to study the process of LSP is time-consuming.
Table 1 shows mechanical performance of AZ31B and ZK60 magnesium alloys.
Fig. 7 shows the fracture morphology of ZK60 in the peening affected region, the crack slip step turns from surface to sublayer, this phenomenon is in accordance with that of the fatigue life contour in the peening affected region shown in fig. 6, this is because the tensile residual stress appears which contends with compressive residual stress in the peening affected region, the surface compression stress state turns into tension, so the “total stress” is larger than applied stress, which promotes crack initiation and propagation, resulting in fatigue crack.

The tensile properties of these samples have been evaluated and the results presented.
The influence of each factor on the tensile properties of braided fabrics has also been analysed and discussed.
The tensile and bending properties of braided reinforced composite rods have been evaluated and the results obtained presented and discussed.
One of the most serious problems affecting concrete is corrosion of the steel armours.
The samples are being produced with more rovings so that the mechanical properties of the material could be improved.

From the results, it indicated that physical and mechanical properties of newly added brick increased in dry density and compressive strength value but decreased in water absorption rate.
Material and Methods In order to measure the physical and mechanical properties value of each sample, the materials and method were discussed in this section.
Karaman [15] emphasized that the available pore space is affected by properties of clay, method of manufacturing and degree of firing.
Gunal: Firing Temperature and Firing Time Influence on Mechanical and Physical Properties of Clay Bricks.
Thiansem: Effects of Charcoal on Physical and Mechanical Properties of Fired Test Briquettes.