Search results

The obvious diversity of the different property material’s cutting mechanism brings about the complexity of the PCB material cutting mechanism.
The factor affecting the thrust force in the drilling process analysis is as follows: while the workpiece material, drill material, geometry and cooling liquid are certain, the drilling force is the function of the feed rate f and the drill diameter D factors, that is Ff and Fd.
It is found that the most important variable affecting the thrust force is the drill diameter and feed rate.
Simulations And Experiments On Drilling Pcb Based On Thermo-Mechanical Coupling, Proceedings of the 8th International Conference on Manufacturing Research ICMR 2010. p.129-136 [4] C.C.
Part I: Five stage representation of drilling and factors affecting maximum force and torque, International Journal of Machine Tools & Manufacture 46 (2006) p.70–75

The material material performance characteristics of black clay mineral Mineral material is the natural mineral and rock which can be directly utilized its physical properties and chemical properties, or processed natural mineral and rock which can be formed new material.
The porosity is from 29.03% to 51.46%, bibulous rate is from 20.02% to 39.28%, volume density is from 1.15 g/cm3 to 1.89 g/cm3, compressive strength is from 2.07 MPa to 9.86 MPa.They are discussing the influence factors for the performance of the products the which include hole agent, sintering temperature, adhesive and dosage, molding pressure, holding time of factors affecting.
Burning expansivity : the chemical composition of raw materials is the main factor to affect the expansion of roasting ceramisite.
Physical properties : for particles of illite shales, the finer the better, and for the amount of sand, the less the better.
Compared with the performance of marble, granite and other natural stone, the properties of glass ceramics samples prepared by illite shales - nickel-molybdenum-vanadium slag is superior.

Since its invention in American in 1935, parking meter has experienced a developing process from mechanical to electronic operation, from inserting coin to intelligent card (IC card) operation [2].
Taking Guangzhou as an example, it set up 1957 parking meter berths on 54 municipal roads in the urban area in 2006; it increased to about 6000 parking meter berths on 102 municipal roads in 2007; and it had increased to more than ten thousand berths by 2010 [3]. 1.2 Problems existing in the sustainable design of parking meter 1) The equipment operation depends on the energy supply of AC or battery, it is less than satisfactory in the maintenance management of the equipment and in aspects of energy saving and environment protection. 2) Shells of existing parking meter times are made of zinc alloy, its corrosion resistance is relatively poor, its tensile strength under high temperature and impact property under low temperature decrease significantly, therefore, and it can't meet the requirements in weather ability. 3) In the aspect of service design of the product, the existing parking meter is based on the management architecture design of single subsystem model, it is low in technological
In the technology of rainwater power generation, by making use of the principle that transforming mechanical energy generated when the rain falls into electrical energy generated in piezoelectric effect when the piezoelectric ceramic is deformed, this paper has studied the factors affecting energy conversion efficiency of piezoelectric ceramic thin film in the technology of rainwater power generation.
Aluminum alloy is not only superior than zinc alloy in the impact resistance, collision resistance and the adaptation to hygrothermal environment with frequent exchange between high and low temperatures, also, it can be recycled perfectly, as long as being separated properly, it can be melted and recast with the same properties and performance of primary aluminum, which has met the principle and requirements of C2C in “using the hyper-cycle materials"
City, as a collective form of highly developed human, “its moving factors---especially human and their activities---and static elements are equally important.

In practice, the most effective method at present is to assess material properties by performing various kinds of material tests on materials partially cut-out from existing structures [1].
In practice, though all design and standard specification require the definition of tensile properties for a material, these data are only partly indicative of inherent mechanical resistance to failure in service.
For this, the primary fracture parameter is the stress intensity factor, K.
[5] Iron and Steel Engineering Series, Vol. 3, Properties and Tests of Steel Materials (in Japanese), New edition, The Iron and Steel Institute of Japan, Chijin Shokan, Tokyo, Japan, 1977
Sumita, Relationship between nonmetallic inclusions and mechanical properties of steel (in Japanese), Iron and Steel 13 (1971) 1897-1911.

In addition, TRIP steel also has excellent fatigue properties and high strain rate mechanical properties.
The plastic deformation resistance of the material is one of the key factors that directly affects the safe operation of equipment and insurance of the plastic deformation during thermal processing[2].
The deformation resistance is significantly affected by the deformation temperature.
Fig. 4 Effect of deformation rate on deformation resistance of the TRIP steel at different deformation temperature and deformation amount (a) =0.08 (b) =0.18 (c) =0.30 (d)=0.42 (e)=0.58 (f)=0.75 Effect of Deformation Amount on Deformation Resistance The deformation amount affects the deformation resistance significantly in several ways during the hot deformation processes: (1) At a given temperature, as the deformation amount increases, the strengthening will enhanced, resulting in an increase of the deformation resistance.
A Study on Macroscopic and Microscopic Mechanical Behavior of TRIP High Strength Steel for Vehicles.Graduate School of Hunan University,2010: 5-9

The material properties of L-605 cobalt-chromium alloy were used along with the ABAQUS von Mises plasticity model with isotropic hardening.
The local controller adjusted the blowing of assistant gas (air and nitrogen) to reduce the heat affected zone.
Results and Discussion Effects of Reservoir Location on Stent Mechanical Integrity.
However, for the proposed depot stent, the fatigue safety factor was reduced marginally by only 13% when compared to the standard case (Figure 5(c)).
The radial strength and the fatigue safety factor of the proposed depot stent were reduced by only 10% and 13%, respectively.

Table 1 Chemical composition analysis results of the cracking axis explanation chemical composition C Si Mn P S cracking axis 0.45 0.30 0.62 0.015 0.008 technical conditions 0.42/0.50 0.17/0.37 0.50/0.80 ≤0.040 ≤0.040 (2)Measuring mechanical properties Cracking shaft from the mechanical properties of the sample measured results are shown in Table 2.
For comparison, the table also lists the national standard GB3077 cracking on the mechanical properties of the alloy steel shaft material 45 required value.
Table 3 compares the mechanical properties of carbon steel containing carbon content of the three morphology of 0.45%.
In fine grain steels, widmanstatten mechanical properties of steel do not show harmful effects.
It seems coarse grains have an adverse effect on the mechanical properties of steel, when there appeared widmanstatten particularly evident.

The research results showed that the strain limit and low cycle fatigue life were the two factors for service life.
The study of low cycle fatigue life under the influence of two factors includes: The first was the effect of strain amplitude on low cycle fatigue.
When plastic strain occurs before low cycle fatigue damage, such as creep, bending and formation factors, the fatigue state will change.
The service life of casing materials is affected by multi - factors under the service environment of thermal recovery wells.
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2018, 734: 20-26

The numerical simulation of composite forming is an efficient means of evaluating factors related to the manufacturing process, and helps to obtain optimum processing parameters.
In this study, the influence of the stamping parameters is determined on the flexural properties, void content and void distribution.
The mechanical properties thus obtained, were compared to the properties obtained by compression molding and by stamp forming of the pre-consolidated fabric.
For a 1485gsm fabric, the flexural properties obtained were lower but for a 743gsm fabric, the flexural properties obtained were equivalent to the optimal properties of compression molding process.
For each material form, the effects of the stamping parameters on flat plaque properties were examined.

According to the literature survey and test data report, the major factors which influence the reliability of 32m prestressed RPC girder in railway bridges are given in this paper.
Introduction RPC (Reactive Powder Concrete, RPC) is a new type of high performance composite material and has shown a wide applied prospect because of its good mechanical property and good durability [1-3].
At the same time, there exist many uncertain factors in structural engineering, so the statistical property of random parameters for the system including material characteristics and practical dimensions of the structure as well as loads will be changed.
The indeterminacy of the materials of structural members is mainly due to the quality of the material and the property variation of the material caused by the factors such as fabrication technology, load conditions, outline dimension and the environmental conditions etc.
Conclusions By study, the major uncertain factors for affecting the reliability of 32m span prestressed RPC girder in railway bridge are given.