Search results

Generally, the welding quality of spot welding is a very important factor that affects the basic properties of a junction, such strength, solidity and reliability.
Thus, the life cycle of what are predicted by utilizing measurable mechanical properties and fatigue characteristic data of materials to reduce a lot of time and economical burden.
Table 1. and 2. show the chemical compositions and mechanical properties of EZNCEN and HS40R.
Fig.4 shows welding current affecting the tensile-shear strength of a specimen for testing 2-lap spot welding in the range of welding time of 15cycle, pressurization 300kg, and welding current 4~13kA.
Also, Fig.5 shows the welding current affecting the tensile-shear strength of specimen for testing 3-lap spot welding in the range of welding time 15cycle, squeezing pressure 300kg, and welding current 5~12kA.

It was discovered that subsurface cracks distributed around shear stress peak, and flaking failure was dominated by subsurface shear stress. 1 Introduction PPS (Poly-phenylene-sulfide) has excellent mechanical properties such as water resistance and corrosion resistance.
Due to such mechanical properties, PPS bearings are widely used in food processing machines and washing machines.
(2) Shear stress is affected by friction between subsurface crack faces and shear stress works as crack driving force.
Lundberg and Palmgren, Dynamic capacity of rolling bearing, Acta Polytechnica, mechanical Engineering.
(Editor-in-Chief), Stress intensity factors Handbook Vo4, 2001, pp1072-1075, The society of the Materials Science, Japan & Pergamon Press

Surface treatment has affected the properties of the composite panel by increasing the interlaminar fracture toughness by a maximum of 53% at a 5.8vol% silane concentrations.
Silk has very good mechanical properties and is widely used in the textiles industry due to its luster [3].
Composite properties have a very strong dependent on the interphase between fibers and polymers [4].
The interphase properties can be determined by a surface treatment on the fibre which is applied during the manufacturing process.
Interfacial strength between the fibre and matrix has been a very important factor affecting the interlaminar fracture toughness of fibre reinforced plastics composites.

Surface treatment and number of woven silk fibre layers has affected the interlaminar fracture properties of the composite panel.
Silk has very good mechanical properties and widely used in the textiles industry due to its luster and strength [3].
Structural materials made from woven silk fibre reinforced epoxy composites require further improvement in order to increase their interlaminar fracture toughness properties.
Composites properties have a very strong dependent on the interphase between fibers and polymers [4].
The interphase properties can be determined by a surface treatment on the fibre which is applied during the manufacturing process.

In milling the adhering despair is an important factor that affects the normal running of the roboticized equipment.
We have also analyzed the rule that the milling temperature affects the adhering disrepair, given a theoretic base of the study on the groove optimization.
In order to judge the temperature field, many factors must be taken into account, and some of them are difficult to measure, so it is blurry.
By temperature field's finite element analysis, the fuzzy comprehensive evaluation for temperature field and thermal stress analysis is made, and the premium properties of waved-edge milling insert could be forecasted.
Jiang: Wear, Vol.214, (1998) [4] Z.J Li: Journal of Mechanical Engineering, Vol.29, (1993) No.8, pp.4.

Introduction Nickel-based superalloys have attracted a great deal of interest from aircraft and nuclear industry with the heat treatment industry because of its resistance to heat, excellent mechanical properties, resistance to corrosion and high temperature operation [1].
ANOVA is utilized to statistically determine the degree of significance of the process factors that affect performance characteristics [7].
Response Surface Methodology (RSM) is employed to obtain an empiric correlation between the control factors and responses.
In order to compare the influence of factors on different responses, the average S/N ratios of responses related to the levels are calculated and given in Table 2.
The most effective factor on the cutting force by ANOVA is found to be cutting speed (58.54%), followed by feed rate (41.10%) and for the surfage roughness the most effective factor is feed rate (80,09%), folloved by cutting speed (5,4%) for machining Incoloy 901.

The research results can provide reference for the analysis of the factors affecting the riser stress in deep water drilling.
Egeland[7] (1982) used linear and nonlinear methods to analyze the mechanical problems of drilling risers in deepwater semi-submersible drilling rigs.
Bjorset et al.[8] (1998) studied static and dynamic mechanical analysis of fluid-filled drilling risers.
It is assumed that the riser, casing and formation are homogeneous in the horizontal direction, and the thermal and mechanical parameters are not changed.
Problems affecting the design of drilling risers[C].

The factors such as temperature and pressure of the inside air and the kinetic parameters of the ball joint that influence natural frequencies and vibrational modes are considered.
Take account of the process, stress characteristics and other factors, some T-tubes and bends should be thickened that makes the cross-sectional size of the duct not uniform.
The properties of A312 TP321 and 2042 T42 at typical temperatures [8] are shown in Table 2 and Table 3.
In the calculation process, the properties at other temperature points can be obtained by linear fitting.
Influencing Factors Temperature and Pressure Thermal stress and compressive stress due to high temperature and pressure gas in ducts will affect the mechanical properties of the materials directly [9], thus affecting the natural vibration characteristics of the structure.

Heat treatment methods are employed to increase the mechanical properties of these grades.
Nasery et al. [10] investigates the effect of corrosion nature and mechanical properties of AISI 420 MSS by heat treatment.
Experimental results show that corrosion resistance and mechanical properties are improved through optimized heat treatment.
Cutting depth is the main factor affecting cutting force and next to it is speed and then feed.
Chemical composition and mechanical properties of specimen are shown in Table 1 and Table 2 respectively.

The main advantage of workpieces produced by ring rolling, compared to other technological processes, is given by the size and orientation of grains, especially on the worked surface which give to the final product excellent mechanical properties.
The software, due to self centring properties, lets to simulate the process without the Guide rolls.
All the tools were simulated as rigid bodies and between the rolls and the workpiece a shear friction factor equal to 0.7 was set.
On the contrary the maximum Idle seems to be less affected by the speed laws.
[5] Zhou G., Hua L., Qian D., Shi D., Li H., Effects of axial rolls motions on radial-axial rolling process for large-scale alloy steel ring with 3D coupled thermo-mechanical FE, International Journal of Mechanical Sciences. 59 (2012) 1-7