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Therefore, we conducted an orthogonal test of 4 factors and 3 levels to study the effect of some parameters on the porosity of the preform.
Four factors and their corresponding levels in the study Factor Sintering temperature ℃ A Sintering time(h) B NaCl Size(mm) C Cold-compacting pressure(MPa) D Level 1 540 1.5 1.18-1.7 5.0 Level 2 570 2.0 1.7-2.36 7.5 Level 3 600 2.5 2.36-3.35 10.0 Table 3.
The irregularity and nonuniformity affect the mechanical and electrical properties of the samples.
Among the 4 parameters, the porogen size affects the porosity most.
Mortensen, Influence of the infiltration pressure on the structure and properties of replicated aluminium foams, Mat.

Grease service life is connected with the composition and properties of greases and the functioning conditions.
The failure of grease is caused by many factors, but it can be concluded into two aspects: physical mechanics factors and chemical factors.
Failure Caused by Chemical Factors.
Therefore，temperature, load and rotation speed are the main factors which affecting the grease bearing life.
Grease Properties and Applications.

Machining Parameter Optimization of Aero-engine Blade in Electrochemical Machining Based on BP Neural Network Zhiyong Li 1,a , Hua Ji 2,b Hongli Liu 1,c 1 School of Mechanical Engineering, Shandong University of Technology, Zibo, 255091, China 2 School of Electrical and Electronic Engineering Shandong University of Technology, Zibo 255049, China a lzy761012@sdut.edu.cn b jihua303@163.com c liuhongli.com@163.com Keyworkds: electrochemical machining, neural network, parameter optimization, aero-engine blade Abstract: Because the process of blade in electrochemical machining(EMC) can be effected by many factors, such as blade shapes, machining electrical field, electrolyte fluid field and anode electrochemical dissolution, different ECM machining parameters maybe result in great affections on blade machining accuracy.
Being a non-mechanical metal removal process, ECM is capable of machining any electrically conductive materials with high stock removal rates regardless of their mechanical properties, such as hardness, elasticity and brittleness.
These process parameters are capable of affecting the machining accuracy of ECM.
According to ECM electrolyte fluid theory, two main factors, electrolyte temperatureT and electrolyte pressure between electrolyte inlet and outlet P have important influence onκ.
The main causes resulting in high failure rate is that there are so many various ECM process parameters which can affect ECM process stability and machining accuracy.

Microstructure and crystallographic texture play an important role in the sputtering target properties.
The high shear strain introduced by the asymmetric rolling and the strain path change in every pass during cross rolling are probably the main factors affecting the texture evolution of the ACR sample.
Michaluk, Correlating discrete orientation and grain size to the sputter deposition properties of tantalum, J.
Barlat, Asymmetric rolling of interstitial free steel sheets: Microstructural evolution and mechanical properties, J.
Hamad, Structural features and mechanical properties of AZ31 Mg alloy warm-deformed by differential speed rolling, J.

The results of work on the study of the chemical-mineralogical composition and physico-mechanical properties of the medium-fractionation products of the waste heaps processing with reference to the production of various wall ceramics products are presented.
Their role is shown as a polyfunctional additive when introduced into ceramic masses and affects the properties of finished products.
This tendency is primarily due to economic factors, producing materials with technology observance and low cost.
These rocks have certain plasticity and cohesive properties.
Such rocks do not have any plasticity and cohesive properties even after additional reduction process.

Temperature-dependent material properties are also considered.
However, Park adopted a backup material whose material properties are twice as stiff and twice as strong as those of the workpiece material in his simulation.
The temperature-dependent physical properties of AISI 1045 steel are also considered in this study.
Similar to other factors (such as friction or flow stress), this value can influence the predictions and must be estimated with reasonable accuracy [12].
And the effects of cutting parameters and different backup material properties on the burr size will be investigated in the further study.

Typical stress-strain curves for steel tube Material Properties
The following is the analysis of the effects of other different factors on seismic performance of RCFST.
It can be found that n is an important factor to affect the skeleton curve shape from Fig.7.
Axial load ratio and steel ratio are two most critical factors which affect skeleton curves of RCFST.
Experimental study on the mechanical behavior of recycled aggregate coarse concrete-filled square steel tube column, 2010 International Conference on Mechanic Automation and Control Engineering (MACE), (2010)

Therefore, the water permeability of the cementitious material is very crucial to its durability[1].Permeability is the basic properties of porous material.
There are many influence factors affect the permeability of cement-based composites, the most important parameter that affects permeability properties is its pore structure[2].
Pore structure is a very important microstructural characteristic in a porous solid because it influences the physical and mechanical properties, and controls the durability of the material.
Using fractal theory to analyses and appraises the characteristic, composition, structure, describe the fine structure on the micro-scale and the dynamic mechanical behavior is very effective.

Importantly, all construction operations and other activities that are likely to affect the physical-mechanical properties of soils and the stability of the soil-structure system should be properly taken into account.
Among other numerical methods for solving problems is the finite element method (FEM) that has a number of advantages, such as: · A quite large number of factors that are likely to affect the stability of soil-structure systems can be taken into account; · Soil-structure interaction can be evaluated individually at different stages of construction and operation of the structure; · emergency situations can be simulated; · Different models of materials behavior can be used for soils and building structures [5].
The model implies elastic behavior; material properties are as follows: specific weight γ = 0 g/cm3, modulus of elasticity E = 1000 kN/m2, and Poisson's ratio ν = 0.25.
[4] Pospíchal, V.; Kravcov, A.; Selesovsky, P., Zdebski, J., Experimental Studies of Blast Pressure Due to Vented Explosion of Methane-Air System, Lecture Notes in Mechanical Engineering. 2016, 2017 129-138.
Software for estimation of second order effective material properties of porous samples with geometrical and physical nonlinearity accounted for // 2015   Advances in Engineering Software, Pergamon Press Ltd.

This thesis provides an evaluation of quality loss and flexural strength and compression strength reduction of Elastocoast® PUR-stone samples after 300 times freeze-thaw cycling, addressing the main influential factors on the frost resistance durability of Elastocoast® PUR-stone under the freeze-thaw cycling conditions, which shall provide a referential basis for the application of the material in northern regions[2] -[5].
The weighed samples are then placed on mechanical testing machine for compression strength tests after bending.
Fig. 1 Variation curve of flexural strength of sample after 300 times freezing-thawing cycling It can be seen from Fig.1 that with the increase in the number of freezing and thawing, PUR-stone strength properties are decreased, wherein the flexural strength is prominently lowered with increase of freeze-thaw cycling frequency, the decrease trend of test samples after 150 times freeze-thaw cycling is more prominent, the final strength loss peak value can reach 61%, obviously, the damage of freeze-thaw cycling on the flexural strength is very obvious.
(4) Elastocoast® PUR-stone is a kind of perfect protective material which has good mechanical properties to resistant freeze-thaw damage .
References [1] Gu (2007) Hydraulic Properties PUR-Revetments compared to those of open Stone Asphalt Revetment[Z], TU Delft, Msc.