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Chang Institute of Mechanical and Electro-Mechanical Engineering, National Formosa University, 64, Wenhua Rd., Huwei, Yunlin 632, Taiwan a sylin@nfu.edu.tw, bcmchang1230@yahoo.com.tw Keywords: Process parameters, Negative strain hardening rate, Mechanical force, Hydro-forming Abstract.
Although low ductility and poor formability properties always accompany Mg alloy at room temperature due to the hexagonal closed-packed crystal structure, the development of some effective forming techniques overcoming this forming difficulty for this kind of material is strongly worth exploring in industry.
The investigated factors are type of lubricant, initial extrusion speed, temperatures and type of material.
ANOVA was used to investigate how parameters affect the extrusion process.
The shear friction factor, m, specified at the interface between tube billet and the forming tools varying from 0.01 to 0.3.

It is also necessary to analyze and extract useful characteristics of variables from large quantities of data and eliminates the influence of relevant and repeated factors, so as to reduce as many feature dimensions of the samples as possible without affecting solving the problems.
PCA is a method to represent the original multiple variables with several comprehensive factors and make the comprehensive factors reflect as much of the information of the original variables as possible and the comprehensive factors do not relate to each other so as to reduce dimensions.
These comprehensive factors of y1, y2, …, yp are defined respectively as the first, second…pth principal components, and their variaces are degressive.
Case Analysis As data is known[10], we use meteorological factors to predict the occurrence degree of wheat midge.
Dimensions of raw data are reduced by PCA, which not only reduces data redundance but also eliminates influence of the relative factors.

Embedding CNT and CNF fiber is easy, and this does not downgrade the material’s mechanical properties.
Glass fiber reinforced polymers (GFRP) have high tensile strength, heat and fire resistance properties, chemical resistance, and moisture resistance properties which make it appropriate for the above fields.
Many research studies show that mixing of MWCNT together with resin by ultra-sonication and mechanical stirrer results in improvement of the mechanical and electrical properties when applied between E type glass fiber.
Thus, addition of CNF and MWCNT makes the material to sense the structural damages without affecting its structural strength.
Ayatollahi et al, Mechanical and electrical properties of epoxy/ multi walled carbon Nano tube/ Nano clay Nano composite, 2011

Macroscopic mechanical response is one of the key factors in designing pressure vessel.
It introduces a pressure vessel from geometric model building, the definition of the material properties and the finite element mesh division in self-respect, hydraulic, internal pressure load respectively under the action of macro mechanics response of numerical calculation.
The concrete material properties are listed in Tab.2.
In addition, the different part of the pressure vessel material, according to the material parameters list, defines corresponding material properties.
Calculation of pressure vessel under hydraulic load the mechanical response The mechanical response under the action of hydraulic should be simplified.

The structures and properties of the SAPs are strongly affected by the reaction conditions.
As the effect of these factors has been discussed in detail in the previous literature, we just gave out the test results in Figure 4.
Fig. 5 Swelling kinetic behaviors of SAPs in 0.9wt% saline solution Mechanical properties of the SAPs.
For effective application of a hydrogel on hygiene products, it is extremely important that the hydrogel presents satisfied mechanical properties [21].
El-Naggar, Swelling and mechanical properties of superabsorbent hydrogels based on Tara gum/acrylic acid synthesized by gamma radiation, Carbohyd.

Several soil properties, such as-cohesion, angle of internal friction and density were measured.
Using borehole (BH) log data and above mentioned soil properties, polder embankments were modelled using Geo5 software.
Fig. 3 presents soil properties obtained from field tests in various soil layers of the above mentioned boreholes.
Since, different grain sizes affects the engineering properties of soil and influence soil classification, grain size analysis provided the required grain size distribution.
Safety factors (FoS) is higher than critical 1.2 in all of the above scenarios.

The peak sound absorption coefficient was used as the system characteristic behavior sequence, and the percentage of voids in different equivalent diameter range was used as the system related factor behavior sequence.
Research on Skid Resistance and Noise Reduction Properties of Cement Concrete Pavements with Different Surface Textures, Journal of Highway and Transportation Research and Development, 2013, 7(2): 22-27
Optimized Acoustic Properties of Cellular Solids, Journal of the Acoustical Society of America, 1999, 106(2): 756-765
Analysis of Factors Affecting Water Stability of Asphalt Stabilized Macadam Based on Grey Entropy Method, Journal of Chongqing Jiaotong University (Natural Science),2008, 27(06): 1077-1080
Study on Mechanical Properties and Micropore Structure of FRCC Based on Grey Entropy Method, Concrete, 2019(06): 13-17

Tin increase the tensile strength and hardness of steel and reduce the impact property, which affects the processability of mild steel and is also one of the reasons causing embrittlement.
One of the main factors affecting hysteresis loss is the grain size and the optimum size is in the range of 100-150μm.
Even the Cr-containing cast iron is used for advanced nuclear reaction materials thanks to the excellent properties.
However the formation of sigma phase will damage the properties as ductility and impact toughness.
Adding tin will improve the cutting performance, and the mechanical property of tin-containing steel is equivalent to that of lead based cutting steel.

Temper- ature not only changes the mechanical properties of materials[1-6],but also affect the material processing performance, and other properties.
Effect of tempering temperature on mechanical properties of 83 steel[J].Transactions of Materials and Heat Treatment,2010,31(9):77-82.
Effects of Continuous Annealing Parameters on Microstructure and Mechanical Properties of Ultra-high strength Dual Phase Steel[J].
Materials for Mechanical Engineering,2010,34(9):23-26.
Chinese Mechanical Engineering,2010, 21(16): 1902-1906.

Roughness Effect on the Mechanical Properties of Ceramic Materials Measured from Nanoindentation Tests A.
Introduction Sensing indentation techniques have allowed determining mechanical properties like Hardness and Young´s Modulus from small samples.
PSRM fits to obtain independent-load mechanical properties.
True mechanical properties vs.
Mechanical properties vs.