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The extrusion width depends on the properties of the plastic material; it is about 1.2 ÷ 1.5 times of the nozzle diameter [6].
In the demand of optimization of the forming parameters, a quadratic experimental design with the polynomial regression equation is selected with the following general form: y=bo+i=1kbixi+i=1kbiixi2ifactor Central Composite Face-Centered Design is selected because it has some good properties such as: ability to describe well the properties of research objects in the design space and having contains full factorial design of 3 factors inside.
The count of tests to be conducted is 17 with 3 factors are considered.
An experimental matrix including three coded factors is illustrated in Table 3.
Adhiyamaan, “Investigation on the effect of fused deposition modeling process parameters on flexural and surface roughness properties of PC-ABS blend”, International Journal on Recent Technologies in Mechanical and Electrical Engineering 2(8), 2015

The slag content, the creation of the early hydrated products, pore structures of OPC mortars introduced with BFS are considered as the main factors.
Physical and chemical properties of BFS are believed as the reason.
“Mechanical activation of granulated blast furnace slag and its effect on the properties and structure of portland slag cement”, Cement and Concrete Composite, 30, 679-685
“Hydration, structure, and properties of blast furnace slag cements, mortars and concrete”.
C., and Wellington R., Mechanical properties, drying and autogenous shrinkage of blast furnace slag activated with hydrated lime and gypsum, Cement & Concrete Composites, 32 (2010) 312–318

Fig. 1 Tensile curves of low carbon steel There are three external factors affecting the yield stress of materials: temperature, strain rate and stress state.
Instability in the torque in coiling process will lead to inaccuracy in tracking torque, affecting constant tension control.
Owing to temperature directly affecting strip hardness, the coiling torques can be compensated according to the variable temperature [7].
It includes a gain factor and the bending torque.
Shin: Journal of Mechanical Science and Technology, Vol. 19 (2005) No.4, p.958.

For the assessment of mechanical properties of rubber compounds, tensile and hardness tests were performed.
Mechanical Properties of Compounded Rubber.
Table 4 summarizes the mechanical properties of the compounds filled with CB and AC.
Mechanical properties of rubber compounds filled with CB and AC.
Mechanical properties of activated carbon (AC) coconut shell reinforced polypropylene composites encapsulated with epoxy resin.

.), 200, 240 and 280°C for studying systematically the influence of substrate temperature on morphologies, phase components and mechanical properties of CrN coatings, using the single-target magnetron sputtering in a direct-current mode.
Some researchers linked TS to the phase structure and mechanical properties of coatings[9], however, others think that TS would affect the growth of coatings so that it can make much difference to the morphologies of coatings[10].
Therefore, CrN coatings were produced by reactive magnetron sputtering technique in this paper, and the influence of TS on structure, morphology and mechanical properties of CrN coatings was studied by different analytical techniques such as XRD, SEM and EDS.
Ltd, Shanghai, China) and a MFT-4000 tester for material surface properties (HuaHui Instruments technology Co.
Substrate temperature is a very important factors, the compactness and crystallinity of CrN coatings improved with the increase of substrate temperature.

Based on the analysis of the piston engine camshaft common failure mode, combining the mechanical analysis and risk management means，the feasibility of its repair was much discussed, the repair technique are studied, and proved its correctness and effectiveness.
Therefore, as long as the cam contour grinding quantity is not big, hardness on the surface of the cam will not change; its wear resistance will not be affected.
The camshaft is bad working conditions; the camshaft quality factors (such as the accuracy of type lines, accuracy of form and position, surface roughness, etc.) is sensitive to the work reliability of cam and engine performance, any quality factors are likely to cause a serious accident.
Using CNC camshaft grinding machine can not only basically eliminated all kinds of defects of the cam profile after grinding (e.g., surface burns, the chatter marks), cam contour lines maximum error is less than 0.01 mm, greatly ensure the quality of the cam repair; but also man-made factors affecting is small, conducive to ensure the stability of quality, at the same time also do not need additional tooling, camshaft repair can be directly to the clamping and not reduce the clamping precision.
Profile accuracy detection Cam contour lines not only affect the engine valve-train performance (i.e., the valve’s ability can pass) and dynamic performance (such as impact load between the cam and tappet body), but also affect the contact stress and lubricating properties between cam and tappet body.

After getting the MARS results of mathematical expression, we can screen the factors which benefit to the response variable by individually analyzing the internal relations between them and analyze the importance of factors with investigating the contribution of each factor to the response variable to facilitate decision-making.
While in the material processing field, only Taylor and Francis [9] analyzed the mechanical properties of steel by MARS method currently, and no scholars apply this method to calculate and forecast the flow stress.
For testing the effect of a certain factor on flow stress, the common methods set other factors as constants that usually are averages.
The importance of various factors to flow stress could be analyzed through the MARS model.
Conclusions (1) Using MARS algorithm, the fit of the relations between flow stress and the influence factors is good.

One of the parameters affecting bitumen stability is Gaestel colloidal index (CI) [25].
Therefore, five factors were included in the regression analysis.
It indicated that the factors are suitable for analysis.
However, the mechanical properties of the mixture specimen with Fo show inferiority.
Effect of rheology on the bitumen foamability and mechanical properties of foam bitumen stabilised mixes.

It is found that the new model can accurately characterize the hyperelastic mechanical properties of the experimental specimens in different deformation states.
However, due to the complexity of rubber characteristics, nonlinear material and geometric properties bring great difficulties to the research, so finite element analysis (FEA) has become the main means of rubber mechanical analysis.
Filled rubber is very sensitive to the temperature and strain state, and the manufacturing process and composition of rubber also have a significant impact on the mechanical properties of rubber [1].
The main factor affecting the accuracy of this method is the edge effect of the free edge (the left and right sides that are not constrained in the plane tension) of the rubber sheet, and the strain state is not uniform in this region.
Liu, Determination of the mechanical properties of the different layers of blood vessels in vivo, Proceedings of the National Academy of Sciences, 92 (1995) 2169-2173

Assessment of physical-mechanical and technological properties of the materials was performed according to standard procedures.
The results of testing samples of the material demonstrate a low value of water absorption (30 days - 0.85 %), which positively affects its mechanical properties.
The poor quality of the impregnation of the filler with a highly viscous binder melt leads to a decrease in the mechanical properties of PCM.
By the level of physical and mechanical characteristics, fire hazard properties and heat resistance, these materials fully comply with the requirements for modern thermoplastic PCMs and are not inferior to foreign analogues.
Gu, Factors affecting thermal conductivities of the polymers and polymer composites: A review, Composites Science and Technology. 193 (2020) 108-134