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Dominating factors for controlling the (Al,Mg)B2 phase and mechanical behaviors are discussed in terms of structural identifications.
The AlB2 in Al matrix is usually formed from the phase transformation of AlB12 phase, and the AlB12 phase gives a detrimental effect on the mechanical properties of aluminum matrix composites.
Therefore, in this study, the microstructural evolutions of the in-situ (Al,Mg)B2 in Al-Mg-B alloy have been investigated and the effects on the corresponding mechanical properties, as well.
However, at the present stage, further heat treatments have not been undertaken, since the small AlB12 phase would not critically affect the mechanical properties of the composites.
Very recently Jakes [5] invented a new data analysis method to measure the properties of micrometer-sized particles embedded in matrices.

In this paper we make full use of the advantages of FA and the properties of Elman neural network structures to establish FA-Elman algorithm.
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.
But application of this kind is not common in Elman neural network, people like Yan Weiguo proposed a method of modeling based on PCA and Elman network to evaluate the quality of mechanical products and apply it in predicting mechanical properties of cold-rolled ribbed steel wires and bars[9].
We analyze the sample data by PCA and FA, respectively, Exact 16 principal components and 16 factors from the case, take scores of the principal components or factors as the inputs of the network and establish a new Elman neural network.
Quality modeling of mechanical product based on PCA and Elman neural network.

Investigating Time Dependent Mechanical Properties of Epoxy with Nano Particles by Using Indentation Tests Guo-Wei Ruan, Ming-Chen Chuang, Hsing-Han Yen, Chin-Tu Lu and Nai-Shang Lioua Department of Mechanical Engineering, Southern Taiwan University No. 1, Nan-Tai Street, Yungkang Dist., Tainan City 710, Taiwan R.O.C anliou@mail.stut.edu.tw Keywords: Constitutive equation, viscoelastic, epoxy Abstract.
The objective of this study was to examine the time dependent mechanical properties of epoxy without/with nano particles composites and how the nano particles in the epoxy affect the relaxation properties of epoxy.
The ramp-hold indentation tests were used to investigate the time dependent mechanical properties of epoxy with and without Al2O3 nano particles.
In order to perform high fidelity finite element simulation to identify the fracture properties of embedded biological specimens, the proper time dependent mechanical properties of matrix material should be used in the FE analyses.
The objective of this study was to examine the time dependent mechanical properties of cold mounting epoxy with Al2O3 nano particles under indentation tests and to identify material parameters for the easy-to-use constitutive equation which can describe the time dependent mechanical response of aforementioned epoxy for finite element analyses.

Then, the factors affecting the forming quality are summarized.
In view of this, on the basis of analyzing the forming quality of 3D concrete printing materials, the factors affecting the forming quality and the optimization and improvement methods were studied in this paper.
There are many factors that affect the forming quality of concrete 3D printed components, and the consequences brought by them are different.
Model slice thickness, path planning algorithm, etc. all affect the surface quality of the molded part and the mechanical properties of the molded structure.
Influencing factors and control methods of 3D concrete printing quality.

The mechanical properties of Mg-Zr-Ca alloys are determined from compressive tests, the corrosion behavior is studied using immersion tests, and biocompatibility is evaluated by cell growth factor using osteoblast-like SaOS2 cell.
Mechanical property test.
Compressive properties.
Therefore these hot-extruded alloys can offer good mechanical properties for orthopedic applications.
It is considered that the enhanced mechanical properties of the alloys are related to finer microstructures.

Meanwhile the key-factors affecting the hydraulic effective density and fluid bulk modulus were discussed.
Hydraulic fluid itself has great influence on the work of hydraulic components, for instance, fluid temperature,pressure, amount of air in fluid and so on can all affect fluid effective property, which is the main factor influencing the accuracy of hydraulic system dynamics analysis, modeling and simulation.
The temperature will change the amount of air inhaled and the air bubble volume as well as the gas compressibility, so it should also affect the fluid property [6-7].
Mathematic Modeling Generally, the temperature and pressure of hydraulic fluid will change when hydraulic system is working, which affect the density of hydraulic fluid; and the influences of the both factors coexist simultaneously.
The three-dimensional picture resulting from simulation program demonstrate the main factors which affect the fluid effective density change, which also provide engineers and technicians a more direct-viewing reference, thus laying a foundation for their designing accurate hydraulic systems model and carrying out dynamic analysis.

The results showed that: 0.25mm sheet of polystyrene made of the thickness of the main raw material by injection molding process, and factors affecting the performance of the sheet, the better the performance of the film material process parameters.
Greatly improved the formation of chemical bonds can be made of polystyrene, and the compatibility between starch, thus ensuring the synthesized starch-based biodegradable material has a tensile strength, the material forming the basis for the future[7]. 2.1 Orthogonal Design Affecting the starch-based biodegradable packaging materials antibacterial properties of many factors, the experimental analysis of the information obtained, directly affect the test results, there are four underlying causes can be made of polystyrene dosage, amount of starch, toluene and acetone ratio and antibacterial agent delivery type[8].
In the case of normal temperature and pressure molding time was 12h, emphasis on the amount can be made of polystyrene, starch dosage and type of antimicrobial agents on the material properties, so the experimental design three factors, three levels of L9 (33) orthogonal test table .
Analysis and discussion 3.1 expandable polystyrene content on material properties Expandable polystyrene material tensile strength dosage is a major factor.
(5) toluene, acetone delivery ratio as well as the mechanical properties of the material degradation is not significant

The measurement principle, the mechanical device and the evaluation method for the temperature regulation properties of textile fabrics were introduced.
Heat-moisture transfer performance of the textile materials such as fabric is one of the key factors affecting clothing wearing comfort, which also decides the performance of some special functional fabric.
Thermal performance and heat transfer properties during the dynamic contact process between the skin and the clothing are referred to as temperature regulation properties of textile fabrics, which greatly affect the clothing comfort and consumers purchasing behaviors.
Mu Yao and Jian-yong Yu [10, 11] respectively analyzes the factors that influence the textile steady-state thermal properties of fabric using a self-developed heat transfer performance tester, and found that thickness of the fabric have greater impact on the thermal performance of the fabric.
Therefore, the fabrics’ behaviors significantly affect the temperature regulation properties of all indices.

The formation of quality indicators at the stage of mechanical processing requires a deep analysis, which allows us to identify the factors that have the greatest impact on the roughness and accuracy of the shape of the surfaces of precision machine parts during their manufacture.
The formed local metastable layer on the surface of the workpiece differs in its mechanical properties from the main part of the material, which at the intersection with the cutting plane will lead to an instant change in the stress-strain state in the chip formation zone, affecting the properties of the closed potentially self-oscillating technological system and thus dynamically stabilizing the machining process.
The local zone, with its distorted crystal lattice and mechanical properties different from the main metal volume, causes an instant change in the stress-strain state in the chip formation zone.
When the cutting plane intersects with the local heat-affected line, the chip angle changes due to the difference in dissipative properties of the main material of the workpiece to be machined and the material in the local impact zone.
Fig. 3 The process of applying local thermal impact: 1 - contactors - devices for applying a local thermal effects; 2 - workpiece (material – steel 45); 3 - tool holder; 4 – device for applying local thermal effect Firstly, the treated surface will have local areas with other physical and mechanical properties than the material of the workpiece, which will have a negative impact on the operational properties of the part.

These factors can contribute to a reduction in product strength.
Additionally, several factors influence the mechanical properties of the weld, particularly the hardness of the material in the welded area.
Table 1 presents the chemical composition of Alloy 6061, while Table 2 outlines its mechanical properties.
Mechanical Properties of A6061-T6 Alloy [10].
Hafidzal, “Effect of heat treatment on microstructure and mechanical properties of 6061 aluminum alloy,” J.