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According to the factors which affected the properties of the composites, the orthogonal table of L16 (45) was adopted.
Levels of the factors were shown in Table 1.
Factors in order which affected flame-retardant property were: addition of flame-retardants>mass fraction of fibers>length of fibers>molding temperature.
But it had some effects on the mechanical properties of the composites.
Mass fraction of fibers was also an important factor affecting mechanical properties of composites.

The properties of the material affect the quality of the manufactured product.
Unfortunately, this often leads to disappointment as the device rarely behaves as it was designed to because the material properties of interest are affected by the microstructure of the materials.
Effect of materials properties on engineering design Performance of product is limited by material properties.
Properties of Materials Microstructure influence most of the material properties.
Material Factors Material properties influence design and planning for micro-manufacturing, compared to that in macro-manufacturing, which, for example, is reflected in the following aspects [5]: · Influence of the size effects on mechanical, thermal, electrical and magnetic properties, biocompatibility and chemical compatibility, hydrophile and hydrophobe properties, etc. need to be understood, and some of these may be significantly different, compared to the material behaviors in the macro-scale, · In the consequence to above parameters, mechanisms of material conversion processes (separation, deformation, joining/deposition chemically and physically) will be different or affected, as well as interactions between the materials and processing tools (for tool-based processes), · In hence of the above, selection of the means for enabling material convention processes will be affected, the considerations including effectiveness and efficiency and effects on the material properties of

Introduction Titanium foam has attracted considerable attention as bone implant due to its high porosity, good mechanical properties, excellent corrosion resistance, favorable permeability and biocompatibility [1-3].
To address this issue, the mechanical properties of titanium foam should be tailored by controlling the porosity, pore size and porous morphology [4-8].
Results and Discussion The addition of space holder is an important factor that affects the porosity of the as-sintered titanium foam.
Fig. 1 Porosity of titanium foam versus addition of space holder content The size and distribution of the space holder directly affect the pore size and distribution in the as-sintered samples, and thus the mechanical properties.
The two primary factors affecting the compressive strength of the titanium foam are the pore size and porosity.

Based on this, the sensitivity analysis of the factors affecting the pressure carrying capacity of the pipeline, such as the internal pressure, the confinement state and the material performance, was carried out.
In this paper, the pressure carrying capacity of X80 pipe with plain dents and its influence factors such as internal pressure and material properties will be studied through FEA method, which can provide the basis for safety assessment of the dent pipelines.
The constitutive curve of material properties is shown in Fig. 2.
Fig. 2 Constitutive curve of material properties Simulation Result Effect of the Internal Pressure.
Conclusion The sensitivity analysis of the factors affecting the pressure carrying capacity of the dent pipe has been carried out, and the following conclusions can be obtained

Investigation on Delamination Factor in Drilling Medium Density Fiberboards with Variable Feed Pressure using Multi-Spindle Drill Kun Wang1, a, Cheng Wang1, b and Meng Gao1, c 1College of Mechanical Engineering, Tongji University, 200092, Shanghai, China akunwang@tongji.edu.cn, btjchengtj@126.com, cmenggaotj@126.com Keywords: drilling, medium density fiberboard (MDF), delamination factor, response surface methodology, analysis of variance (ANOVA) Abstract．Drilling quality in manufacturing medium density fiberboards (MDF) is greatly affected by delamination.
Literature survey reveals that no systematic study has been reported to analyze the main and interaction effects of drilling process by a multi-spindle drill on delamination factors.
The important properties of the tested medium density fiberboard (MDF) are given in Table 2 [5].
Experimental factors and levels Factor Notation Unit Factor levels Low High Feed pressure P [MPa] 4.5 6.5 Drill diameter D [mm] 6 10 Drill hardness H [HRC] 60 90 Table 2 Mechanical and physical properties of MDF tested Tensile strength [N/mm2] Modulus of rupture [N/mm2] Elasticity modulus [N/mm2] Humidity % Density [Kg/m3] 0.8 28 2800 5-8 600-900 The delamination factor (Fd) is determined by the ratio of the maximum diameter (Dmax) of the delamination zone to the diameter of the hole [7].
The P value of last column indicates which item significantly affects the model.

Both the mechanical and electrical properties depend upon the material composition, strain degree, intermediate heat treatments and final annealing processes.
These factors strongly affect the phase proportion, microstructure morphology, precipitate volume, hardening level and filamentary distribution.
Mechanical properties The strength is dependent on the filamentary distribution and higher than the predicted value from a law of mixtures based on the properties of individual drawn phases.
The as-cast structure is one of determinant factors to the filamentary distribution and resultant strength.
These factors strongly affect the phase proportion, microstructure morphology, precipitate volume, hardening level and filament distribution.

Ferroelectric properties of sintered CaBi4Ti4O15 derived from mechanical activation have been studied.
Introduction Bismuth layer-structured ferroelectrics are of significant interest due to their high Curie temperatures, low fatigue and strong anisotropic electromechanical coupling factors [1,2].
Accordingly, the ferroelectric properties of CaBi4Ti4O15 are adversely affected by differential sintering among the aggregates.
Song, "A-site (Mce) Substitution Effects on the Structures and Properties of CaBi4Ti4O15 Ceramics", Jap.
Wang, "Effects of Mechanical Activation on the Sintering and Dielectric Properties of Oxide-derived PZT", Acta.

Many studies have shown that these factors affect the mechanical properties of the composites [5-12].
Impact properties.
This means that the difference in tobacco species does not have an impact on the mechanical properties of the composites.
Further investigation is needed for the effect of the patterns to the other mechanical properties.
Conclusion The mechanical properties of 3D-printed tobacco fiber-PLA composites were affected by infill pattern and fiber loadings.

This provides a valuable reference to the improvement of the mechanical properties or design of bearing materials in clinical orthopedic application.
At this time the crack will propagate in a non-self manner and hence the propagation of crack will be affected by the stress intensity factors of three crack modes simultaneously.
In clinical practice, the material properties of polyethylene cup are affected by gamma radiation used for sterilization.
As a conclusion, it is believed that the analysis results can provide a valuable reference to the improvement of the mechanical properties or design of bearing materials in clinical orthopedic application.
Bailey: Factors affecting near-threshold fatigue crack propagation behavior of orthopedic grade ultra high molecular eight polyethylene.

Microstructure and mechanical properties of Electron beam welded 5A90 Al-Li alloy Bo Lin1, a, Long Chen2,b and Donghai Cheng3 1AVIC Chengdu Aircraft Industrial (Group) Co., Ltd.
,China 2,3Nanchang Hangkong university , Nanchang of Jiangxi ,China aEthan_0211@126.com Keywords: 5A90 aluminum lithium alloy; electron beam welding; microstructure; mechanical properties.
In this paper, the 2mm thick aluminum lithium alloy 5A90 electron beam welding parameters， and the microstructure and properties of the welded joints have been studied.
The influence of welding parameters on the microstructure and properties of welded joints have been studied in order to optimize the welding parameters for the actual production 1.
When accelerating voltage constant, the line energy welding also increased with the electron beam increased, so the electron beam is one of the most important factors that impact the weld forming.