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In this paper, the basic properties and degradation properties of Poly(3-hydroxybutyrate- co-4-hydroxybutyrate) [P(3HB-co-4HB)] with different 4-hydroxybutyrate (4HB) molar fraction were investigated.
By solvent coating method to measure the basic performance, while by melt molding method to measure mechanical properties.
Mechanical properties.
The mechanical properties used the CMT4503-type universal electronic tensile machine by Shenzhen Xinsansi Material Co., Ltd.
(a) (b) (c) Fig. 1 (a) First heating curve of PHB and P(3HB-co-4HB) copolymers ; (b) Cooling curve of PHB and P(3HB-co-4HB) copolymers; (c) Second heating curve of PHB and P(3HB-co-4HB) copolymers Mechanical properties of P(3HB-co-4HB).The mechanical properties of different 4HB molar fraction of P(3HB-co-4HB) are shown in Tab.1.

Introduction There are a number of factors affecting the electric resistance of conductive aluminum alloys, such as the content of alloying elements and impurities, alloy defects and lattice defects, and material processing states, etc.
Table 2 Factors and their levels designed in orthogonal hardness test Factors T1 / oC t1 / h T2 / oC t2 / h Levels 1 100 1 180 1 2 120 3 200 3 3 140 5 220 5 Mechanical Property and Electric Conductivity Testing.
Wang, Effect of Ce addition on castability, mechanical properties and conductivity of Al-0.3%Si-0.2%Mg alloys, Int.
Wang, Effect of Ce addition on castability, mechanical properties and conductivity of commercial-purity aluminum, China Foundry 12(4) (2015) 277-284
Vietz, The basic processes affecting two-step ageing in an Al-Mg-Si alloy, Philosophical Magazine, 16(139) (1967) 51-76

The article analyzes the influence factors of the thermal elongation.
From the above assumptions, heat conduction problem of the ballscrew hard milling process is 3-d transient heat conduction problem which belongs to Constant physical properties and no internal heat source.
Analysis of simulation results Milling heat and convection cooling is the main factors that affect the ballscrew temperature distribution, At the same time, the screw temperature is also affected by other factors, such as thermal conductivity between the ballscrew and support, screw and chuck, the local forced convection cooling near rapidly rotating milling cutter head in processing, etc.
The diameter of screw, the ambient temperature of the milling machine, the cooling method and the initial temperature of the workpiece are also important factors to affect the ballscrew temperature distribution.
In this paper, study the three-dimensional temperature field equation of the Whirlwind milling ballscrew based on Heat Transfer , and determine the boundary conditions; establish the ballscrew model Using ANSYS, load heat source along the screw helix, calculate the temperature distribution simulation results of the processing ballscrew, analyze the factors affecting the temperature distribution.

The aim of this work was to investigate the contribution of the factors governing the deformation and transformation process of conditioned austenite.
Microstructural characteristics of the retained austenite such as morphology, grain size, carbon enrichment, and also the presence of bainite volume fraction can considerably affect retained austenite transformation kinetics, work-hardening rate and thus the final mechanical properties [4, 5].
On the other hand, in multiphase structure, achievement of mechanical properties does not depend just on the retained austenite fraction.
It is obvious from the stress-strain curves (Fig. 5) that the samples D, E, F have different mechanical properties, despite rather similar content of present phase constituents, particularly the retained austenite).
It is well known that mechanical properties of TRIP steels strongly depend on the microstructural composition.

During cure the main factor affecting composite quality is the external pressure applied to the laminate.
Research conducted by Liu et al. explored the effects of cure cycles on void content and mechanical properties of composite laminates.
DTA Technical Note - Factors affecting void content and compressive strength of carbon epoxy structures, Defence Technology Agency, New Zealand, 3/2009
"Effects of Cure Cycles on Void Content and Mechanical Properties on Composite Laminates."
"Effects of Cure Cycle Pressure and Voids on some Mechanical Properties of Carbon/epoxy Laminates."

However, the great potential of PPy is limited to its poor mechanical properties.
While more work was put emphasis on the electrical, magnetic and optical properties, much less research had done about the mechanical properties of polypyrrole film.
The disposal of substrate is also a crucial factor to the mechanical properties.
It will also affect the mechanical properties.
(4) The nodules and the holes seen by SEM affect the mechanical properties.

Mechanical properties are very important, because determination of these properties is necessary for structural analysis and reliability evaluation of the electronic packages.
Measurement of the Young's modulus is complicated by several factors such as the limited region of elastic behavior, microstructure of material, variations in cooling rate, micro porosity in the solder, and so on.
To examine effects of microstructure on mechanical properties, cooling rates had been controlled to acquire different microstructures of solder materials.
Young's modulus of solder materials were measured by nanoindentation tests and other elastic properties had been acquired by mechanical tensile tests.
As the cooling rate decreases, Sn-rich phase grows and elastic properties approach to the properties of pure Sn.

The effect of temperature on the mechanical properties of the samples after sintering is significant.
The formation of a large number of sintered necks should be developed to determine its mechanical properties.
In the sintering process includes three stages, grain growth stage, grain boundary expansion stage, pore change stage, the main factors affecting the sintering temperature and holding time, sometimes the sintering atmosphere will also affect the microstructure of the ceramic in the process.
The effect of temperature on the mechanical properties of the samples after sintering was significant.
Jiang, Unique mechanical properties of nano-grained YAG transparent ceramics compared with coarse-grained partners, Mater.

So far, there are several empirical equations can be used as the constitutive equations to describe the rheological properties of yield – pseudoplastic.
Orthogonal experimental design and analysis of result 1.Optimization experiment of additive and abrasive concentration Concentration of the additive in abrasive suspension jet is the key factor that affects rheological flow properties.
Thus, we first carried out optimization test about additive concentration and considering various factors, we select additive concentration of 0.35%.
Experimental factors level table shown in Table.
Table 1 ,Experimental factors level Grade preture(MPa)A Cutting speed（mm/min）B Target distence（mm）C 1 15(A1) 100(B1) 2(C1) 2 20(A2) 200(B2) 4(C2) 3 25(A3) 300(B3) 6(C3) 4 28(A4) 400(B4) 8(C4) We use the L16 (45) orthogonal table (table details omitted), the data from the table was calculated the table about analysis of range, which the maximum range was 35.3mm (produced by the B factor), and according to the calculation to draw the diagram about relative factors, as shown in figure 4.

Another drawback of using natural fibres is that their final properties will depend on their composition as well as on agricultural and processing factors.
Bacterial cellulose, which has a diameter of around 20nm, exhibits excellent mechanical properties.
To study how bacterial cellulose affects the properties of loose flax/polypropylene composites, a set of experiments was conducted.
It was found not to affect the tensile properties of the composites, although further investigation into how annealing affects these composites and a pretemperature (used to allow hornification) influences the properties is needed.
Even though no improvement on the mechanical properties after adding bacterial cellulose was detected, the handling of the preforms was improved.