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But most of natural biological materials, the mechanical properties are poor and cannot maintain an appropriate shape after implantation.
These polymers can be tailored to produce a wide range of mechanical properties and degradation rates.
In contrast, when PLGA concentration was too low, the mechanical properties of scaffolds will become poor.
It will be affected that how much cell quantity the scaffold can load and how long the biological material degeneration produce will be, and mechanical properties of scaffold.
It is the most important thing that can keep biological properties of materials from affected.

For increase cutting tool durability is necessary maximally possible elimination of these factors.
All these factors of cutting tools are the only consequence of these cutting tools durability.
Cutting tool durability determines its cutting properties and machinability [2, 6].
Material for workpiece is from specific material list with guaranteed chemical structure and mechanical properties, see Tables 1 and 2.
The manufacturing process is affected by a large number of factors which are in the testing laboratories optimized and do not operate on a given process and therefore do not affect the results of such experiments are compared with the practice of heavily distorted.

The factors and their levels were selected based on preliminary experiments.
RSM establishes the correlation between controllable factors and desired response.
The following conclusions are drawn within the ranges of the factors selected
Eriksen, The Influence of surface roughness on the mechanical strength properties of machined short-fibre-reinforced thermoplastics, Composite Science and Technology. 60 (2000). 107–113
Machaly, Factors affecting the machinability of GFR/epoxy composites, Composite Structures. 63 (2004) 329–338

Mechanical recycling involves breaking down CFRPs by shredding, crushing, milling, or other similar mechanical processes, but can produce only short milled fibers with poor mechanical properties used as filler or reinforcement materials [4].
Fluidized beds [6] can operate at high temperatures in an oxidizing atmosphere to produce clean, resin-free fibers, but cause a reduction in mechanical properties.
Mechanical Properties of Recycled CFs.
It is essential to investigate mechanical properties in-depth.
Temperature is the main factor affecting the tensile strength of recycled CFs.

Creep crack initiation and growth properties are also affected by multi-axial stress and it is important to evaluate these effects when laboratory data are applied to structural components.
In order to investigate the effects of multi-axial stress on creep crack growth properties, the tests were conducted for various notch depths at 650°C.
Creep crack growth properties could be predicted by allowing for the decrease of creep ductility under multi-axial conditions.
Creep crack initiation and growth properties are also affected by multi-axial stress [4-6] and it is important to evaluate these effects when laboratory data are applied to structural components.
The evaluation of fracture mechanics parameters and the effect of multi-axial stress on crack growth properties are discussed.

Whalley, and the influence of such factors as the stiffness, etc. of feed system on the feed quantity of feed system worktable was verified[1].
In the literature[5] and [6]，the dynamic model of machine tool linear guide joint with ball screws was built, and main factors influencing the vibration of ball screws and stage were analyzed, which provided theoretical basis for the increase of position precision of feed system[5,6].
In addition, the material properties in the modal analysis must be linear, isotropic, so such linear features as elastic modulus and density of a material must be specified, and the nonlinear material properties must be neglected.
(3) Definition of material properties: the material properties of each part of ball screws linear guide feed unit are as follows: elastic modulus, Poisson's ratio, density, material damping
Chinese Journal of mechanical engineering, 2010, 46(1), pp.92-99.

The materials with excellent mechanical properties and weldability have been widely used for petrochemical plants and nuclear industry.
A weldment consists of three zones from the material's micro-structural viewpoint: weld metal, heat affected zone (HAZ) and base metal, and each exhibits different mechanical and fatigue behavior.
Recently, researches revealed that fatigue crack growth was affected by microstructure for some material in Paris region [5-7].
The mechanical properties at room temperature are tensile strength σb = 585 MPa, yield strength σ0.2=370 Mpa, and elongation to fracture δ= 26%.
That predicate the maximum intensity factor at the crack tip is restricted [8-10].

Study on Mechanical Property and Strength Formation Mechanism of Red- mud & Fly-ash Aerated Concrete Ruiyan Wang1, a, Lanfang Zhang1,b 1 Department of Material, Chongqing Jiaotong University, Chongqing,400074, China awangry@cqjtu.edu.cn, b yyzhanglf@163.com Keywords： Red Mud; Fly Ash; Aerated Concrete; Linear Relationship Abstract：Red mud is the waste which is generated in the process of extracting alumina from bauxite.
The ratio of powder and water effects on the aerated concrete is mainly manifested in two aspects: One direct impact on resultant microstructure of the hydration density, which impact on the pores wall strength; On the other hand, slurry consistency was significantly affected, thus affecting the bubble size and bubble spacing factor inside the paste, thereby affecting aerated meso pore structure and strength of aerated concrete.
Relationship between strength and influencing factors can be expressed as Eq. 1: f=-206.195+2.103602C+2.037753 RM+2.019476 FA+2.172341 AD-19.5346 Al+2.810023 P/W (1) （2）Strength of red mud ﹠ fly ash aerated concrete is mainly from calcium silicate hydrate gel and ettringite.
The two factors are very important to strength and density of aerated concrete（4）Aluminum powder content has direct impact on the porosity of aerated concrete, thus affecting the density and strength of aerated concrete

There are many factors affecting the paper breaking length.
This paper is study on the effect of ozone bleaching time on physical properties of paper by measuring the paper breaking length with different bleaching time.
The average length of the fibers is an important factor affecting the tearing strength.
This experiment by measuring the different bleaching time of the KMnO4 value of the pulp, speculated that the effect of ozone bleaching time on the removal of lignin in the pulp, and further integration of other factors to obtain the best length of bleaching.
Jiang, Comparative papermaking properties of oil-palm empty fruit bunch, TAPPI J. 84(1) (2001) 5

In the Northeast cold region, the concrete structure with direct contact or indirect contact with seawater or similar things such as salt lakes, saline soils, etc. will generally be affected by double factors of freeze-thaw cycle and salinity corrosion pairs.
Freeze-thaw cycle, and saline media penetration as two factors to affect each other mutually and intensified will induce reinforcement corrosion and seriously affect the performance of concrete structure in service time and lead to its degradation performance.
However, most of the existing studies are on the changes of durability in the materials of steels or concrete themselves by a number of factors, which the study on anti-corrosion and frost resistance of concrete structure is still at the exploratory stage[1], especially the study considering the effects of steel corrosion and concrete freeze-thaw at the same time to the durability of reinforced concrete structure is almost in blank.
In this paper, different tests have been made on different degrees of freeze-thaw cycle and reinforcement corrosion in concrete structure to find out the affecting law on mechanical properties of concrete structure, and the test data have been analyzed and sorted immediately.
On other mechanical properties of concrete structures under freeze-thaw environment, some further studies are needed later.