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The results show that the main factors affecting the bearing capacity are steel pipe wall thickness, concrete strength, binding rebars in turn and the ductility is concrete strength, binding rebars, wall thickness.
Long or short rebars also significantly improve the deformation properties of specimens.
So the structure also can bring the mechanical property of concrete into play to maximum.
Once the constraint decreases, the mechanical properties of concrete itself will fully behave.
Influencing factors and level can been seen in table 2.

The research on the corrosion and its effect on the mechanical properties of reinforcing bar are increasing [6-8].
The samples have two sizes: short samples (Φ14mm×20mm) used for corrosion morphology observation, and long samples (Φ14mm×450mm) used for corrosion rate measure and mechanical properties tests.
The tensile mechanical properties, including yield strength, tensile strength and elongation, are tested by a hydraulic pressure universal testing machine.
For long samples, corrosion rate calculation and mechanical properties tests are made after they are immersed in thin hydrochloric acid to remove the scale on the surface.
These will affect the strength properties of reinforcing bar.

The behaviors of tuna purse seine during fishing operation are often affected by many factors such as currents, hydrodynamic force, vessel properties, engine power, and fish type, etc.
However, the inertial mass coefficient of net was always ignored, which might be a key factor to affect the sinking performance of a tuna purse seine in the sea water.
Mechanical Modeling The mechanical decomposition of forces acting on a mesh bar is as in Fig. 2(a).
The actual inertial mass coefficient of tuna purse seine under sea water might be affected by many factors (such as the density of netting materials, modulus of netting elasticity, sinkers and water currents).
Anyhow, the present study illustrated that the inertial mass coefficient was a key factor to affect the sinking and stability of knotless purse seine net under sea water.

The mechanical properties of porous scaffold can be optimized and greatly improved by adding a solid layer with a suitable thickness.
Furthermore, the mechanical properties of the porous structure should be guaranteed for load-bearing and stress conduction.
However, few reports have clarified the true effect of porous structures in terms of mechanical properties.
This paper aimed to clarify the effect of internal and external porous design on static mechanical properties and how they affected structure response and the way of stress conduction, so as to guide the optimum design of porous scaffold.
Analysis of factors influencing bone ingrowth into three-dimensional printed porous metal scaffolds: A review, Journal of Alloys and Compounds, 2017, 717:271-285

A factor affecting the hardness was the most PWHT temperature 550 ๐C and PWHT time 10 hr. of 279 HV.
The properties and weldability of these steels depend mainly on carbon content.
Mechanical properties were tested by vickers hardness following ASTM E92-82(2003) standard test method for vickers hardness of metallic materials [5].
The experimental design of full factorial design to be the main factors effectors affecting significantly.
Factors affecting the hardness are the most PWHT temperature 550 ๐C and PWHT time 10 hr. were hardness of 279 HV.

Studied properties are presented by means of water vapour diffusion coefficient, water vapour diffusion resistance factor and absorption coefficient respectively.
The natural pozzolana, namely natural zeolite (NZ), is used as supplementary cementitious material which affects the durability properties of the end product.
Many degrading factors are connected with the permeability of the material [1,2].
Water vapour transport properties.
Černý, High performance concrete containing lower slag amount: A complex view of mechanical and durability properties, Construction and Building Materials 29(6) (2009) 2237-2245

The research on the calculation methods and the influential factors analysis of the mechanical joint persistence ratio of jointed rock mass JianYun Chen1, a, XiWei Hu2,b 1Earthquake Engineering Research Division, Dalian University of Technology, Dalian 116024, Liaoning, China 2Room 404, Building 18, West Living Zone, Dalian University of Technology, Dalian 116024, Liaoning, China aeerd001@dlut.edu.cn, bhit_19870101@163.com Keywords: Jointed rock mass; Joint persistence ratio; Monte-Carlo; Joint network.
The Monte-Carlo method is employed in simulating the joint network of jointed rock mass based on certain principles, and the calculation method on the mechanical persistence ratio is studied, furthermore, some research on the influential factors on the persistence ratio is performed, and the values of some empirical parameters are obtained, which assured the stability of the results.
Because of the mechanical differences between joints and rock bridges, we must consider the mutual affects of joints[1].
As in the rock, the distribution of joints is extremely complex, the early studies considered that determining the persistence ratio of rock was almost impossible, with the development of computational science in the field of rock mechanics, formed a Monte-Carlo method to simulate the joint network of rock gradually, and then we can study the mechanical properties of the rock mass.
(2)As can be seen from the results above, we should determine certain values of the simulation times, model size, projection width when we calculate the mechanical persistence ratio, and there’s little influence of the assumed average normal stress, but we don’t know the influence of some of the other factors , such as the inhomogeneity of the assumed average normal stress etc.

And then we study the excellent mechanical property of the carbon nanotube fibers.
Introduction Carbon nanotubes (CNTs) are an extremely interesting type of material due to their unique structure, and their excellent mechanical, thermal, and electrical properties.[1-4] Many promising applications have been demonstrated.
The mechanical properties of the aligned CNT fibers were characterized by a Shanghai Hengyi Testing Instrument.
Generally, affecting the carbon nanotubes fiber strength factors include wall number, diameter and length of carbon nanotubes, internal orientation, defects and the content of impurity of fibers.
These CNT fibers exhibit excellent mechanical properties.

Composites; Mechanical Properties Abstract.
The , k, of each factor were calculated according to the tensile strength and impact strength, thereafter, the pictures of k plotted to factors and levels were drawn.
It can be seen from table2, table3, picture2 and picture3 that the important order of relevant factors that affect tensile strength and impact strength is: treatment temperature(C) > PA amount (A) >ultrasonic treatment time(B).
However, further prolonged ultrasonic pre- treatment time can exert negative effects on the modification, it is because too long a ultrasonic mechanical treatment time reduces the strength of fiber, leading to an inferior mechanical properties of composites.
Picture 2 Effects of factors and levels on the tensile strength indicates Picture 3 Effects of factors and levels on the impact strength indicates Conclusions PA was used to modify the fiber reclaimed from old newspaper under the condition of ultrasonic radiation and the treated fiber was mixed with PLA to get the composites, whose mechanical properties were tested later.

If leakage, cracking, explosion and other accidents occurred, it will easily lead to major casualties and property damage, affecting public safety and social stability.
So, the safety of CNG cylinders has become a key factor affecting the healthy development of CNG cars.
As we know, the quality of materials, including mechanical properties, physical properties, chemical propertie, is directly related to the life and safety of components, devices or articles.
Tensile properties.
Mechanical properties of the two Cr-Mo steels Fig 2 Mechanical properties of the two Cr-Mo steels (a) Rockwell hardness (b) Tensile properties Fig.2 displays the mechanical properties of the two Cr-Mo steels.