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Research Progress on Mechanical Properties of Chinese Ancient Mortise-Tenon Joints Xiaosheng Song1, 2, a, Jingyu Su1, b and Xiaodong Guo1, c 1Beijing University of Technology, China 2 Hebei United University, China asong-xs@163.com, bsujingyu@gmail.com, cgxd@bjut.edu.cn Keywords: mortise-tenon joint, timber structure, ancient building, semi-rigid Abstract.
Therefore, to research the Mechanical properties of the joint is of great significance to the analysis of the overall structural performance of ancient wooden structure.
In this paper, recent advances on properties of the mortise-tenon joint of ancient timber building is reviewed in order to provide a reference for future related research.
Mortise-tenon joint is not a general sense of rigid joint, but showed semi-rigid properties.
Based on the 3-factor exponential function model, the 4-factor exponential function related curves model of M-θ is established, which is fit to the mortise-tenon joints of timber structure.

Results show that cold forming of foam material is restricted by many factors.
It offers a unique combination of properties such as low density, high stiffness, strength, and energy absorption capability.
At present most research about foam aluminum focus on the preparation technology, performance test, mechanical properties [3-7].
Foam aluminum has a good use value, but it is limited by the forming process and the physical properties changes.
[5] TianJie, HuShiSheng, Matrix properties influence on the mechanical behavior of foamed aluminum.

Introduction Viscoelastic properties include elastic and anelastic properties.
But many factors can affect the skin viscoelasticity, such as gender, specific location, hydration, PH value, relative humidity and different time periods.
He measured the mechanical properties of rabbit skin through two-dimensional stress device[3].
The method has been used to study effects of different factors on skin, such as aging, location, gender, etc.
Measurement of compressive or tensile in vitro as a classic, is an invasive measurement method, but it can accurately measure the various mechanical properties of skin, and provide a basis for skin closure, as well as a quantitative assessment of graft wound healing and scar formation factors; And comprehensive assessment on the skin can be carried out through inhalation method.

Since its discovery, a large number of researcher studied its rheological properties, adjusted mix design methods and analysed mechanical characteristics.
The rheological properties of SCC allow it to supply entirely and tightly a formwork of any shape under its own weight [7].
In this paper are evaluated the key factors affecting the cost estimate of concreting works: materials cost, the labour requirements, the formwork demands and the construction time.
Since its discovery was published a lot of researching concerning its fresh properties, mix design, mechanical characteristic.
[17] ERMCO (European Ready Mixed Concrete Organization), Guidance to the engineering properties of concrete, 2006

By using five different alkyl silane precursors, RSi(OR')3, to prepare the silica matrices, we have found that the R group influenced both the photochromic performance (e.g. response speed and optical absorption) and the fabric properties (e.g. durability to washing and abrasion, and fabric handle).
Also, epoxy groups have an additional crosslinking reaction, thus improving the mechanical properties of the crosslinked layer [9, 10].
Besides the mechanical properties and coating adhesion, durability to washing can be important for easy-care textile applications, and it is anticipated that this would be influenced by the pore size of the silica, the dye molecular dimensions, silica-dye interactions and the adhesive strength of the coating.
The washing durability was apparently affected by the mechanical strength of silica coating and its ability to retain the photochromic molecule.
The mechanical strength and delamination of photochromic silica layer could be the main factors affecting the washing fastness.

Straightening process is a nonlinear process, and affected by many factors.
But many internal or external factors may be the direct cause of deformation of metal bars.
In this study, an expert system is developed for the prediction of stroke for precision straightening based on the previous research. [1, 2] Straightening Technology of Expert System Straightening process is a nonlinear process, and affected by many factors.
But in the process of theoretical calculation, application of simplified calculation and the uncertainty of material properties would greatly limit the accuracy of the mathematical model.
The property of material and parameters can be obtained as follows: The elastic modulus E = 190089 MPa, yield stress σt = 382MPa, and span 2l = 200 mm, and the cross section is shown as Fig.6.

The purpose of the study is to compare quantitatively how the physical properties of the different suitable reducing agents will affect the development and design of a process to continuously produce titanium powder from TiCl4 in molten salt.
Design Considerations Some important factors affecting the design and operation of a continuous molten salt mediated titanium production process are: · Volumetric solids concentration · Vapour pressures of components in the reactor · Reducing metal solubility · Rate of reducing metal dissolution · Rate of TiCl4 absorption · Rate of reaction The effect of the choice of reducing metal on these factors is compared below.
In principle, it is (or should be) possible to estimate mass transfer rates from published correlations if the physico-chemical properties of the chemicals in the reactor, the reactor dimensions, and mechanical energy input to agitate the reactor are known.
Unfortunately only some of the physico-chemical properties are known with a reasonable degree of accuracy and the required reactor dimensions and the mechanical energy required to agitate the reactor are yet unknown.
Nevertheless, in spite of all these uncertainties, insight into and understanding of the issues affecting scale-up of the processes can be gained through estimates of the relevant rate processes.

Sealing property of threaded connection in gas storage wells is of great importance to the safety operation condition of CNG filling station.
Threaded Connection Leakage Test Factors such as material, structure, pressure affect the strength property of threaded connection[2].
Fig. 1 Tested points distribution in thread leakage test Finite Element Mechanical Analysis for Threaded Connection The contact end face of external thread is subjected to F under preload force.
The elastic deformations of both threads are: (1) (2) where is the thread angle in axial section, °; is the thread taper angle, °; , are the elastic deformation factors of internal and external threads; , are the elastic modulus of internal and external thread materials; is the unit force on the thread, N.
Firstly, the tested pipes have good sealing property in threaded connection.

Due to the multi-phase properties of composite material, its overall property is affected by a series of factors including single material characteristics, raw material content, geometric shape, composite method, interface status and complex extent.
Safety Factor.
However, as the wood residue fiber is relatively short, it can't meet the mechanical and other properties of sleeper material separately.
This program can significantly improve the flexural properties of composite materials, but can't decrease the effect of environmental factors on sleeper material's waterproof and anti-corrosion performance.
Moso bamboo-Chinese fir laminated composites and their properties.

On the assumption that random variables of affecting the stability of the crashing cavern obey normal distribution, and the reliability index()and failure probability()have established relationship.
Therefore, its reliability analysis should choose the reasonable model and the corresponding failure criteria based on surrounding rock properties and support type to establish the reliability limit state equation of underground engineering.
Limits balance equation of cavern reliability analysis The limit equilibrium equation of cavern stability based on reliability theory can be expressed as: （1） Where Z is the state variables cavern project system; G(x1,x2,…xm) is the state function of cavern system; xm is the factors variable influencing the the cavern stability.
Assumptions that affecting random variables of the cavern stability is normal distribution, so there is definite relationship to the reliability index ()and failure probability().
Beijing: Mechanical Industry Press, 1987.