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This research aims to provide theoretical proof for the further study on the factors of stress relaxation under different conditions.
Some researchers have studied the viscoelasticity of wood: Fushitani [3, 4] studied the stress relaxation of swelling wood, and thought that temperature was one of important factors affected wood stress relaxation; Bonefied [5] studied the wood under tensile stress relaxation and Rawat [6] studied compression stress relaxation of wood; Backman and Lindberg [7] measured the dynamic viscoelasticity of Pinus sylvestris L. in radial direction and tangential direction.
So it plays a key role in rheological property [8].
Because of different materials and formative conditions, early and late wood must have different physical and mechanical properties.
Summary This research aims to provide theoretical proof for the further study on the factors of stress relaxation under different conditions.

Introduction Optimal design can improve the mechanical properties of components and obtain the best size of the structure.the structure approximately saving materials 30% through the application of optimal design method, so that optimization of design technology gain people's highly attention.
How to optimize the mechanical components reasonably,its detailed analysis process is shown in figure1.
As the above box template for original model to finite element analysis, and adding material, element properties, boundary conditions,and solution, related graphics obtained as follows fig.2: Fig. 2 the figure of axial stress deformation and radial stress deformation for spindle box Through calculation and processing,we will obtain different conditions (size) model, all data of that will be used as the design constraints for optimal design, and the calculation variables of sensitivity analysis.
Fig. 4 optimized spindle box Conclusions Due to the complex components, more inner reinforcing plates and holes on the box which is not completely symmetrical,so the systematic and regular parameter drive has not setted for all size, which has brought lots of inconvenience during the sensitivity analysis and the optimization. there are also man-made factors, missing design variables leading to the error.
Mar. in chinese [4] Lai Yi-nan, You bin-di, Song Yi-xin, Fuzzy finite element optimization of complicated mechanical struc [J].

One of the factors determining the possible applications of Zn-Al-Cu alloys is their resistance to electrochemical corrosion.
The addition of aluminum increases the castability, reduces the grain size and improves the mechanical properties of the alloy [1-5].
Adding copper improves the mechanical and tribological properties, increases the tendency to spontaneously age and increases the density [5,6].
Due to their tribological properties, these alloys are used as an alternative material for bronze and aluminum alloys.
Monoeutectoid zinc alloys are characterized by higher mechanical strength and wear resistance than the eutectic and eutectoid alloys in both the as-cast and heat treated conditions [8].

New Trends and Technologies in Thin-Slab Direct Rolling: Improved Microstructure & Mechanical Behavior C.
To obtain optimum strength and toughness property combinations in a direct rolling process, hot rolling has to compact the dendritic as-cast microstructure and to achieve a fine-grained microstructure.
Introduction Typical features of the CSP® process are homogeneous structural and mechanical properties all along the strip.
This influence has been quantified considering the evolution of the multiplying factor affecting t0.5, this factor being equal to unity for plain C-Mn steels.
Above equations clearly show that, for a given chemical composition, the time, the temperature and the applied strain level are the main factors controlling the degree of recrystallization between subsequent passes as well as the occurrence of precipitation.

Spider silks have excellent mechanical properties, which can even compare with some high-performance synthetic materials.
Although as reported, the impressive mechanical properties are closely related to the primary amino acid sequence, the conformation that molecular chains form is also an important determinant.
Introduction The study of spider silk has been focused in the polymer material area during the recent 20 years with its remarkable mechanical properties, expected to be utilized as the perfect material of bulletproof helmets, ballistic protective clothing and other industry supplies[1,2].
Besides the three factors, alkali metal ions also have an influence on the conformational transition which will be discussed in the further research.
Weber, et al, Silk properties determined by gland-specific expression of a spider fibroin gene family, Science 272(1996) 112-115

The effects of these ternary additives on the densification behaviors and mechanical properties were investigated.
Introduction Silicon nitride (Si3N4) has been applied in many areas due to its superior synthetical property such as high-temperature character, good mechanical properties, and superior erosion resistance [1,8].
With nano boron nitride powder made by deoxidization-nitrification method, Si3N4/BN, or SiC/BN composite ceramics with good mechanical and machinable properties were prepared by hot-press sintering.
Mechanical Properties.
Sekino, et al: Mechanical properties of Si3N4/BN composites by chemical processing.

Interfaces and properties of advanced materials V.
Introduction The properties of materials are affected to a large extent by the internal interfaces.
The interfaces are both sources and sinks of point defects as vacancies or imperfections and affect thus the properties sensitive to such defect concentrations.
It determines morphological stability of layers essential for the production of electronic devices and plays a crucial role for the mechanical properties as well.
Moreover, in addition to these extrinsic parameters, the intrinsic factors describing unequal boundary atomic structures such as a relative translation of the two grains has to be considered.

Research on the Modeling of Metal Material Properties Based on Logistic Model Zhang Shiyu a, Li Xilingb Beijing Union University, Beisihuan East Road 97#, Chaoyang district, Beijing, China 100101 a gltshiyu@buu.edu.cn, b gltxiling@buu.edu.cn Keywords: logistic model, mathematical modeling, metal material properties, hardenability Abstract.
While we can not explain the principle of the mechanism of the various factors, but a large number of experimental data has good stability, indicating that this statistical model to reflect the characteristics and laws of a certain nature of things.
In this paper, authors attempt to apply logistic model in the research area of metal material properties.
It can be seen in Table 3, which the coefficient of determination R2 is 0.98, identifying that affecting factors interpret the total variation scope .
[8] Mechanical Engineering Manual ( Volume 3 ) , submitted to Mechanical Industry Press, Beijing 1982.9 [9] Socio-economic statistical principles, China Statistics Press, Beijing ,1980,p490

Abstract: The performance of a tunnel is influenced by such factors as the size and shape of the opening, the in-situ stress and the deformation field and also properties of the rock mass.
The numerical results indicate that the mechanical index is different due to variant excavation plans and an optimized plan is determined based on the comprehensive analysis of the index gained from the simulation results.
This paper attempts to demonstrate how the excavation procedure affects the tunnel performance using flac3D.
However, the determination of the best excavation procedure should take consideration of many factors such as the horizontal displacement of straight walls, the uplift of the bottom and energy release rate.
Further research work should be done taking account of the other factors in order to make the most rational decision.

The biomedical metal materials obtain the widespread application in the clinical treatment of bone injuries after a long-term research and clinical screening. the effect of Material properties on Implant mechanics, Bone locking plate with ordinary steel mechanical properties, Material implantation on mechanical effect were analyzed in this study.
The Clinical biomechanics properties and therapeutic effects of metallic material were influenced by their properties, forging process and clinical methods of implantation.
The Biomechanical Characteristics of Bone Metal Materials The mechanical effects of material properties for implant: there are so many kinds of medical metal materials, different materials have different material characteristics and mechanical properties, the following is the metal material properties or biomechanical performance of bone injury (see table 1).
The mechanical effect of material implantation The length of the plate and the distribution of screws are the key factors for the stability of fixation.
Some study results show that, the bone biomechanical properties have a constraint effect on the fixation of bone, blood supply for bone and the growth of bone cell, while the properties of metal materials, forging process and the method of clinical implantation etc. play an important role on the biomechanical properties and therapeutic.