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Studied how the length of two resonance rods affects the resonance frequency.
Introduction Advanced ceramics are likely candidates for many industrial applications due to their superior properties.
In the ultrasonic machining environment, the location of node plane is determined to be the joint of between piezoelectric ceramic disks and front resonance rod to reduce the mechanical loss [3].
The material of piezoelectric ceramic disks should have lower dielectric loss factor, lower mechanical loss coefficient, higher electromechanical conversion coefficient and higher piezoelectric constant.
Firstly, assume that the materials are isotropic and uniform, and ignore the mechanical loss.

Orthogonal Cutting of Biological Soft Tissue with Single Cutting Edge Liying Gao1,a, Qinhe Zhang2,b, Ming Liu3,c 1, 2, 3 School of Mechanical Engineering, Shandong University, Jinan, China a gaoliying2008@126.com, b zhangqh@sdu.edu.cn, c 0102liu@163.com Keywords: Orthogonal cutting; Soft tissue; Cutting force; Force model; Blade Abstract.
It is well known that the cutting force is dependent on many factors, including material property, cutting tool geometry, and cutting parameter etc.
(5) From the above equation，soft tissue cutting force is affected by elasticity force, frictional force, and released force due to tissue fracture.
The frictional force is dependent on both contact area and friction property of the friction pair.
[5] Schwartz, J.M., et al., Modelling liver tissue properties using a non-linear visco-elastic model for surgery simulation.

This kind of model can effectively describe mechanical properties of incompressible material for hyper-elastic rubber under large deformation.
Initial position of crack and prediction of dangerous surface Owing to the special properties of rubber material, the deformation of rubber shock absorbers in the applications mainly reflected in the deformation of the rubber spring, and the deformation of metal parts is smaller.
Along with the load gradually increase, the self-contact of structure liable to happen, and the maximum strain which is beyond the scope of material properties lead to the result that the analysis is not convergence and the analysis force to terminate.
Based on the above analysis result, the region of rubber shock absorbers where the maximum main stress appear will be vulnerable to damage location in the process of actual using .There are many factors which affect the fatigue life of rubber components, such as the process of mechanical loading, vulcanization system, different reinforcement systems, work environment, different evaluation methods etc, and the actual destruction reason of the rubber shock absorber may be due to the compounded result of multiple loads.
Due to hyper-elastic properties of the rubber, it does not produce the plastic deformation.

In particular, PLA has good transparency, and some of its mechanical properties (such as Young’s modulus) are similar or even better than those of the most used polymers in packaging industries (polyolefins, PET, PS).
Finally, improved mechanical and gas barrier properties were obtained by Boufarguine et al. [13] on PLA/PHBV (90/10 wt%) films fabricated using a custom multilayer co-extrusion process.
Blending polylactic acid with polyhydroxybutyrate: The effect on thermal, mechanical, and biodegradation properties, Advances in Polymer Technology 2011, 30, (2), 67-79
PLA-PHA Blends: Morphology, Thermal and Mechanical Properties, European Polymer Journal 2012, 48, 1110-1117
PLA/PHBV Films with Improved Mechanical and Gas Barrier Properties, Macromolecular Materials and Engineering 2012

Introduction The austenitic stainless steel has been widely used because of its good mechanical characteristics like strength, ductility and corrosion resistance under the critical conditions.
The mechanical properties of STS316L steel given as follows; yield strength=267MPa, tensile strength=585MPa, elongation=67% and HRB=310.
When the same fatigue stress is loaded, because the factors such as small grain size, hardness and fracture toughness act as resistance factors at the stage I and II in the fracture mode, the fatigue crack growth is delayed more than BM.
From the result, big grain and ferrite band were shown to act as obstructive factors of the ultrasonic wave progress in welds [1-3, 5-7].
From the correlations between these factors, the attenuation factor α can be considered as a factor to reflect the constant m of the Paris equation, and longitudinal wave velocity V (L) and longitudinal wave center frequency f (L) can be considered as a factor to reflect the constant log C of the Paris equation.

In these four factors, the greatest impact on the removal of lignin is temperature, followed by is degumming time, then the concentration of alkali, and the bath ratio is the smallest.
It can be obtained from R value: RC>RB>RA>RD，so in the four factors, the greatest impact on the removal of lignin is temperature, followed by is degumming time, then the concentration of alkali, and the smallest is the bath ratio.
The mechanical force plays an important role in the whole process of fiber extraction.
In these four factors, the greatest impact on the removal of lignin is temperature, followed by is degumming time, then the concentration of alkali, and the smallest is the bath ratio.
The Effects of a Silane Coupling Agent on Curing Characteristics and Mechanical Properties of Bamboo Fibre Filled Natural Rubber Composites [J].

Introduction During the gear drive process, the contact force that the tooth cyclical meshing and collision generate is related to gear running smoothly, shock and vibration, fatigue wear, contact strength and service life performance and other significant properties, as well as provides a reference for the design of the gear transmission system.
So the contact force of involutes gear calculation is also affected.
According to the Hertz static elastic contact theory for the non-elastic contact, establishing the mechanical model[3-4].
As a result of gear manufacturing errors, installation error, friction and lubrication conditions and other factors, the phenomenon of the fluctuation within a certain range is allowed.
The stress analysis and motion simulation based on Solid Works [J] Mechanical Design and Manufacturing, 2008(1): 92-94

Several factors impair adherence, including loss of tensile adhesion strength and plate expansion due to moisture. 
It is commonly observed that after a few years of use the plates begin to loosen, thereby endangering individuals and properties.
Many factors hinder proper adhesion and are responsible for the development of pathological manifestations in the plasterboard, including inadequate filling of ceramic plates, loss of tensile adhesive strength, plate expansion due to moisture, and mechanical property differences between materials [3]. 
Other factors that could affect the characteristics of the materials were assessed by studying thermal characteristics using the classical heat transfer equations for semi-infinite solids considering a flow in the x-direction, without an internal source, and in a transitional regime. 
Failures in these operations can change the expected properties of the materials and, consequently, the lifespan of the external facade coating system.

Fatigue properties have also been evaluated for all test welds.
The effect of residual stress is discussed in relation to fatigue properties of all four welds.
Several factors influence the level of the residual stresses in the vicinity of the weld area.
It means that not only technological parameters or material properties but also metallurgical effects can influence the level and distribution of residual stresses.
These results confirm published observations that residual stress is one of the important factors which influence fatigue strength of high strength steels welds.

Experimental Research of Distributed Optical Fiber Sensor Monitors the Embankment Hidden Hazard Hua Lei1,a , Ping Yu Zhu2,b , Hong Qiang Liang1,c , Guo Qin Hou1,d 1Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201,Hunan Province; China 2School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou 510006, Guangdong Province; China alleihhua@126.com, bzhu.pingyu@gmail.com, cleung2013@126.com, dhgqhappy@126.com Keywords: Distributed Optical Fiber Sensor, Dams, Hidden Hazard, Bending Radius, Experimental Study Abstract.
Introduction When dam is during operation, it maybe show seepage, breaks and cracks, holes and other hidden hazards because of the damage of act of man, nature, organism and other factors.
Especially in dams monitoring of loose medium, sensor cable must be deal with by special process and with protective layer, the strain and temperature and bend radius of the optical fiber all will affect sensing properties of the optical fiber, so it is necessary to calibration by experimental test before the application.
This paper launches free strain and tensile test to understand strain sensing properties of the optical fiber.
This paper launches constant temperature and variable temperature test to understand strain sensing properties of the optical fiber.