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Introduction Knowledge of the stresses developed within the ceramic femoral head is of prime importance since they can affect the outcome of total hip replacements [1].
Model material properties Material Young's Modulus [GPa] Poisson's Ratio Ti6Al4V 115.00 0.28 Alumina 380.00 0.22 Long tapers were used to present the "worst case " scenario with respect to the peak stresses developed within the femoral head and male taper.
One important mechanical consideration that is not taken into account by the BC 2 conditions is the flexural rigidity of the male taper.
There are many other factors (boundary conditions) not taken into account in this study, such as other muscle forces across the hip joint other than the joint reaction force used, the application of the femoral head to the male taper (whether it was" put" on or" impacted" to the male taper), the corrosive biological environment and the fatigue characteristics of the materials modeled.
The application of the appropriate boundary conditions including complex material property behavior to the FE models may help in predicting the stress fields and optimizing future designs.

As the key part of the motion posture and trajectory control of unmanned systems, its performance directly affects the performance and safety of the motion control system.
Refer to fatigue, if the loading history, boundary conditions and material properties are known, the stress and strain analysis of the established virtual geometry model can be conducted through the finite element method, and then based on the stress and strain, the fatigue life distribution in the virtual model can be obtained through life analysis combined with the corresponding fatigue theory. 1 Several methods of fatigue life prediction S-N nominal stress method is an empirical method which takes alternating nominal stress as the main parameter to predict the fatigue failure cyclic number (total lifetime).
It points out that the fatigue crack propagation of metal materials is mainly controlled by the range of the stress intensity factor.
Currently, a large number of crack propagation rate curves of engineering material are obtained, and the stress intensity factor solutions of various components with cracks are established, so these theories are widely used in engineering.
The typical ones are such as multiaxial fatigue, thermo mechanical fatigue, frequency domain fatigue, welding spot and weld bead fatigue, corrosion fatigue, composite fatigue, contact fatigue and so on[2].

Collagen belongs to the proteins family [10, 15] and has especially stable structure giving great mechanical properties.
Variation of the three groups of parameters that is: 1) processing parameters, 2) solution properties and 3) environmental condition parameters, is a way to affect electrospun product morphology.
Fibres produced by this process have higher crystallinity leading to better mechanical and structural properties important for scaffolds mechanical integrity [65].
Tee, et al., Structures, mechanical properties and applications of silk fibroin materials, Prog.
Ramakrishna, Mechanical properties and in vitro behavior of nanofiber–hydrogel composites for tissue engineering applications, Nanotechnology, 23 (2012) 095705

INTRODUCTION Structural reliability of composite materials can be strongly affected by the fracture toughness of interface between two constituents.
The failure of interface is inherently a mixed mode problem, particularly when crack is constrained to grow along the interface because of the mismatch of material properties across the interface.
Material properties used in analysis are listed in Table 1.
Material properties Material Young’s Modulus E(GPa) Poisson’s ratio � Epoxy 1.97 0.33 Glass 68.95 0.20 Dundur’s Parameter : � = -0.9402772 � = -0.2349565 Bimaterial constant : �= 0.07621267 +u 10 10 a ,µ2 2� 150 NC O D �µ ,1 1 r � X2 o G LASS U nit (m m ) EPO XY o+v 1X Fig.1.
Once the complex stress intensity factors were found, Eq.3 and Eq.4 were used to determine mixed mode interfacial fracture parameters, such as mode mix, �, critical energy release rate, CG , during crack initiation.

These data could help to predict the physical properties of materials.
These data can help to predict the mechanical properties of materials directly.
The magnitude of reflectivity would directly affect the absorptive energy of work piece from laser.
The heterogeneous rate includes the correction factor f(θ)=[2-3cos(θ)+cos3(θ)]/4.
The thermal properties used in this calculation are derived from Ref. 9, 16 and 17, in which the temperature dependence of the thermal conductivity and specific heat is considered.

Austenitic stainless steels are found to be efficient engineering materials with excellent mechanical properties which highly suitable for making of different industrial components [2, 3].
Ramachandran, Effect of friction stir welding on mechanical and microstructural properties of AISI 316L stainless steel butt joints.
Lakshminarayan, Enhancing the properties of friction stir welded stainless-steel joints via multi-criteria optimization.
Mechanical properties of AISI 316L austenitic stainless steels welded by GTAW.
Effect of TIG welding and manual metal arc welding on mechanical properties of AISI 304 and 316L austenitic stainless-steel sheets.

Interfacial properties between tie and barrier layers have been investigated.
Introduction Multilayer films can be obtained by coextrusion process to combine several polymer layers with complementary properties.
Tie-layers are therefore employed to enhance optical and mechanical properties of the films.
Rheological properties of polymers have been studied in linear viscoelasticity.
Fig. 2 Linear viscoelastic properties of polymers at 230°C, (a) mastercurves of complex viscosity and (b) weighted relaxation spectra A contrast of rheological properties between barrier polymers and polyolefins was evidenced from these results.

Theory Study and Numerical Analysis of Ultra-thin Wall Injection Molding Sufeng Yin 1,2,a, Feng Ruan 1, Jianyu Wang 3 , 1School of Mechanical & Automotive Engineering.
Using the method of numerical simulation and experience, the article verifies the consistency of experience result and the change of the factors, such as using ultra-thin viscosity model, wall-slip and the change of heat transfer coefficient while doing the simulation.
Base on the experience of producing ultra-thin Light guide plate, the thesis focuses on studying the main influence factors which differ from macro melt flowing and are caused during the injection molding.
In order to obtain ht expression, divide the heat transfer coefficient into two parts: one does not affected by temperature f(v,l), h(θ) and one does
A number of micro factors on the impact of filling are worthy of further study, especially the changeable function of micro-factors.

Through data analysis, study the response of tourism interference on soil physical and chemical properties.
The research work carried out for the prairie tourist area is less, while the grassland ecological environment is very fragile and tourism interference becomes important factors.
Case study area should be able to cover most of the properties of tourist area in the same type, which can choose to study as the research object to statements common properties in the area.
Soil mechanical composition is not selected to study the changes of its physical properties in this paper.
The interference degree varied from near and far, but little change of its chemical properties.

Table 2 shows experimental results of tensile properties.
Similarly, the anisotropy of mechanical properties is calculated by: ⊿r=( r0 +r90-2r45)/2.
The urethane pre-coating produced different changes in mechanical properties, namely, a significant increase in proof stress and a minimal change in elongation.
The kinetic viscosity of Mu-19 (Mu) is 22.3 cst. [3] GG has the best lubricating properties.
Punch diameter dp φ40 Punch profile radius rp 8mm Clearance 20.0% Die profile radius rd 3mm Hold-down force 1kN Punch velocity 100mm/min Table.2 Mechanical properties of specimens.