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The influence of the fixed stress amplitude on properties of liner/propellant was also studied.
Long-term environmental exposures affect a missile’s performance and reliability as component material properties degrade, and this degradation negatively impacts critical performance parameters.
The interface property of liner and propellant is the main factor to affect the work of solid rocket motor.
This is because solid propellants possess a number of specific properties which can significantly affect the material's fatigue mechanism.
[6] Yin Hua-li and Wang Qing-he., “Factors of influencing the bond characteristics at interface”, Journal of Solid Rocket Technology, vol. 21, Jun. 1998, pp.40-46

Shear stress, strain and stress intensity factors were analysed around the fillet using FEA.
Next, the mechanical properties of the material standards will be entered into finite element analysis using FEMAP software.
The mechanical properties of AISI 420 material are shown in Table 2.
Mechanical properties of AISI 420 [21].
τaσBsf1xsf2=57,47MPa (2) Analysis of the stress and strain, stress intensity factors using a finite element method.

However, the frequency of the plants watering normally is affected by several factors such as weather conditions, maturity of the plant, species and soil types.
When the root density is high, roots and soil create a complex system that can be considered as a new matrix that works as a unique phase in which soil and roots properties cannot be well distinguished [6].
Osman, Soil-roots composite: Correlation between shear strength and some plant properties.
Ali, Use Of Vegetation For Slope Protection: Root Mechanical Properties of Some Tropical Plants.
Pull-Out and Tensile Strength Properties of Two Selected Tropical Trees.

In many cases, the parts are under serious load, high heat load and surface defects caused by electrical discharge machining, become the main factors of part performance.
Properties of workpiece material material density Specific heat capacity thermal conductivity Melting point 45 steel 7833 448 70 1515 Fig.1 Schematic diagram of surface morphology experiment Fig.2 The workpiece surface topography As for the pits formed by the melting of splash erosion (as 1 shown in figure 2 and) , the discharge area is very small, the instantaneous current density in the discharge path is great.
Micro cracks and micro holes can seriously affect the workpiece bending strength as well as the service life of the workpiece [6].At the same time, in the region of the heated but not melted , the physical and mechanical properties of artifacts will be affected to a certain extent.
Fig.5 The morphology of carters in different eletrical parameters Conclusion (1) Pits formed by the single pulse effectively discharge determined the final features of the surface morphology, but also determined the surface quality and mechanical properties of the workpiece
Int J Manuf Technol, 2004 [2] Liu,J.C., Zhao,J.Q., Special ProcessingBeijing: mechanical industry press, 1999 [3] Y.H.

Finite Element Analysis of ROPS with Energy-absorbing Structure for Engineering Vehicles SuLi Feng 1,a , QiuJu Zhang 1,b and ZhiGang Tian 1,c 1Changchun Institute of Engineering a416946128@qq.com, b78660509@qq.com, c582072498@qq.com Keywords: Optimized; finite element analysis; generic algorithm Abstract This article addresses the design of ROPS model with energy absorbing structure based on dimensions of cross-section, mechanic properties and deformation pattern of ROPS.
In this article, a buffer and energy absorbing element has been designed based on mechanic properties and deformation pattern from energy absorption point of view while addressing multi-objective optimization of its structure. 1 Design for ROPS and its buffer and energy absorption elements Design for ROPS and its buffer and energy absorption element would need comprehensive consideration to be taken into mechanical properties of sides and top of ROPS.
Based on mechanical properties of ROPS as analyzed above, series of thin-walled energy absorbing tubes of rectangular sections will be arranged at top and sides of ROPS beams.
Thin-walled straight square tube model has been designed based on cross-section of ROPS, mechanical property and deformation pattern.
Factors Affecting the Finite Element Simulation of a ROPS Test of a Volvo Cab[D].

Introduction Epoxy resin (EP) has the excellent characteristics of chemical resistance, toughness, low shrinkage on cure, and mechanical resistances properties [1].
Polyamide-imide (PAI), which is a kind of thermoplastic resin，has good heat resistance，dielectric property，mechanical property and chemical stability[2]．Recently, one approach involves the preparation of PAI-EP composite resin, which exhibits good wear-resistance and heat-resistance [3].
Because different heating rate of resin system affect the maximum temperature of DSC curve obviously, the method of non-isothermal temperature curing DSC is often used in thermal analysis [4,5].
Fig.1 shows that the unique exothermic peak controlled the whole curing course of Polyamide-imide-epoxy resin system, and different heating rate can affect the shape of curve, curing temperature, and the heat of cure reaction of resin system.
The frequency factor A was connected to the molecular collisions will increase when reaction temperature rise.

The material selection must not only have good comprehensive mechanical properties, but also have good weldability, machinability, and so on.
The chemical composition is shown in Table 1, and the mechanical properties are shown in Table 2.
Crack resistance and mechanical properties.
Solderability Test and Results Welding Test Piece Ggrouping and Numbering.In order to compare the mechanical properties of WELDOX1100 high strength steel welded joints with different preheat temperatures.
Structure and Properties.21 (2004) 132-136

Many external and internal factors affect the dynamics of the conduct, change and transformation of each of these processes, both individually and jointly [4, 5].
Experience has shown that such an approach does not always allow an adequate assessment of the factors under study.
Thus, the issue of studying the dynamics, physical, mechanical and chemical properties of the process of strength gain of an artificial stone based on a cement binder is still a topical issue, despite the large number of works and studies of domestic and foreign scientists.
Yerofeyev, Regression dependency of basic properties of cementstone with change of its structure and age.
Lukina, The possibility of affecting the activity of the surface of cement minerals, Cement. 6 (1992) 75-78

The biopolymer compatibility with the urea phase is an important factor in the coating process since the adhesion properties at the interface will determine the final mechanical properties of the controlled release fertiliser.
Good mechanical properties such as modulus and impact strength are required to minimise attrition during the coating process and the final product must remain intact during storage and transportation.
One of the factors that affect the coating uniformity is the temperature inside the bed.
Therefore, an optimum temperature is very crucial because it will affect the wettabilty properties between the coating material and urea particle.
“Starch-isocyanate properties,” BioResources 6(1), 81-102

It has been found that the surface roughness obtained by cutting material with high mechanical properties is better than that of obtained by cutting material with inferior mechanical properties.
There are some internal and external factors that affect cutting quality.
In addition, the effect of mechanical properties of the material on surface roughness will be investigated.
The mechanical properties 6061 and 7075 aluminum alloys are presented in Table 1.
This means that AA7075-T6 material has higher mechanical properties compared to AA6061-T6.