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Rubber sealing ring is one of the common seal components of military products, and its performance will directly affects the storage life of ammunition.
There are many factors influencing the sealing ring storage life, so it is not easy to give the exactly life for one specific model of sealing ring.
Introduction Rubber sealing ring is one of the common seal components of military products, and its performance will directly affect the storage life of ammunition.
During natural storage process, main factors which impact the performance is heat, oxygen, mechanical stress and oil medium, therefore, in a certain temperature range, aging test in oven is same with natural aging under warehouse storage condition in mechanism.
Combined with the storage conditions and methods for material evaluation, we get the dynamical equation between O-ring permanent deformation rate and ageing time by using the relationship between the material properties’ variation and ageing time as well as Arrhenius equation.

Adhesion property between SU-8 layer and substrate is subject to many factors such as substrate material, refractive index of substrate, impurity and the incoming innerstress because of different thermal expansion and so on.
Bubbles can induce the non-uniform of SU-8 photoresist, and affect the pattern size.
In the Micro electroform technics, electroform uniformity acts as an important factor in quality domination.
Chinese Journal of Mechanical Engineering, Vol.24(2011) No.5, p.837-838
Chinese Mechanical Engineering, Vol.16 (2005), No.4, p.448.

Effects of UV irradiation on the molecular structure and tensile properties of pure PP, α-PP and β-PP were investigated.
Therefore, preparation and properties study of β-PP have attracted active research interest in the last decades.
Degradation of polymeric materials is a common phenomenon which leads to changes in chemical, physical, and mechanical properties.
There are many factors causing polymer degradation, such as solar irradiation, heating, water, mechanical loading, chemical attack and so on.
Among these factors, solar irradiation, especial ultraviolet (UV) irradiation is a key factor which can cause photodegradation of polymer under outdoor service environment.

Manufacturing Techniques and Mechanical Properties of Recycle High-Strength PET Compound Nonwoven Ching-Wen Lou1, b, An-Pang Chen2, Jan-Yi Lin2, Mei-Chen Lin2, Jin-Mao Chen2,c and Jia-Horng Lin2,3,a 1Institute of Biomedical Engineering and Material Science, Central Taiwan University of Science and Technology, Taichung 406, Taiwan, R.O.C. 2Laboratory of Fiber Application and Manufacturing, Department of Fiber and Composite Materials, Feng Chia University, Taichung City 407, Taiwan, R.O.C. 3School of Chinese Medicine, China Medical University, Taichung 40402, Taiwan, R.O.C.
Afterwards, the mechanical properties of the PET compound nonwoven was measured both at cross direction and machine direction.
Its strength is affected by three influencing factors including the reactive temperature, retention period, nitrogen purity at solid phase polymerization[1-2].
In the experiment, the ratio of high-strength polyester fiber was changed to evaluate the mechanical properties of high-strength PET compound nonwoven fabrics at cross direction (CD) and machine direction (MD).
And recycle high-strength polyester fiber has the benzene molecular chain, high crystallize and high orientation, which is responsible to its high mechanical property.

(1) This chemical interaction unfortunately would affect the phase purity and the microstructure of the hydroxyapatite-zirconia composites, leading to undesirable mechanical and biological properties.
Mechanical properties of the sintered composites affected by porosity.
It can be seen that the three mechanical properties of the HA06F-YTZP composites increased with the YTZP content up to 20wt%.
Koishi: Microstructure and Mechanical Properties of Sintered Body of Zirconia Coated Hydroxyapatite Particles, J.
Kim: Reaction Sintering and Mechanical Properties of Hydroxyapatite-Zirconia Composites with Calcium Fluoride Additions, J.

The incorporation of these reinforcements improves the mechanical and tribological properties of the alloy by refining the microstructure and promoting uniform dispersion of hard ceramic particles.
Alloys have been used in a variety of ways, as MMCs they are well investigated for their potential to improve mechanical properties e.g., tensile strength, wear resistance as well as physical properties e.g., density, thermal expansion.[8] Heat treatment is essential to current technology because it improves the mechanical properties of Aluminium alloys, particularly through precipitation hardening.
A sharp increase in wear loss is evident with increasing load and moderate variation with speed, suggesting that ZrO₂ content is the dominant factor affecting wear resistance.
"Microstructural properties of wear-resistant alloys."
"The mechanical properties of wear-resistant coatings: I: Modelling of hardness behaviour."

Studies of the mechanical and operational properties of the obtained composites have confirmed the possibility of using techno-genic raw materials as functional fillers that affect the mechanics, durability, and also significantly reduce the cost of finished products.
The aim of the work is to analyze the feasibility and effectiveness of the use of waste from the metallurgical production of silicon as a filler of polymer compositions for the production of building materials based on the study of the characteristics of the filler, affecting the physicomechanical properties of the composite and the process of its preparation.
Studying the shape of particles is important because this indicator affects the structure, properties and technological parameters of the preparation of polymer composites [14, 15].
New compositions of materials were developed, technological parameters for the extrusion production of polymer composites with high performance and mechanical properties were established.
Mechanical properties of filled polyvinyl chloride compositions / I.

The polymer matrix composites (PMCs) are increasingly being used in structural applications owing to their superior mechanical properties.
It has been found that the drilling parameters significantly affect the compressive behaviour of laminates with drilled holes.
Drilling induced damage drastically affects the residual tensile strength of the drilled composite laminates.
There are reported studies focussing on the effect of notches and holes on different mechanical properties of composite structures with holes, but there are no clarifications for hole making technique [7-9].
The results are important for designers of composite structures as structural designers should take into consideration the drilling induced damage in laminates with hole and suggest appropriate factor of safety to account for the reduction in mechanical properties after the drilling process.

The results show that there is considerable difference in the properties obtained and are interpreted and discussed in detail in the paper. 1.
Introduction The ability to recover large strains coupled with excellent functional and mechanical properties of the SMA materials make them the most interesting and technologically important class of smart materials for various applications, such as hydraulic couplings, civil structures, actuators, MEMS, endovascular stents, etc. [1–3].
NiTi-, Cu- and Fe-based alloys are quite popular among SMAs and, among these SMAs, NiTi-based SMAs have captured a niche market for them owing to their attractive mechanical and functional properties together with excellent biocompatibility [4].
This behaviour also depends on factors like alloy composition, thermomechanical treatments, etc.
This is attributed to two factors: 1. larger diameter of the wire sample; and 2. slow rate of heating and cooling of the sample.

Surface roughness has an impact on the mechanical properties such as, fatigue behavior, corrosion resistance, creep life, etc.
Surface roughness is affected by many factors such as; machining parameters, cutting tool properties, work piece properties and cutting phenomena [1].
Kim and Kang [10] investigated the machining of AA2024 alloy with polycrystalline diamond end mill using the criteria of surface roughness, as a result of the experiments conducted at different values of cutting speed, axial and radial depths of the cut, and feed per tooth parameters, it was found that, axial depth of cut is the most significant factor affecting surface roughness while radial depth of cut has a low effect.
Yang and Chen [11] studied the effects of depth of cut, spindle speed, feed rate and tool diameter factors on surface roughness in the milling of AA6061 via Taguchi method, the experiments based on L18 orthogonal array were evaluated with analysis of variance (ANOVA) and S/N ratio analysis and it was seen that all the factors except tool diameter were significant.
Tool flute number is selected as a new factor in this study to express its affect on surface roughness quality with other machining parameters which known as control factors.