Search results

The geometry and component properties significantly affected the failure modes of sandwich beams.
Mechanical, impact and thermal properties of polymers can be significantly enhanced by the incorporation of nanoclay particles in polymer matrix.
The mechanical properties of the foam materials depend on several factors, such as foam density, method of manufacture, cell structure and temperature.
Tensile, compression and three/four point bending tests have been conducted to obtain the mechanical properties such as strength, modulus of elasticity and hardness.
In recent years, the finite element analysis micro-mechanical models were used in order to study the effect of damage of cellular structure on the compression properties.

Numerical Simulation Research of Precision Injection Molding Control Method Based on P-V-T Properties of Polymers XIE Peng Cheng1,a, GUO Xiao Long1,b, GOU Gang1,c, DING Yu Mei1,d, ZHANG You Chen1,e, YANG Wei Min1,2,f 1College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China 2State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China axiepengcheng@gmail.com, bxiaolonggd@gmail.com,cgougang1986@gmail.com, ddingym268@gmail.com, ezhangyc@mail.buct.edu.cn, fyangwm@mail.buct.edu.cn Keyword: Precision injection molding; P-V-T; P-T control method.
P-V-T (Pressure-Specific-volume-Temperature) properties are inherent characteristics of polymers.
Introduction Injection molding as a complex forming process, a variety of factors affect the quality of the molded parts, such as weight, orientation and shrinkage.
The constant specific-volume control was regarded as an ideal packing control based on P-V-T properties of polymers before the gate frozen up and then drops to atmosphere.
References [1] Jian Wang, Pengcheng Xie, Yumei Ding, Weimin Yang, On-line testing equipment of P-V-T properties of polymers based on an injection molding machine.

The photoluminescence properties show a strong green emission at 520.89 nm due to S vacancy.
Although the structure and most properties of ZnS are comparable to more popular and widely known ZnO, certain properties pertaining to ZnS are unique and advantageous.
With respect to field emission applications, it is also well known that the needle-shaped tips can significantly enhance the material field emission properties.
But few studies on the field emission properties of ZnS nanostructures has been reported [20,21], and it is still a question whether it is possible to make excellent field emitters out of various ZnS nanostructures by some facile routes.
The factor β is strongly affected by the nanostructure density, the emitter geometry (such as aspect ratios), its crystal structure, and vacuum gaps.

The stress and deformation of designed model with material properties were analyzed by Solidwork COSMOS module.
The analysis models and materials properties are shown in Table 2.
Material Properties DESIGNATION PROPERTIES GRADE Young Modulus (GPa) Yield Stress (MPa) Tensile Strength (MPa) Poisson Ratio AISI 1035 205 283 585 0.29 Brass 110 276 552 0.33 Boundary conditions.
It would be affected by the supporter block at clip end, and the deformation was constrained in clip tip.
Excluding the effect of stress concentration, the overall safety factor is of about at least two times.

Poly(L-lactic acid) (PLLA) stands out for its excellent biocompatibility and good mechanical properties; however, the long period required for its total degradation, associated to the high crystallinity of its fragments may cause inflammatory reactions in the body, which restricts its use in some clinical applications.
Porosity and roughness are important factors for cellular growth in the whole membrane structure.
Luciano et al (1997) [11] showed that addition of plasticizers to a poly(lactic acid) matrix produced porous membranes with interconnected pores with good mechanical properties for their use as cellular culture support.
In the bone matrix, however, the osteoblast secretes factors that make the deposition of large amounts of minerals (phosphate ions and calcium) easy.
Conclusions Based on the results presented were found to influence the PCL-T in matrix PLDLA, which changed its morphology, physicochemical and biological thermal properties. 

Introduction Heat stress may negatively impact people, affecting their productivity, health and well-being, and overall economic activity [1].
The most common interlayer for laminated glass is polyvinyl butyral (PVB) due to its excellent mechanical properties.
The thermal insulation properties were evaluated using a handheld industrial thermal imaging camera (Hti HT-18).
Conductivity and thermal insulation properties.
Rethwisch, Optical Properties, in: Materials Science and Engineering An Introduction, ninth ed., NJ, 2014, 843-844

The obtained hemicelluloses were characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC), and comprehensive thermal analysis (TGA), which showed that potassium hydroxide significantly affected the yield of relatively pure hemicellulose.
These basic properties are very important for the suitable and reasonable studies of CS biomass.
The factors affecting hemicellulose extraction, such as hydrogen peroxide concentration, magnesium sulfate, pH value, and reaction temperature and time were analyzed by an orthogonal experimental design (Table 1) with optimization by single-factor experiments.
The L16(4-5) Orthogonal Test Table Factor A H2O2 (%, w/v) B MgSO4 (%, w/v) C pH value D Temperature (°C) E Time (h) Level 1 4 0.1 10 50 2 Level 2 6 0.2 11 60 4 Level 3 8 0.3 12 70 6 Level 4 10 0.4 13 80 8 Chemical Analysis.
Thus, hemicellulose-lignin linkages can be adequately exposed to the reacting solution, which positively affects extraction yield.

The polycondensation experiments were conducted in a 1-liter stainless autoclave fitted with a mechanical stirrer, thermocouple, gas inlet and outlet valves, pressure gauge and cooling coil.
Kinetics of polymerization reaction can be achieved by both indirect methods [8-11] in which a physical property relevant to the extent of reaction is detected and direct methods [12-16] in which the concentration of reactant or product is determined.
Similarly, the exponential factors (a and b) represent the order of reaction with respect to DHPS and DCPS, respectively. k is the rate constant and can be described by (3) Where, A is pre-exponential factor, Ea is activation energy, R is the universal gas constant, and T is the temperature in Kelvin.
Thus solubility of DHPS salt in NMP is one of the key factors affecting reaction rate even the final polymerization degree.
In PPSE preparation, it was found that concentration of catalyst 2A (defined as Catalyst2A/DHPS molar ratio, nc2A/nDHPS) could be another factor affecting polymerization.

Contrarily, the chip thickness is decreased to meet the requirements of IC package and improve the heat radiation properties of the chip.
But, the Eq.(2) is only a theoretical calculating formula of the MRR in the wafer rotation grinding, some factors affecting MRR, such as the grit size and the rotational speed of the cup grinding wheel, etc., are not expressed in Eq.(2).
This paper will study the influence of main factors on the MRR in the experiment in the following sections.
Other Factors.
(4) Abrasive size is one of the most important factors of the MRR of rotation grinding for large-scale wafer.

Experimental results showed that: 1.organic/inorganic hybrid nano-TiO2/PSt and nano-SiO2/PSt significantly affect the adhesion force of sizing agents and fibers.
Besides sizes constitute, the key factors which affect adhesion force between sizes and fibers also include the molecular structure of sizes, binding strength between macromolecules of sizes, sizes fluidity and so on.[3].
Because nano-particles have the characters of small size effect and big specific surface area[1,4], after full mixed with sizes matrix, it can play a role as cross-linking agent to form a combination with sizing agents, making macromolecules of sizing agents more closely, and enhancing the mechanical properties of sizes.
In the first place, since nanoparticles have the characters of small size effect and big specific surface area[1,4] , it can be easily added into inter- moleculars of polyacrylic acid size and play a role as cross-linking agent to form a combination with sizing agents, making sizing agents macromolecules more closely, strengthening the binding force among emulsion particles,sizing agents and fibers, and thus improving adhesion force of sizing agents and enhancing its mechanical properties.
Conclusions (1) Organic/inorganic hybrid nano-TiO2/PSt and nano-SiO2/PSt affect significantly on adhesion of sizing agents and fibers.