Advanced Materials Research Vols. 311-313

Abstract: This paper has studied heat sealable properties of biaxially oriented polyester film modified by isophthalic acid(IPA) and neopentyl glycol (NPG). The seal force of heat sealable film under different seal conditions and thermal properties under different IPA proportions were studied by use of electron stretcher, SEM, DSC and so on. The results indicated that when seal temperature was 110°C, seal time was 2.5 s, seal pressure was 400N, the higher seal force was achieved, in which seal layer didn’t contain SiO2. At the same time, seal force increased with the decrease of SiO2 size from 2.5-3.5um to 0.01-0.03um and increased with the IPA proportion from 14% to 18%.

Abstract: As a simple and useful approach, vapor-phase photografting acrylic acid was used to modify the surface of PET films. Catalyst of silver nanoparticles was distributed on the photografting PET films equably after reducing by ascorbic acid. Topography of the pristine, grafting and metallized PET films was characterized by scanning electron microscope (SEM). XRD and FTIR-ATR were also used to analyze the electroless plating copper layer and the grafting PET film respectively.

Abstract: For three-dimensional mechanical design and reverse engineering in manufacturing, point clouds are obtained from some scanners before they are used to generate geometrical shapes in a design. However, original point clouds are poor in quality because of noise, incomplete, and non-uniform data samples. Simplification is an important step to generate a good result prior to polygonal meshes. Usually we cannot obtain uniform points using traditional cloud simplification methods. This paper proposes a new method for non-uniform points cloud simplification (NUPCS), which is based on affinity propagation clustering. Experiments are carried out for some data sets and results show that our proposed method can deliver good simplification performances.

Abstract: Tantalum (Ta) thin film was deposited onto Si (100) substrates using direct-current magnetron sputtering. The structure and mechanical properties of Ta films were investigated by X-ray diffraction, Field emission scanning electron microscope, and nanoindenter. The results indicated a transition from regular to irregular Hall-Petch relationship with decreasing grain size. Besides, a peak indentation hardness value of 12.8 GPa, much higher than that of bulk coarse-grained Ta, was obtained at the grain size of 36.3 nm.

Abstract: Polyester textiles usually have excellent mechanical properties. However, their mechanical behaviors under extreme conditions such as in the environment with high ozone concentration usually decay after a certain time period. Aiming at increasing the mechanical behavior of commercial polyester textiles under extreme conditions, a PET thin film coated with pure aluminum (Al) on its surface has been introduced as the top layer of the fabricated material with polyester textile as the middle layer. Main purpose of the study is to evaluate the role of aluminum thin film on the surface in improving the mechanical behavior of the polyester textiles after they have been exposed in the environment with extremely high concentration of ozone gas.

Abstract: In this study, a polyvinylidene fluoride (PVDF) ultrafiltration (UF) membrane was modified by dispersing nano-sized ZnO particles in a PVDF solution. PVDF membranes were fabricated by a phase inversion method. The permeation flux, mechanical properties, rejection of BSA aqueous solution and reclaimed water treatment were examined. The results indicate that the permeation flux of the modified membrane was lower than the neat PVDF membrane. The maximum tension force and tensile elongation length were improved initially for the modified membrane. The rejection of BSA aqueous solution was improved to 98.4%, while the neat PVDF membrane was 87.26%, and the relative water flux reduction was lower than the neat PVDF membrane. The chemical oxygen demand (COD) removal of the reclaimed water treated by the modified membrane was 46.36%, while the neat PVDF membrane was 14.09%.

Abstract: Improving working performance of cone crusher contributes to developing cone crusher of new style, high efficiency, energy saving and environment protection. In the past few decades, a large number of research results were obtained in the performance optimization of cone crushers. By collection, classification and study of the achievements on relevant literatures, patents and research results link to cone crusher, the research of modeling of working performance, crushing chamber optimization, real time optimization of cone crusher and application of discrete element method for optimization of cone crusher are presented. Several problems on crushing theory, optimization method and objective function that need be further studied and developed are also discussed.

Abstract: Stress migration behaviors in Tungsten (W) films were investigated according to morphological characteristics and residual stress analysis. Results show that stress relaxtion induced formation of voids and hillocks strips, which resembles the void / hillock pair observed in Cu film electromigration experiments. Analysis indicate that the formation of chocolate sphere shaped W hillocks is intimately related to the atoms diffusivity.

Abstract: The purpose of this study is to examine the role of airflow on fiber’s strength under different inlet pressure. A two-parameter numerical mathematic model is developed to describe the airflow in splicing chamber. The simulations are validated against the experimental results regarding fiber’s strength. The flow field survey show that the swirling flow in chamber play a significant role in fiber’s splicing. The strength of splicing fiber is determined by two characteristics of flow, namely, vortices and pressure gradients which both were affected by inlet pressure. When the inlet pressure keep low, the strength of fiber is dominated by vortices of flow, otherwise, pressure gradients push fibers to wall quickly so fibers can not intermingle with each other completely.

Abstract: This research effort aims to evaluate the mechanical properties of concrete with two aggregate type, light weight and normal weight at elevated temperatures. To understand the mechanical properties at elevated temperature, normal and light weight concrete of 60 MPa grade was exposed to temperature range 20 to 700°C under 0%, 20%, 40% load conditions and compressive strength, elastic modulus, thermal strain and transient creep at target temperature were inspected. Experimental results show that light weight concrete has higher compressive strength, although the strength of normal weight concrete degenerated more sharply than the light weight concrete at elevated temperature. Moreover, the thermal strain (0% unstressed) and total strain (20%, 40% stressed) of normal weight concrete was higher than that of light weight concrete. Loading conditions significantly influenced the mechanical properties of normal weight concrete compared to that of light weight concrete at high temperature.