Applied Mechanics and Materials Vols. 365-366

Abstract: Internal Defects are more likely to occur when 1Cr18Ni9Ti pipe joint are produced by traditional casting method or welding forming method, while the upsetting extrusion proposed in this essay can not only meet the part quality requirements, but also save material and shorten processing cycle. By numerical simulation analysis about part upsetting extrusion forming process with the finite element analysis method, we can obtain many index numerical values in part forming process, and therefore provide reliable quantitative basis for optimum design.

Abstract: In this study, it is focused to make a double side metal plate with internal structure. The stainless steel powder (17-4PH 15F) was used in PIM process. PE(HDPE and LDPE) and PP were used to make the sacrificed insert with honeycomb structure using plastic injection molding process. And then these sacrificed insert parts were inserted at metal injection mold and metal injection molding process was carried out to build green part with rectangular shape. Subsequently, de-binding and sintering process were adopted. The dimensional contraction was occurred about 15.5% in width direction and about 16.2% in thickness direction.

Abstract: With the rapid development of the technology of liquid crystal display, LCDs have become the main stream displays. However, if there are no appropriate ways to recycle the discarded LCDs, the environment will be polluted and the resources will be wasted. TFT-LCD panels mainly consist of the color filter (CF) substrate and the thin film transistor (TFT) substrate which both have a surface covered with indium-tin oxide (ITO). ITO layer contains the metal of indium which is rare, precious and of high value. In view of the difference of the structure and material of the CF substrate and TFT substrate, an efficient and green process has been presented for recycling the indium by means of theoretical analysis and experimental verification. Under heating condition, the sodium hydroxide solution is used to dissolve the color filter of the CF substrate and the ITO layer attached to the color filter can be eliminated quickly and the metal indium can be enriched by filtering solution. By grinding the ITO layer on the TFT substrate with the aid of water-proof sand paper and collecting ITO scraps, indium can also be enriched quickly. The experiments show that the indium content of the CF substrate and TFT substrate are both quite low. Enriching indium on the premise of not dissolving indium is beneficial to the concentrated recovery of indium and is helpful to raise the recycling efficiency and protect the environment.

Abstract: For solving the problem of the geometric simulation of 3D braided composites, taking four-step rectangular 3D braided fabrics as an example, and based on the analysis of yarn moving regulation, the mathematical models between the braiding technique parameters and the geometric structures is established. By taking UG as the 3D display platform and MATLAB as the control core, 3D geometric simulation of the pre-modeling entity is realized. Such a simulation enables the users to observe the braid spatial structure and braiding moving process intuitively and modify them dynamically on the Internet. With this method, the design quality and efficiency of products will be raised remarkably.

Abstract: This study produces the far-infrared emitting composites by using impact-resistant polypropylene, short glass fibers, and far-infrared masterbatches. The addition of short glass fiber and far-infrared masterbatches is then evaluated to determine their influence on the mechanical properties and far-infrared emissivity of the resulting composites. The experimental results show that with an increase in the content of short glass fibers, the tensile strength increases from 34 MPa to 56 MPa, the far-infrared emissivity increases from 0.85 to 0.93, but the impact strength decreases from 1037 J/m to 197 J/m, proving that the resulting composites have desired mechanical properties and far-infrared emission.

Abstract: This study creates the high resilience nonwoven fabrics by using modified polyester fiber. In order to have resilience, the nonwoven fabrics are thermally bonded with various temperatures and the air permeability and mechanical properties of the nonwoven fabrics are then evaluated. The optimum tensile strength of 481 N and resiliency of 26 cm occur when the nonwoven fabrics are thermally bonded at 180 °C, and the optimum tear strength of 276 N occurs when the nonwoven fabrics are thermally bonded at 160 °C.

Abstract: This study produces composite geotextile, and evaluates its effectiveness of being used for soil protection. Kevlar fibers, high strength polyethylene terephthalate (HPET) fibers, recycled polyethylene terephthalate (RPET) fibers, and nylon grids are made into Kevlar/PET/Nylon composite geotextiles, which are then tested for air permeability, and tensile, tearing, and bursting strength. The experimental results show that when the ratio of Kevlar fibers to HPET is 0/40, the resulting composite geotextile has the optimum mechanical properties, where the tensile strength is approximately 990 N, tearing strength is approximately 890 N, bursting strength is approximately 3700, and an air permeability is around 35 cm³/cm²/s.

Abstract: The successive civilengineering disasters in recent years make the use of geomaterial for disaster prevention popular. Geogrids, one type of geo-material, function as soil reinforcement. This study uses polypropylene (PP) fibers to wrap high strength polyester (HSPET) fibers, forming the PP/HSPET fasciated yarn. PP fibers are acid-resistant and alkali-resistant, and thus serve as the skin of the fasciated yarn. HSPET fibers, the core of the fasciated yarn, protect and prolong the service life of the resulting geo-material products. Finally, the influence of mechanical parameters on the appearance and strength of the fascinated yarn is explored.

Abstract: Heat energy plays a significant role in resources and industries, which makes the development of energy-saving and thermal retention materials important to environment protection. This study combines three-dimensional hollow Polyethylene Terephthalate (TPET) fibers, recycled far-infrared polyethylene terephthalate (RFPET) fibers, and low melting temperature polyethylene terephthalate (LPET) fibers at various ratios to make the RFPET/TPET hybrid nonwoven fabric. The tensile strength, tearing strength, air permeability, and far infrared emissivity of the fabrics are evaluated. With a blending ratio of 8:0:2, the hybrid nonwoven fabrics have the optimum tensile strength of 145 N, tear strength of 184 N, and air permeability of 205 cm³/cm²/s.

Abstract: Recently, the biomaterial is in rapid development stage, which could be widely applying in medical application, due to its biodegradability, nontoxic and biocompatibility. Chitosan is naturally abundant polymers have the biodegradability, nontoxic and biocompatibility. In this research, the chitosan and silver nitrate were used to develop the antibacterial agent via nanotechnique. In the reaction system, the reaction time and stirring speed were discussed, which will affect the surface plasmon resonance. The particle sizes were measured using transmission electron microscopy (TEM) and UV visible spectrophotometry. The silver nanoparticles size was below 100 nm via TEM. In addition, the results of antimicrobial activity indicated that the antibacterial agent has well antimicrobial activity on staphylococcus aureus. Due to the silver nanoparticle provides relatively higher surface area to contact with bacteria affect DNA molecules by losing their replication abilities.