Applied Mechanics and Materials Vol. 389

Abstract: The deep narrow groove of the coupling plate and side with WC-CO coating was grinded by diamond wheel with metal bond and vitrified bond. The side of the deep trench flatness error was less than 0.02 mm, the bottom of the tank around the corner radius was less than 0.3mm. The type of porosity, particle sizes, surface roughness were measured by experiments, the data for the selection of the grinding wheel bond varieties. The experimental results show that grinding wheel with vitrified bond was suitable for parts of small coating porosity, fine particle size, surface roughness, and others were suitable for the grinding wheel with metal binder.

Abstract: Although ultra-high strength steel (UHSS) sheets with tensile stress above 1.0 GPa have a great attention in the automotive industries for reducing the weight and improving fuel efficiency of auto-body, the poor formability of UHSS sheets is one of the main factors hindering their industrial application. Enhancing the formability is a very important and challenging problem to both automotive and manufacturing engineers. In this study, the electro-plastic effect, which is first discovered in 1960s, of ultra-high strength steel sheets is investigated to improve the formability. To begin with, a test system is built up to carry out the tensile test with heavy electric current flowing through the specimen. The evolutions of the flow stress and the electric resistivity are obtained using this test system. The significant decrease in the flow stress caused by the heavy flowing through current is observed.

Abstract: For design to be more safe, dynamic fracture toughness (DFT) of material needs to be determined. Compared to static loading, dynamic loading procedures are not well established. Calculation of DFT is complicated and costly. Failure process of structures is greatly influenced by dynamic loading. In the past only steel and cast iron were employed for structure design purposes but now many new materials such as (a) composite, (b) alloys (titanium, magnesium), (c) ceramic, (d) concrete, and (e) brittle materials are being used. DFT calculations of materials under dynamic loading have resulted in new theories and experimental techniques. In this paper a critical review of the developments for the calculation of DFT for the materials is presented.

Abstract: This paper presents an overview of ionic polymer metal composites (IPMC), various properties improving techniques employed in the last decade and its potential applications. IPMC consists of a polymer membrane sandwiched by metal electrodes. On application of a small voltage, it bends towards anode. Due to its low activation voltage requirement (1-3V), low weight, high flexibility and ability to take any shape, IPMC has attracted the attention of researchers whose current aim include enhancing the force output to make them applicable for use in industrial, underwater SONARS, energy harvesting and biomedical fields. This paper provides an overview of the efforts made by the research community over the last decade, the identified applications with the references for elaborated study.

Abstract: The submitted paper deals with analyses of impact of water jet technology head vibrations due to variations of kinds and granularity of abrasive during steel cutting manufacturing process using AWJ technology. The paper points at necessity to diagnose and subsequently eliminate possible sources of adversed vibrations. They can influence lifetime and wear of water jet technology head, they can lower reliability as well as cutting edge quality.

Abstract: This article conducts research on the structure of board and the complete set of equipment development technology. It designs and develops new composite structural design solution and process route. In turn, it develops automatic and smart complete set of equipment, which can produce new high strength composite board. The board combines the advantages of corrugated fiberboard and honeycomb cardboard, so it has broad application prospects and a huge market potential.

Abstract: This paper mainly introduces the performance characteristics of the composite materials and describes their application in children's outdoor playground, focusing on the potential applications of composite materials in the pillars, platforms, seats, carpets, safety net and other aspects of playground and looking forward to their development prospect in this field.

Abstract: The high efficiency deep grinding is widely used in manufacturing. The experiments were carried out to study on the high speed deep grinding force and grinding burn and cracks in grinding 40Cr steel specimen with Al₂O₃ wheel. The experimental studies demonstrate that the grinding force increases with the grinding layer depth. The trail of grinding on space surface is blurred progressively, the surface topography deteriorates gradually. When the depth of grinding increases to the certain value, grinding burn appears, and micro-cracks emerge. Selecting the optimization parameter in high speed deep grinding can avoid the grinding burn and grinding cracks.

Abstract: In this paper, we fabricated and evaluated the piezoresistive type flowmeter with focused-ion-beam (FIB) system. The flowmeter body is made up of the low stress silicon nitride, and the nanometer sized piezoresistive layer is deposited with FIB system for the smaller measuring area. The flowmeter is evaluated in the wind tunnel, and the 0~4m/s air flows are applied. Although the sensitivity, ΔR/R shows the negative behavior unlike the conventional piezoresistive layer due to the added materials during the FIB process, the measurement results show the ΔR/R has a suitable sensitivity (-1.04E-2/ms-1) and a rapid response time (0.8sec). Those results represent the fabricated piezoresistive type air flowmeter has the possibility for the small area detection.

Abstract: The roughness and stripe of the carbon fiber surface is increased, what is in favour of the combination of fiber and resin, and also increases the active ingredient of fiber surface, by using the low temperature plasma on carbon fiber surface treatment. In this paper, we research the influence of CF/PES-C material ILSS with low temperature plasma treatment. Experimental results show that the low temperature plasma treatment improves the interfacial adhesion performance of CF/PES-C composite material, so that it mends the interfacial property of the composites.