Advanced Materials Research Vols. 415-417

Abstract: The necessity of integrating users into innovation process is widely researched. However, there is little literature on risks of users’ integration. Thus, a risk management framework for users’ integration in product innovation process is established based on the characteristics of user’s collaborative work. Meanwhile, key techniques, methods and processes supporting this framework are also discussed. Meanwhile, a risk factors reference set for users’ integration in product innovation is proposed, which is rare in other product innovation risk researches. Besides, the author provides evaluation process to evaluate performance of the proposed risk management framework. Also, recommendations for future research have been suggested.

Abstract: Modified nanosilicas have been prepared by grafting an organosiliane precursor, 3-methacryloxypropyl trimethoxysilane (MPS), onto silica surface. The grafted silane content was determined by thermogravimetric analysis (TGA). Subsequently, the modified nanosilica was used to reinforce epoxidized natural rubber (ENR). The effects of surface modification and filler content on morphological and mechanical properties of ENR nanocomposites were investigated.

Abstract: In this paper, we propose iterative learning control (ILC) scheme for exoskeleton arm driven by pneumatic artificial muscles (PAM), with special and unknown parameters, performing repetitive tasks. This desired control input of ILC was estimated by radial basis function (RBF) neural network incorporated experience database. An ILC controller, which uses the position of the joint where an angular sensor is used as the input of the ILC controller, is developed and tested on exoskeleton arm under well controlled conditions. RBF neural network was proposed to obtain the initial value of ILC. The experiment result on the experimental platform show that the algorithm is successful also in the application of exoskeleton arm.

Abstract: In our study, a new kind of material for toluene adsorption was prepared by melt blending with EPDM as the matrix and waste dusty slag as the filler. By considering the influence of pH, temperature, stirring speed on adsorption capacity. The results showed that the environmental pH has little effect on the toluene absorbency of the composite; “Room temperature” is the optimum temperature; increased the stirring speed can reduce the adsorption time.

Abstract: A novel clay containing a heterogenized Ce(SO₄)₂ complex (Ce-bentonite) has been prepared via ion exchange of a Chinese Na⁺-bentonite with pillared layer clay complex. It was established that the active species [Ce(OH)₃]⁺ was situated on the external surface of the catalyst, which was found to be efficient in the liquid-phase esterification of acetic acid with 2-methoxyethanol.

Abstract: The invention of plastic film has brought not only convenience but also environmental pollution to people. To use natural vegetable fiber is the mainly approach to solve the problem. In this paper, the waste cotton fiber was used as raw material and the cotton nonwoven sample was made through wet laying process, after strengthened by chitosan, degradable film was prepared. The performances of the film were characterized and analyzed by testing the strength, air permeability, moisture permeability and other indexes. The results showed that chitosan can be used as strengthening agent, the performances of the film strengthened were improved, and it was degradable.

Abstract: β-Sialon bonded ZrO₂ composites were prepared by reaction sintering process using β-Sialon and CaO stabilized ZrO₂ powders as raw materials.The effect of β-Sialon powder additions on the properties of the composites was investigated. The results show that the samples with 10 wt% of β-Sialon addition had the lowest apparent porosity (29.80%) and the highest of flexural strength (68.70MPa). The thermal shock resistance in carbon addition of the composites could be improved by addtion of 5wt% β-Sialon. It may be relative with that the sample had the lowest thermal expansion coefficient in vacuum.

Abstract: The requirements of a major industry whose products are rail-beams to level the both sides of rail-beams were analyzed. Some of basic parameters have been computed by the analytical method. The process of roller’s leveling was simulated with explicit nonlinear finite element method, and the results were proved close to those from analytical method. The simulation was applied to an approach to the most suitable rolling reduction. The final conclusion shows that simulation is a powerful way to improve design’s qualities.

Abstract: In order to increase the modifying effect, the Fe-V-Nb alloy was rapidly solidified with melt-spin method, and the nano-sized ribbon was gained at 40-45 rad/s. Subsequently, Fe-Si-Mn spring steels was modified by amorphous and nanocrystalline. The results show that the microscopic structure of Fe-Si-Mn spring steels modified by amorphous and nanocrystalline is better than micro-alloyed with the same amount of niobium and vanadium, the mechanical properties of Fe-Si-Mn spring steels modified by Fe-V-Nb intermediate alloy are improved evidently: the yield-strength is reached to 1484 Mpa, the yield ratio is reached to 0.94 and the hardness is reached to 64HRC when specimens quenched.

Abstract: Dual-phase steel is a type of sheet material newly developed to adapt to the lightweight and safety needs of vehicle. In this paper, 1.7 mm thick dual-phase steel DP600 was taken as the object of study, its resistance spot welding performance characteristics and welding mechanism was studied in detail. The thermoelectricity transient process of welding was simulated with the finite element software and the experiment under corresponding welding parameters. It’s found that, under proper current circumstances, the simulated nugget size and the experimental result is in good agreement except the large current, the simulated deformation morphology and experimental result can be consistent, which indicates the good accuracy of analysis on resistance spot welding mechanism of dual-phase steel DP600. According to the results, the specific method and theoretical basis about nugget size and welding deformation predictive control was discussed, created the mutual relations between the resistance spot welding performance characteristics and welding mechanism of dual-phase steel DP600. The study effort has practical significance in comprehensively understanding the resistances spot welding mechanism of dual-phase steel, as well as in application and quality control of duplex steel in automotive body welding.