Applied Mechanics and Materials Vols. 148-149

Abstract: The search for techniques and materials able to improve structure quality and durability has lead to research some methods that are able to measure the transfer properties of composites. Cement type has an important influence on mortar performance, and chemical and physical deteriorations modify microstructure, and thereby transfer properties. The aim of this work is to evaluate two methods which can measure the transfer properties of cement based materials: capillary absorption and air permeability tests in mortars produced with blastfurnace slag Portland cement. The relationship between these two methods was investigated. The mortars were submitted to steam curing (60 °C) and standard curing. Results show that steam curing improved initial compressive strength. At 28 days all mortars had the same performance. Water absorption coefficient and air permeability was higher for steam cured mortars. There was a significant correlation between both tests results.

Abstract: With lots of maintenance equipments needed and high energy consumption, the traditional cold pressing process for cement-bonded particleboard has long production cycle. For the recent years, Scholars at home and abroad have made great progress in the research on fast curing process for cement-bonded particleboard, this paper summarizes the process and research status of fast curing technology for cement-bonded particleboard and propose research direction in order to provide reference for fast curing process of cement-bonded particleboard.

Abstract: Advanced development of an Inertial Navigation System (INS) using rotating modulated technique based on Micro-Electro-Mechanical Systems (MEMS) sensors is described. The system architecture and the mechanical structure are detailed. Alignment and navigation algorithms apposite to the RMSINS system are derived. Preliminary system static navigation experiment results are presented. Performance results show that rotating modulated technology, with appropriate navigation algorithm, makes it possible to use the MEMS sensors in SINS system, with the benefit of reducing system costs as well as improving accuracy.

Abstract: For design of truck cabin, the survival space must be guaranteed for the safety for driver and front seat passenger in event of crash, which is the legal requirement described in ECE-R29 regulation. In this paper, a finite element model of a high-top cabin for heavy truck was built with commercial code Hypermesh, and a manikin according to ECE-R29 was added to the driver seat. The explicit finite element program Ls-Dyna was used to verify the roof strength and rear wall strength. Analysis and discussion on the deformation of the truck cabin and the survival space of the dummy were presented. The survival space of the cab was proved to be sufficient for the safety of the driver.

Abstract: Nine novel crosslinking phenol-amine resin block polyether (PARPE_mn) as demulsifier were synthesized for Shengli Oil Field. And the dilational rheological properties of absorbed film of nine different structural demulsifiers were investigated by longitudinal wavesmethod (the Langmuir trough-Wilhelmy plate technique) at the decane-water interfaces. The results show that demulsifier concentration is an important factor in controlling the dilational properties of adsorption layer. The dilational elasticity for all demulsifiers appeared a maximum value with the increasing concentration. Most important of all, the relations between interface dilational properties and demulsifier structures have been studied. It demonstrates that the interfacial dilational modulus increase with the increase the HLB value of demulsifiers.

Abstract: In processing of laser cutting metal sheet, there is the complex correspondence between crafts parameter and surface quality. This paper proposed a control model of laser cutting quality based on Back-Propagetion(BP) neural networks, which indicated the relationship between craft parameters and surface roughness of laser cutting. By the use of the simulated annealing, the fitting accuracy and convergence of the network would been improved. Experimental design with the Central Composite Design could increase the amount of information and reliability of network trainning samples. After the concrete manufacturing of stainless steel sheet, it was seen from the results the developed method gained better reliability and significance of application.

Abstract: In order to investigate the multipoint ignition process and the combustion stability controlling mechanism of the bulk-loaded liquid propellant gun, the cylindrical stepped-wall observation chambers and cylindrical observation chambers are designed. The expansion process and interaction of high-speed twin combustion-gas jets in liquid are studied by high speed photographic system. The influence of chamber structure, nozzle diameter, dual-orifice interval, jet pressure on twin gas jets expansion process has been discussed.

Abstract: Polymer-modified cement compounds for waterproofing membrane is widely used in tunnel, reservoir, rooftop, bathroom, cellar and other construction work for the better mechanic properties and waterproof effect. And all these properties are decided by the interaction between the compositions and the final microstructure they formed. However, different polymer cement ratio lead to excellent different properties, people have done a lot of research on polymer-modified cement compounds for water-proofing membrane, but the micro explain has been researched rarely. In this paper, scanning electron microscope was used to observe the microstructure between different waterproofing membranes, the properties of tensile strength, braking elongation and water absorption rate were tested, and the relationship between them were also researched.

Abstract: According to the principle of time domain induced polarization, the transmitter controller is designed with Micro Control Unit, the design of hardware and software is described in detail. Time synchronization is realized by GPS, so the accuracy of the system is improved. Simulation and actual test show that the system has characteristics of safety and high stability, it has good prospects.

Abstract: The quantity and quality of heat transfer to food are important factors in cookware. They depend on temperature degree and Temperature Distribution (TD) on top surface of pan that is exposed to food. The heat is not uniformly spread over the pan so is appeared hot spots on the cooking surface. Using Multi-Layer Plate (MLP) causes regular TD on the top while bottom heated irregularly. Another significant properties in cookware is that how long it can stores heat and using non-reactive materials is another essentially consideration. In this study the main objective is to find the best structure (single or multi-layer) and the best metals to provide maximum temperature and uniform TD upside surface of pan and also analyzing transient behavior of used materials with goal of improving the thermal quality of pan to economize the energy. To achieve this aim were employed Finite Element Method (FEM). The analysis has been extended for Copper, Aluminum, Titanium, Stainless Steel in composite form and Grey cast iron, Iron, Carbon steel as single layer, we achieved the best TD on Cu/Ti MLP.