Advanced Materials Research Vol. 893

Abstract: Thermolithography uses heat as the exposure source which has the possibility to generate patterns with minimum feature size exceeding the diffraction limit in photolithography. In addition, heat transport is much slower than light which allows us to control the transport distance. In this manuscript, we use transient heating to generate micro patterns of polymer resist with different thickness. The experiments use thin film micro-heaters with pulsed heating. Different pulse widths and periods are used to control the temperature rises and accumulated heating durations. The trend of the resulting resist thicknesses reveals the important role of the relaxation time in the crosslinking reaction.

Abstract: Adhesively bonding is becoming a widespread candidate technique for joining light-weight structural components. This paper investigates normal stress distribution in a single-lap adhesive joint using finite element method. Five layers of solid elements were used across the adhesive for obtaining an accurate indication of the variation of normal stress. All the numerical results obtained from the finite element analysis show that the spatial distribution of normal stress are similar for different interfaces. It can also be seen from the results that the left hand region is subjected to very high stress.

Abstract: The aim of this work is to investigate the shear stress distributions across the adhesive layer thickness in single-lap adhesively bonded joint. The shear stress distributions of a single-lap adhesively bonded joint have been investigated using the three-dimensional linear static and non-linear quasi-static finite element method. The analysis results indicate that there are significant differences between the linear static and non-linear quasi-static analyses. The results also show that the maximum value of the shear stress component S₁₃ occurs at the centre line while the maximum of the shear stress components S₁₂ and S₂₃ occur near or at the left-rear corner of the adhesive layer.

Abstract: Vernacular architecture is a term used to categorize methods of construction which use locally available resources and traditions to address local needs. This paper addresses the relation between Chinese vernacular architecture and locally sourced materials, which shows that the application of the vernacular materials is the primary component of the sustainable value of vernacular architecture. To assess the contribution of these materials for sustainability, a comparison with industrial materials at level of environmental indicators was established. This paper highlights the advantages of using local materials and techniques as a factor of local socio-economic development.

Abstract: The vibration differential equation of pipes conveying fluid with distributed follower force on two-parameter foundation is derived, the mode and nature frequency of clamped-clamped pipes with distributed follower force are calculated by complex modal. The relations between the nature frequency and the velocity of foundation liner stiffness and shear stiffness and mass ratio are studied. The numerical calculation shows that these parameters have a great influence to the nature frequency of the system and have certain effects to the characters vibrations of pipes.

Abstract: Aim of this article is in presentation of results of static and cyclic tests of round timber bolted joints with inserted steel plates. At first, timber specimens were tested without reinforcement. Based on static tests results, mechanical reinforcement methods were proposed and tested: using modified washers and boost with screws. Rate of improvement in tensile strength was established for used reinforcement method. Static tests in tension were carried out on pressure machine EU 100 in laboratory of the Faculty of Civil Engineering VŠB-TU Ostrava. Round timber joints multi cyclical dynamic (fatigue) tests in tension were made in laboratory of ITAM AS CR Prague and in TRI Žilina.

Abstract: In this article, a kind of structural displacement controlled reliability method was presented. The interval extension of multi-objective control algorithm was applied to control the structural displacement reliability. The method has realized the goal of controlling the multiple static interval reliability indexes by the control of the structural interval parameters. In order to accelerate the speed of the structural reanalysis, the Epsilon algorithm was used in the process of the structural reanalysis when a wide range of modification happened in the interval parameters. This method can both get a satisfactory accuracy, and improve the speed of the reanalysis. Numerical examples show that the method is effective and feasible.

Abstract: Hydraulic fracturing is an effective technique for increasing the productivity of wells producing from low permeability and tight oil formations (Reservoir permeability is less than 0.1mD). By establishing the seepage model of vertically fractured well, concerned on the threshold pressure gradient and stress sensitivity of the reservoir, the mathematical model has been solved and the productivity equation of vertically fractured well has been obtained in the paper. The productivity analysis shows that the bigger the threshold pressure gradient, the lower the productivity of oil well; the stronger the stress sensitivity, the lower the productivity, besides, the initial productivity of oil well increases with the increasing length of the fracture, but the increase rate tends small.

Abstract: Steel structure system is the combination of specific fitting composites which are bamboo veneer and cold bending thin-wall steel, it is a high efficiency and energy-saving building structure system. It contains the advantages of both steel and bamboo, giving full play to the advantages of light weight, high strength, seismic.

Abstract: Based on the comprehensive utilization of core, thin section identification, scanning electron microscopy and other technical means, through the YS2, 3 well fields of volcanic rock lithology and lithofacies analysis; understand that the formation and evolution of volcanic reservoirs play a constructive role and destructive effect ，which has important guiding significance[1,2].