文胸肩带的选择依据分析

针对内衣企业在文胸肩带配伍时缺乏有效的选择依据,没有形成规范的、切实可行的文胸肩带选取方法的问题,以文胸肩带舒适性理论研究为基础,提取了影响文胸压力舒适性的因素,并实施了文胸肩带拉伸强力实验,采用YG（B）026H型电子织物强力机测试了6款规格的18个肩带样本,并对实验数据进行了SPSS分析.研究表明,在相同开度的条件下,肩带模量和宽度的比值（M/W）、模量拉伸率曲线曲率是选用文胸肩带的重要指标,其中M/W的数值范围应在0.04~0.05较为合适.     

文胸肩带压强分布分析

为了找出肩带压强的分布规律,被测试者分别穿着4款文胸,做出直立、两臂上举、两臂前伸、端坐、放松坐和前倾90°的动作,采用AMI-3037-5S服装压力测量系统对肩带上6个主要测量点进行压强测量。结果表明：不同款式文胸在穿着时,肩带压强分布规律相同。在肩部的最高点处值最大,向前向后依次变小,但在肩带的最后端与文胸上比的交叉点处受到上比的作用,压强值会有所增加。人体做不同动作时,肩带上各点压强受到骨骼肌肉变化的影响也会产生不同的变化;与肩带交叉点处的骨骼凸起或肌肉紧张时,压强会增大。     

基于拉力带的系列新型SST-LEJ设计与分析

设计了一种基于大柔度的柔性铰链,命名为SS-LEJ,利用等效法推导了其弯曲等效刚度的理论计算公式,通过设计实例的理论计算和ABAQUS仿真分析,验证理论计算公式的正确性.为了有效提升SS-LEJ的抗拉压性能,设计了4种不同位置和形状的拉力带的SST-LEJ,通过弯曲性能和抗拉压性能的有限元仿真分析,得出SST3-LEJ和SST4-LEJ为4种SST-LEJ当中整体性能较优的两种.将SST3-LEJ和SST4-LEJ与SS-LEJ、Inverted Bending-Orthogonal铰链进行了弯曲性能和抗拉压性能的比较,得出SST3-LEJ和SST4-LEJ的弯曲性能介于SS-LEJ和Inverted Bending-Orthogonal铰链之间,抗拉压性能优于SS-LEJ和Inverted Bending-Orthogonal铰链,说明SST3-LEJ和SST4-LEJ的整体性能较好,达到了预期的设计目的,为大柔度柔性铰链的设计提供了一种思路.     

Calculation of contact stresses in wedge‐pressed welding

Research results of comparative analysis of the carrying capacity of brazed lap joints and brazed double-strap joints of different kinds are given. It is shown that brazed double-strap joints ensure the load-carrying capacity higher than lap joints. The constructions of brazed joints with disc straps as well as in the form of ball segments which have low material capacity are suggested.     

Flexural ductility design of confined high-strength concrete columns: Theoretical modelling

Since the past few decades, high-strength concrete (HSC) has found increasingly wide applications in civil and structural engineering. Its utilisation is needed for the construction of buildings where reductions in self-weight and size of structural members are important. However, it was consistently reported that HSC exhibits undesirably lower ductility with the increase of concrete compressive strength. To restore the ductility, additional confinement has been recommended. This paper investigates the effectiveness of using Steel-Strapping Tensioning Technique (SSTT) to increase the flexural ductility of HSC columns. The effects of SSTT-confinement on the flexural ductility of HSC columns is studied by non-linear moment–curvature analysis. Based on such analysis, a parametric study was conducted to investigate the effects of various parameters, such as normalised axial force, normalised neutral axis depth, concrete compressive strength and confining volumetric ratio, on the flexural ductility of such columns. The results revealed that the flexural ductility of HSC columns is highly dependent on normalised axial force and neutral depth axis of the columns. It was found that the flexural ductility design of SSTT-confined HSC columns can be simplified by controlling the maximum allowable values of these parameters. Finally, two design equations were proposed for the flexural ductility design of such columns.     

GFM型VRLA电池正极汇流排腐蚀机理研究

从 Ｐｂ－Ｃａ－Ｓｎ合金的结构和性能、铅在不同环境中的腐蚀倾向、结合实际使用情况,得出ＧＦＭ型ＶＲＬＡ电池正极汇流排腐蚀是在中性或弱碱性条件下产生的强烈晶间腐蚀的看法,其腐蚀产物主要是 ＰｂＯ·ＰｂＳＯ４,并提出了一些避免正极汇流排腐蚀的途径。     

Status of ITER blanket attachment design and related R&D

Main function of the ITER blanket system [1], [2], [3] is to shield the vacuum vessel (VV) from nuclear radiation and thermal energy coming from the plasma. Blanket system consists of discrete blanket modules (BM). Each BM is composed of a first wall panel and a shield block (SB). The shield block is attached to the VV by means of four flexible supports and three or four shear keys, through key pads. All listed supports do have parts with ceramic electro-insulating coatings necessary to exclude the largest loops of eddy currents and restrict EM loads. Electrical connection of each SB to the VV is through two elastic electrical straps. Cooling water is supplied to each BM by one coaxial water connector. This paper summarizes the recent evolution of the blanket attachment system toward design solutions compatible with design loads and numbers of load cycles, and providing sufficient reliability and durability. This evolution was done in a frame of pre-defined external interfaces. The ongoing supporting R&D is also briefly described.     

Fail-safe design of integral metallic aircraft structures reinforced by bonded crack retarders

This paper presents an investigation on the effectiveness of crack growth retarders bonded to integral metallic structures. The study was performed by both numerical modelling and experimental tests. It focuses on aluminium alloy panels reinforced by bonded straps made of carbon-epoxy, glass-epoxy composite materials or a titanium alloy. The goal was to develop a fail-safe design for integrally stiffened skin-stringer panels applicable to aircraft wing structures. The modelling strategy and finite element models are presented and discussed. The requirements that the models should meet are also discussed. The study has focused on establishing the extent of crack retarder benefits, in terms of fatigue crack growth life improvement, by numerical simulation and experimental tests of various crack retarders. The results of predicted fatigue crack growth retardation have been validated by tests of laboratory samples. This study concludes that by bonding discrete straps to an integral structure, the fatigue crack growth life can be significantly improved.     

对某雷达电视监视器的设计改进

针对已列装的某火控雷达终端电视监视器的问题 ,对电路可靠性进行改进设计 ,在保证与原监视器有良好的机械及电气的互换性前提下 ,设计出一种高可靠性、高集成度、高质量的雷达终端电视监视器 ,并成功地解决了原监视器长期以来存在的黑白竖条干扰问题 ,使显示质量得到了明显提高     

A modelling technique for calculating stress intensity factors for structures reinforced by bonded straps. Part I: Mechanisms and formulation

This paper describes a 2D FE modelling technique for predicting fatigue crack growth life of integral structures reinforced by bonded straps. This kind of design offers a solution to the intrinsic lack of damage tolerance of integral structures. Due to the multiple and complex failure mechanisms of bonded structures, a comprehensive modelling technique is needed to evaluate important design parameters. In this Part I of a two-part paper, the actions and mechanisms involved in a bonded structure are discussed first, followed by presenting the modelling approaches to simulate each mechanism. Delamination or disbond of the strap from the substrate is modelled by computing the strain energy release rate on the disbond front and applying a fracture mechanics criterion. Thermal residual stresses arising from the adhesive curing process and their redistribution with the substrate crack growth are calculated and taken into account in the crack growth analysis. Secondary bending effect caused by the un-symmetric geometry of one-sided strap is also modelled. In the classic linear elastic fracture mechanics, a non-dimensional stress intensity factor, i.e. the geometry factor β, depends only on the sample’s geometry. This β factor cannot be found for this kind of bonded structures, since the magnitude of disbond is related to the applied stress and the disbond size modifies the geometry of the structure. Moreover, secondary bending effect is geometric nonlinear thus the stress intensity factor cannot be normalised by the applied stress. For these reasons an alternative technique has been developed, which requires calculating the stress intensity factors at both the maximum and minimum applied stresses for each crack length. This analysis technique is implemented in a computer program that interfaces with the NASTRAN commercial code to compute the fatigue crack growth life of strap reinforced structures.