泄压注浆法在治理小型突水中的运用

七煤集团建设工程公司在施工辽阳铧子石膏矿主、风井井筒时 ,多次采用泄压注浆法成功通过中小型含水层 ,对小型突水进行了有效封堵 ,取得了较好的经济效益     

基于数值模拟的等效拉延筋设计与优化

拉延筋在汽车覆盖件拉深成形中起着十分重要的作用。利用拉延筋可以在较大范围内调节和控制板料的变形程度和变形分布,抑制破裂、起皱、面畸变等多种冲压质量问题的产生。在很多情况下,拉延筋的设置合理与否将决定覆盖件拉深的成败。文章借助eta/DYNAFORM软件,模拟某轿车B柱加强板在无/有拉延筋的模具上进行拉深的全过程,通过模拟结果分析比较,确定拉延筋的合理布局及数量,最后结合正交实验法,优化拉延筋的结构参数。     

钢梁外包FRP混凝土抗弯承载力计算

目的研究一种简化处理的不同破坏形态下构件极限抗弯承载力的计算方法,以方便工程实际的应用.方法采用实用叠加方法对SRHC梁贴FRP的受力过程和破坏特征进行研究.根据中和轴到钢骨的截面距离不同,将受压区高度与钢骨上翼缘至混凝土受压边缘的距离进行比较,以此来确定FRP加固后梁在破坏时的不同抗弯承载力的适用公式.基于纤维模型法,对受弯钢梁外包混凝土贴FRP布构件进行非线性全过程分析.结果提出了受弯钢梁外包混凝土贴FRP布构件承载力计算公式.通过实例表明,FRP的加固层数是构件受力性能重要的影响参数,在相同的变形条件下,FRP层厚度增加,组合构件的承载能力也有所提高,最佳加固率在3层以内.构件的承载能力随着混凝土强度的提高而提高.结论笔者给出的计算公式克服了简单叠加法和一般叠加法在计算上的缺陷,计算简便,可用于工程实际和结构设计中.     

强化均匀化对7B04铝合金铸态组织与性能的影响

研究了强化均匀化 (大幅度延长均匀化时间 ,略高于传统均匀化温度 )对 7B0 4铝合金铸态组织和性能的影响。结果表明 :在 4 6 8℃× 4 8h的均匀化制度下 ,材料的铸态组织得到明显的改善 ,非平衡凝固形成的多相组织基本上转变成均匀化组织 ,材料的伸长率较传统均匀化提高 14 % ,为后续压力加工和热处理奠定了基础。     

Novel process for cover glass with ideal stress distribution

Abstract — This paper proposes a new process to manufacture cover glass that overcomes a strength trade‐off between the face and the edge. In the process, alkali barrier films are deposited on glass faces before an ion exchange process in order to control face stress properties without inhibiting the edge strengthening. As a demonstration of the process, alkali‐alumino‐silicate glass sheets with sputter‐deposited SiO₂ films were chemically strengthened, and then their stress properties and strengths were investigated. As a result, thicker SiO₂ films cause lower face DOL (depth of strengthened layer), and it is observed that the faces have lower DOL than the edges. In strength tests corresponding to major fracture modes of smartphone cover glass, specimens with 80–100 nm films have more balanced face performance and better edge impact strengths than the no‐film specimen.     

顶部设置加强层的框-筒结构应变能分析

针对带加强层的框-筒结构体系，为考虑普通楼层梁的影响将其等效为沿竖向分布的连续介质，同时计入加强层梁、核心筒、普通楼层梁、外框柱的剪切应变，推导出了顶部设置加强层的框筒结构在水平荷载作用下应变能的表达式，为推导此类结构在水平荷栽作用下的侧移打下了基础，同时也为求解此类结构在水平荷载作用下的内力提供了方便。     

双束强辐照对氧化物弥散强化铁素体型合金强化相稳定性影响

采用双束复合辐照装置,研究了He存在条件下,强辐照对长期时效后的ODS合金中强化相(Y2O3)的稳定性和辐照损伤特征的影响。实验结果表明:双束强辐照下,ODS合金中强化相不稳定,发生聚集长大并造成附近基体中Ti、Y浓度增高,导致空洞尺寸和空洞肿胀增加,并对这一结果从理论上进行解释。     

A comparison between classical robust stability conditions

The paper is focused on the comparison between some classical robust stability conditions for continuous‐time linear time‐invariant systems. Such conditions are given as lemmas in the paper, since their statements include some generalizations, needed in order to better compare (and use) them. The analysis is carried out by comparing pairwise the families of systems whose stabilization through a given compensator is guaranteed by each of the considered robust stability conditions. Some properties of the families are formally derived and stated, and some very simple examples arc exhibited in order to illustrate the presented properties and comparisons. A theorem, representing an extension of one of the considered conditions, is proposed in order to overcome some difficulties arising in the use of the classical result. Copyright © 2004 John Wiley & Sons, Ltd.     

经向夹衬加强筋机织物及双引纬织造的研究

提出经向夹衬加强筋机织物的结构,介绍其形成原理及方法,并通过实验及讨论,提出双梭口织机引纬、打纬、送经和卷取机构的改造方案。该结构改善了纤维或纱线在织物及其复合材料中的空间分布形态,从而也能加强其物理机械性能,扩大应用领域。     

玻璃钢板加固既有混凝土梁界面应力分析

对玻璃钢板加固既有混凝土梁界面应力进行了理论计算和有限元分析,研究了不同玻璃钢板长度、厚度对界面应力的影响,得到了界面应力随玻璃钢板长度、厚度变化的规律。有限元计算结果与理论结果吻合较好。