耐磨耐腐蚀弯管的研制

为解决火力发电厂弯管的磨损和腐蚀问题，研制出新型镶铸型和卡箍型耐磨、耐蚀弯管，提高了弯管的耐磨和耐蚀性能，其使用寿命是普通合金钢和铸钢管的3～5倍，而且维修方便、成本低，已成功用于多家大型电厂。     

汽车钢化玻璃生产过程中加热与成型方法

汽车钢化玻璃因曲面形状、面积尺寸不同而采取不同的成型方法、加热方式和淬冷方法.文章阐述了角窗、门窗和后窗玻璃的加热、成型及冷却.     

气力输送中弯管磨损的影响因素及解决办法

概述了气力输送中弯管磨损的机理,详细阐述了气力输送过程中物料的物性、输送气速、料气比、弯管的结构及形状等主要因素对弯管磨损的影响。重点分析了输送气速的影响,并从弯管材料和结构2方面论述了减少弯管磨损的办法,建议用短半径和一端不通T型弯头代替长半径弯头。     

木结构的性能

对张弦木梁试件弹性模量、抗弯强度及梁的含水率的测定进行了试验分析,得出相应的试验结果,分析了影响木材强度的因素,最后得出木节及缺陷对木材顺纹抗拉强度影响很大,张弦木梁以受拉区先破坏的结论。     

换热器盘管焊接现状及改进方向

分析了换热器盘管中存在的结构和质量问题，提出了采用带颈多通道和回弯头的套接结构方法，并认为这一方法符合规范，是提高质量的有效方法。     

连续梁曲线桥支座反力的分析

由于"弯扭耦合"作用,在自重作用下的曲线桥内外侧支座反力会出现较大的差值,甚至出现负反力,所以在工程中需要引起注意。着重分析边跨比、圆转角、桥长以及变截面形式对支座反力的影响。最后给出了上述因素对支座反力大小影响的结论。     

Dynamic notched semi-circle bend(NSCB) method for measuring fracture properties of rocks:Fundamentals and applications

Rocks are increasingly used in extreme environments characterised by high loading rates and high confining pressures.Thus the fracture properties of rocks under dynamic loading and confinements are critical in various rock mechanics and rock engineering problems.Due to the transient nature of dynamic loading,the dynamic fracture tests of rocks are much more challenging than their static counterparts.Understanding the dynamic fracture behaviour of geomaterials relies significantly on suitable and reliable dynamic fracture testing methods.One of such methods is the notched semi-circle bend(NSCB) test combined with the advanced split Hopkinson pressure bar(SHPB) system,which has been recommended by the International Society for Rock Mechanics and Rock Engineering(ISRM) as the standard method for the determination of dynamic fracture toughness.The dynamic NSCB-SHPB method can provide detailed insights into dynamic fracture properties including initiation fracture toughness,fracture energy,propagation fracture toughness and fracture velocity.This review aims to fully describe the detailed principles and state-of-the-art applications of dynamic NSCB-SHPB techniques.The history and principles of dynamic NSCB-SHPB tests for rocks are outlined,and then the applications of dynanic NSCB-SHPB method(including the measurements of initiation and propagation fracture toughnesses and the limiting fracture velocity,the size effect and the digital image correlation(DIC) experiments) are discussed.Further,other applications of dynamic NSCB-SHPB techniques(i.e.the thermal,moisture and anisotropy effects on the dynamic fracture properties of geomaterials,and dynamic fracture toughness of geomaterials under pre-loading and hydrostatic pressures) are presented.     

ANSYS在除尘管道内流场分析的应用

利用ANSYS软件中FLOTRANCFD对除尘管道的弯管处气体流场进行建模、分网、加载、分析后 ,得出了气流流经弯管处的压力分布云图和速度矢量分布图 ,正确反映了气流在流经弯管时速度和压力的变化 ,找出了造成压力损失的主要原因 ,为除尘系统的设计提供了一个合理的依据     

Modelling the quasi-static behaviour of bituminous material using a cohesive zone model

This paper investigates the applicability of a cohesive zone model for simulating the performance of bituminous material subjected to quasi-static loading. The Dugdale traction law was implemented within a finite volume code in order to simulate the binder course mortar material response when subjected to indirect tensile loading. A uniaxial tensile test and a three-point bend test were employed to determine initial stress-strain curves at different test rates and the cohesive zone parameters (specifically, fracture energy and cohesive strength). Numerical results agree well with the experimental data up to the peak load and onset of fracture, demonstrating the value of the cohesive zone modelling technique in successfully predicting fracture initiation and maximum material strength.     

天然气长输管道建设中有关问题的探讨

结合实际工程,探讨了天然气长输管道工程中线路选线、线路用热弯弯管及厂站用无缝钢管的材料替代、厂站压力容器设计、阀室设计等问题.