厚板滚弯回弹计算新方法

理论分析表明板材弯曲时后继变形中弹性变形所占比例较大,对于Q235而言,其比例达到了10％.新的回弹计算方法考虑了板材后继变形中弹性变形.将文献回弹公式、新的回弹公式与实际使用的经验公式和数值模拟进行对比,对比结果表明：新的回弹公式介于模拟结果与经验公式之间,更接近于经验公式,并且误差在10％以内,成形内半径越大,新旧方法之间的差距越大,新方法的优势越明显.     

Deflection behaviour of plate girders loaded in shear at elevated temperatures

This paper presents a theoretical investigation about out-of-plane and in-plane deflection behaviour of plate girders loaded in shear at elevated temperatures at the pre- and post-buckling stages. Theoretical elastic analysis of plate out-of-plane deflection employs an approximate approach using a combination of classical plate theory and Galerkin’s method. Effects from initial out-of-plane imperfections have been addressed, with the considerations of various varying degrees of thermal restraint. These elastic analytical solutions are compared with experimental results and numerical predictions. In addition to an out-of-plane deflection investigation, a combination of shear strength theory for plate girders and energy method is adopted to describe the in-plane vertical deflection of plate girders. The advantages and implementations of these methods are also discussed.     

基于智能模糊控制的中板加热炉计算机控制系统

本文介绍了中板加热炉计算机智能模糊控制系统的结构及功能，论述了把智能模糊控制方法应用于该加热炉燃烧过程的控制情况和特点。实时控制结果表明。这种控制思想是可行的，能够取得满意的控制效果。     

在线工业镀层及涂层厚度分析仪

产品和金属元件表面镀层或防腐层厚度是与产品质量与性能相关的重要指标。为满足分析要求,介绍了自行研制的同位素X射线荧光分析仪的主要技术方法及具体应用。实际应用效果表明该分析仪在对工业镀层和汽车涂层厚度进行在线测量时其测量精度可达2%～4%,是一种具有快速、简便、无损等优点的新型分析方法。     

中厚钢板60通道在线超声波自动探伤技术的研发

介绍柳钢开发研制热轧中厚板在线自动化超声波探伤技术的历程，以及60通道超声波自动探伤技术及其装置。     

连铸机振动装置的改造

为解决韶钢一钢厂4号连铸机振动装置故障多的问题，提出把全板簧振动装置改造成半板簧振动装置，使改造后连铸机的振动装置通用，统一备件，且节约费用。     

中厚板表面峰状裂纹的成因及预防措施

根据宽板坯投产后遇到的中厚板质量问题，统计分析新钢公司厚板厂表面峰状裂纹产生的主要原因，通过采取相应的措施，改善了连铸坯的表面质量，有效地控制了中厚板表面峰状裂纹的产生。     

直接数字化X线摄影技术

数字X线摄影是指利用电子计算机数字化潜能与常规X线摄影及装置相组合，将其X线信息转换成数字形式，经后处理成像的方法。 直接数字X线摄影是在上述基础上省略信息采集中的中间传递环节，具有成像快，影像质量高的特征。 本文对直接数字化成像技术的特点、构造、工作原理、影像质量等进行概述。     

The distributed dislocation technique for calculating plasticity-induced crack closure in plates of finite thickness

An analytical method for calculating plasticity-induced fatigue crack closure in plates of finite thickness is presented. The developed method utilizes the distributed dislocation technique (DDT) and Gauss-Chebyshev quadrature. Crack tip plasticity is incorporated by adopting a Dugdale type strip yield model. The finite plate thickness effects are taken into account by using a recently obtained three-dimensional solution for an edge dislocation in an infinite plate. Numerical results for the ratio of the size of the crack tip plasticity zones are presented for the cases of uniform thickness wake and linearly increasing wake for a range of plate thickness to crack length ratios and applied load ratios. The results show a very good agreement with previous analytical solutions in the limiting cases of very thick and very thin plates. Further results for the opening stress to maximum stress ratio are also provided and are compared with known three-dimensional finite element (FE) solutions. A good agreement is observed. The developed method is shown to be an effective and very powerful tool in modeling the crack closure phenomenon.     

Behavior of bridge girders with corrugated webs under monotonic and cyclic loading

The focus of this study is to investigate the behavior of plate girders with trapezoidally corrugated webs under fatigue loading. Six girders were tested under both monotonic and cyclic four-point loading arrangements. A relationship between the stress range, F_r, and the number of cycles to failure, N, was developed for the girders. The results from the fatigue tests were related to the current AASHTO specifications and compared with the test results of different types of girders carried out by others. Nonlinear finite element analyses were conducted to study the effects of the different geometrical parameters of this type of girders on the stress concentrations at different locations and to explain the findings of the experimental study. Two sources of stress concentration leading to fatigue cracking were isolated and evaluated; one is dependent on the radius of curvature between the web folds and the other depends on the inclination angle of the inclined fold. An analytical technique based on fracture mechanics is also proposed to enable designers to determine the fatigue life of corrugated web steel girders.