80 kt/a硫铁矿制酸扩建装置采用的新技术措施

针对采用水洗净化工艺的某80kt/a硫铁矿制酸装置的扩建设计，介绍了其中主要改扩建工段及设备采用的新技术措施，设计中对原料工段、沸腾炉、文氏管、泡沫塔、转化器、换热器等进行了改进，满足了厂方两期建设产量不同的要求。     

Residual strength prediction of multiple cracked stiffened panels

Prediction of the coalescence of adjacent cracks is critical for residual strength estimation of structures under multiple site damage conditions. A methodology successfully developed for the case of crack link‐up prediction of un‐stiffened plates, is extended for the case of typical cracked stiffened aircraft panels. The proposed link‐up criterion is based on the change in the magnitudes of elastic and plastic strain energies of the stiffened panel, before and after the cracks coalesce. The strain energy magnitudes of interest are calculated using non‐linear elastic–plastic finite‐element analysis. For the application and verification of the method, experimental results from the open literature are used. Residual strength values calculated by the proposed methodology are in good agreement with the experimental results. The present criterion provides superior results when compared to the existing and commonly applied link‐up criteria.     

工程机械中液压管路件常见故障原因分析及解决办法

液压管路件作为液压系统的一个重要组成部分,在实际应用中经常会产生诸如渗漏、开裂等故障,就工程机械中常见液压管路件的故障产生原因进行了分析,并提出相应的解决办法。     

模糊综合评判法在装备采购招标中的应用

根据我军武器装备采购招标的必要性和可行性，以及传统装备采购招标方法的局限性．详细阐述了在装备采购招标中运用模糊综合评判法进行评标的基本原理和主要步骤，并通过一个实例验证了模糊综合评判法在装备采购招标中的可行性和科学性。     

贵冶VPSA制氧机作业率攻关与改造

阐述了江铜贵溪冶炼厂二期工程引进的一套3800m3/h真空变压吸附制氧机(简称VPSA)的基本原理、工艺特点,分析了实际运行过程中周期短、作业率低的主要原因,采取了相应的技术改造和维护措施。     

湿式储气罐防腐失效原因分析及改进措施

分析了济钢10万m3低压湿式储气罐防腐失效的原因,从防腐涂料的选择、施工过程等环节提出了改进的措施,实施后效果良好。     

中小型铝电解厂供电系统调度运行方式的探讨

公司2 0 0kA电解槽投产后,用电负荷增大,自备电厂负荷小,不能满足生产需求,由于所在地区电网薄弱,供电不稳定,特别是遇到发、供电设备检修和突发故障时,电流强度波动大,对电解槽生产影响较为严重。根据这种现状,经过长期运行实践,制定了不同设备检查及故障状态下35kV发、供电系统生产调度运行的最佳方式,保证了企业正常生产,提高了企业经济效益     

Investigation of failure mechanism and modification for film-lubricated precise angular-contact ball bearing

This paper describes an experimental investigation into the performance and lubrication failure mechanism of precise angular-contact ball bearings treated with MoS₂-sputtered film, etc. As an important executive component of various spacecrafts, there are some strict requirements on the lubrication performance of angular-contact ball bearing, but the related experimental data are rare to see in literatures. In this experiment, the lubrication performances of MoS₂-sputtered ball bearing pairs were evaluated by using lifetime test as a main method, and the topographies and compositions of working surfaces were investigated through SEM, AES and EDS. The systematical experiment results reveal that the degradation and failure process of solid lubrication for such ball bearing is divided into three stages with different characters. A supposed failure mechanism has been proposed. An improved lubrication treatment based on above mechanism was conducted for the precise ball bearings, and a later test showed that long endurance life with more than 10⁸ revolutions has been reached.     

Fatigue life calculation by means of the cycle counting and spectral methods under multiaxial random loading

The paper contains a new algorithm for estimation of fatigue life in HCF regime under multiaxial random loading using spectral methods. Loading of Gaussian distribution and narrow‐ and broad‐band frequency spectra were assumed. Various characteristic states of multiaxial loading were considered. The equivalent stress history was determined with use of the failure criteria of multiaxial fatigue based on the critical plane. For determination of the critical plane position, the method of variance was applied. During simulation, the authors compared the results obtained by a spectral method in the frequency domain with those from the rain‐flow algorithm in the time domain. The paper also contains the results of fatigue tests for 18G2A structural steel subjected to bending and combined bending with torsion. The tests were performed in order to verify the proposed algorithms for determination of fatigue life. It has been shown that under multiaxial random loading results of fatigue life calculated according to the considered algorithms in frequency and time domains are well correlated with the results of experiments.     

钢丝圈的失效分析

对72B纺织用钢丝圈进行失效分析，发现钢丝圈使用性能不合格的主要原因是热处理炉仪表指示温度偏差太大及热处理工艺规范不合理，使得球化退火后的金相组织出现粗晶铁素体，淬火和回火后的金相组织出现铁素体、粒状渗碳体，使材料塑性增加，满足不了使用性能。