失效分析程序

机械失效常常会出现多个机件发生失效，特别是机械事故发生的时候，往往有大量机件同时遭到破坏，情况相当复杂，而失效原因也错综复杂、多种多样。因此，需要有正确的失效分析思路和合理的失效分析步骤。失效分析的实施步骤和程序旨在保证失效分析顺利有效地进行，但是机械产品的失效常常是千变万化，很难制定一个统一的失效分析程序。因此，     

聚能装药侵彻靶后破片的空间分布特征

准确掌握靶后破片的空间分布规律是有效开展聚能装药对装甲目标内部环境毁伤效应评估的先决条件。通过试验和有限元仿真对典型聚能装药侵彻不同倾角靶板产生靶后破片过程进行了研究,结果表明:射流穿透靶板瞬间,大量碎片在靶后形成"椭圆体"破片云,随着靶板倾角增大,靶后破片云朝着靶后法线一侧偏转,其水平截面(与射流轴线垂直的截面)由圆形逐渐变为椭圆,但靶后破片间最大飞行夹角始终保持在90°左右。     

聚能装药垂直侵彻靶后破片的散布规律

靶后破片是造成装甲内部环境二次毁伤的主要媒介,准确掌握其在靶后一定距离和面积上的散布规律具有重要意义。通过X光试验和有限元数值模拟对靶后破片云形态特征进行了研究,建立了破片速度散布的数学模型,并通过后效铝板获得了破片的散布情况,得到了不同厚度靶板下破片速度、破片数量等特征参数随飞散角的变化规律,为聚能装药毁伤效应评估提供参考。     

ECONOMIC ACCEPTANCE SAMPLING BY VARIABLES WITH QUADRATIC QUALITY COSTS

An economic model is developed, to assist in the selection of minimum cost acceptance sampling plans by variables. The quadratic Taguchi loss function is adopted to model the cost of accepting items, with quality characteristics deviating from the target value. The case of a normally distributed quality characteristic with known variance is examined, and a simple and efficient optimization algorithm is proposed. Comparisons with other methods of deriving sampling plans reveal that the cost penalties for using an inappropriate plan may be very large.     

聚能装药侵彻靶后破片的空间分布特征

准确掌握靶后破片的空间分布规律是有效开展聚能装药对装甲目标内部环境毁伤效应评估的先决条件。通过试验和有限元仿真对典型聚能装药侵彻不同倾角靶板产生靶后破片过程进行了研究,结果表明:射流穿透靶板瞬间,大量碎片在靶后形成椭圆体破片云,随着靶板倾角增大,靶后破片云朝着靶后法线一侧偏转,其水平截面(与射流轴线垂直的截面)由圆形逐渐变为椭圆,但靶后破片间最大飞行夹角始终保持在90°左右。     

履带式装甲车辆的空气滤清器应如何改进

本文论述的主要是履带装甲车辆的空气滤清器长期使用存在的问题,并且针对问题提出改进的方法.     

聚能装药垂直侵彻靶后破片的散布规律

靶后破片是造成装甲内部环境二次毁伤的主要媒介,准确掌握其在靶后一定距离和面积上的散布规律具有重要意义。通过X光试验和有限元数值模拟对靶后破片云形态特征进行了研究,建立了破片速度散布的数学模型,并通过后效铝板获得了破片的散布情况,得到了不同厚度靶板下破片速度、破片数量等特征参数随飞散角的变化规律,为聚能装药毁伤效应评估提供参考。     

CREEP BEHAVIOUR OF FULL-SIZE WELDED JOINTS: DEFECT ACCEPTANCE CRITERIA

In order to explore the creep crack growth behaviour in welds of real components, creep tests were performed at 600 °C on large specimens made of 316L(N) stainless steel plates. Manual Metal Arc (MMA) welds were investigated. The overall deformation of the specimens, and in many instances the local deformations of the welds, were recorded. The evolutions of the defects were followed by potential drop techniques. The experimental results were compared with two-dimensional finite element computations, based on the creep behaviour of the base and weld metals, determined with small standard specimens. The time to creep crack growth initiation was correlated with the C * parameter determined from the load–displacement rate. The times to initiation of creep crack growth were compared with evaluations using the RCC-MR code and R5 rules, as well as other methods, in particular those derived by finite elements analysis     

控制振动速度条件下高边坡爆破的施工方法与验收标准

在对爆破振动速度控制有一定要求的条件下,利用预裂爆破的减震效果,进行高边坡爆破的设计和施工。本文结合一码头土石方工程,介绍了预裂孔、缓冲孔及主爆孔的爆破参数、装药结构、起爆网路的选择与确定,并论述了边坡爆破施工的要求和注意要点,以及露天边坡验收标准。     

控制振动速度条件下高边坡爆破的施工方法与验收标准

在对爆破振动速度控制有一定要求的条件下,利用预裂爆破的减震效果,进行高边坡爆破的设计和施工。本文结合一码头土石方工程,介绍了预裂孔、缓冲孔及主爆孔的爆破参数、装药结构、起爆网路的选择与确定,并论述了边坡爆破施工的要求和注意要点,以及露天边坡验收标准。     

A NUMERICAL PROCEDURE FOR SENSITIVITY ANALYSIS IN GEOMETRIC PROGRAMMING

This paper presents a development of sensitivity analysis (post optimal) for non-linear optimization problems. The basis for this development is the optimization technique known as geometric programming. Efficient procedures are developed which relate changes in the coefficients to the new design variables. The procedure is used to analyze the design of a condenser.