A mesomodel for the numerical simulation of the multiphasic behavior of materials under anisothermal loading (application to two low-carbon steels)

The determination of residual stresses induced by welding or heat treatment operations requires the use of complex models taking into account thermal, metallurgical and mechanical phenomena. In this paper, we propose a mechanical model in which each phase can follow its own constitutive law. This model also takes into account phase transformation plasticity, which is treated independently of the behavior of each phase. This model has been implemented into the French FEM code Castem 2000. The interest of the proposed method is that it allows one to mix any type of nonlinear behavior using Taylor homogenization hypothesis. There is no need to develop a theory to get the equations of the homogenized material law. Two numerical examples demonstrate the efficiency and the flexibility of this approach. The results obtained are compared to experimental values for a typical welding situation and a high-temperature response. This comparison seems to indicate that viscous effects in the materials have a significative influence on the residual stresses produced by welding.     

填料萃取塔的操作性能及设计计算

系统地介绍了填料抽提塔的两相流动及传质特性，设计计算，对填料塔的设计和操作有一定指导意义。     

HYSIM软件模拟天然气加工工艺流程的研究(Ⅰ)——系统中无循环物流

本文结合大庆油田天然气矿场加工实际生产装置,讨论了应用HYSIM烃类工艺模拟软件对含有不确定组分的体系进行流程模拟计算的特点、塔设备严格模拟计算过程中输入规定的选择、以及多股流换热器和吸附脱水工艺的模拟计算方法。     

回转体拉深件毛坯直径的简捷计算及误差分析

通用的回转体拉深件毛坯直径的计算公式繁琐，不蝗记忆，特别是利用中线尺寸常出现小数点使计算复杂，本文针对此问题分别推导出了利用中线尺寸和不用中线尺寸时，毛坯直径的简捷计算公式。并进行了误差分析，最后用实例对简捷计算方法的正确性给予了验证。     

桩柱式采金船每帮挖方量的理论计算

本文从理论上推导出了桩柱式采金船每帮挖方量计算的数学模型并，可广泛地用于设计与生产中，从而提高采金船设计的准确性，以及对生产矿山进行矿量、回收率和实收品位等采选指标收测的可靠性。     

数值方法确定地基承载力特征值的探讨

介绍了目前地基承载力的确定方法，研究了数值计算的可行性，并对其数值计算地基承载力的可靠性进行验证，指出应进一步完善确定地基承载力的方法，更好地解决群桩基础承载力的确定问题。     

Analyses and Solutions of Specific Cases in Spatial Angles Calculation

1 Introduction “Spatial Angles Calculations” means that all the calculations of given and unknown parameters are related to calculating angles in 3D space. The functions and relevant parameters in 3D space are much more complicated than that in 2D space, i.e. on a plane. Professor Sun, based on his research conducting for more than a decade, presented a series of new algorithms to calculate angles in space which are valuable in both theory and applications[1]. The authors found that, in g…     

供电器可供放大器最大级数的计算

有线电视电缆网采用供电器进行集中供电，要计算一个额定容量的供电器可供放大器的最大级数，算式是很复杂的，而用VisaulFOXPRO6．0编写一个小程序，利用电脑对上述问题进行处理，就变得简单易用。     

分流液压转向牵引计算的展开图及其应用

本文论及分流液压转向牵引计算的概念,方法及其展开图,并且提供了计算机绘制的展开图和应用实例。     

渭河流域水利水保措施减水减沙效益初步分析

截止1989年底,渭河流域共有水库361座,塘坝2666座,引水有效灌溉面积40.4万公顷,治理总面积8136km~2,治理度17.1％。以1970年为效益计算起始年,并将全流域划分为18个片,分别采用水文法和水保法计算1970～1989年间各项水利水保措施减水减沙量及综合减水减沙效益。水文法算得的综合减水效益为24.1％,减沙效益为30.6％;水保法算得的结果相应为29.9％和30.8％,两者相近。