振动时效工艺在岔管消应中的应用

振动时效技术是一项已在我国许多行业推广使用的节能技术，通过对振动时效工艺在汤浦水库岔管中的实际应用，说明结合该项技术能在岔管残余应力消除中取得良好的效果。     

水泥砼路面胀缝设置与板内温度应力的分布

水泥砼路面胀缝破坏是路面工程常见疾害之一,分析路面温度变化、应力、变形间的关系、合理设置胀缝,将提高砼路面使用年限,获得较好的行车条件。     

瓦楞辊中频感应淬火热裂的有限元分析

用有限元方法建立了瓦楞辊中频感应淬火模型，分析了瓦楞辊各参数变化时对热应力分布的影响，探讨了热处理过程中楞齿变形及热裂的原因。     

直埋供热管道弯头的壳体应力分析

依据弯头实际工程物理模型，将直埋管道弯头作为环壳的一部分，在相应曲线坐标系中对其进行了受力分析(包括内压、埋土压力、热胀力、土壤与管道之间的摩擦力、土体对管道的压缩反力等)。应用弹性薄壳理论，建立平衡方程，并采用半逆解法，参考李维解和纳维叶解，在理论上首次得出直埋供热管道弯头部分的位移解析解，依据该解析解易得出精确的应力解答。     

低拉应力下12Cr1MoV钢中P原子的晶界非平衡偏聚

对低应力作用下12Cr1MoV钢中磷原子的晶界偏聚现象进行了俄歇能谱实验研究和动力学分析．实验获得了在30MPa拉应力作用下，磷原子在晶界处发生的非平衡晶界偏聚，临界时间是1h．分析表明，低拉应力极大地提高了磷-空位复合体在钢中的扩散速率，低拉应力引起的晶界变形对磷-空位复合体具有强烈的吸引作用．通过动力学计算给出了磷-空位复合体偏聚阶段扩散系数Dc和磷原子反偏聚扩散系数Di随时间变化的表达式．     

预电应力对硅橡胶改性环氧树脂固化物结构形态的影响

针对预电应力对硅橡胶改性环氧树脂固化物微观结构形态影响的问题，通过实验研究发现，在硅橡胶改性环氧树脂的固化过程中施加直流预电应力后，固化物中的硅橡胶颗粒粒径变小，数量变多，同时这种影响与预电应力的极性无关，而与预电应力强度有关．     

Behavior of pre-stress group anchors——Theory approach and model

First of all the pre-stress group anchor ropes are resolved into twosub-systems: the stable rock stand lateral resistance load and inner bonding sectionstand lateral resistance load and pre-stress load. Then, discretization of everysub-system was carried on and it is assumed that different micro-sections possessuniform distribution side resistance. On the basis of Mindlin stress solution, stress overlay principle, modified layered-summation method as well as the load transfer method, westudy the anchor group effect and present a theory model which calculates the anchorgroup effect and establishes the relevant iterate standard.     

Modeling of Temperature and Residual Stress Fields Resulting from Impacting Process of a Molten Ni Particle onto a Flat Substrate

1　IntroductionAmoltenmetalparticleimpactingontoasubstrateundergoesrapiddeformationasitspreadsintoathinfilm ,associatedwiththeheattransferandthegenerationofthermalresidualstress .Thisprocessisofbroadgeneralimportanceinthermalsprayoperations ,becausethefinalflatteningshape ,thetemperaturedistributionandthere sidualstressfieldsareallrelatedtothemicrostructureofthethermalsprayingcoatings ,thusfurtheraffectingthequalityofthecoatings .Thesephysicalphenomenaareverycomplexandoccuroveraveryshorttimesc…     

Web应用程序压力测试

Web应用程序多客户并发访问、处理相对集中在服务器端的特点使其测试不同于一般应用程序的测试。文中介绍了Web应用程序压力测试的相关概念、测试流程及一些测试工具，并给出了一个压力测试实例。     

Optimization of practical trusses with constraints on eigenfrequencies, displacements, stresses, and buckling

In this paper we consider the optimization of general 3D truss structures. The design variables are the cross-sections of the truss bars together with the joint coordinates, and are considered to be continuous variables. Using these design variables we simultaneously carry out size optimization (areas) and shape optimization (joint positions). Topology optimization (removal and introduction of bars) is only considered in the sense that bars of minimum cross-sectional area will have a negligible influence on the performance of the structure. The structures are subjected to multiple load cases and the objective of the optimizations is minimum mass with constraints on (possibly multiple) eigenfrequencies, displacements, and stresses. For the case of stress constraints, we deal differently with tensile and compressive stresses, for which we control buckling on the element level. The stress constraints are imposed in correlation with industrial standards, to make the optimized designs valuable from a practical point of view. The optimization problem is solved using SLP (Sequential Linear Programming).