Creep damage characterization of UNS N10003 alloy based on a numerical simulation using the Norton creep law and Kachanov–Rabotnov creep damage model

The calculation of inelastic creep damage is important for the structural integrity evaluation of the elevated temperature structure in a thorium molten salt reactor(TMSR). However, a creep damage theory model and numerical simulation method have not been proposed for the key materials(UNS N10003 alloy) in the TMSR. In this study, creep damage characterization of UNS N10003 alloy is investigated using the Norton creep law and Kachanov–Rabotnov(K–R) creep damage model. First, the creep experimental data of the UNS N10003 alloy at 650 °C were adopted to fit the material constants of the two models. Then, the creep damage behavior of the UNS N10003 alloy was analyzed and discussed under uniaxial and multi-axial stress states. The results indicated that the K–R creep damage model is more suitable for the UNS N10003 alloy than the Norton model. Finally, the numerical simulation method was developed by a user-defined UMAT subroutine and subsequently verified through a finite element analysis(FEA). The FEA results were in agreement with the theoretical solutions. This study provides an effective method for the inelastic creep damage analysis of the elevated temperature structure in the TMSR.     

A New Chiral Cu(II) Complex Consisting of Achiral Flexible Tripodal Ligand of Benzene-1,3,5-Triacetate Acid with Phenanthroline

Abstract  

A new chiral Cu(II) complex, Cu₃(phen)₃(H₂O)(BTA)₂·13H₂O (1) (H₃BTA = benzene-1,3,5-triacetate acid and phen = phenanthroline) has been prepared by solvothermal synthesis and structurally characterized by IR, elemental analysis, and single crystal X-ray diffraction. This complex crystallizes in the chiral space group C2 and has similar one-dimensional chains, which are further bridged by μ ₂-H₂O to form a two-dimensional layer structure. The nonlinear optical property and magnetic property were investigated.     

Q460C低合金结构钢的焊接

从理论上分析了Q460C低合金结构钢焊接性能。并针对液压支架结构件的使用环境和性能要求,就焊材、焊前准备、焊接工艺、焊后热处理等几个方面提出了一些要求,并从理论上对这些要求进行了可行性分析,以保证支架结构件获得良好的综合机械性能。     

冷拔工艺技术在液压支架千斤顶上的应用

介绍以热轧无缝钢管为坯料的高精度冷拔油缸在液压支架千斤顶上的应用,并从选材、工艺过程,应用机理,产品的机械性能、防腐性能及节约降耗等几个方面,阐述采用高精度冷拔技术生产制造支架千斤顶油缸能够满足其使用要求,具有广阔的应用前景。     

拉曼光谱技术在农畜产品品质安全检测中的进展

本文综述了拉曼光谱技术应用于农畜产品品质安全检测的研究进展,从原理及分类出发,以各个技术方向为框架介绍拉曼光谱技术在农畜产品各个方面的进展,并分析实际问题,提出发展趋势。作为无损检测技术的重要支撑技术,拉曼光谱检测技术已经被开发应用于农畜产品品质安全检测的各个方面。激光拉曼光谱技术的成熟推动了拉曼光谱检测技术蓬勃发展,傅立叶拉曼光谱技术、显微拉曼光谱技术、共振拉曼光谱技术和表面增强拉曼光谱技术在农畜产品品质安全检测方面均具有巨大的潜力。     

机载红外搜索跟踪技术研究

文中介绍了红外搜索和跟踪系统的主要子系统,其中包括瞄准与稳定子系统、热成像子系统和图像跟踪处理子系统。     

一种容灾中间件的设计与实现

在分析大规模分布式应用的特点以及建立容灾系统存在问题的基础上,提出了一种使用中间件进行容灾的思想,并设计和实现了一种容灾中间件,该中间件有效地实现了容灾的透明化;另外,将失效检测部件加入到容灾中间件中,并对原有的失效检测算法进行改进,实验证明改进的算法能够提高检测的准确率。该容灾中间件在实际应用中取得了良好的效果。     

SZL20-1.6-AⅡ锅炉节能技术改造

本文针对SZL20－1．6－AⅡ锅炉存在的问题，提出了改进措施，经实施效果显著。     

来宾电厂改扩建工程电气主接线方案研究

根据来宾电厂改扩建工程的实际情况，从技术、经济上介绍工程电气主接线及高压出线的各个不同方案的优缺点，通过分析比选，得出最优推荐方案。