Sensitivity of direct metal laser sintering Maraging steel fatigue strength to build orientation and allowance for machining

This work deals with the effect of build orientation and of allowance for machining on DMLS‐produced Maraging Steel MS1. The experimental results, arranged by tools of Design of Experiment, have been statistically processed and compared. The outcomes were that, probably due to effect of the thermal treatment, machining, and material properties, the aforementioned factors do not have a significant impact on the fatigue response. This made it possible to work out a global curve that accounts for all the results, consisting in a high amount of data points. This can be regarded as one of the most complete and reliable fatigue models in the current literature. Fractographic and micrographic studies have been performed as well, to individuate the crack initiation points, usually located at subsurface porosities, and to investigate the location of internal inclusions and the actual martensitic microstructure along the stacking direction and on the build plane.     

Informing additive manufacturing technology adoption: total cost and the impact of capacity utilisation

Informing Additive Manufacturing (AM) technology adoption decisions, this paper investigates the relationship between build volume capacity utilisation and efficient technology operation in an inter-process comparison of the costs of manufacturing a complex component used in the packaging industry. Confronting the reported costs of a conventional machining and welding pathway with an estimator of the costs incurred through an AM route utilising Direct Metal Laser Sintering (DMLS), we weave together four aspects: optimised capacity utilisation, ancillary process steps, the effect of build failure and design adaptation. Recognising that AM users can fill unused machine capacity with other, potentially unrelated, geometries, we posit a characteristic of ‘fungible’ build capacity. This aspect is integrated in the cost estimation framework through computational build volume packing, drawing on a basket of sample geometries. We show that the unit cost in mixed builds at full capacity is lower than in builds limited to a single type of geometry; in our study, this results in a mean unit cost overstatement of 157%. The estimated manufacturing cost savings from AM adoption range from 36 to 46%. Additionally, we indicate that operating cost savings resulting from design adaptation are likely to far outweigh the manufacturing cost advantage.     

遥感技术在安徽电力建设中的应用

遥感技术是一项高性能的空间技术,应用领域广阔。本文介绍了十余年来在安徽电力建设中应用遥感技术的工程实例,指出了尚存在的问题并提出今后要充分利用遥感技术。     

英语词汇教学中的记忆品质培植

为了提高英语学习者的记忆力,有效地培植良好的记忆品质,通过分析英语学习者的生理和心理特征,依托认知心理语言学和联结理论,论述了在日常的英语词汇教学中,要把认知心理语言学和联结理论与对学生记忆品质的培植有机结合起来,形成长期记忆和短期记忆相互融合的记忆模块,建构记忆网络。     

强化思想政治工作构建和谐企业

在国有大企业中,或具有一定规模的民营企业中,强化思想政治工作是一个不容忽视的工作内容。因为,思想政治工作是办好一切事情的保障,它在构建和谐企业的过程中是重要的基础工作,并将产生着很重要的积极作用。     

计算机辅助夹具设计中的定位误差分析与建模

提出了在计算机辅助夹具设计中工件定位矩阵的表达式，并在此基础上进行了定位误差分析，建立了定位误差的通用数学模型，为在计算机辅助设计中全面的误差分析计算提供了理论基础。     

现代城市更新方法与思考

对城市更新的概念和主要模式进行了分析,从城市更新在国内发展所遇到的误区论述了目前的困境,提出现阶段在国内进行城市更新的几点建议,以期为新一轮更新建设进行指导。     

施工企业安全生产责任制的建立和完善

本文通过探讨现阶段安全生产责任制建立过程中存在的问题,找出解决方法,提出改进建议,从而达到完善施工企业安全生产责任制的目的,并为施工企业安全生产提供了制度上的保证。     

古朴文化的新生命--宁夏高速公路管理中心建筑设计

如何利用建筑语言营造城市，保护、继承和发展城市的人文特质，建构城市文化？文章论了在“宁夏高速公路管理中心”这一建筑方案设计中，笔者对上述问题进行了一些尝试与探索。