1,721,212 research outputs found
Challenges and opportunities in the additive layer manufacturing of Al-Al2O3 nanocomposites
No full textAn ontology based approach to measuring the semantic similarity between information objects in personal information collections
No full textThis paper introduces a semantic approach to personal information management, which employs natural language processing, ontologies and a vector space model to measure the semantic similarity between information objects in personal information collections. The approach involves natural language processing, named entity recognition, and information object integration. In particular, natural language processing is used to detect meaningful and semantically distinguishable information objects within collections of personal information. Then, the named entities are extracted from these information objects and their features (such as weight and category) are used to measure the semantic similarity between them. Further research includes using the semantic similarity measure developed to index and retrieve information objects in a semantic based system for personal information management
Product change management: assessing the challenges to maintaining design integrity throughout the product lifecycle
No full textProduct change management and future information architectures
No full textImplementing and managing the consequences of design change in the context of complex products is challenging. Design changes generate significant volumes of information and product management is becoming increasingly information intensive. It is now critically important that information and communication technology solutions are engineered to support through life product design management processes and the management models used to guide decision making. The purpose of this paper is to describe the prominent challenges of providing through life product management and the nature of information architectures needed to enable efficiency improvements. Actions that need to be taken to make progress are proposed
An Investigation into the quasi-static response of Ti6Al4V lattice structures manufactured using selective laser melting
No full textTi6Al4 V (Ti64) lattice structures manufactured using selective laser melting (SLM) have been used in fields such as aerospace and medical science due to their exceptional light weight, corrosion-resistant capability and biocompatibility. In this study, the mechanical properties of octahedral-type Ti64 lattice structures under quasi-static loading conditions was investigated. The initial stiffness, ultimate strength and ductility of the structures with different aspect ratios were evaluated and compared using experiments and quasi-static finite element analysis (FEA). The results demonstrated that the experimental data and FEA were in good agreement. The initial stiffness and strength of the octahedral lattice structures improved significantly as the strut aspect ratios decreased; however, the poor ductility evident in all the samples showed no obvious relationship to the aspect ratios, which means that the geometrical sizes had little effect on the brittle behaviour of the Ti64 lattice structures fabricated using SLM
Engineering a more sustainable manufacturing process for metal Additive Layer Manufacturing using a productive process pyramid
No full textSustainability within manufacturing is an increasingly important topic globally. One course of action being explored is to produce more parts ‘right first time’ so supporting an increasingly sustainable manufacturing process. This paper explores the Renishaw “productive process pyramid” and considers how it can be integrated into the ALM process. The pyramid is currently used to identify how layers of control can systematically remove variation from conventional machining processes. This application is focussed to consider how the variables that occur within the ALM manufacturing process can impact on the quality of the parts mechanically and geometrically. This approach can then inform the process foundation and process setting stages and enhance levels of in-process control
Additive manufacturing of high-strength crack-free Ni-based Hastelloy X superalloy
Full text linkLaser powder bed fusion (LPBF) is a proven additive manufacturing (AM) technology for producing metallic components with complex shapes using layer-by-layer manufacture principle. However, the fabrication of crack-free high-performance Ni-based superalloys such as Hastelloy X (HX) using LPBF technology remains a challenge because of these materials’ susceptibility to hot cracking. This paper addresses the above problem by proposing a novel method of introducing 1 wt.% titanium carbide (TiC) nanoparticles. The findings reveal that the addition of TiC nanoparticles results in the elimination of microcracks in the LPBF-fabricated enhanced HX samples; i.e. the 0.65% microcracks that were formed in the as-fabricated original HX were eliminated in the as-fabricated enhanced HX, despite the 0.14% residual pores formed. It also contributes to a 21.8% increase in low-angle grain boundaries (LAGBs) and a 98 MPa increase in yield strength. The study revealed that segregated carbides were unable to trigger hot cracking without sufficient thermal residual stresses; the significantly increased subgrains and low-angle grain boundaries played a key role in the hot cracking elimination. These findings offer a new perspective on the elimination of hot cracking of nickel-based superalloys and other industrially relevant crack-susceptible alloys. The findings also have significant implications for the design of new alloys, particularly for high-temperature industrial applications
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