The Experts below are selected from a list of 35337 Experts worldwide ranked by ideXlab platform

Ginu Rajan - One of the best experts on this subject based on the ideXlab platform.

Berend Denkena - One of the best experts on this subject based on the ideXlab platform.

  • 15th machining innovations conference for Aerospace Industry approach for increasing the resource efficiency for the production process of titanium structural components
    2015
    Co-Authors: Berend Denkena, Stefan Jacob
    Abstract:

    Titanium structural components for the aircraft Industry are usually manufactured from ingots of primary material. The process chain for the fabrication of these components consists of the production of titanium sponge, the melting process, the forging process and the milling process. High chip removal rates from up to 95% due to the milling process and a high energy demand in producing the titanium sponge of about 85% of the overall energy consumption characterize the process chain. This obviously leads to a high optimization potential under monetary and energetic a spects. Recycling titanium chips for the ingot production could help to dramatically improve the overall production process in terms of ecological aspects. However, process-induced contaminations of the chips prevent the use of high amounts of these in the melting procedure. Macroscopic im purities like residues of cooling lubricant can be removed in a complex cleaning process. Yet, contaminations like oxidization cannot be e liminated, hence only a small amount of titanium chips is usable in the melting process to achieve the required purity of the titanium alloy. This paper describes a novel method to decrease the energy consumption in fabricating titanium products. By reducing process-induced c ontaminations, the amount of titanium chips usable in the melting process can be significantly increased and consequently the necessary quantity o f titanium sponge reduced. The described method contains the investigation of relevant influencing factors like the impact of tool and cooling co ncept on chip quality or manufacturing costs. The research of cause-effect relationships identifies the trade-off between ecological and e conomic targets. A mathematical description of this relationship is implemented within a simulation environment to find an optimum between ecological and economic targets. The paper describes this approach with samples of the titanium alloy Ti6Al4V. © 2015 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Internati onal Scientific Committee of the “New Production Technologies in Aerospace Industry” conference.

  • evaluation of eddy current testing for quality assurance and process monitoring of automated fiber placement
    Composites Part B-engineering, 2014
    Co-Authors: Carsten Schmidt, Cedric Schultz, Patricc Weber, Berend Denkena
    Abstract:

    Abstract Standards in energy and cost efficiency are higher the ever especially in the Aerospace Industry. While structures made from carbon-fiber reinforced plastics (CFRP) show significant advantages in regards to specific strength and lightweight design, further improvements in their production processes are essential in order for CFRP to be competitive in the future. The authors present eddy current (EC) testing as a means for quality assurance (QA) and process monitoring for CFRP parts produced by automatic fiber placement (AFP), which is one the most prevalent production methods in Aerospace Industry. Eddy current testing shows the potential for highly automated process monitoring that can reduce error correction and cycle time in AFP.

Ebrahim Oromiehie - One of the best experts on this subject based on the ideXlab platform.

R D Briggs - One of the best experts on this subject based on the ideXlab platform.

  • the use of β titanium alloys in the Aerospace Industry
    Journal of Materials Engineering and Performance, 2005
    Co-Authors: R. R. Boyer, R D Briggs
    Abstract:

    Beta titanium alloys have been available since the 1950s (Ti-13V-11Cr-3Mo or B120VCA), but significant applications of these alloys, beyond the SR-71 Blackbird, have been slow in coming. The next significant usage of a β alloy did not occur until the mid-1980s on the B-1B bomber. This aircraft used Ti-15V-3Cr-3Al-3Sn sheet due to its capability for strip rolling, improved formability, and higher strength than Ti-6Al-4V. The next major usage was on a commercial aircraft, the Boeing 777, which made extensive use of Ti-10V-2Fe-3Al high-strength forgings. Ti-15V-3Cr-3Al-3Sn environmental control system ducting, castings, and springs were also used, along with Ti-3Al-8V-6Cr-4Mo-4Zr (β-C) springs. Beta-21S was also introduced for high-temperature usage. More recent work at Boeing has focused on the development of Ti-5Al-5Mo-5V-3Cr, a high-strength alloy that can be used at higher strength than Ti-10V-2Fe-3Al and is much more robust; it has a much wider, or friendlier, processing window. This, along with additional studies at Boeing, and from within the Aerospace Industry in general will be discussed in detail, summarizing applications and the rationale for the selection of this alloy system for Aerospace applications.

Essam Shehab - One of the best experts on this subject based on the ideXlab platform.

  • a framework for developing engineering design ontologies within the Aerospace Industry
    International Journal of Production Research, 2015
    Co-Authors: Isaac Sanya, Essam Shehab
    Abstract:

    This paper presents a framework for developing engineering design ontologies within the Aerospace Industry. The aim of this approach is to strengthen the modularity and reuse of engineering design ontologies to support knowledge management initiatives within the Aerospace Industry. Successful development and effective utilisation of engineering ontologies strongly depends on the method/framework used to develop them. Ensuring modularity in ontology design is essential for engineering design activities due to the complexity of knowledge that is required to be brought together to support the product design decision-making process. The proposed approach adopts best practices from previous ontology development methods, but focuses on encouraging modular architectural ontology design. The framework is comprised of three phases namely: (1) Ontology design and development; (2) Ontology validation and (3) Implementation of ontology structure. A qualitative research methodology is employed which is composed of fou...

  • an ontology framework for developing platform independent knowledge based engineering systems in the Aerospace Industry
    International Journal of Production Research, 2014
    Co-Authors: Isaac Sanya, Essam Shehab
    Abstract:

    This paper presents the development of a novel knowledge-based engineering (KBE) framework for implementing platform-independent knowledge-enabled product design systems within the Aerospace Industry. The aim of the KBE framework is to strengthen the structure, reuse and portability of knowledge consumed within KBE systems in view of supporting the cost-effective and long-term preservation of knowledge within such systems. The proposed KBE framework uses an ontology-based approach for semantic knowledge management and adopts a model-driven architecture style from the software engineering discipline. Its phases are mainly (1) Capture knowledge required for KBE system; (2) Ontology model construct of KBE system; (3) Platform-independent model (PIM) technology selection and implementation and (4) Integration of PIM KBE knowledge with computer-aided design system. A rigorous methodology is employed which is comprised of five qualitative phases namely, requirement analysis for the KBE framework, identifying so...