An experimental study on the deformation behaviour and fracture mode of recycled aluminium alloy AA6061-reinforced alumina oxide undergoing high-velocity impact

The anisotropic behaviour and the damage evolution of recycled aluminium alloy-reinforced alumina oxide are investigated in this paper using Taylor impact test. The test is performed at various impact velocity ranging from 190 to 360 m/s by firing a cylindrical projectile towards anvil target. The deformation behaviour and the fracture modes are analysed using the digitized footprint of the deformed specimens. The damage initiation and the progression are observed around the impact surface and the surface 0.5 cm from the impact area using the scanning electron microscope. The deformed specimens showed several ductile fracture modes of mushrooming, tensile splitting and petalling. The critical impact velocity is defined below 280 m/s. The specimens showed a strong strain-rate dependency due to the damage evolution that is driven by severe localized plastic-strain deformation. The scanning electron microscope analysis showed the damage mechanism progress via voids initiation, growth and coalescence in the material. The micrograph within the footprint surface shows the presence of alumina oxide particles within the specimen. The microstructure analysis shows a significant refinement of the specimen particle at the surface located 0.5 cm above the impact area. ImageJ software is adopted in this work to measure the average size of voids within this surface. Non-symmetrical (ellipse-shaped) footprint around the footprints showed plastic anisotropic behaviour. The results in this paper provide a better understanding of the deformation behaviour of recycled materials subjected to dynamic loading. This information on mechanical response is crucial before any potential application can be established to substitute the primary sources

Air Force Institute of Technology Research Report 2015

This report summarizes the research activities of the Air Force Institute of Technology’s Graduate School of Engineering and Management. It describes research interests and faculty expertise; lists student theses/dissertations; identifies research sponsors and contributions; and outlines the procedures for contacting the school. Included in the report are: faculty publications, conference presentations, consultations, and funded research projects. Research was conducted in the areas of Aeronautical and Astronautical Engineering, Electrical Engineering and Electro-Optics, Computer Engineering and Computer Science, Systems Engineering and Management, Operational Sciences, Mathematics, Statistics and Engineering Physics

Air Force Institute of Technology Research Report 2015

This report summarizes the research activities of the Air Force Institute of Technology’s Graduate School of Engineering and Management. It describes research interests and faculty expertise; lists student theses/dissertations; identifies research sponsors and contributions; and outlines the procedures for contacting the school. Included in the report are: faculty publications, conference presentations, consultations, and funded research projects. Research was conducted in the areas of Aeronautical and Astronautical Engineering, Electrical Engineering and Electro-Optics, Computer Engineering and Computer Science, Systems Engineering and Management, Operational Sciences, Mathematics, Statistics and Engineering Physics

Air Force Institute of Technology Research Report 2014

This report summarizes the research activities of the Air Force Institute of Technology’s Graduate School of Engineering and Management. It describes research interests and faculty expertise; lists student theses/dissertations; identifies research sponsors and contributions; and outlines the procedures for contacting the school. Included in the report are: faculty publications, conference presentations, consultations, and funded research projects. Research was conducted in the areas of Aeronautical and Astronautical Engineering, Electrical Engineering and Electro-Optics, Computer Engineering and Computer Science, Systems Engineering and Management, Operational Sciences, Mathematics, Statistics and Engineering Physics

Gas cooled fuel cell systems technology development

The first phase of a planned multiphase program to develop a Phosphoric is addressed. This report describes the efforts performed that culminated in the: (1) Establishment of the preliminary design requirements and system conceptual design for the nominally rated 375 kW PAFC module and is interfacing power plant systems; (2) Establishment of PAFC component and stack performance, endurance, and design parameter data needed for design verification for power plant application; (3) Improvement of the existing PAFC materials data base and establishment of materials specifications and process procedes for the cell components; and (4) Testing of 122 subscale cell atmospheric test for 110,000 cumulative test hours, 12 subscale cell pressurized tests for 15,000 cumulative test hours, and 12 pressurized stack test for 10,000 cumulative test hours

Surveyor 1 mission report. Part 1 - Mission description and performance

Surveyor 1 mission discription and performance for preflight and flight phase

Implementation of lockout/tagout (LOTO) methodologies on production lines

With machines getting increasingly more complex, as technology advances and automation becomes an increasingly important aspect of all types of manufacturing processes, so does the complexity of engaging with machinery increase, which can lead to increased risk, and injury rates. This is particularly relevant in the packaging industry, where competition and the market’s changing demands require that package manufacturers remain flexible and efficient, which makes maintenance, changes, and improvements to machinery a common occurrence. It is then important to promote safety in the workplace, by implementing safety standards and methodologies. One such methodology is known as LOTO, or Lockout Tagout, which aims to control hazardous energies by developing blocking methods for the energies present in industrial equipment and to develop safety procedures to instruct workers on how to perform their tasks safely. In this context, this dissertation aims to use LOTO methodologies to develop a safety procedure for three different machines, located in a factory specializing in the manufacturing of metal cans used for the packaging of various products. To achieve this goal, some preliminary work was done to develop the resources needed for the implementation of LOTO methodologies, such as the improvement of the tagging system that identifies the equipment and the energy blocking points, and the acquisition of the equipment needed to correctly block and dissipate the energy present in the machines. Following these tasks, each of the three machines was individually analyzed, documenting the tasks performed by workers on the machine and the energies involved in those tasks, as well as the implementation of the needed changes and improvements. Once the needed information was gathered, a safety procedure was developed and implemented for each machine, showcasing the documented tasks, along with the energies that need to be blocked, and a guide on how to perform each task safely. The implemented changes and safety procedure seemed not to slow down the duration of tasks and were able to reduce the injury rates seen on the machine. However, due to the time constraints placed on this dissertation, and the large timescale needed to correctly evaluate rates of injury, it is suggested to collect more data after implementation of the safety procedures for a more robust conclusion.Com o avanço da tecnologia, e com a automação a tornar-se num aspeto cade vez mais importante em todos os tipos de indústrias, todos os dias as máquinas tornam-se também cada vez mais complexas, o que leva a um aumento na dificuldade e complexidade inerente em interagir com estes sistemas mecânicos, o que pode levar a um aumento nos riscos e no número de lesões. Este facto é particularmente relevante na indústria de embalagens, onde a competição e as mudanças nos requisitos do mercado exigem que os fabricantes permaneçam flexíveis e eficientes, o que torna a manutenção, alterações e melhorias em máquinas uma ocorrência comum. É então importante promover a segurança no local de trabalho, através da implementação de normas e metodologias de segurança. Uma destas metodologias de segurança é conhecida pelo nome de LOTO, ou Lockout Tagout. Esta metodologia visa controlar as energias perigosas, implementar métodos de bloqueio das energias presentes nos equipamentos industriais, e desenvolver procedimentos de segurança para instruir os trabalhadores sobre como realizar as suas tarefas com segurança. Esta dissertação tem como objetivo utilizar as metodologias LOTO para desenvolver um procedimento de segurança para três máquinas diferentes, localizadas numa fábrica que se especializa no fabrico de latas metálicas utilizadas em diversos produtos. Para tal, foram realizados alguns trabalhos preliminares de forma a desenvolver os recursos necessários para a implementação de metodologias LOTO, tais como a melhoria do sistema de etiquetagem que identifica os equipamentos e os pontos de bloqueio de energia, e a aquisição dos equipamentos necessários para corretamente bloquear e dissipar as energias presentes nas máquinas. Em seguida, cada uma das três máquinas foi analisada individualmente, documentando quais tarefas são executadas pelos trabalhadores na máquina, e quais as energias envolvidas em cada tarefa, bem como implementadas as mudanças e melhorias necessárias. Uma vez reunidas as informações necessárias, foi desenvolvido e implementado um procedimento de segurança para cada máquina, apresentando as tarefas documentadas, juntamente com as energias que precisam de ser bloqueadas, e um guia sobre como realizar cada tarefa com segurança. As mudanças implementadas e o procedimento de segurança pareceram não aumentar a duração da realização das tarefas, e conseguiram reduzir as taxas de lesões observadas nas máquinas. No entanto, devido às limitações do tempo impostas nesta dissertação, e à grande escala de tempo necessária para avaliar corretamente as taxas de lesões, sugere-se recolher mais dados após a implementação dos procedimentos de segurança para obtenção de conclusões mais robustas

Smart Technologies for Precision Assembly

This open access book constitutes the refereed post-conference proceedings of the 9th IFIP WG 5.5 International Precision Assembly Seminar, IPAS 2020, held virtually in December 2020. The 16 revised full papers and 10 revised short papers presented together with 1 keynote paper were carefully reviewed and selected from numerous submissions. The papers address topics such as assembly design and planning; assembly operations; assembly cells and systems; human centred assembly; and assistance methods in assembly

NASA Tech Briefs, July 1992

Topics include: New Product Ideas; Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Computer Programs; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences; Life Sciences

Saturn S-2 problem resolution history report

A summary of S-2 Program problems and the solutions that were implemented is presented. The problems occurred during a period starting with the initial design concepts and continuing through the launch of the tenth S-2 flight stage information is from nine separate disciplines: design, facilities, logistics, manufacturing, material, program management, quality assurance, safety, and tests