Thematische Bibliographien / Tool-life testing

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Auswahl der wissenschaftlichen Literatur zum Thema „Tool-life testing“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 18. Februar 2022

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Zeitschriftenartikel zum Thema "Tool-life testing"

Janásek, Adam, Robert Čep, Lenka Čepová, Jiří Kratochvíl, Vladimír Vrba und Lenka Petřkovská. „Tool Life Reliability of Indexable Cutting Inserts“. Technological Engineering 9, Nr. 2 (01.12.2012): 30–34. http://dx.doi.org/10.2478/teen-2012-0008.

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Abstract This paper presents experimental testing of the cutting ability for indexable cutting inserts. The main goal will be to select a suitable test for determine the cutting abilities of cutting inserts. Nowadays all manufacturers want to achieve lower cutting forces so can permit higher speeds and feeds, without increasing the risk of chipping. For evaluating we had to design such testing procedure that it would be possible to compare and evaluate the cutting ability of the selected cutting inserts used for tests. In today’s competitive global market, quality and precision is the most important parameter. Tight tolerances and urgent deadlines are normal. In the machine tool business, companies must keep their cutting edge, or your company will lose its competitive edge.

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Karandikar, Jaydeep M., Tony L. Schmitz und Ali E. Abbas. „Spindle speed selection for tool life testing using Bayesian inference“. Journal of Manufacturing Systems 31, Nr. 4 (Oktober 2012): 403–11. http://dx.doi.org/10.1016/j.jmsy.2012.07.013.

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Fohn, Sara Lorene, Carol Mulvenon und Susan F. McElroy. „Development and Testing of the End-of-Life Transfer Tool“. Journal of Hospice & Palliative Nursing 19, Nr. 4 (August 2017): 363–67. http://dx.doi.org/10.1097/njh.0000000000000357.

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Alauddin, M., M. A. El Baradie und M. S. J. Hashmi. „Tool-life testing in the end milling of Inconel 718“. Journal of Materials Processing Technology 55, Nr. 3-4 (Dezember 1995): 321–30. http://dx.doi.org/10.1016/0924-0136(95)02035-7.

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Schwarzwalder, Alison, Zephania Chilangwa, Ilesh Patel, Andrew Burke und Matthew Lynch. „Testing a Tool to Scale Quality of Life Indicators in Tanzania“. Field Methods 20, Nr. 2 (10.03.2008): 179–90. http://dx.doi.org/10.1177/1525822x07313812.

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Tokarev, Denis Ivanovich, Andrey Alexandrovich Drozdov, Lyudmila Dmitrievna Sirotenko, Elena Vyacheslavovna Matygullina und Timur Rizovich Ablyaz. „Comparative testing tool life in turning of composite plastic F-4К20“. Metalloobrabotka, Nr. 2 (2019): 14–18. http://dx.doi.org/10.25960/mo.2019.2.14.

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Menyhart, Otília, Boglárka Weltz und Balázs Győrffy. „MultipleTesting.com: A tool for life science researchers for multiple hypothesis testing correction“. PLOS ONE 16, Nr. 6 (09.06.2021): e0245824. http://dx.doi.org/10.1371/journal.pone.0245824.

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Scientists from nearly all disciplines face the problem of simultaneously evaluating many hypotheses. Conducting multiple comparisons increases the likelihood that a non-negligible proportion of associations will be false positives, clouding real discoveries. Drawing valid conclusions require taking into account the number of performed statistical tests and adjusting the statistical confidence measures. Several strategies exist to overcome the problem of multiple hypothesis testing. We aim to summarize critical statistical concepts and widely used correction approaches while also draw attention to frequently misinterpreted notions of statistical inference. We provide a step-by-step description of each multiple-testing correction method with clear examples and present an easy-to-follow guide for selecting the most suitable correction technique. To facilitate multiple-testing corrections, we developed a fully automated solution not requiring programming skills or the use of a command line. Our registration free online tool is available at www.multipletesting.com and compiles the five most frequently used adjustment tools, including the Bonferroni, the Holm (step-down), the Hochberg (step-up) corrections, allows to calculate False Discovery Rates (FDR) and q-values. The current summary provides a much needed practical synthesis of basic statistical concepts regarding multiple hypothesis testing in a comprehensible language with well-illustrated examples. The web tool will fill the gap for life science researchers by providing a user-friendly substitute for command-line alternatives.

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Han, Zhen Yu, Guang Нu Liu und Hong Нa Fu. „A Review of Residual Life Prediction for Remanufacturing of Machine Tool“. Applied Mechanics and Materials 552 (Juni 2014): 133–38. http://dx.doi.org/10.4028/www.scientific.net/amm.552.133.

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A growing concern about the environment problems, especially about the waste, carbon emissions and landfill, has spurred research into the field of remanufacturing. This paper mainly focuses on the residual life prediction in the remanufacturing of machine tools, which is an important step of remanufacturing process. A system analysis and synthesis is performed in the fields of testing data collection and data analysis and calculation, which are the two important components of residual life prediction. Some non-destructive testing technologies for data collection and some algorithms for data analysis are summarized and made comparison. In addition, this paper also aims at giving a perspective in such area in the future.

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El Baradie, M. A. „The effect of varying the workpiece diameter on the cutting tool clearance angle in tool-life testing“. Wear 195, Nr. 1-2 (Juli 1996): 201–5. http://dx.doi.org/10.1016/0043-1648(95)06858-9.

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Klocke, Fritz, Christof Gorgels, Arne Stuckenberg und Emmanouil Bouzakis. „Qualification of Coatings to Predict Wear Behavior of Micro Blasted Cutting Tools“. Key Engineering Materials 438 (Mai 2010): 23–29. http://dx.doi.org/10.4028/www.scientific.net/kem.438.23.

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In today’s production engineering nearly every cutting tool is coated. In the field of coating technology and tool treatment blasting is a common way to increase tool life or hold it on a constant level for several reconditioning steps. The latest innovation referring blasting are micro blasted coatings. For this technology a parameter variation was examined and the consequential tool life was compared with common testing method for tool systems in order to qualify the coating treatment. The investigations were carried out using an aluminum and zirconium oxide as blasting abrasive and by varying the blasting parameters pressure and duration. Finally, the treatment led to an optimized tool wear behavior due to micro blasting of the coating and the wear behavior could be referenced against the testing methods.

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Dissertationen zum Thema "Tool-life testing"

Niu, Caotan, und 牛草坛. „A study of tool life and machinability parameters in high speed milling of hardened die steels“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39557170.

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Kazymyrovych, Vitaliy. „Very high cycle fatigue of high performance steels“. Licentiate thesis, Karlstad University, Faculty of Technology and Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-3066.

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Many engineering components reach a finite fatigue life well above 10⁹load cycles. Some examples of such components are found in airplanes, automobiles or high speed trains. For some materials the fatigue failures have lately been found to occur well after 10⁷ load cycles, namely in the Very High Cycle Fatigue (VHCF) range. This finding contradicted the established concept of fatigue limit for these materials, which postulates that having sustained 10⁷ load cycles the material is capable of enduring an infinite number of cycles provided that the service conditions are unchanged. With the development of modern ultrasonic fatigue testing equipment it became possible to experimentally establish VHCF behaviour of various materials. For most of them the existence of the fatigue limit at 10⁷ load cycles has been proved wrong and their fatigue strength continues to decrease with increasing number of load cycles.

One important group of materials used for the production of high performance components subjected to the VHCF is tool steels. This study explores the VHCF phenomenon using experimental data of ultrasonic fatigue testing of some tool steel grades. The causes and mechanisms of VHCF failures are investigated by means of high resolution scanning electron microscopy, and in relation to the existing theories of fatigue crack initiation and growth. The main type of VHCF origins in steels are slag inclusions.

However, other microstructural defects may also initiate fatigue failure. A particular attention is paid to the fatigue crack initiation, as it has been shown that in the VHCF range crack formation consumes the majority of the total fatigue life. Understanding the driving forces for the fatigue crack initiation is a key to improve properties of components used for very long service lives. Finite element modelling of VHCF testing was added as an additional perspective to the study by enabling calculation of local stresses at the fatigue initiating defects.

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Prno, Peter. „Obrábění kobaltové slitiny UmCo50“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444280.

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The diploma thesis deals with the topic of machinability of materials. The theoretical part describes the aspects according to which machinability can be evaluated. The material side of the thesis is focused on various types of difficult-to-machine materials. The cobalt alloy UmCo50 belongs to the group of difficult-to-machine materials and it is the subject of the experimental part. UmCo50 is an alloy for high temperature use. The primary aim of the thesis was to monitor the wear of the selected cutting tool when turning this alloy. Other aspects of the selected machining process were also monitored, such as force effects or the quality of the machined surface. Despite the fact that machinability of tested materials cannot be expressed in terms of the absolute value of a quantity, it is necessary to compare the various aspects of the machining processes by reference materials. However, certain conditions of this comparison must be met. Based on this, a comparison of tested and reference material was performed.

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Karlsson, Daniel. „Life and fracture in very high cycle fatigue of a high strength steel“. Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-86135.

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Classical fatigue models teach that there is an intrinsic fatigue limit for steels, representing a level of stress that is too low for regular crack growth where every cyclic load propagates a fatigue crack through the material. Modern application with extreme lifetimes has shown that fatigue will still take place in steels with stress levels well below the expected fatigue limit. This relatively new area of study has been named Very High Cycle Fatigue, or VHCF, and describes fatigue failures with a number of load cycles exceeding 107. Fractography of steels that has suffered VHCF tends to reveal an especially rough crack surface adjacent to where the fatigue crack originates, which is typically some form of defect in the bulk of the steel. This area is believed to be critical for VHCF and has been referred to in a number of ways by different studies, but will herein be called Fine Granular Area, or FGA. The aim of this study is to try and get a better understanding of VHCF. This was done by fractography analysis of test specimens of high strength tool steel that suffered fatigue failure at lifetimes ranging from about 106 cycles to 1,9x109 cycles. The lower lifetimes were achieved using hydraulic testing equipment, while the specimens in the VHCF range suffered fatigue failure in ultrasonic testing equipment allowing the application of a cyclic stress at a rate of 20 000 Hz. The resulting fracture surfaces were then investigated using a scanning electron microscope, or SEM, taking special note of the fatigue initiating defects and, in the case of VHCF, the rough area found adjacent to it. In combination with the SEM an elemental analysis of the fatigue initiating defects as well as the bulk of the material was done using energy-dispersive X-ray spectroscopy, or EDS. This was done to find out what the defects consisted of; confirming that they were slags and checking that the composition of the material of the bulk of the specimen matches what was expected. Using light optical microscopy in combination with acid etching of the surface of samples cut out of the test specimens the structure of the steel was investigated. Calculating the local stresses at the location of the fatigue initiating defect was done using FEM in combination with displacement amplitude gathered from the ultrasonic testing equipment. The data gathered was then measured and compared to that of previous studies, using models of prediction and seeing how they match the experimental results. The results suggest that the stress intensity factor at the internal slags is critical for VHCF and that with lower stress intensity factors one can expect longer lifetimes. Another observation is a relatively consistent stress intensity factor at the edge of the FGA combined with the original defect, likely signifying the transition from the creation of FGA to traditional crack propagation. There also seems to be a connection between the size of the FGA and the number of cycles to failure, with larger FGA with increasing lifetimes. The most glaring shortcoming of this study is the amount satisfactory tests conducted, and thus amount of data points, is very low due to the majority of specimens suffered failure at the threading used to connect them to the ultrasonic testing equipment at lifetimes far too low to be relevant.
Klassiska utmattningsmodeller lär ut att det finns en utmattningsgräns för stål, vilket representerar en spänningsnivå som är för låg för regelbunden sprickväxt där varje cyklisk belastning sprider en utmattningsspricka genom materialet. Moderna applikation med extrema livstider har visat att utmattning fortfarande äger rum i stål med spänningsnivåer långt under den förväntade utmattningsgränsen. Detta relativt nya studieområde har fått namnet Very High Cycle Fatigue, eller VHCF, och beskriver utmattningsfall med ett antal belastningscykler som överstiger 107. Fraktografi av stål som har drabbats av VHCF tenderar att ha en särskilt gropig sprickyta som ligger intill där utmattningssprickan har sitt ursprung, vilket typiskt är någon form av defekt i stålets bulk. Detta område tros vara kritiskt för VHCF och har hänvisats till på ett antal sätt av olika studier, men kommer här att kallas Fine Granular Area eller FGA. Syftet med denna studie är att försöka få en bättre förståelse för VHCF. Detta gjordes genom fraktografianalys av testprover av verktygsstål med hög hållfasthet som drabbades av utmattningsbrott vid livstider från cirka 106 cykler till 1,9x109 cykler. De lägre livslängderna uppnåddes med hjälp av hydraulisk testutrustning, medan proverna i VHCF-området drabbades av utmattningsbrott i ultraljudstestutrustning som klarar att applicera en cyklisk stress med en frekvens på 20 kHz. De resulterande sprickytorna undersöktes sedan med hjälp av ett svepelektronmikroskop, eller SEM, med särskild fokus på utmattningsinitierande defekter och, i fallet med VHCF, det grova området som hittades intill det, FGA. I kombination med SEM utfördes en elementanalys av utmattningsinitierande defekter liksom huvuddelen av materialet med energidispersiv röntgenspektroskopi, eller EDS. Detta gjordes för att ta reda på vad inneslutningarna bestod av för att bekräfta att de var slagg samt kontrollera att sammansättningen av materialet i huvuddelen av provet matchar det som förväntades. Med användning av optisk ljusmikroskopi i kombination med syraetsning av ytan på prover som skars ut ur testproverna undersöktes stålets struktur. Beräkning av de lokala spänningarna på platsen för den utmattningsinitierande defekten gjordes med hjälp av FEM i kombination med förskjutningsamplituden som samlats från ultraljudsutrustningen. De insamlade uppgifterna mättes sedan och jämfördes med tidigare studier genom att använda diverse modeller och se hur de matchar de experimentella resultaten. Resultaten antyder att stressintensitetsfaktorn vid inneslutningarna är kritisk för VHCF och att man med lägre stressintensitetsfaktorer kan förvänta sig längre livstid. En annan observation är en relativt konsekvent stressintensitetsfaktor vid kanten av FGA, vilket sannolikt markerar övergången från skapandet eller utbredning av FGA till traditionell sprickutbredning. Det verkar också finnas en koppling mellan storleken på FGA och antalet cykler till fel, med större FGA med ökande livslängd. Den mest uppenbara bristen i denna studie är mängden tillfredsställande tester som genomförts. Därmed är mängden datapunkter mycket låg, detta på grund av att majoriteten av proverna misslyckades vid gängningen som användes för att ansluta dem till ultraljudstestutrustningen vid livstider alltför låga för att vara relevanta.

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Bücher zum Thema "Tool-life testing"

Grabe, Magnus, und Björn Wullt. Urinary tract infection. Herausgegeben von Rob Pickard. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199659579.003.0004.

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Infections of the urinary tract are among the most frequent infections encountered in the community and hospital environments. They range from harmless self-curing cystitis to severe pyelonephritis with life-threatening sepsis. Urinary tract infections are often recurrent. Host defence is crucial to control the infection but can also be deleterious in terms of scar formation. Early diagnosis, determination of severity, evaluation of possible risk factors, and assumption of possible pathogen are essential aspects to initiate efficient treatment. Urine culture with antibiotic sensitivity testing is the most important tool to confirm a suspected clinical diagnosis and direct treatment. Patients with urological disease are particularly susceptible to urinary tract infections, and healthcare-associated urinary infections are observed in approximately 10% of hospitalized urological patients. In view of the worsening resistance pattern of common urinary pathogens against available antimicrobial agents, it is important to comply with recommended treatment regimens.

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Buchteile zum Thema "Tool-life testing"

Commare, U. La, und G. Passannanti. „Relevance of Tool Life Testing for Tool Replacement Strategies“. In Proceedings of the Twenty-Sixth International Machine Tool Design and Research Conference, 367–72. London: Macmillan Education UK, 1986. http://dx.doi.org/10.1007/978-1-349-08114-1_48.

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Fernandez, Luis, Pedro J. Lara und Juan José Cuadrado. „Efficient Software Quality Assurance Approaches Oriented to UML Models in Real Life“. In Verification, Validation and Testing in Software Engineering, 385–426. IGI Global, 2007. http://dx.doi.org/10.4018/978-1-59140-851-2.ch013.

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UML is accepted as the standard notation for object-oriented (OO) development. UML models have a widespread use in today’s software practices. Any initiative to improve software quality assurance (SQA) should assume that a high percentage of deliverables to be controlled are currently based on the use of UML notation. However, real life projects are strongly influenced by the need of reaching tangible productivity and efficiency goals. SQA techniques should be customized to meet the balance between quality and budget supported by risk analysis. In this chapter, different strategies and techniques devised to follow the above philosophy of efficiency are presented, especially centred in automatic testing generation from specifications. Our proposal is mainly based on a recommended course of action as well as on integrated tool support for Eclipse environments.

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Burstein, Leonid. „Simulation Tool for Cable Design“. In Handbook of Research on Advancements in Manufacturing, Materials, and Mechanical Engineering, 54–74. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4939-1.ch003.

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This chapter is an updated, enhanced, and expanded paper previously published in IJMMME. An attenuation-based mathematical model and computational tool for communication cable design is presented in the chapter. The relationship derived for the model creation connects attenuation with the following parameters of cable design and testing: copper wire, aluminum and insulation thicknesses, cable impedance, test frequency, and lay length. The expression found from numerous measurement data was used to simulate the Monte Carlo prediction of attenuation in the cable. To realize the simulations, a life script and regular MATLAB script programs were developed. The programs produce a special graphical user interface suitable for non-programmers, cable engineers, and technicians. Results of calculations obtained with the developed tool were verified by experiments and indicate that the tool can be used to design cables with optimal parameters.

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Sewagegn, Abatihun Alehegn, und Boitumelo Molebogeng Diale. „Authentic Assessment as a Tool to Enhance Student Learning in a Higher Education Institution“. In Assessment, Testing, and Measurement Strategies in Global Higher Education, 256–71. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2314-8.ch013.

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Authentic assessment plays a great role in enhancing students' learning and makes them competent in their study area. Studies indicate that assessment is authentic when the tasks have real-life value and students perform real-world tasks. Therefore, this chapter shows how lecturers practice authentic assessment to enhance students' learning in a higher education institution. To achieve this, the authors used a phenomenological qualitative research design. An interview was used to collect data. The result indicated that lecturers are highly dependent upon traditional assessment methods, which have no significant contribution to the competency of students. The practice of authentic assessment methods as a tool to enhance students' learning is limited. Therefore, the authors can conclude that enhancing students' learning using authentic assessment in their study areas is untenable if the lecturers continue to utilize their current assessment practices.

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Ross, William, und Ross Slovensky. „Using the Internet to Attract and Evaluate Job Candidates“. In Encyclopedia of Cyber Behavior, 537–49. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0315-8.ch046.

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The development of the Internet affords new opportunities for organizations as they add talent to their workforce. Employers are using third-party job placement websites (e.g., Monster.com), virtual job fairs, social networking websites, and even massively multiplayer online games such as Second Life to recruit job candidates. Organizations are also using their own websites to both attract and to evaluate new applicants. Accompanying these trends is the use of Internet-based testing for evaluating job candidates. Such testing varies based on whether it is proctored or unproctored and whether it incorporates dynamic computer adaptive testing. Finally, many firms are using individual candidate’s social networking websites (e.g., Facebook) as a background screening tool for evaluating job candidates. These trends are described and research questions identified.

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Eguchi, Amy. „Educational Robotics as a Learning Tool for Promoting Rich Environments for Active Learning (REALs)“. In Handbook of Research on Educational Technology Integration and Active Learning, 19–47. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8363-1.ch002.

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In our ever-changing society where new technological tools are being introduced into daily life more rapidly than ever before, more and more innovative and creative people are needed for the work of advancing technology. However, current educational practice in schools seems to be moving away from helping to educate our future innovative and creative workforce. With the extensive focus on assessments through standardized testing, the concern is raised that more and more teachers are forced to teach to the test. In this chapter, educational robotics is introduced as a transformational tool for learning, which promotes learning of computational thinking, coding, and engineering, all increasingly being viewed as critical ingredients of STEM learning in K-12 education. The purpose of this chapter is to highlight the importance of integrating educational robotics as a technological learning tool into K-12 curriculum to promote Rich Environments for Active Learning (REALs) to prepare students for the technology-driven future.

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Hai-Jew, Shalin. „Connecting Related Online Elements with Maltego Carbon 3.5.3™“. In Developing Successful Strategies for Global Policies and Cyber Transparency in E-Learning, 168–89. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-8844-5.ch011.

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With so much of modern life conducted in online spaces, understanding what is knowable through those spaces is a critical aspect of digital literacy and informational awareness. To increase online transparency, Maltego Carbon 3.5.3 (a penetration testing tool) enables powerful exploration of the Surface Web through its “machines” and “transforms.” Maltego enables the exploration of the interconnections between disparate pieces of online information (including technological understructures, documents, aliases, images, phrases, email addresses, telephone numbers, social media accounts, and geographical location coordinates. In the educational context, this tool may be applied in a number of ways. This chapter summarizes six generic “use cases”: Use Case 1: Understanding an Online / Offline Entity; Use Case 2: Exploring a Domain; Use Case 3: From Physical Location to Cyber and Back Again; Use Case 4: Online Conversations on Social Media Sites; Use Case 5: Eventgraphing: Mapping an Event Online, and Use Case 6: Finding Leads to Enhance Research.

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Behera, Rajat Kumar, Abhaya Kumar Sahoo und Ajay Jena. „A Resourceful Approach in Security Testing to Protect Electronic Payment System Against Unforeseen Attack“. In Research Anthology on Artificial Intelligence Applications in Security, 1279–302. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-7705-9.ch057.

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This article describes how electronic payments are financial transactions made over the internet for goods or services. In the digital era, the e-commerce industry has gone beyond the traditional in-store service due to the wide spread of internet-based shopping. Developed countries are greatly relying on e-commerce business and a sizable number of countries have shown concern in regard to the online payment cards such as credit cards, debit cards, e-cash, e-cheques, e-wallets and smart card security. The main downsides are concerns over privacy or a malicious attack and hence safeguard mechanisms are required to protect personal information from falling into the hands of intruders. Before commercializing electronic payment systems (EPS), security tests play a significant role in the software development life cycle to check whether the system is secure and it is safe to use. A resourceful approach covering security policies, secure coding, security attack prevention methodology, security testing tool, security testing metrics, security test case prioritization techniques and a model for effective project management methodology are presented in this article. Early detection and resolution of security weaknesses can be achieved with the authors' proposed approach and would certainly reduce the time, effort and cost of a project. The proposed approach is likely the best-fit implementation of the payment industry, covering channels like B2C (Business to Consumer), C2C (Consumer to Consumer), C2B (Consumer to Business), B2B (Business to Business), People to People (P2P), G2C (Government to Citizen) and C2G (Citizen to Government).

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Corigliano, Stephanie. „Theologizing for the Yoga Community?“ In How to Do Comparative Theology. Fordham University Press, 2017. http://dx.doi.org/10.5422/fordham/9780823278404.003.0016.

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Stephanie Corigliano addresses the issues of religious belonging and commitment by comparing and contrasting “rooted” and “aerial” modes of comparative theology. Corigliano first examines the “rooted” comparative theological methods of four founding scholar-practitioners and then attends to the differently configured experiences and theological potentials of a younger generation that is “aerial,” more agile, and fluid in its instincts. Even if initially religious commitment or “rootedness” sensibly formed a natural criterion for comparative theology, nevertheless, as the scope of the field expands, this criterion must cede some space to the fact of less rooted, more fluid realities in one’s own community and life, and in those of our religious others. Testing comparative theology in the classroom and using it as a tool for examining new religious and spiritual movements suggests that it can no longer be limited to exchanges between persons from established religious traditions.

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Konferenzberichte zum Thema "Tool-life testing"

Bakhtyar, Fahad, und S. Kenny. „Development of a Fatigue Life Assessment Tool for Pipelines With Local Wrinkling Through Physical Testing and Numerical Modelling“. In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24082.

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Pipelines are one of the primary modes to transport hydrocarbon products throughout the world. A majority of these pipeline systems are buried, which are susceptible to ground movement that imposes axial forces and bending moments on the pipeline section. As a result of these forces and moments pipeline section may experience localized deformation that result in wrinkling, buckling and other damage mechanisms. This may impair the pipeline mechanical performance with respect to local stress concentration, lower strength and reduced fatigue life. Cyclic operational loads or ground movement events may result in strain reversals within the pipeline section that may lead to fracture through low cycle fatigue process. In this study, physical testing was conducted to examine the strength and fatigue life performance characteristics of hot rolled steel (44-W). The effects of the test sample bend radius, wall thickness and imposed displacement stroke range on fatigue performance were examined. The data was used to develop and refine continuum finite element modeling procedures that can be used to assess the influence of pipeline damage on fatigue life in a more detailed numerical simulation framework.

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Chatterley, James J., Andrew J. Boone, Thomas L. Lago¨, Jonathan Blotter, Scott D. Sommerfeldt und Craig C. Smith. „Sound Quality Testing and Analysis of Multiple Brands of Sewing Machines“. In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-85636.

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Sound quality analysis is an invaluable tool for the product designer. This tool is designed to help determine customer preferences, which can help the designer improve product quality, or the consumers’ perception of the product’s quality. Many industries desire to know how the consuming public perceives their product as this affects the product life and viability. This paper will present which of two brands of sewing machines ranging in market segments from entry-level, thru mid-level machines, to high-end computer controlled units, is the most acoustically pleasant. Results across market segments independent of brand will be evaluated and compared, as well. The methods used to determine the sound quality of these machines will be presented. These methods are both jury based listening tests and quantitative sound quality metrics.

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Wang, Yinyan, Chuntao Zhang, Xiaohua Wu, Guoshu Song und Zhengfang Qian. „Integrated Reliability Solutions: A Software Tool for Mechanical Reliability of Electronic Components“. In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15542.

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A software tool, "Integrated Reliability Solutions" (IRS) has been developed, based upon the methodologies that have been applied to solving mechanical reliability problems of electronic components. The tool provides a system approach to reliability modeling. This tool enables significant reductions in design cycle time, warranty costs, and time required for experimentation and accelerated life testing. It also enables robust design and optimized manufacturing processes, and the timely and accurate innovation, evaluation and validation of new technologies.

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Cinar, Ali, und Kader Senocak. „Fatigue Life Improvement of Antiroll Bar Bracket Used in Heavy Truck Suspension“. In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24202.

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Finite element analysis has been used widely in automotive industry to evaluate design alternatives. Especially when there is no prototype part for rig testing; CAE (Computer Aided Engineering) is the only tool to evaluate design whether it meets customer usage profile for the vehicles entire life. Antiroll bar bracket is used in heavy truck suspension which is mounted on the top of front axle & beneath the leaf spring squeezed with U bolts. Bracket has two attachment points for external loadings; antiroll bar & shock absorber. Modeling techniques used in finite element for stress analysis include assembly loads in addition to the external loads. Material & contact nonlinearities have been used for stress estimation. Alternative design is used to decrease stress level; and therefore increase fatigue life of the bracket. Rig testing has been used to determine fatigue life of bracket. Results for finite element & rig testing have been presented.

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Daleo, Joseph A., Keith A. Ellison und David A. Woodford. „Application of Stress Relaxation Testing in Metallurgical Life Assessment Evaluations of GTD111 Alloy Turbine Buckets“. In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-370.

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Stress relaxation and constant displacement rate tensile tests were performed on poly-crystalline GTD111 alloy material removed from General Electric MS6001B first stage combustion turbine buckets. Samples were examined in the standard heat treated condition, thermally exposed at 900°C for 5000 hours and from service run buckets. Creep rates of the material were measured and evaluated directly in terms of temperature capability at 850°C and 900°C. Stress relaxation tests done at 0.8% total strain indicated that the creep rate properties in the service exposed airfoil were an order of magnitude higher than the material properties in the standard heat treated condition measured in the root form. In terms of temperature capability, the creep rate properties of the service run airfoil material had decreased by the equivalent of almost 40°C. The stress relaxation test method was demonstrated to be a very useful tool in quantifying the degradation of creep properties in service run components. Creep data that would require years to gather using conventional creep tests was generated in a few days. This now makes realistic life assessment and repair / replace decisions possible during turbine overhauls. The test method’s unique ability to measure changes in creep rate over a large stress range, enabled the technique to distinguish between changes in creep strength due to (normal) microstructural evolution from the combined effects of microstructural evolution and strain related creep damage. A method for estimating standard constant load creep rupture life from the stress relaxation creep rate data is also presented along with time-temperature parameter correlations. The data sets examined in this study indicate that creep rupture lives can be estimated within a factor of three from the stress relaxation data. The information and analysis techniques described in this paper are directly applicable to metallurgical life assessment evaluations and the re-qualification of repaired General Electric buckets in Frame 3, 5, 6, 7 and 9 engine models.

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Lingwall, B. A., C. H. Cooley und T. N. Sexton. „Polycrystalline Diamond Thrust Bearing Testing and Qualification for Application in Marine Hydrokinetic Machines“. In ASME/STLE 2012 International Joint Tribology Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ijtc2012-61061.

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Polycrystalline diamond (PCD) bearings are designed for use in extreme environments; this includes process-fluid-lubricated applications such as those in oil and gas drilling turbines and marine hydrokinetic (MHK) energy machines. Past uses of PCD bearings in oil and gas down-hole tool applications have proven them to be robust, long lived, and rugged [1]. To be effective in MHK machines, PCD bearings must demonstrate adequate bearing efficiency and life in a submerged marine environment not nearly as severe as an oil well bore or a gas well bore. This paper discusses the advantages PCD bearings could provide when used in underwater MHK energy machines. Laboratory test results are presented that can help predict the performance of PCD in these MHK applications. Results from three types of tests are presented including tests that measure bearing capacity, those that observe and qualify hydrodynamic properties during testing, and those that evaluate diamond wear rates through a test representing the life time of a bearing in a MHK energy application. Failure tests conducted to measure bearing capacity revealed the PCD bearing could well endure conditions found in MHK machines, and coefficient of friction (COF) tests demonstrated the PCD ability to move from a boundary lubrication regime, to mixed mode lubrication, and then become hydrodynamic. The PCD wear test was designed to simulate years in the life of a tidal stream power generator, an MHK energy machine, and showed the PCD life is more than adequate for the MHK application. Bearing capacity, COF, and wear observed during laboratory testing illustrate that PCD thrust bearings can provide a robust, long lasting, and low maintenance bearing in MHK applications.

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Kushnir, E. „Effect of Machine Tool Structure Dynamic on Machine Cutting Performances“. In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79769.

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Quality of machine tool structure is defined by it static and dynamic compliance. The effect of static stiffness at part shape and machine productivity is one of the reasons that structure static stiffness is used as a main criterion in machine design. The machine dynamic stiffness or compliance directly effect roundness (for example, profile of cross section in turning), surface finish, and indirectly tool life and life of machine components. These effects are defined by structure resistance to transmit vibration in cutting zone or other points of interest in machine tool structure. Dynamic compliance defines accuracy of machining, because it stipulates how machine response to any exciting force, occurring inside and outside machine structure. Dynamic compliance limits the productivity of cutting because it defines maximum depth of cut that may be achieved at a machine in particular set up. The goal of dynamic analysis is to find parameters of the structure that have dominant effect at it dynamic compliance and improve structure based at this information. Usually dynamic analyses required more complicated methodological approach because of coupling between different modes of vibration. The methodology of dynamic analysis of machine tool is illustrated by analysis of mobile spindle module and turning center. The obtained theoretical results are compared with actual testing data.

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Park, Young-Bin, und Jonathan S. Colton. „Die Life Prediction in Rapid Prototype Dies“. In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39362.

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To meet the growing demand for rapid, low-cost die fabrication technology in the sheet metal forming industry, easy-to-machine, polyurethane-based, composite board stock is used widely as a rapid tooling material. In practice, it is desirable to terminate die life by wear rather than by catastrophic fatigue. However, the failure mechanisms of the rapid prototyped tools are not clearly understood, thus making the prediction of tool life difficult. This paper presents a method to estimate the fatigue life of a sheet metal forming die fabricated from ATH (aluminum trihydrate)-filled polyurethane. A finite element model of 90° V-die bending process was developed, and the effects of process parameters on stress distribution in the punch and die were investigated through simulation. Mechanical testing was performed to characterize the fatigue properties of the tooling material. The computer-simulated results were verified through experiments using instrumented, laboratory-scale punch and die sets.

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Gomatam, Rajesh R., und Erol Sancaktar. „Fatigue Behavior of Electronically Conductive Adhesive Joints“. In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41659.

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This paper describes a novel fatigue-life prediction methodology aimed at providing the design engineer an easy fatigue life predictive tool using experimental data, for both cumulative fatigue damage, as well as constant loading fatigue conditions. This encompasses an integrated approach to joint testing, analysis, and modeling. Utilizing the proposed methodologies, we aim to predict the changes in fatigue life of the adhesive, based on the whole spectrum of test variables including temperature, humidity, stress ratio, preconditioning (variable stress ratios), and frequency. This modeling approach is expected to give the design engineer an initial assessment tool for the effects of detrimental fatigue conditions, eventually leading to a much improved fatigue life, improved fail-safe capability, and reduced manufacturing costs.

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Dogan, Bilal, und Thomas Hyde. „Industrial Application of Small Punch Testing for In-Service Component Condition Assessment: An Overview“. In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78691.

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The Sampling and Small Punch testing (SPT) is a powerful technique based on tests using miniaturized specimens machined out small sampled material of components in service. At present, it is the only existing method capable of providing experimental characterization of service exposed materials of components and materials of new built plants. Small sampling is non-invasive and SPT provides direct measured material properties. It provides a significant technology capability that facilitates assessing power plant operating equipment for structural integrity and operational condition. The new method provides utility members an attractive option to interrogate equipment for making run/inspect/repair/replace decisions. The SPT technique supported by assessment software, NDE and Metallography, used to define guidelines for components life assessment cross the power generation and petro-chemical sectors, serving both utilities, and constructors. It addresses the industrial need for personalized material and welds data required for a) lifing of plant; consumed life and residual life of components, b) convenience of repairing, replacing, life of the new welds on old components, c) cost of component deterioration, cost of normal service, d) characterizations and qualifications of blade repairs, of coating materials-methods. The first international SPT workshop was organized in June 27–28, 2011 in Nottingham, UK in order to discuss the state-of-the art SPT Creep and Fracture, and the draft CEN Cope of Practice (COP). The International SPT Experts Group serves as international forum for discussion and collaboration of industrial application of SPT methodology for in-service component life assessment. It is noted the draft CEN COP needs to be revised. Presently, European, Japanese and Indian national SPT project groups are running SPT tests and working on analysis programs. The present paper reports on a) the use of SPT in materials and component characterization, and b) drafted technical program by the international experts group to harmonize international efforts on SPT testing and analysis for efficiency and cost effectiveness. The draft program to bring the SPT methodology to standardization and develop an engineering component condition assessment tool for industrial application.

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