The Experts below are selected from a list of 54174 Experts worldwide ranked by ideXlab platform
Peter Rhys Lewis - One of the best experts on this subject based on the ideXlab platform.
-
environmentally assisted Product Failure synopsis and case study compendium
Engineering Failure Analysis, 2008Co-Authors: Colin Gagg, Peter Rhys LewisAbstract:Abstract Corrosion science exhibits a major division between dry and wet corrosion. Dry corrosion is dominated by high temperature oxidation of metals and is controlled by the rate at which oxygen can diffuse through the oxide skin and by stable oxide adhesion to the metal substrate involved. Wet corrosion involves electrolytic interactions that require the presence of an aqueous solution. Good design can prevent onset of in service (wet) corrosion by limiting the contact of the electrolyte. However, changes in operational procedures and manufacture can reverse any good design practice. Furthermore, the combined effects of stress and corrosion can result in a special type of Failure known as stress corrosion cracking (SCC). Stress corrosion cracking presents an especially difficult problem, since not only is it highly localised but it can occur in environments that are only mildly corrosive to the material. The damaging concentration of harmful ions in that environment may be quite small and difficult to detect and, even in the absence of applied stress, residual stresses in a structure can often be of a sufficiently high level to cause SCC and Failure in service. The role of the forensic or Failure engineer in this arena is often to assess if basic design, manufacture and material choice reflect professional engineering practice. To this end a brief review of salient points relating to corrosion and stress corrosion as Product Failure mechanisms is presented and illustrated by numerous studies from the authors’ forensic casebooks.
-
Environmentally assisted Product Failure – Synopsis and case study compendium
Engineering Failure Analysis, 2008Co-Authors: Colin Gagg, Peter Rhys LewisAbstract:Abstract Corrosion science exhibits a major division between dry and wet corrosion. Dry corrosion is dominated by high temperature oxidation of metals and is controlled by the rate at which oxygen can diffuse through the oxide skin and by stable oxide adhesion to the metal substrate involved. Wet corrosion involves electrolytic interactions that require the presence of an aqueous solution. Good design can prevent onset of in service (wet) corrosion by limiting the contact of the electrolyte. However, changes in operational procedures and manufacture can reverse any good design practice. Furthermore, the combined effects of stress and corrosion can result in a special type of Failure known as stress corrosion cracking (SCC). Stress corrosion cracking presents an especially difficult problem, since not only is it highly localised but it can occur in environments that are only mildly corrosive to the material. The damaging concentration of harmful ions in that environment may be quite small and difficult to detect and, even in the absence of applied stress, residual stresses in a structure can often be of a sufficiently high level to cause SCC and Failure in service. The role of the forensic or Failure engineer in this arena is often to assess if basic design, manufacture and material choice reflect professional engineering practice. To this end a brief review of salient points relating to corrosion and stress corrosion as Product Failure mechanisms is presented and illustrated by numerous studies from the authors’ forensic casebooks.
-
wear as a Product Failure mechanism overview and case studies
Engineering Failure Analysis, 2007Co-Authors: Colin Gagg, Peter Rhys LewisAbstract:Abstract Tribology is the technology of interactive surfaces in relative motion, incorporating the science of friction, lubrication and wear. The subject is a recognised and researched area in its own right, being of interest to both the academic and engineering community. However, the attention of the forensic (or Failure) investigator will often focus on one area, that of any resultant wear processes at play during the service lifetime of a system, device or component. When engaged on a Product Failure investigation, it will be implicit in any instruction to establish whether or not the rate of wear was acceptable, reflected good engineering practice or that the device had simply reached the end of its useful service lifetime. To this end, a brief review of salient points relating to wear as a Product Failure mechanism is presented and illustrated by numerous studies from the authors’ forensic casebooks.
-
Wear as a Product Failure mechanism – Overview and case studies
Engineering Failure Analysis, 2007Co-Authors: Colin Gagg, Peter Rhys LewisAbstract:Abstract Tribology is the technology of interactive surfaces in relative motion, incorporating the science of friction, lubrication and wear. The subject is a recognised and researched area in its own right, being of interest to both the academic and engineering community. However, the attention of the forensic (or Failure) investigator will often focus on one area, that of any resultant wear processes at play during the service lifetime of a system, device or component. When engaged on a Product Failure investigation, it will be implicit in any instruction to establish whether or not the rate of wear was acceptable, reflected good engineering practice or that the device had simply reached the end of its useful service lifetime. To this end, a brief review of salient points relating to wear as a Product Failure mechanism is presented and illustrated by numerous studies from the authors’ forensic casebooks.
-
Post-graduate Forensic Engineering at The Open University
2006Co-Authors: Peter Rhys Lewis, Colin GaggAbstract:We have prepared a new course in forensic engineering in our post-graduate programme. It introduces the subject of Failure analysis in its widest sense, so includes Product Failure, accident investigation, and patent examination. With biannual presentation, it attracts about 80 students per year, and has a high retention record as well as excellent exam results. Most of our students have applied knowledge from the course in their jobs, with savings to their employers. However, the subject is poorly published with very few journals, and although metal Failures are described in standard texts, there is much less available on non-metal Product Failures.
Colin Gagg - One of the best experts on this subject based on the ideXlab platform.
-
environmentally assisted Product Failure synopsis and case study compendium
Engineering Failure Analysis, 2008Co-Authors: Colin Gagg, Peter Rhys LewisAbstract:Abstract Corrosion science exhibits a major division between dry and wet corrosion. Dry corrosion is dominated by high temperature oxidation of metals and is controlled by the rate at which oxygen can diffuse through the oxide skin and by stable oxide adhesion to the metal substrate involved. Wet corrosion involves electrolytic interactions that require the presence of an aqueous solution. Good design can prevent onset of in service (wet) corrosion by limiting the contact of the electrolyte. However, changes in operational procedures and manufacture can reverse any good design practice. Furthermore, the combined effects of stress and corrosion can result in a special type of Failure known as stress corrosion cracking (SCC). Stress corrosion cracking presents an especially difficult problem, since not only is it highly localised but it can occur in environments that are only mildly corrosive to the material. The damaging concentration of harmful ions in that environment may be quite small and difficult to detect and, even in the absence of applied stress, residual stresses in a structure can often be of a sufficiently high level to cause SCC and Failure in service. The role of the forensic or Failure engineer in this arena is often to assess if basic design, manufacture and material choice reflect professional engineering practice. To this end a brief review of salient points relating to corrosion and stress corrosion as Product Failure mechanisms is presented and illustrated by numerous studies from the authors’ forensic casebooks.
-
Environmentally assisted Product Failure – Synopsis and case study compendium
Engineering Failure Analysis, 2008Co-Authors: Colin Gagg, Peter Rhys LewisAbstract:Abstract Corrosion science exhibits a major division between dry and wet corrosion. Dry corrosion is dominated by high temperature oxidation of metals and is controlled by the rate at which oxygen can diffuse through the oxide skin and by stable oxide adhesion to the metal substrate involved. Wet corrosion involves electrolytic interactions that require the presence of an aqueous solution. Good design can prevent onset of in service (wet) corrosion by limiting the contact of the electrolyte. However, changes in operational procedures and manufacture can reverse any good design practice. Furthermore, the combined effects of stress and corrosion can result in a special type of Failure known as stress corrosion cracking (SCC). Stress corrosion cracking presents an especially difficult problem, since not only is it highly localised but it can occur in environments that are only mildly corrosive to the material. The damaging concentration of harmful ions in that environment may be quite small and difficult to detect and, even in the absence of applied stress, residual stresses in a structure can often be of a sufficiently high level to cause SCC and Failure in service. The role of the forensic or Failure engineer in this arena is often to assess if basic design, manufacture and material choice reflect professional engineering practice. To this end a brief review of salient points relating to corrosion and stress corrosion as Product Failure mechanisms is presented and illustrated by numerous studies from the authors’ forensic casebooks.
-
wear as a Product Failure mechanism overview and case studies
Engineering Failure Analysis, 2007Co-Authors: Colin Gagg, Peter Rhys LewisAbstract:Abstract Tribology is the technology of interactive surfaces in relative motion, incorporating the science of friction, lubrication and wear. The subject is a recognised and researched area in its own right, being of interest to both the academic and engineering community. However, the attention of the forensic (or Failure) investigator will often focus on one area, that of any resultant wear processes at play during the service lifetime of a system, device or component. When engaged on a Product Failure investigation, it will be implicit in any instruction to establish whether or not the rate of wear was acceptable, reflected good engineering practice or that the device had simply reached the end of its useful service lifetime. To this end, a brief review of salient points relating to wear as a Product Failure mechanism is presented and illustrated by numerous studies from the authors’ forensic casebooks.
-
Wear as a Product Failure mechanism – Overview and case studies
Engineering Failure Analysis, 2007Co-Authors: Colin Gagg, Peter Rhys LewisAbstract:Abstract Tribology is the technology of interactive surfaces in relative motion, incorporating the science of friction, lubrication and wear. The subject is a recognised and researched area in its own right, being of interest to both the academic and engineering community. However, the attention of the forensic (or Failure) investigator will often focus on one area, that of any resultant wear processes at play during the service lifetime of a system, device or component. When engaged on a Product Failure investigation, it will be implicit in any instruction to establish whether or not the rate of wear was acceptable, reflected good engineering practice or that the device had simply reached the end of its useful service lifetime. To this end, a brief review of salient points relating to wear as a Product Failure mechanism is presented and illustrated by numerous studies from the authors’ forensic casebooks.
-
Post-graduate Forensic Engineering at The Open University
2006Co-Authors: Peter Rhys Lewis, Colin GaggAbstract:We have prepared a new course in forensic engineering in our post-graduate programme. It introduces the subject of Failure analysis in its widest sense, so includes Product Failure, accident investigation, and patent examination. With biannual presentation, it attracts about 80 students per year, and has a high retention record as well as excellent exam results. Most of our students have applied knowledge from the course in their jobs, with savings to their employers. However, the subject is poorly published with very few journals, and although metal Failures are described in standard texts, there is much less available on non-metal Product Failures.
A Kulandaiyan - One of the best experts on this subject based on the ideXlab platform.
-
warranty cost estimation of a multi module Product
International Journal of Quality & Reliability Management, 2004Co-Authors: D K Manna, A KulandaiyanAbstract:This article deals with the problem of cost estimation for increased warranty time of a multi‐module Product. The warranty policy of interest is two‐dimensional involving warranty limits on both age and usage of the Product. Failure of the Product is caused due to malfunctioning of its module(s). Warranty service is rendered through repair or replacement of the respective module(s). From the past data, it is observed that age and usage are highly correlated. Based on life (age) data, the joint life distribution of the modules is well described by multivariate exponential distribution of Marshall and Olkin. The same is utilized to estimate cost for desired warranty times by the method of simulation.
-
Warranty cost estimation of a multi‐module Product
International Journal of Quality & Reliability Management, 2004Co-Authors: D K Manna, A KulandaiyanAbstract:This article deals with the problem of cost estimation for increased warranty time of a multi‐module Product. The warranty policy of interest is two‐dimensional involving warranty limits on both age and usage of the Product. Failure of the Product is caused due to malfunctioning of its module(s). Warranty service is rendered through repair or replacement of the respective module(s). From the past data, it is observed that age and usage are highly correlated. Based on life (age) data, the joint life distribution of the modules is well described by multivariate exponential distribution of Marshall and Olkin. The same is utilized to estimate cost for desired warranty times by the method of simulation.
W Mcmahon - One of the best experts on this subject based on the ideXlab platform.
-
prediction of logic Product Failure due to thin gate oxide breakdown
International Reliability Physics Symposium, 2006Co-Authors: Neal R Mielke, M Agostinelli, S Gupta, R Lu, W McmahonAbstract:Gate oxide breakdown is a key mechanism limiting IC lifetime. Breakdown is typically characterized on test capacitors, but estimating Product reliability from such results requires making a number of often-untested assumptions. This work compares the predictions of capacitor-based models to results from accelerated lifetest of logic CPU Products. For the technology studied, lifetest Failure rate was somewhat lower than model prediction, and Failure analysis indicated that an important factor was the different sensitivities of logic circuits vs. cache cells and of n and p transistors in the cache. Analysis of the factors involved in determining oxide-breakdown reliability and of the statistical uncertainties in capacitor-based models indicates that it is important to calibrate models to Product data including these effects. Once a model is validated, the paper discusses how it can be used to assess the reliability impact of changes in processing, use conditions, and circuit design.
Stephen K. Markham - One of the best experts on this subject based on the ideXlab platform.
-
perspective new Product Failure rates influence of argumentum ad populum and self interest
Journal of Product Innovation Management, 2013Co-Authors: George Castellion, Stephen K. MarkhamAbstract:A persistent myth in Product innovation and management is that the Failure rate of new Products is 80% or higher. How does this false idea continue to displace the conclusions of empirical studies since 1977 that the new Product Failure rate is 40% or less? We examine the influence of a fallacy that encourages people's unthinking acceptance of ideas on new Product Failure rates and whose appeal rests primarily on an emotional, rather than a reasoned, argument. Self-interest also plays a major role in keeping this myth alive.
-
Perspective: New Product Failure Rates: Influence of Argumentum ad Populum and Self‐Interest
Journal of Product Innovation Management, 2012Co-Authors: George Castellion, Stephen K. MarkhamAbstract:A persistent myth in Product innovation and management is that the Failure rate of new Products is 80% or higher. How does this false idea continue to displace the conclusions of empirical studies since 1977 that the new Product Failure rate is 40% or less? We examine the influence of a fallacy that encourages people's unthinking acceptance of ideas on new Product Failure rates and whose appeal rests primarily on an emotional, rather than a reasoned, argument. Self-interest also plays a major role in keeping this myth alive.
