ISSN:0748-8017    

DOI:10.1002/qre.4680030302

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680030303

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe basic conditions for using the load‐strength theory is listed. The use of the theory as a modelling tool—a way of thinking, is discussed. The theory is used to explain differences and similarities in failure patterns of mechanics and electronics. Further, real data is shown for load‐strength in an electronic s

ISSN:0748-8017    

DOI:10.1002/qre.4680030304

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractDevelopment of stress screens is discussed including selection of stimuli appropriate to the defect types sought, selection of screen levels and then finally proof of screen tests.

ISSN:0748-8017    

DOI:10.1002/qre.4680030305

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractDesigning products which require maintenance always involves compromises between reliability and maintainability. Both scheduled and preventive maintenance (PM) should be considered in the design phases of a product so that the design can include features to ease the maintenance task. In addition, many design decisions based on Failure Modes and Effects Criticality Analysis (FMECA), Pareto criticality rankings, etc., could and should be strongly influenced by the potential for using preventive maintenance. A component that has a major negative impact on system reliability (because of its life distribution)could become much less consequentialif appropriate PM policies are implemented. This paper describes the use of an easy‐to‐implement analysis procedure to assist adesignerorsystems analystin making the reliability/maintainability trade

ISSN:0748-8017    

DOI:10.1002/qre.4680030306

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThis paper deals with the part that education and training plays in the achievement of quality.The initial section examines the role of the Government sponsored Directory of Quality Training and Education in the U.K. and the aims of the National Quality Campaign. It assesses how successful the courses outlined in the Directory might be in providing sufficient stimulus for a change in attitude towards quality within industry particulraly with regard to satisfying the identified aims of the campaign. The conclusions that are drawn as a result indicate that there are several problems that need to be resolved before progress can be assured.The final section details what progress has already been made in the pursuit of improved quality and looks at various alternative methods of education and training that have been proposed to aid the process of change.

ISSN:0748-8017    

DOI:10.1002/qre.4680030307

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe reappearance of ‘purple plague’ as a reliability and failure risk in current IC devices has led to renewed interest in the precise failure mechanisms and eventual failure mode. These are outlined and illustrated with examples of recent failures in plastic encapsulated integrated circuits, hermetically sealed integrated circuits and hybrids. The reasons for the reappearance of this type of failure are discussed, and it is shown that the problem may be expected to increase in future generation devi

ISSN:0748-8017    

DOI:10.1002/qre.4680030308

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractThe equipment and associated methodology of a new technique for checking the susceptibility of plastic‐encapsulated ICs to moisture ingress is presented. The basis of the new technique is to immerse unbiased ICs in a salt solution and to subject them to high temperatures (in the range 120°C to 175°C) and to high pressures (2 to 9 atmospheres). At the highest temperature, results can be obtained within a few hours, although a 20 h test at 165°C is suggested as a screen for components. The test is extremely simple to carry out and a testing facility can be quickly established. Using CMOS components from five different vendors, good agreement has been obtained between the results from the new test and the results from a biased 85°C/85 percent RH

ISSN:0748-8017    

DOI:10.1002/qre.4680030309

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

摘要:

AbstractFor electronic equipment and systems a correspondance of predominant faults is observed during the electrical test phases at board and at system level prior to use, and during subsequent application of the system. Relationships are expected based on the common causes of these faults. Such faults might be those that have escaped detection during electrical testing, faults that induce secondary latent defects on parts, or original latent defects incorporated in the installed components. Causes and effects are discussed.Measures have been taken over several years to improve the manufacturing quality of electronic equipment following these aspects. It is shown, by practical experience with an electronic communication system, that an improvement of manufacturing quality by a factor of 5 has increased system reliability by about the same degree.This noticeable effect of the manufacturing quality of printed circuit board assemblies on the reliability of the system and on the failure rates of installed components is not considered by usual reliability prediction models. The observed failure rates of components are low when compared to values of prediction models, even including those component types contributing to focal points of failure with the achieved level of reliability.

ISSN:0748-8017    

DOI:10.1002/qre.4680030310

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY

ISSN:0748-8017    

DOI:10.1002/qre.4680030311

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1987

数据来源: WILEY