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1 – 5 of 5Ryan S.H. Yang, Derek R. Braden, Guang‐Ming Zhang and David M. Harvey
The purpose of this paper is to evaluate the application of an acoustic micro‐imaging (AMI) inspection technique in monitoring solder joints through lifetime performance and…
Abstract
Purpose
The purpose of this paper is to evaluate the application of an acoustic micro‐imaging (AMI) inspection technique in monitoring solder joints through lifetime performance and demonstrate the robustness of the monitoring through analysis of AMI data.
Design/methodology/approach
Accelerated thermal cycling (ATC) test data on a flip chip test board were collected through AMI imaging. Subsequently, informative features and parameters of solder joints in acoustic images were measured and analysed. Through analysing histogram distance, mean intensity and grey area of the solder joints in acoustic images, cracks between the solder bump and chip interface were tracked and monitored. The results are in accord with associated Finite Element (FE) prediction.
Findings
At defective bumps, the formation of a crack causes a larger acoustic impedance mismatch which provides a stronger ultrasound reflection. The intensity of solder joints in the acoustic image increase according to the level of damage during the ATC tests. By analysing the variation of intensity and area, solder joint fatigue failure was monitored. A failure distribution plot shows a normal distribution pattern, where corner joints have the lowest reliability and are more likely to fail first. A strong agreement between AMI monitoring test data and FE prediction was observed, demonstrating the feasibility of through lifetime monitoring of solder joints using AMI.
Originality/value
The paper indicates the feasibility of the novel application of AMI inspection to monitor solder joint through lifetime performance non‐destructively. Solder joints' real life conditions can be tracked by an AMI technique, hence solder joint fatigue failure cycles during the ATC tests can be monitored and analysed non‐destructively.
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In the last four years, since Volume I of this Bibliography first appeared, there has been an explosion of literature in all the main functional areas of business. This wealth of…
Abstract
In the last four years, since Volume I of this Bibliography first appeared, there has been an explosion of literature in all the main functional areas of business. This wealth of material poses problems for the researcher in management studies — and, of course, for the librarian: uncovering what has been written in any one area is not an easy task. This volume aims to help the librarian and the researcher overcome some of the immediate problems of identification of material. It is an annotated bibliography of management, drawing on the wide variety of literature produced by MCB University Press. Over the last four years, MCB University Press has produced an extensive range of books and serial publications covering most of the established and many of the developing areas of management. This volume, in conjunction with Volume I, provides a guide to all the material published so far.
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ANDREW Carnegie stands apart from all other library benefactors. No other man has given so much, or given so widely, in the cause of library progress. Although the United Kingdom…
Abstract
ANDREW Carnegie stands apart from all other library benefactors. No other man has given so much, or given so widely, in the cause of library progress. Although the United Kingdom was not the main recipient of his bounty, it received from him, personally, about £12 million, and considerable sums, in addition, from the Trust which he founded. It might well be expected, therefore, that his name would always be in our minds and that we would remember him more kindly than any other library benefactor. But it is not so.
Joyce Payne and Aurelia Stephen
If you are 30 or older, you are middle‐aged by someone's criteria. When the college students of the 1970s declared “Don't trust anyone over 30,” did you think they would be…
Abstract
If you are 30 or older, you are middle‐aged by someone's criteria. When the college students of the 1970s declared “Don't trust anyone over 30,” did you think they would be someday talking about you? And what about those who say “Life begins at 40”? Did you ever believe them?