Drop impact survey of portable electronic products

Lim, Chwee Teck; Ang, Chyuen Wei; Tan, Li; Seah, S.K.W.; Wong, E.H.

doi:10.1109/ectc.2003.1216265

Cited by 81 publications

(41 citation statements)

References 2 publications

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“…Of course, more rigorous analysis and FEM modelling using computers would be required during later phases of the design process, but until that time, analytical tools clearly have their strengths and uses, particularly if backed up with small-scale experiments to measure k p . Apart from this, the drop test facility used in this study shows its usefulness as an experimental tool: the guide-andrelease set-up employed allows reproducible drops across a range of contact angles, in accordance with the pioneering work of Goyal & Buratynski [9] and the improvements made by Lim et al [7]. The use of twin accelerometers as presented here appears to be a novel and promising extension of their work, particularly since it allows systematic study of product variables with respect to impact resistance.…”

Section: Discussionmentioning

confidence: 79%

“…Publications involving full products are more scarce: e.g. Lim et al [7] performed drop impact tests on cell phones and PDA's, but without analysis; Singh et al [8] combined analysis with simulations, but performed no experimental validation; Zhou et al [6] did both. Such studies are useful for examining the effects of small, 'steel safe' changes late in the product development process, but they are not directly suitable for supporting choices at earlier stages (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Analytical Study of Free-Fall Drop Impact Testing of Portable Products

2012

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Portable products can suffer critical damage due to drop impact and thus, such load cases must be taken into account in the conceptual and detailed design phases of such products. One method explored in the current study for alleviating the peak accelerations resulting from impact is to isolate fragile components from the product housing using internal shock mounts. There is a lack of studies that address this method in a systematic and reliable manner. This paper presents an experimental and analytical study on the dynamic behaviour during impact of portable products with internal shock mounting. Using a special drop tower with guiding frame for controlled-angle free-fall drop impact, representative products are dropped at different angles and the acceleration is recorded both on the outer case and on an internally-mounted plate. A simplified analytical procedure, suitable for conceptual design purposes, is proposed for predicting the resulting dynamic response. The work affirms the suitability of guide-and-release facilities in impact experiments; additionally, it may facilitate the conceptual design for impact resistance of portable products.

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Section: Discussionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Study of Free-Fall Drop Impact Testing of Portable Products

2012

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“…[4] and Lim C. T. et al [5,6] to investigate drop impact response of several models of PDAs and mobile phones. Impact force, strains and level of acceleration induced at the PCB were measured and compared in different orientations.…”

Section: Introductionmentioning

confidence: 99%

“…This block is then hoisted to the desired drop height and released to undergo free fall. Just prior to impact, the product is quickly released from the grippers at the specified orientation.Comprehensive tests were conducted by Seah et al[4] and Lim C. T. et al [5,6] to investigate drop impact response of several models of PDAs and mobile phones. Impact force, strains and level of acceleration induced at the PCB were measured and compared in different orientations.…”

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confidence: 99%

Drop impact of a typical portable electronic device

Zhou¹,

Yu²,

Lee³

2006

Structures Under Shock and Impact IX

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Drop impact reliability is an important concern for the design and use of portable electronic products. When the product is accidentally dropped on the ground, impact forces are transmitted from the product case to the printed circuit board (PCB) and other components within the case. These forces may cause severe functional damage in the form of component failure and/or interconnection breakage. This paper reports our investigation on the dynamic behaviours of a typical portable electronic device under drop impact loading. Firstly, an idealized system which contains an outer case and a PCB attached with a package was adopted as specimen. With an innovative design, the actual impact force pulses were measured by employing a Hopkinson bar in the dynamic test rig. Dynamic strains of the PCB were simultaneously recorded to explore the correlation between the strains and the impact pulse. Particular attention has been paid to the dependence of the shock response of the PCB on the impact velocity, impact force pulse, as well as the impact orientation. Analysis is carried out to explain the experimental results. A deep understanding of the shock response of typical electronic product systems will help to guide the design of rugged and highly impact-resistant devices Keywords: portable electronic products, drop test, impact. IntroductionBenefit from the advancements of new technologies, electronic components have become smaller, thinner and lighter. Today, portable electronics, such as cellular phones, PDAs (personal digital assistants), digital cameras etc. Kowloon, Hong Kong, China substantial market share worldwide. It should be noted, however, that portable devices are often exposed to relatively harsh operating environments due to the likelihood of dropping these devices and also making impact with other objects. And drop/impact induces failure is one of the most dominant causes of damage for portable devices. Therefore, drop impact reliability is one of the major concerns in product design.Traditionally, the rigidity of products is obtained through a design-failureredesign process. It is evident from engineering practice that in order to improve the shock protection of portable electronics, instead of making protective designs on a trial-and-error basis, one must understand how electronic components or portable electronic devices respond to shock and impact loading. And drop testers were firstly designed by researchers to assess drop/impact performance of the products. Jason Wu et al. [1] pointed out that drop tests through hand-drop and eye-check can only give a qualitative but no quantitative information about impact behavior. They introduced a drop tester which can control drop orientation by two slide cables. In order to control the orientation of the object at impact and to instrument the drop tests, S. Goyal and E. K. Buratynski [2] also proposed a method that the specimen be suspended onto a guided drop-table in desired orientation. The drop-table hits the ground first, but just before impact, the t...

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“…Lim and Low [4] proposed a method to examine the drop impact responses of portable electronic products at different impact orientations and drop height. The impact behavior has been studied at the product level [5]. After comprehensive drop tests, failure analysis, and simulations on two ball grid array (BGA) packages at the board level, Tee, et al [6] developed a life prediction model for board level drop testing.…”

Section: Previous Workmentioning

confidence: 99%

Drop Impact Reliability Testing Lead-Free Chip Scale Packages

Farris¹

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Drop impact survey of portable electronic products

Cited by 81 publications

References 2 publications

Experimental and Analytical Study of Free-Fall Drop Impact Testing of Portable Products

Experimental and Analytical Study of Free-Fall Drop Impact Testing of Portable Products

Drop impact of a typical portable electronic device

Drop Impact Reliability Testing Lead-Free Chip Scale Packages

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