Transferring momentum: Novel drop protection concept for mobile devices

Hughes, Kevin; Vignjević, Rade; Corcoran, Fergal; Gulavani, Omkar; Vuyst, Tom De; Campbell, J.; Djordjevic, Nenad

doi:10.1016/j.ijimpeng.2018.03.001

Cited by 4 publications

(9 citation statements)

References 13 publications

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“…Because the floor is restricted to all degrees of freedom, we set CMO to 1 and CON1 and CON2 to 7. Because the outer case produces a large plastic deformation, *MAT_SIMPLIFIED_JOHNSON_COOK is given to more accurately simulate the plastic deformation process of the outer case, where A = 174.02 Mpa, B = 142.07 Mpa, N = 0.2196, and C = 0 [9]. The LCD glass and outer glass are assigned *MAT_ELASTIC.…”

Section: Definition Of the Model Materialsmentioning

confidence: 99%

“…When the smartphone was dropped in the upper and lower right corners, the maximum Von Mises stress on the screen was greater, but the force between the screen and the case could not be determined. Kevin et al [9] studied the local debonding failure between the screen and case of the tablet through experiments combined with simulation, used the finite element method to model the adhesive layer between the screen and case, used the deletion of the adhesive layer elements to simulate the debonding between the screen and case, and designed a protective casing using the concept of protection. However, removing the elements causes energy loss.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Debonding Failures of the Screen and Case during Tablet Drop

Zhu,

Jin,

Wang

et al. 2023

Sustainability

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In recent years, due to the increasingly powerful functions of tablets, more and more people have used tablets. The failure of the screen caused by debonding failure between the screen and the case of the tablet due to drops will affect the normal use of the tablet. However, there have been few studies on the debonding methods of the screen and the case of the tablet, as well as the factors influencing the debonding between the screen and the case of the tablet. Numerical analysis software was used in this paper to simulate the iPad Air (Air) drop process, and the cohesive zone model and tiebreak contact were used to simulate the debonding process between the screen and case of the Air tablet, respectively. When the results are compared to the experiments, the results show that the cohesive zone model is superior. The effects of various rounded corner radii, drop postures in the XY plane, materials of the outer case, and strain rates of PC/ABS on the localized debonding between the outer case and outer glass of the Air during the drop process were investigated. The degree of debonding between the Air model’s outer case and outer glass is defined by t, which is the ratio of the area of the deleted cohesive elements to the total area of the cohesive elements. The results show that the rounded corner radius and the strain rate of PC/ABS have less influence on t; the t of the Air model dropped at 45° in the XY plane is 37.7% of that dropped at 0° and 90°; and the t of the Air model with glass as the outer case material is 48% of that with aluminum alloy as the outer case material. These studies serve as a foundation for tablet design and material selection.

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Section: Definition Of the Model Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Debonding Failures of the Screen and Case during Tablet Drop

Zhu,

Jin,

Wang

et al. 2023

Sustainability

View full text Add to dashboard Cite

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“…After reviewing the literature, most of the papers related to the drops are electronic equipment, and no papers were found on the application of numerical simulation of the accelerometer with this test bench [13,14,15,16,17,18,19,20,21,22]. Therefore, this review was extended to consider impact-loading of the whole experimental system, which is the simulation technology of virtual experiment.…”

Section: Structural Design and Analysismentioning

confidence: 99%

Simulation-Based Design and Optimization of Accelerometers Subject to High-Temperature and High-Impact Loads

Tian

Dan

et al. 2019

Sensors

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Due to multi-factor coupling behavior, the performance evaluation of an accelerometer subject to high-temperature and high-impact loads poses a significant challenge during its design phase. In this paper, the simulation-based method is applied to optimize the design of the accelerometer. The proposed method can reduce the uncertainties and improve the fidelity of the simulation in the sense that (i) the preloading conditions of fasteners are taken into consideration and modeled in static analysis; (ii) all types of loadings, including bolt preloads, thermal loads, and impact loads, are defined in virtual dynamic prototype of the accelerometer. It is our finding that from static and dynamic analysis, an accelerometer is exposed to the risk of malfunction and even a complete failure if the temperature rises to a certain limit; it has been proved that the thermal properties of sensing components are the most critical factors for an accelerometer to achieve its desired performance. Accordingly, we use a simulation-based method to optimize the thermal expansion coefficient of the sensing element and get the expected design objectives.

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“…The packaging design also functions as a crucial component in the packaging value chain because it determines the materials, manufacturing process, and environmentally friendly options for disposal [ 3 , 4 ]. The molded expanded polystyrene (EPS) cushion serves as protective packaging to prevent a product from shock and vibration impacts [ 4 , 5 , 6 ]. This packaging application has been extensively utilized across many industries, not only in food packaging, but also for all kinds of fast-moving consumer goods and household and electronic appliances [ 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Today’s manufacturing industry is rapidly evolving to provide competitive products [ 6 , 22 ]. This product development is also improving in parallel with new technologies nowadays [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Packaging Design for Molded Expanded Polystyrene Cushion

et al. 2023

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A molded expanded polystyrene (EPS) cushion is a flexible, closed-cell foam that can be molded to fit any packing application and is effective at absorbing shock. However, the packaging waste of EPS cushions causes pollution to landfills and the environment. Despite being known to cause pollution, this sustainable packaging actually has the potential to reduce this environmental pollution because of its reusability. Therefore, the objective of this study is to identify the accurate design parameter that can be emphasized in producing a sustainable design of EPS cushion packaging. An experimental method of drop testing and design simulation analysis was conducted. The effectiveness of the design parameters was also verified. Based on the results, there are four main elements that necessitate careful consideration: rib positioning, EPS cushion thickness, package layout, and packing size. These parameter findings make a significant contribution to sustainable design, where these elements were integrated directly to reduce and reuse packaging material. Thus, it has been concluded that 48 percent of the development cost of the cushion was decreased, 25 percent of mold modification time was significantly saved, and 27 percent of carbon dioxide (CO₂) reduction was identified. The findings also aided in the development of productive packaging design, in which these design elements were beneficial to reduce environmental impact. These findings had a significant impact on the manufacturing industry in terms of the economics and time of the molded expanded polystyrene packaging development.

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Transferring momentum: Novel drop protection concept for mobile devices

Cited by 4 publications

References 13 publications

Analysis of Debonding Failures of the Screen and Case during Tablet Drop

Analysis of Debonding Failures of the Screen and Case during Tablet Drop

Simulation-Based Design and Optimization of Accelerometers Subject to High-Temperature and High-Impact Loads

Sustainable Packaging Design for Molded Expanded Polystyrene Cushion

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