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research-article

Phenomenological Modeling of Carpeted Surface for Drop Simulation of Portable Electronics

[+] Author and Article Information
Pavana Sirimamilla

Microsoft Hardware Group, One Microsoft Way, Microsoft, Redmond, Washington - 98052, USA
abhisiri@microsoft.com

Hua Ye

Microsoft Hardware Group, One Microsoft Way, Microsoft, Redmond, Washington - 98052, USA
huaye@microsoft.com

Yinan Wu

Microsoft Hardware Group, One Microsoft Way, Microsoft, Redmond, Washington - 98052, USA
yinan.wu@microsoft.com

1Corresponding author.

ASME doi:10.1115/1.4042978 History: Received October 23, 2017; Revised February 11, 2019

Abstract

Using Finite Element (FE) analysis to simulate drop impact is widely adopted by the consumer electronics industry in the design process of portable devices. Most of such simulations model impact surface as a rigid or simple elastic surface. While this approach is valid for many common hard surfaces such as wood, tile, or concrete, it often does not provide a realistic risk assessment if the impact surface is a soft surface such as carpet. This paper describes a methodology to create a material model for carpeted impact surface that is suited for FE drop simulation. A multi-layer Hyperelastic-Viscoelastic material model is used to model the mechanical response of the carpet under mechanical impact. Quasi-static and impact testing on the industrial carpet were performed to calibrate the model parameters with the help of optimization. Validation of the model was done by comparing the simulation predictions with measurements from the impact tests performed at different heights. Much better correlation between experimental measurements and simulation predictions were observed when using the multi-layer Hyper-Visco-Elastic model for carpet than using a single layer homogenous model. This approach can provide a better estimate and a more accurate representation for device drop risk on carpeted surfaces for design and development of portable products. The methodology can also be used to derive material models for other similar impact surfaces.

Copyright (c) 2019 by ASME
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