Volume 38, Issue 6 (November 2010)

    Evaluation of the Stress-Energy Methodology to Predict Transmitted Shock through Expanded Foam Cushions

    (Received 7 September 2009; accepted 30 March 2010)

    Published Online: 2010

    CODEN: JTEOAD

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    Abstract

    Mechanical stresses experienced by packages in the distribution environment include shock and vibration amongst several others. The destructive effects of these hazards can typically be restricted by using cushioning materials to help protect fragile goods during distribution. ASTM D1596 is the conventional standard used to determine shock absorbing performance of a cushioning material for a given combination of static loading, thickness, and drop height. This industry-accepted standard, however, requires significant amounts of transmitted shock data and can be expensive with respect to costs associated with testing and materials amongst others. Alternate stress-energy-based methodologies, developed in the past decade, recommending a considerable reduction in the number of drop tests while providing the ability to predict transmitted shock for any drop height, static loading as well as cushion thickness, are evaluated in this study for their stated accuracy. Based upon an in-depth evaluation of dynamic cushion curves for closed cell moldable foams generated using ASTM D1596, this research evaluates the accuracy of the proposed methodology in relation to the prediction of transmitted shock. Results show that the stress-energy methods while saving time in predicting transmitted shock, produce higher degrees of error than the ±5 % previously stated. In addition, they cannot predict behavior of cushions, and transmitted shock at high drop heights and static loadings with thin cushions, where only the measured values are accurate.


    Author Information:

    Singh, J.
    Industrial Technology, Cal Poly State Univ., San Luis Obispo, CA

    Ignatova, L.
    Statistics, Cal Poly State Univ., San Luis Obispo, CA

    Olsen, E.
    Industrial Technology, Cal Poly State Univ., San Luis Obispo, CA

    Singh, P.
    Packaging, Michigan State Univ., East Lansing, MI


    Stock #: JTE102722

    ISSN: 0090-3973

    DOI: 10.1520/JTE102722

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    Author
    Title Evaluation of the Stress-Energy Methodology to Predict Transmitted Shock through Expanded Foam Cushions
    Symposium , 0000-00-00
    Committee D10