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Effectiveness verification of the hybrid free‐fall test
Author(s) -
Piao Meishu,
Saito Katsuhiko,
Kawaguchi Kazuaki,
Zhong Chen
Publication year - 2018
Publication title -
packaging technology and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 50
eISSN - 1099-1522
pISSN - 0894-3214
DOI - 10.1002/pts.2324
Subject(s) - cushioning , drop test , acceleration , product design , design of experiments , product (mathematics) , engineering , mechanical engineering , simulation , structural engineering , computer science , mathematics , statistics , physics , geometry , classical mechanics
Free‐fall tests are generally conducted as the last verification step in the cushioning package design process. However, in practice, design requirements are often not met in a single pass of verification testing and two or three repetitions of the ‘design and test’ steps are typically required, necessitating significant amounts of labour and material resources. Therefore, if the product is a prototype or an expensive product, repeated testing is difficult due to the limited quantity or high cost of samples. For such cases, a new method called the ‘hybrid free‐fall test’ is proposed for preventing damage to a tested product. Using this method, the peak shock acceleration occurring during a target (high) free‐fall height test can be predicted using the data from a safety free‐fall height test. The packaged product is usually conceptually modelled to assist in packaging research, and so far, several physical models have been proposed. In this study, we review one such model, the friction‐viscous damping model, and propose a new prediction method for the hybrid free‐fall test in which a reconsidered friction‐viscous damping model is applied. Furthermore, we used expanded polyethylene and structured corrugated sleeve cushioning materials for verification and considered an effective physical model for each cushioning material.