Links between BCT and Lifetime for Corrugated Boxes, 19PaperCon
An important performance characteristic of corrugated boxes is the ability to resist a compressive load for sufficient storage time without failure. In the laboratory, this is evaluated using creep-tests and measuring “lifetime” or time until failure. In design, the box compressive strength (BCT) or edge crush strength (ECT) combined with “factors of safety” are utilized to ensure sufficient lifetime. Lifetime measurements are subject to large variability, and BCT alone is not sufficient to predict lifetime in all situations. Creep testing, while important is time consuming, so it is of interest to determine if it is possible to extrapolate lifetime from both the variability and other box performance parameters. To investigate this, the lifetime measurements of two “identical” box types in terms of BCT were determined under conditions of 25% BCT constant load in a cyclic-humidity environment. Based on previous literature, a semi-empirical equation relating load to lifetime was utilized to predict variability in lifetime from variability in BCT. In addition, the McKee equation was utilized in a secondary role to predict lifetime. The present study reinforces the hypothesis that large variability in lifetime is associated with nonlinear magnification of load dependence on creep and that the typical variability in BCT of 8% yields lifetime variably that is large and increases with increased load level.
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Links between BCT and Lifetime for Corrugated Boxes, 19PaperCon
