Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

New Edge Crush Test Configuration Enhanced with Full-Field Strain Measurements

Version 1 : Received: 31 August 2021 / Approved: 1 September 2021 / Online: 1 September 2021 (14:20:05 CEST)

How to cite: Garbowski, T.; Knitter-Piątkowska, A.; Marek, A. New Edge Crush Test Configuration Enhanced with Full-Field Strain Measurements. Preprints 2021, 2021090019 (doi: 10.20944/preprints202109.0019.v1). Garbowski, T.; Knitter-Piątkowska, A.; Marek, A. New Edge Crush Test Configuration Enhanced with Full-Field Strain Measurements. Preprints 2021, 2021090019 (doi: 10.20944/preprints202109.0019.v1).

Abstract

The standard edge crush test (ECT) allows to determine the crushing strength of the corrugated cardboard. Unfortunately, this test cannot be used to estimate the compressive stiffness, which is an equally important parameter. It is because, any attempt to determine this parameter using current lab equipment quickly ends in a fiasco. The biggest obstacle is obtaining a reliable measurement of displacements and strains in the corrugated cardboard sample. In this paper, we present a method that not only allows to reliably identify the stiffness in the loaded direction of orthotropy in the corrugated board sample, but also the full orthotropic material stiffness matrix. The proposed method uses two samples: (a) traditional, cut crosswise to the wave direction of the corrugated core, and (b) cut at an angle of 45 degrees. Additionally, in both cases, an optical system with digital image correlation (DIC) is used to measure the displacements and strains on the outer surface of samples. The use of a non-contact measuring system allows to avoid using the measurement of displacements from the crosshead, which is burdened with a large error. Apart from the new experimental configuration, the article also proposes a simple algorithm to quickly characterize all sought stiffness parameters. The obtained results are finally compared with the results obtained in the homogenization procedure of the cross-section of the corrugated board. The results were consistent in both cases.

Keywords

corrugated cardboard; edge crush test; orthotropic elasticity; digital image correlation, tensile stiffness, compressive stiffness, sandwich panel

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.