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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

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Volume 72, Issue 8

Issues

Low-velocity impact response of wood-strand sandwich panels and their components

Mostafa Mohammadabadi
  • Material Science and Engineering Program and Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA
  • Other articles by this author:
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/ Vikram Yadama
  • Corresponding author
  • Department of Civil and Environmental Engineering and Composite Materials and Engineering Center, Washington State University, Pullman, WA 99164, USA, Phone: +1 509 335 6261
  • Email
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  • De Gruyter OnlineGoogle Scholar
/ LiHong Yao
  • College of Material Science and Art Design, Inner Mongolia Agriculture University, Hohhot 010018, China
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/ Debes Bhattacharyya
  • Department of Mechanical Engineering, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Published Online: 2018-04-25 | DOI: https://doi.org/10.1515/hf-2017-0169

Abstract

Profiled hollow core sandwich panels (SPs) and their components (outer layers and core) were manufactured with ponderosa and lodgepole pine wood strands to determine the effects of low-velocity impact forces and to observe their energy absorption (EA) capacities and failure modes. An instrumented drop weight impact system was applied and the tests were performed by releasing the impact head from 500 mm for all the specimens while the impactors (IMPs) were equipped with hemispherical and flat head cylindrical heads. SPs with cavities filled with a rigid foam insulation material (SPfoam) were also tested to understand the change in EA behavior and failure mode. Failure modes induced by both IMPs to SPs were found to be splitting, perforating, penetrating, core crushing and debonding between the core and the outer layers. SPfoams absorbed 26% more energy than unfilled SPs. SPfoams with urethane foam suffer less severe failure modes than SPs. SPs in a ridge-loading configuration absorbed more impact energy than those in a valley-loading configuration, especially when impacted by a hemispherical IMP. Based on the results, it is evident that sandwich structure is more efficient than a solid panel concerning impact energy absorption, primarily due to a larger elastic section modulus of the core’s corrugated geometry.

Keywords: corrugated core; energy absorption; impact behavior; insulated sandwich panel; sandwich panel; sheathing material; wood-strand composite

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About the article

Received: 2017-10-20

Accepted: 2018-03-20

Published Online: 2018-04-25

Published in Print: 2018-07-26


Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

Research funding: None declared.

Employment or leadership: None declared.

Honorarium: None declared.


Citation Information: Holzforschung, Volume 72, Issue 8, Pages 681–689, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2017-0169.

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