TY - JOUR
T1 - Mechanical characteristics of wood-bark interface of shrub willow
AU - Chahal, Azadwinder
AU - Ciolkosz, Daniel
AU - Puri, Virendra
AU - Jacobson, Michael
AU - Liu, Jude
N1 - Funding Information:
This work is supported in part by the USDA National Institute of Food and Agriculture and Hatch Appropriations under Project #PEN04697 and Accession # 1019212 . The authors also acknowledge the Northeast Sun Grant for financial support for conducting experiments. Also, the first author like to thank Kuldeep Kaur for support while preparing this manuscript during these strange times of COVID 19 pandemic.
Publisher Copyright:
© 2020
PY - 2021/4
Y1 - 2021/4
N2 - The mechanical behavior of the wood-bark interface of shrub willow was tested to investigate the influence of key factors: harvest season, moisture content, and cultivars. The mechanical properties enable the design and optimization of the performance of debarking equipment for short-rotation woody stems and can help improve understanding of the mechanical performance of the wood-bark interface. Results show that the low moisture content samples have a significantly higher shear modulus, G (Mean =0.34 GPa) and modulus of toughness Ut (Mean = 12.84 kPa). However, the degree of ductility (0.02) and the ratio of ultimate strain εu to strain ε50 (2.18) are lower for low moisture content samples. Different willow cultivars have no significant influence on the mechanical properties of the wood-bark interface tested. Results also reveal that the values of ultimate strain εu (0.11), modulus of toughness Ut (16.09 kPa), and degree of ductility (0.031) are significantly higher for samples collected in the dormant season compared to the growing season. Covariance analysis reveals that aspect ratio of the sample has a significant effect on shear modulus, G (p = 0.041), ultimate strain, εu (p = 0.008), modulus of toughness (p = 0.012) and degree of ductility (p = 0.001). Identifying the combination of these desirable properties provides a framework to achieve the maximum debarking efficiency and effectiveness for short-rotation woody crops.
AB - The mechanical behavior of the wood-bark interface of shrub willow was tested to investigate the influence of key factors: harvest season, moisture content, and cultivars. The mechanical properties enable the design and optimization of the performance of debarking equipment for short-rotation woody stems and can help improve understanding of the mechanical performance of the wood-bark interface. Results show that the low moisture content samples have a significantly higher shear modulus, G (Mean =0.34 GPa) and modulus of toughness Ut (Mean = 12.84 kPa). However, the degree of ductility (0.02) and the ratio of ultimate strain εu to strain ε50 (2.18) are lower for low moisture content samples. Different willow cultivars have no significant influence on the mechanical properties of the wood-bark interface tested. Results also reveal that the values of ultimate strain εu (0.11), modulus of toughness Ut (16.09 kPa), and degree of ductility (0.031) are significantly higher for samples collected in the dormant season compared to the growing season. Covariance analysis reveals that aspect ratio of the sample has a significant effect on shear modulus, G (p = 0.041), ultimate strain, εu (p = 0.008), modulus of toughness (p = 0.012) and degree of ductility (p = 0.001). Identifying the combination of these desirable properties provides a framework to achieve the maximum debarking efficiency and effectiveness for short-rotation woody crops.
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U2 - 10.1016/j.indcrop.2020.113236
DO - 10.1016/j.indcrop.2020.113236
M3 - Article
AN - SCOPUS:85100406896
SN - 0926-6690
VL - 162
JO - Industrial Crops and Products
JF - Industrial Crops and Products
M1 - 113236
ER -