Interfacial mechanical behavior of wood fiber/high density polyethylene composites based on digital image correlation

DING Chunxiang; PAN Mingzhu; YANG Shuxin; MEI Changtong

doi:10.13801/j.cnki.fhclxb.20200122.001

Volume 37 Issue 9

Sep. 2020

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DING Chunxiang, PAN Mingzhu, YANG Shuxin, et al. Interfacial mechanical behavior of wood fiber/high density polyethylene composites based on digital image correlation[J]. Acta Materiae Compositae Sinica, 2020, 37(9): 2173-2182. doi: 10.13801/j.cnki.fhclxb.20200122.001

Citation:

DING Chunxiang, PAN Mingzhu, YANG Shuxin, et al. Interfacial mechanical behavior of wood fiber/high density polyethylene composites based on digital image correlation[J]. Acta Materiae Compositae Sinica, 2020, 37(9): 2173-2182. doi: 10.13801/j.cnki.fhclxb.20200122.001

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Interfacial mechanical behavior of wood fiber/high density polyethylene composites based on digital image correlation

doi: 10.13801/j.cnki.fhclxb.20200122.001

College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China

Received Date: 2019-10-16
Accepted Date: 2019-12-18

Available Online: 2020-01-22

Publish Date: 2020-09-15

Abstract

Abstract

The interfacial strain of wood fiber/high density polyethylene(WF/HDPE) composites was studied. Digital image correlation(DIC) was used to investigate the effects of WF mass fraction (10wt%–40wt%) and modified ammonium polyphosphate(mAPP) flame retardant mass fraction (10wt%–25wt%) on the strain distribution and transmission evolution of WF/HDPE composites. The mechanical properties and interfacial bonding of WF/HDPE composites were analyzed by mechanical tests and SEM, respectively. With WF mass fraction rising from 10wt% to 30wt%, the strain transfers stably and uniformly from both ends to the axial center of the WF/HDPE composite. When the WF amount reaches 30wt%, the high strain transfers within 1/2 region of WF/HDPE composite and its tensile strength and impact strength are 21.5 MPa and 10.22 kJ/m², respectively. However, when WF mass fraction is 40wt%, the stress concentration occurs at tensile bearing end of the WF/HDPE composite, and prevents uniform transmission of strain in WF/HDPE composites. mAPP exacerbates debonding and impedes mechanical meshing between WF and HDPE. As WF mass fraction increases from 10wt% to 25wt%, several scattered high strain regions appear and the full-field strain transfers irregularly. When the WF mass fraction reaches 25wt%, the strain distribution of WF/HDPE composite becomes polarized, resulting in a decrease of the tensile strength and impact strength to 15.5 MPa and 5.49 kJ/m², respectively.
- wood fiber,
- high density polyethylene,
- composites,
- flame retardancy,
- digital image correlation,
- strain transmission
Long Abstrsct
Innovation Points

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References(32)

References

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