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

被引：0
|
作者：
Ding C. [1 ]
Pan M. [1 ]
Yang S. [1 ]
Mei C. [1 ]
机构：
[1] College of Materials Science and Engineering, Nanjing Forestry University, Nanjing
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2020年 / 37卷 / 09期
关键词：
Composites; Digital image correlation; Flame retardancy; High density polyethylene; Strain transmission; Wood fiber;
D O I：
10.13801/j.cnki.fhclxb.20200122.001
中图分类号：
学科分类号：
摘要：
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. © 2020, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
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页码：2173 / 2182
页数：9
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