25 August 2009 Mechanical behaviors of molded pulp material
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Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73756D (2009) https://doi.org/10.1117/12.839376
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China
Abstract
Many mechanical phenomena of interest for web-like materials, such as molded pulp, take place at the micro-scale. A SEM (scanning electron microscope) with SHIMADZU electrohydraulic servo experimental system was employed to study the micro-scale mechanical behavior of molded pulp materials. Uniaxial tension tests of molded pulp specimens were carried out, resulting in the stress-strain curves. Experimental results indicated that the material is not only elasticplastic, but also emplastic. The surface morphology evolution of the tensile specimen was visually monitored during the process of loading, and some SEM micrographs were captured under different load levels. Full-field deformations over an area of 190x170 μm2 were obtained using the digital image correlation method. The higher strains occurred at the fibre fines zone or around voids whereas the lower strains were obviously found at long fibres, demonstrating that the strain distribution is obviously uneven. The reason may be due to the random orientation and the fraction of the fibres, and the presence of impurities and voids as well.
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Hongwei Ji, Huaiwen Wang, Jinlong Chen, "Mechanical behaviors of molded pulp material", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73756D (25 August 2009); doi: 10.1117/12.839376; https://doi.org/10.1117/12.839376
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