An original impact device for biomass characterisation: results obtained for spruce and poplar at different moisture contents

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• 作者：Floran Pierre (1)
  Giana Almeida (2) (3)
  Fran?oise Huber (4)
  Philippe Jacquin (4)
  Patrick Perré (1)
  
• 刊名：Wood Science and Technology
• 出版年：2013
• 出版时间：May 2013
• 年：2013
• 卷：47
• 期：3
• 页码：537-555
• 全文大小：1061KB
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• 作者单位：Floran Pierre (1)
  Giana Almeida (2) (3)
  Fran?oise Huber (4)
  Philippe Jacquin (4)
  Patrick Perré (1)
  
  1. LGPM, Ecole Centrale Paris, Grande Voie des Vignes, 92 290, Chatenay-Malabry, France
  2. UMR 1145 Ingénierie Procédés Aliments, AgroParisTech, 1 avenue des Olympiades, 91300, Massy, France
  3. UMR 1145 Ingénierie Procédés Aliments, INRA, 1 avenue des Olympiades, 91300, Massy, France
  4. UMR 1092, LERFoB Bois Biomateriaux Biomasse Team, INRA, Nancy, France
  
• ISSN：1432-5225

文摘

This paper describes an experimental device designed to determine the mechanical behaviour of lignocellulosic products subjected to high strain rates. This impact system consists of a moving trolley equipped with an accelerometer, which is thrown against a fixed trolley. The sample is attached to the fixed trolley, and the accelerations of both trolleys during the impact are analysed to obtain stress/strain curves. A high-speed camera synchronised with a high-powered xenon flash records up to 4,000 frames/s. A set of tests on wood samples is described to illustrate the potential of this new device. In particular, the cross-effects of compression rate and moisture content were demonstrated by performing both quasi-static (1?mm?min? using a conventional testing machine) and dynamic tests (1.7?m?s? using the impact device). Poplar and spruce samples, equilibrated at three different moisture contents (air-dried, fibre saturation point (FSP) and fully saturated), were tested. Two findings are particularly worthy of mentioning: (1) despite the plasticising role of water, the sample at FSP exhibited a fragile behaviour at the high compression rate, (2) the resistance due to the expulsion of water out of saturated samples can be assessed only by performing an impact test.