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| THE IMPACT COMPRESSIVE LOADING RESPONSE OF CHINESE WHITE POPLAR: EXPERIMENT AND ANALYSIS |
| Liu Yunchuan1,2,3 Wang Xuguang2 Dou Jinlong1,2 |
| 1. University of Science and Technology Beijing , Beijing 100083; 2. Beijing General Research Institute of Mining and Metallurgy, Beijing 100044; 3. Hebei Polytechnic University, Tangshan 063009 |
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Abstract Dynamic response of the Chinese white poplar is investigated using modified Kolsky (split Hopkinson pressure) bars. Analysis based on the elementary one-dimensional wave theory indicates that the stress uniformity in specimens tested dynamically by the SHPB method can be achieved notwithstanding the lower mechanical impedance of woods, no additional incident-pulse shaping technique is required as usually proposed for soft materials. The dynamic data are discussed and compared to those of quasi-static experiments. Results show that the Chinese white poplar has typical properties of all cellular solids. Concerning the longitudinal samples, both the initial failure strength and the plateau (crushing) stress are sensitive to the strain rate, while the degree of the plateau stress enhancement is lower compared with the former. For the tangential samples have no distinct initial failure stress, the plateau stress is regarded as the initial failure stress. It is shown that the plateau stress is very sensitive to the loading rate. The effect of strain rate on the initial failure stress of Chinese poplar wood has the logarithm law exponent.
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Received: 13 June 2008
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2009, Vol. 28 
