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| - A Micro Tensile-testing Method for Single Wood Fiber in a Scanning Electron Miroscope
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| - A tensile test apparatus was divised in order to observe both load-elongation and fracture processes of a single wood fiber during strain in scanning electron microscope (JSM-U3) which is equipped with a quick scan device and a video tape recorder. The wood chips of SUGI (Cryptomeria japonica D. Don) were delignified using sodium chlorite solution. Each tracheid pulled out from the delignified chips was freeze-dried and mounted on a thin aluminum tab before observing in the specimen chamber of the SEM. The obtained values of breaking load of the single trachelds are comparable to those obtained by standard test in air-dried state, but the ultimate elongation is considerably smaller. In the first stage of fracture process the crack was always initiated at the bordered pit of the tracheld, which propagated perpendicular to the tracheid axis, and finally the tracheld wall was splitted. By examining the broken end of the tracheid wall it was also found that the initially fractured surface which accompanied the scission of fibrils was very smooth and splintery surface was formed at the end of the fracture process.
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