Embedment
Properties:
The
embedment characteristics of the wood medium
around a fastener must be obtained by a test in
which the medium is uniformly pressed. Normally
this is not possible, as the fastener would also
bend. The program HYST has been used within a
material characterization program (EMFIT) to extract the
embedment characteristics. The first of the
following figures shows an experimental
force/displacement curve and the second the fit
obtained using HYST with the identified embedment
parameters.
The
form of the embedment equation is as implemented
in HYST.
A
comprehensive testing program has been completed
to catalogue embedment characteristics for two
types of nails (spiral, Common) and different
combinations of lumber (SPF, Hemlock, Douglas fir)
and Oriented Strand Board, Plywood and Gypsum
boards.
Additional
information on EMFIT can be found in:
Foschi,
R.O., Yao, F., and Rogerson, D. 2000. "Determining
Embedment Response Parameters from Connector Tests
", Proceedings,
World Timber Engineering Conference, Whistler,
B.C. Canada, July 31-August 4, 2000.
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