A similarity rule of the draped figures for sheets was investigated by using a model of the F.R. L.drape test. We assumed that the relation between own-weight and the resistant forces could be expressed by the following equation:
P
w=P
1+P
2+P
3where,
Pw : own-weight of the sheet,
P
1 : resistant force against the bending,
P
2 : resistant force against the compression,
P
3: other resistant forces.
In this paper, we devised a joint model as both P
1and P
2among the above three forces acted at the same time on the draped sheets, and the similarity rules of the draped figures for sheets were examined by using the joint model. Results obtained were as follows:
1) It was shown quantitatively that the major mechanical component forming the draped figures for sheets was the bending length,
i.e., Peirce's
cof the F.R.L. drape test.
2) A similarity condition for draped figures was obtained on the joint models constructed from different sheets, and a boundary condition for the equal deformation rate was obtained on the deformation caused by the P
3.
3) A possibility was shown that the components of the P
3could be analyzed from this mode.
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