| The objective of this work is to provide an experimental database of the strain distribution in a plane stress situation for a typical paper material that is loaded well beyond the elastic limit. This information should be of interest to any researcher who wishes to test a potential constitutive model for use in modeling the nonlinear short-duration loading of paper material.; The paper material selected for this study is a machine made medium density paper that might be used as a greeting card paper. As such, this paper has a basis weight of 122 g/m2, a density of approximately 676 kg/m3, and exhibits a strongly anisotropic and nonlinear behavior.; The problem that was studied consisted of a tensile strip with a centrally located hole. Loading was carried out for cases of tensile strip with the load axis along the machine direction, the cross machine direction and for the case of the load direction along a 45-degree orientation relative to the machine direction. Several load levels were studied starting at low loads and progressing to loads that were nearly at the breaking point.; In order to investigate how paper behaves when in-plane loading is high enough for nonlinear effects, strain components around the circular hole (especially along lines leading from the hole edge along the longitudinal and lateral axes), were obtained using image correlation analysis.; Some tests were also conducted to determine the strength of the samples with hole. This information is intended for use by researchers working on the development of a strength theory for paper under general conditions of nonuniform, plane-stress loading. |
