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. Author manuscript; available in PMC: 2012 Jan 11.
Published in final edited form as: J Biomech. 2010 Oct 30;44(2):228–234. doi: 10.1016/j.jbiomech.2010.10.020

Figure 3.

Figure 3

The mechanical behaviors in pure tension (0°) and pure shear (90°) of the micro FEA-model (in grey) and the four different cases. Note that only the responses in pure tension and pure shear are presented and not the mixed mode responses. In pure tension, the micro FEA-models resulted in a linear increase of TN followed by yielding and softening. In pure shear, a linear increase of TT was found without any softening. Case I and II were modeled as a constant stiffness in tension and shear in which Case I was assumed to be infinitely stiff. Case III had a similar behavior as has been found in experiments: yielding and softening in tension and shear with a equal stiffness in tension as in shear (Mann et al., 2008; Mann et al., 1999). Case IV had the same mixed mode behavior as the micro FEA-models. For Case III and IV, the parameters of the cohesive model were set according to the interfacial strength (TN and TT) and its corresponding displacement (δN and δT) (Table 3).