layeredmodel [ 7 ]. The plastic theory illustrates this behavior by a stress-strain diagram of the materials. Analyzing structures using the elastic method considers that failure occurs if any point reached to the limit stress, hence elastic based design
hypotheses (Leydesdorff 2010b ).
In this study, I develop this three-layeredmodel in empirical terms using aggregated citation relations among scientific journals as networks. Scientific journals are organized in functionally different groups. For