In general, statics has been used for analyzing a fracture. The author has described thermodynamic analyses of a non-1inear fracture phenomenon, but different points of a static analysis and a thermodynamic analysis have never been examined. First, the phenomenon of a non-linear fracture is analyzed with statics and thermodynamics in this report. Secondly, the results of a thermodynamic analysis are compared with the results of a static analysis. Thirdly, the difference of the results becomes made to clear. The conclusions are as follows. (1) It is possible to analyze thermodynamic stable situations with statics, but impossible to do unstable situations with statics. (2) The results of a thermodynamic analysis do not deny the results of a static analysis. (3) Even if the results of a static analysis and a thermodynamic analysis coexist, it is not irrational. (4) Limitation of static analysis is caused by the laws of composing statics and thermodynamics.
