Adiabatic catastrophe

Gruntfest(4i) has introduced an adiabatic catastrophe theory of the temperature rise in fracture. He used a model that made no hypotheses about the microscopic structure of the separation front. 

A topological study ofthe electron transfer in Li + CI2 system and of the three-electron hond created throngh this transfer has been achieved, based on the topological concepts of Bonding Evolntion Theory. Our results suggest that the dual cusp catastrophe characterizes the diahatic surface crossings which are subjacent in the classical adiabatic analysis ofthe overall reaction path. 

Shear localization or banding due to thermal softening does not require truly adiabatic (i.e., no heat flow) conditions. All that is required is a conditiOTi in which enough heating occurs. The term catastrophic thermal shear covers this. 

As far as this section is concerned, thermal aspects of the FRRPP process are of most interest, based on the manner at which it was able to store the exotherm locally and apparently able to release it to temperatures much higher than the adiabatic temperature rise in a coherent fashion (Cases 1-2) or catastrophically (Case 3) in micro-, meso-, and macroscales. The following case studies detail such behavior. 

Peroxide compounds are usually very reactive and flanunable. They have caused many catastrophic accidents around the world because of their reactive potential. Conventional methods to assess risk of such a reactive chemical have been done by experiments with precision machine such as DSC (differential scanning calorimeter), ARC (accelerating rate calorimeter), etc., but they need more finance, concentration and charge of danger. To overcome that, computer aided prediction method using group contribution method was used in this study. Some essential thermodynamic properties of chemicals were evaluated by this method, and then adiabatic temperature rise for each decomposition steps of peroxide compound were obtained, which can be a good index of the hazardousness of reaction. The result was approximate to other experimental and simulation data from references. 

---