Abstract
Molten marks on electric plugs or wall sockets found in fire sites often are great help, when we investigate the cause of the fires. It is known that the distance between each second arm of crystals called DAS (Dendrite Arm Spacing), that we see on the cross section of those molten marks, change depending on the atmospheric temperature at the time of a short circuit. Also it is already known that DAS between primary and secondary marks are clearly different. We created reference data to make use of DAS for practical investigation. In this study, we showed the relation between atmospheric temperature and DAS by making samples of molten marks at various temperatures. And we examined if this method was able to help assume the surrounding temperature at the time when the molten mark was produced. As a result, we found that the method has some possibility.
We developed a new method for assuming the atmospheric temperature at the time of the short circuit using the reference data.
