RT - Journal Article T1 - روش‌های جدید در ارزیابی و پیش‌بینی کهولت پیشرانه‌های جامد مرکب JF - isaem YR - 2017 JO - isaem VO - 13 IS - 1 UR - http://isaem.ir/article-1-1167-en.html SP - 15 EP - 22 K1 - Aging K1 - composite solid propellant K1 - Properties assessment K1 - ballistic properties K1 - spectroscopy K1 - dilatation AB - In order to aging study of the compsite solid propellants, usually the changes in propellant properties during warehousing and storage are measured, and then the shelf life of them estimated. In this regard, by applying the common methods based on mechanical tests, chemical and thermal analysis, the propellant properties due to aging and time lapse are measured. In this paper, first we remark to conventional methods such as stress/strain test, and differential scanning calorimetery, differential thermal analysis and thermogravimetric analysis, and then some of new methods and tests including NMR and IR spectroscopy, determination the amount of dilatation, oxygen consumption, the sensitivity (BAM test), crack growth rate, ballistic properties, and microscopic study are presented that by applying these tests, it is possible to measure the changes of propellant properties over the time and realized the aging of compsite solid propellants and predicting their shelf life. LA eng UL http://isaem.ir/article-1-1167-en.html M3 ER -