Service life prediction of solid rocket propellants considering random thermal environments

Yılmaz, Okan
Kuran, Bayındır
Özgen, Gökhan Osman


Service life assessment of solid rocket propellants considering random thermal and vibratory loads
Yılmaz, Okan; Özgen, Gökhan Osman; Kuran, Bayındır; Department of Mechanical Engineering (2012)
In this study, a detailed service life assessment procedure for solid propellant rockets under random environmental temperature and transportation loads is introduced. During storage and deployment of rocket motors, uncontrolled thermal environments and random vibratory loads due to transportation induce random stresses and strains in the propellant which provoke mechanical damage. In addition, structural capability degrades due to environmental conditions and induced stresses and strains as well as materia...
Service life estimation of extrusion dies by numerical simulation of fatigue-crack-growth
Sonsoz, A; Tekkaya, E (1996-05-01)
In this study, fatigue behavior of cold extrusion dies is investigated analytically. Experimental studies and practical experience have shown that fatigue cracks occur at the inlet radius of die shoulders. The highest stress concentration is found also at the same location. For this reason, effective stress intensity factors at different locations of the die-shoulder inlet of a typical axisymmetric extrusion die have been calculated by using the finite element method. The crack growth has been simulated by ...
Service models for airline revenue management problems
Eroğlu, Fatma Esra; Avşar, Zeynep Müge; Department of Industrial Engineering (2011)
In this thesis, the seat inventory control problem is studied for airlines from the perspective of a risk-averse decision maker. There are only a few studies in the revenue management literature that consider the risk factor. Most of the studies aim at finding the optimal seat allocations while maximizing the expected revenue and do not take the variability of the revenue and hence a risk measure into account. This study aims to decrease the variance of the revenue by increasing the capacity utilization cal...
Storage reliability analysis of solid rocket propellants
Hasanoğlu, Mehmet Sinan; Dağ, Serkan; Department of Mechanical Engineering (2008)
Solid propellant rocket motor is the primary propulsion technology used for short and medium range missiles. It is also commonly used as boost motor in many di_erent applications. Its wide spread usage gives rise to diversity of environments in which it is handled and stored. Ability to predict the storage life of solid propellants plays an important role in the design and selection of correct protective environments. In this study a methodology for the prediction of solid propellant storage life using cumu...
Performance characteristics of a cold gas thruster with real gas effects
Özden, Aysu; Aksel, M. Haluk.; Department of Mechanical Engineering (2019)
Cold gas propulsion systems are mainly used for attitude control purposes for space applications since 1960s due to their advantages in cost effectiveness, simplicity, availability, etc. It is important to investigate transient behavior of the thruster of these systems since they operate in a very short period of time, in the order of milliseconds. Both depressurization of the tank and expansion of thrusters to the vacuum, in order to obtain optimum performance in space, result into obtaining low temperatur...
Citation Formats
O. Yılmaz, B. Kuran, and G. O. Özgen, “Service life prediction of solid rocket propellants considering random thermal environments,” presented at the 6th Ankara International Aerospace Conference, Ankara, Türkiye, 2011, Accessed: 00, 2022. [Online]. Available: