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Non-destructive method to follow ageing of solid propellant in rocket motors

: Mußbach, Günter

Volltext urn:nbn:de:0011-n-3497848 (313 KByte PDF)
MD5 Fingerprint: 274b29b3acbcb1b43ce2a26a2e03968d
Erstellt am: 30.7.2015

Fraunhofer-Institut für Chemische Technologie -ICT-, Pfinztal:
Energetic materials - performance, safety and system applications : 46th International Annual Conference of the Fraunhofer ICT, June 23 - 26, 2015, Karlsruhe, Germany
Pfinztal: Fraunhofer ICT, 2015
ISSN: 2194-4903
Fraunhofer-Institut für Chemische Technologie (International Annual Conference) <46, 2015, Karlsruhe>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ICT ()

In all case-bonded composite rocket propellant (CRP) types and in all case-bonded elastomerbonded high explosive charges (HEC) so-named bondline stresses occur when the temperature is unequal to the so-named stress free temperature. The stresses or the forces, which act as tensile force on the bondline when temperature is decreased, can cause de-bonding from the case. Further on, the occurring tangential or ring stresses inside the material can lead to cracks inside the material, especially when the strain capability is not sufficient or decreases with ageing. Therefore a method was developed to monitor such stresses. The method enables a prediction tool for critical loads with respect to failure of the material. Thismethod works nondestructively, means the quantities were determined without destruction or firing of the munitions, here rockets and high explosive warheads. In a first step, built-in stress sensors are used to follow the development of stress values during ageing and thermal cycling. The material is a typical composite rocket propellant with elastomeric HTPB-IPDI binder and AP plus Al as solid fillers. The experimental setup consisting of several small rocket motors equipped with stress sensors is explained. Results of the measurements are presented and discussed. Again to say any other elastomeric binder with any other solid filler load are composite materials which suffer from the mechanisms outlined.