Una técnica de ensayo para investigar el comportamiento bajo tensión de materiales representativos de propulsantes

Los propulsantes son materiales energéticos que se utilizan para generar propulsión en cohetes, proyectiles u otros objetos. Una amplia gama de estados y de velocidades de tensión tienen que ser considerados a fin de predecir el comportamiento mecánico de estos materiales sobre sus diversos ciclos vitales. Los materiales propulsantes pueden ser estudiados mediante el uso de materiales representativos (MRP) cuando se estudian en un laboratorio universitario.

Propellants are energetic materials abundantly used to generate the propulsion of rockets, projectiles, or other objects. A wide range of stress-state and strain-rate has to be considered in view of predicting the mechanical behaviour of this material over its different life cycles. Propellant materials are usually studied through the use of propellant representative materials (PRM) when studied in a university laboratory. In the present work an experimental device was developed to investigate the dynamic tensile response of a PRM material. This device is based on the use of a pendulum that is employed to dynamically load the PRM sample on one end. The sample is attached to an instrumented Hopkinson bar on the other end. The data processing of Hopkinson bar point measurements combined to DIC (digital-imagecorrelation) measurements allows the stress and strain levels in the sample to be characterised. Finally these experimental results can be used to enhance the constitutive modelling of PRM materials.

Fuente: https://www.epj-conferences.org