A strain rate and temperature dependent criterion to describe the linear - non linear behaviour’s transition of organic matrix composite materials in shear: Application to T700GC/M21

Abstract

The organic matrix composites (OMC) are widely used in aeronautical industry. The mechanical behaviour of these materials is known to be strain rate and temperature dependent. Therefore it is necessary to take the influence of temperature and strain rate into account in the behaviour models. The mechanical behaviour of OMC can be split into two different parts: a first linear and a second non linear phasis. To predict the evolution of the mechanical behaviour, it is important to evaluate the transition between linear and non linear behaviour with respect to the influence of the strain rate and the temperature. For this purpose, different strain rate and temperature dependent failure criteria and yield stress criteria, available in the literature were considered. These criteria were compared to the experimental results obtained in previous works [1]. Finally a strain rate and temperature dependent criterion was proposed to describe more accurately this transition evolution.

Study on X-ray Induced Two-Dimensional Thermal Shock Waves in Carbon/Phenolic

“…The basic form of the average positive stress at the stage of elastic deformation is shown below: (4) In order to make the expression of average normal stress reflect the nonlinear effect of volume change and the anisotropic characteristics of the material, a modified equation of state can be introduced for calculation [19]. Since the X-ray irradiation process not only describes the shock compression state with relatively low temperature but also deals with the state formed by the coupling of X-ray energy deposition and hydrodynamic motion, this work uses the PUFF Equations ( 5) and ( 6) of state to describe the specific form [20,21].…”