| Popis: |
Creep is one of the prominent failures of industrial components particularly under continuous loading conditions, elevated temperatures and material diversities etc. In this work, a user defined *CREEP subroutine has been developed and implemented in the commercial finite element code of ABAQUS®, employing the time hardening formulation of Norton-Bailey power law, to numerically simulate the failure due to creep under compression, in carbon fibre reinforced plastic CFRP composites. As such a circular stacked carbon fibre disc CSCFD has been taken from the works of Scattina et al 2015 Compos. Struct. 134, 378–383. Along with creep behaviour data, corresponding to 30 MPa, 40 MPa and 50 MPa loads, from which time-hardening formulation of Norton-Bailey law was formulated. Sensitivity analyses were performed on the parameters of this time-hardening formulation, revealing the optimised parameters corresponding to the composite material. These parameters were implemented in ABAQUS® for the simulation of creep which revealed time interval discrepancy between the *STATIC and *VISCO steps. This led to the development of a user-defined *CREEP subroutine along with orthotropic material formulations which successfully incorporated this discrepancy. The results, so obtained from the subroutine, are in excellent agreement with the reported experimental data in Scattina et al 2015 Compos. Struct. 134, 378–383, thus validating the numerical model and the developed subroutine making it possible to understand the creep behaviour in these materials. |
