Abstract
In the present work a new damage model based on continuum damage mechanic was proposed to predict the nonlinear behavior of woven glass fiber composite under tensile test. The composite specimens were fabricated by hand lay-up method and they were put into a temperature and pressure controlled curing chamber. In order to perform the tensile test a universal Instron machine was used with the DIC method to measure the strain field during the tensile test. All orthotropic mechanical properties such as elasticity modulus, Poisson`s ratio and failure strain were calculated from experiment. After tensile test it was observed that the material behavior was brittle elastic however the stress-strain curve was exhibited a nonlinear fashion. The reason of nonlinearity assumed as irreversible damage effect during the test for instance initial void, fiber breakage, matrix cracking, delamination and fibers debonding. A new damage model with four physical meaning constants was proposed to predict the nonlinear behavior of the material. The model was implemented by a user subroutine in MSC MARC finite element software. Additionally the material damage constants were obtained from iterative numerical simulations. Moreover the damage parameters were optimized by Genetic Algorithm. In conclusion the damage model can predict the nonlinear behavior of composite in both warp and weft direction with reasonable agreement in comparing with experiment.
Highlights
The utilization of composites has grown over the years due to the superior physical and mechanical properties
Hu and Zhang derived a meso-model based on continuum damage mechanics for both intraply and interply progressive failure behaviors of a 2D woven-fabric composite laminate under a low velocity impact
By assuming the power law model defined by equation (3) for damage evolution and using an optimization technique to find the material constants of the model, two sets of damage parameters were obtained
Summary
The utilization of composites has grown over the years due to the superior physical and mechanical properties. Hu and Zhang derived a meso-model based on continuum damage mechanics for both intraply and interply progressive failure behaviors of a 2D woven-fabric composite laminate under a low velocity impact. Mi et al described a progressive failure criterion for the mixed-mode delamination of fiber reinforced composites, based on the cohesive interface element in conjunction with softening relationships between stresses and relative displacements. The CDM method has been employed to introduce a model to estimate the progressive failure of a composite laminate and predict the nonlinear behavior in tensile test. This method can predict the initiation, propagation, and final failure of composite structures effectively. The epoxy enjoys many excellent properties such as low viscosity, high temperature resistance and excellent mechanical and dynamic properties after ambient cure [6]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
