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Investigation of Dynamic Behavior of Unidirectional Plies Using One Parameter Plastic Model
Behnam Davoodi1*, Ashkan Mahmoud Aghdami
1- Faculty of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran 2- Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
P.O.B. 16765-163 Tehran, Iran, [email protected]
ARTICLEINFORMATION ABSTRACT
Original Research Paper Received 05 January 2015 Accepted 11 March 2015 Available Online 18 April 2015
In this article constitutive equations on dynamic behavior of off-axis polymer matrix composites in different strain rates were investigated. Using the Hill Anisotropy and assumptions governing fiber composites, model was developed to express the dynamic behavior of polymer matrix composites. Using the flow rules and effective stress and assumptions in fiber composites like non plastic behavior of composites in fiber direction, the Hill parameters were omitted and reduced to one parameter namely, This model was called2D one-Parameter Plastic Model (also it can be developed for 3D composite layers). This model was developed for off axis composites as well. For each composite with different fiber directions, effective stress- effective strain was introduced. By choosing the right value for parameter by trial aand error, all the stress-strain curves were collapsed into one single curve. Using this model and the experimental static and quasi- static results gathered from different authors (in range of0.01s ) viscoplastic model was obtained which can predict the polymer composite response both in static and high strain rate tests (between 400s and 700s ). Constant parameters in high strain rates in this model were calculated through extrapolating the data in the static test range. The accuracy of this model was investigated and approved by Split Hopkinson Pressure Bar test. The results showed that the visco plastic model can predict the dynamic response of composite fibers in high strain rates very well.
Keywords:
Dynamic behavior Constitutive equations
Split Hopkinson Pressure Bar test Viscoplasticity
High strain rate
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