The dual integrated force method applied to unidirectional composites
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Date
2014-04-07Author
Adarraga Usabiaga, María Iciar
Romera Aguayo, Jesús María
Mujika Garitano, Faustino
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International Journal for Numerical Methods in Engineering 98(9) : 663-677 (2014)
Abstract
This paper shows the use of the dual integrated force method (IFMD) in finite elements method and its application to composite materials. This method was developed by S.N. Patnaik in isotropic materials, considering not only the equilibrium equations but also the compatibility conditions. In the IFMD, the principal unknowns are the displacements, and the structure of governing equation is similar to the stiffness method. It is shown that the governing equation of the IFMD is the same than in the case of the hybrid method of Pian. The method is applied to two examples, a cantilever beam of orthotropic material loaded at the end and one off-axis tensile test in a unidirectional composite specimen. The results of this method have been compared with the ones obtained from the application of the stiffness method and with analytical results.