Engineering Transactions, 64, 4, pp. 597–604, 2016

Nonlinear Elastic Waves for Evaluation of Composite Material Deterioration

Rolf LAMMERING
Helmut-Schmidt-University / University of the Federal Armed Forces Germany
Germany

Natalie RAUTER
Helmut-Schmidt-University / University of the Federal Armed Forces Germany

This work deals with numerical investigations on nonlinear wave propagation in order to detect micro-damage in composite material. For this purpose two models are under consideration. First, a wave guide with linear-elastic material behavior with and without a crack is analyzed. The nonlinearity of this model is due to the strain tensor as well as the contact of the crack surfaces. Secondly, a hyper-elastic waveguide with a nonlinear constitutive description is considered. It is shown, that the nonlinearity gives rise to second harmonic wave modes which which may be considered as an indicator of micro-damage and material deterioration.
Keywords: nonlinear elastic waves; material deterioration; hyper-elasticity
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