Rolf Lammering
Helmut Schmidt University, Mechanical Engineering, Faculty Member
Research Interests: Mechanical Engineering, Civil Engineering, Image Processing, Experimental Mechanics, Localization, and 9 moreSpeckle interferometry, Lamb wave, Discontinuity, Lamb waves, Wave propagation, Interdisciplinary Engineering, Surface Wave, Electronic Speckle Pattern Interferometry, and Optical interferometry
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... more
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.