000004627 001__ 4627 000004627 005__ 20141119144539.0 000004627 04107 $$aeng 000004627 046__ $$k2002-06-02 000004627 100__ $$aTesta, Rene B. 000004627 24500 $$aMODELING CRACK CLOSURE EFFECTS ON FREQUENCY AND DAMPING 000004627 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference 000004627 260__ $$bColumbia University in the City of New York 000004627 506__ $$arestricted 000004627 520__ $$2eng$$aBecause vibration signatures can be used to identify the presence of fatigue cracks and assist in locating damage, it is important to understand how cracks affect modal frequencies and damping. Experimental results are presented here to show how the effect of a crack depends on the crack history and the degree of crack closure. Nonlinear effects are demonstrated. Modeling of the mechanism by which the crack interfaces affect frequency and damping is outlined. 000004627 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000004627 653__ $$acrack closure, modeling, frequency, damping. 000004627 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002 000004627 720__ $$aTesta, Rene B.$$iZhang, Wuzhen 000004627 8560_ $$ffischerc@itam.cas.cz 000004627 8564_ $$s92582$$uhttps://invenio.itam.cas.cz/record/4627/files/082.pdf$$yOriginal version of the author's contribution as presented on CD, . 000004627 962__ $$r4594 000004627 980__ $$aPAPER