2 June 1999 Directional damping material for integrally damped composite plates
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Abstract
Current viscoelastic-damping materials behave isotopically so that their stiffness and damping properties are the same in all directions. There is a desire to develop viscoelastic- damping materials that behave orthotropically so that the stiffness and damping properties vary with material orientation. These damping materials can be made othrotropic by embedding rows of thin wires within the viscoelastic damping material. These wires add significant directional stiffness and strength to the damping materials, where the stiffness and strength variation with wire orientation follows classical lamination theory. The presence of these wires introduce different damping mechanisms (longitudinal, transverse, and longitudinal shear damping coefficients) that depend upon mode type and orientation angle. Results from experimental studies show that the magnitude of the loss factor and shear modulus depends upon the mode type and orientation angle of these wires within the damping material. The in-plane axial mode loss factor is highly dependent upon the longitudinal coefficient for (0 degrees) wire orientation, the transverse coefficient for (90 degree) wire orientation, and the longitudinal shear-damping coefficient for all other off-angle wire orientations. The loss factor for the out-of- plane bending and torsion modes is highly dependent upon all three damping coefficients.
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Janet M. Biggerstaff, John B. Kosmatka, "Directional damping material for integrally damped composite plates", Proc. SPIE 3672, Smart Structures and Materials 1999: Passive Damping and Isolation, (2 June 1999); doi: 10.1117/12.349799; https://doi.org/10.1117/12.349799
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