Abstract
A modal damping formula is developed analytically for free hanging homogeneous pipes for which material damping is the only source of the structural damping. The relationship between the material loss factor and the modal loss factors of a structure is obtained by using a hysteretic material damping model. Key parameters determining the modal damping values are identified. The theory presented satisfactorily explains some well known damping behaviours of pipe-like structures. Tests results on seven model scale free hanging PVC pipes of different lengths and cross-sections are presented. The effects of temperature and mode shapes are examined. The agreement with the theory presented is good.
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