In the traditional resonance beam method for measuring material damping, the base layer damping is usually neglected to cause some errors more or less. In order to theoretically estimate the error, a formula was then derived here based on the complex stiffness theory. By using this formula, the effects of some main factors on the error were carefully analyzed. Steel and organic glass were taken as base layers, respectively to measure the loss factor of urethane rubber. The analysis results were verified with tests. The test results agreed well with those of the theoretical analysis. It was shown that if material damping is measured with the resonance beam method, due to ignoring the base layer damping, a larger error can be caused; loss factor ratio, modulus one and thickness one of damping layer to base layer are three main factors, the smaller the three factors, the larger the error; the effects of modulus ratio and thickness one can be reflected with the flexural stiffness ratio of a composite beam to a base beam, the smaller the flexural stiffness ratio, the bigger the error; for steel base layer, if the loss factor of the damping layer exceeds 0.1 and the flexural stiffness ratio exceeds 1.1, the base layer damping can be neglected; for organic glass base layer, the base layer damping cannot be neglected.
屈忠鹏 盛美萍. 共振梁法测量材料阻尼适用性的理论与试验研究[J]. 振动与冲击, 2018, 37(11): 225-229.
QU Zhong-peng SHENG Mei-ping. Theory and tests for applicability of material damping measured with resonance beam method. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(11): 225-229.
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