Abstract

The internal-damping effects of varying composition, heat-treatment, cold work, magnetic-field strength, stress history, and static tension stress have been studied at room temperature using fixed-fixed beam specimens supported in a new bending vibration-decay apparatus. Experimental logarithmic decrements are converted to specific damping energies by a straightforward numerical method; such information is needed to extend a fundamental understanding of the physical nature of damping and to provide useful engineering-design data. Changing hardness from 225 to 388 Bhn was found to cause a wider variation in AISI 403 specimen damping than the application of a static tension stress or d-c magnetic field. Even at relatively low vibration stresses, considerable energy dissipation originates from microscopic plastic flow in soft materials.

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