Damping properties of sintered high-porosity materials based on powders and discrete copper fibers

Abstract

621.762Experimental relationships are established between the vibration decrement and the level of maximum cyclical deformations during the bending of sintered high-porosity materials based on powders and discrete copper fibers. The quality of interparticle contacts is evaluated in the sintered materials. Comparison of curves of the vibration decrement versus porosity for fixed maximum cyclical deformations indicated that the vibration decrement of all materials decreases with increasing porosity (within the range from 40 to 77%); however, it is appreciably greater vibration decrement of the matrix material (compact copper). Sintered high-porosity materials based on discrete copper fibers have the highest indicators of energy dispersion, especially at relatively high levels of maximum cyclical deformations as compared with sintered materials based on copper powders.