LOW VELOCITY HIGHLY ANISOTROPIC ELASTIC MATERIALS

摘要

This invention discloses a class of materials having a cellular structure which is suitable to slow the movement or velocity of elastic waves therein. An example of this class of materials is a cellular phenolic honeycomb polymer in which an elastic wave has a delay time of 0.6 milliseconds per inch in contrast to a delay time of 0.005 milliseconds per inch obtained in quartz, the most widely used prior art material. By proper modification of the cellular structure parameters, that is, the thickness of the individual cell wall and the dimensions of the individual cell, a particular desired elastic wave velocity in a given direction can be obtained.