Ultrasonic Testing
Ultrasonic testing can be used to determine the average properties of sample particles. Sound waves are transmitted through the sample and a sound signal is received representative of sound waves transmitted through the sample. This wave is compared the reference data to determine, independently of particle size of particles the average properties of the particles constituting the sample. The sample may be a powder or an aggregate such asgranules, pellets or briquettes.
Preferably, the method includes determining particle strength based on measured sound velocity independently of particle size. More particularly, the method may include calculating the Young's modulus of the particles, and from this calculation determining the particle strength. The Young's modulus of the particles may be obtained from an equation derived from a random packing order of spheres. (RDC 6/30/2011) (Coghill, US Patent 7,856,881; 12/28/2010)
Mechanical Properties
Ultrasound /Ultrasonics
Recent US Patents
12/28/2010
7,856,881
Determining average mechanical properties of constituent particles of a sample of material using ultrasound
Coghill, Australia, determined the average strength or Young's modulus of the constituent particles of a sample from the measured speed of sound propagated from a source through the sample to a receiver. Other sample data, such as the porosity, Poisson's ratio and the pressure applied to the sample, are also used in the determination. However, no data pertaining to individual particle sizes is required. The method provides a non-destructive test for the average strengths of materials such as iron ore pellets, alumina powder, silica flour, and coal dust. (RDC 6/29/2011)