Patent ID: 6672141
Filing Date: 2004-01-06
Classification: G01N

Abstract:
A viscoelastic characteristic value-measuring apparatus having an input bar and an output bar arranged in a straight line to put a specimen therebetween; first and second strain gauges installed on said input bar: and third and fourth strain gauges installed on said output bar,wherein said first and second strain gauges measure an incident strain wave and a reflected strain wave generated on said input bar when a front end of said input bar is hit, and said third and fourth strain gauges measure a transmitted strain wave transmitted from said input bar to said output bar through said specimen; and a length of said input bar is set to not less than 1000 mm nor more than 2500 mm; a length of said output bar is set to not less than 700 mm nor more than 2200 mm; and a propagation speed of a strain in said input bar and said output bar is set to not less than 1200 m/s nor more than 1800 m/s, and is set to be a small difference between the propagation speed of the strain in the input bar and the output bar and that of the strain in the specimen, in order to measure correctly a third reflected strain wave which is reflected from the rear end of the specimen to the front end of the input bar, preventing the third reflected strain waves and a second reflected strain wave which is reflected again from the front end of the input bar to the rear end of the input bar from interfering with each other.