Patent ID: 6792812
Filing Date: 2004-09-21
Classification: G01N

Abstract:
A method for layered structure breaking strength estimation, comprising:inserting an edge of a cutting blade into an upper layer of the structure, moving the cutting blade substantially in parallel with an interface between the upper layer and a lower layer of the structure while automatically controlling a depth of the cutting blade to a depth slightly higher than the interface, the step of moving the cutting blade while automatically controlling the depth of the cutting blade comprises mounting the cutting blade on a longitudinal slide way, moving the longitudinal slide way in a direction vertical to the interface by means of a longitudinal ball screw and coupling a motor to the longitudinal ball screw to enable automatic control of the movement of the cutting blade in the direction vertical to the interface and thus the depth of the cutting blade, and measuring a force exerted on the cutting blade substantially in parallel with the interface.