Scratch Testing Indenter for Complex Surface Contours
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Solution Overview
Problem
Existing scratch testing methods are limited to one-dimensional movements along a straight line, failing to adapt to the complex contours and surfaces of test specimens, which restricts the evaluation of adhesive strength and frictional forces.
Innovation Solution
A method and device that allow for a superimposed displacement movement in the X and Y directions, enabling the indenter to traverse two-dimensional or three-dimensional test sections by controlling the measuring table independently in these directions, with sensors aligned in different spatial directions to record forces and adapt to surface contours, allowing for vector addition of frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the indenter moves along a straight line in one spatial direction, then the measurement is simple and the device is easy to operate, but the method cannot adapt to complex surface contours and restricts the evaluation of adhesive strength
Solution Approach 1:
The patent transitions from one-dimensional straight-line movement to two-dimensional curved path movement by adding a Y-direction movement component to the existing X-direction movement. The measuring table is equipped with movement components in both X and Y directions, enabling the indenter to follow complex contours on the test specimen surface while maintaining measurement capability.
2Adaptability or versatility
If the measuring table moves only in one spatial direction, then the control is simple, but the test section cannot be defined on complex surfaces such as shells or drills
Solution Approach 1:
The patent implements dynamic control of the measuring table movement by enabling independent control of both X and Y direction movements. The control system can dynamically adjust the movement paths to accommodate various test section geometries on complex surfaces, allowing flexible definition of test sections on shells, drills, and other non-planar surfaces while maintaining operational control through programmed motion.
3Measurement precision
If sensors are aligned only in the Z-direction, then the measurement is straightforward, but frictional and transverse forces cannot be recorded in the direction of scratching
Solution Approach 1:
The patent extends force measurement from the vertical Z-direction to include horizontal X and Y directions by positioning sensors in multiple spatial orientations. Force sensors are arranged to detect forces in the scratching direction (X-Y plane) as well as perpendicular directions, enabling comprehensive recording of frictional and transverse forces through vector addition of sensor outputs.
Solution Approach 2:
The patent combines multiple sensor measurements by merging force components from different directions into a unified force analysis system. The control system integrates signals from sensors aligned in different spatial directions and performs vector addition to calculate the total frictional force and other mechanical properties, providing comprehensive force measurement capability.
Data Source
AI summary
The invention relates to a method and a measuring device for detecting measurement signals during a penetrating movement of an indenter (14) into a surface of a test specimen (12) or a coating of a test specimen (12), in particular for determining the adhesive strength of the coating on the test specimen (12), in which the test specimen (12) is fixed on a measuring table (18) of a measuring device (11), in which an optical device (16) is used to determine a starting point (92) for a test section (91) on the test specimen (12), in which the starting point (92) of the test specimen (12) is determined by a displacement movement of the measuring table (18), which is actuated by a control system of the measuring device (11), is aligned with the indenter (14), in which the indenter (14) is placed on the starting point (92) of the test specimen (12) by the control system of the measuring device (11) with a displacement movement along the Z-axis, in which the indenter (14) is subjected to a test force acting in the Z-direction up to the end point (93) of the test section (91), in which a superimposed displacement movement of the measuring table (18) in the X-direction and in the Y-direction is controlled at least intermittently, so that the indenter (14) is guided on the test specimen (12) along an at least two-dimensional test section (91), until the end point (93) of the test section (91) is reached, wherein measuring signals are detected by at least two measuring devices (57, 67) during the displacement movement of the indenter (14) along the test section (91), which are aligned differently to the Z-direction and in different spatial directions to the indenter (23).