Modular Rheometer with Force Compensation for Poisson's Ratio
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Solution Overview
Problem
Current rheometers face challenges in simultaneously measuring multiple parameters with high accuracy and ease of operation, particularly in determining Poisson's ratio, which is influenced by mutual forces between rotation and linear measurements, leading to errors and material inefficiency.
Innovation Solution
A modular rheometer combining rotation and linear dynamic mechanical analysis units with a compensation system that adjusts for mutual forces and torques, allowing simultaneous or consecutive measurements on a single sample, minimizing sample changes and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rotational forces or torques are transmitted via the sample from the measurement shaft to the adjusting rod during linear DM(T)A analysis, then measurement data can be obtained with the linear unit, but the transmitted forces cause measurement errors and reduce accuracy
Solution Approach 1:
The patent extracts and compensates for the disturbing rotational forces transmitted through the sample. A compensation unit is introduced that specifically counteracts the torque transmitted from the measurement shaft to the adjusting rod, separating the useful linear measurement signals from the harmful rotational interference forces.
Solution Approach 2:
The patent introduces a compensation unit as an intermediary element between the measurement shaft and the adjusting rod. This compensation unit acts as a mediator that receives the rotational forces and actively counteracts them, preventing these forces from affecting the linear measurement accuracy while allowing both measurement modes to operate simultaneously.
2Productivity
If multiple measurement units (rotation rheometer and linear DM(T)A analysis unit) are combined in one device, then numerous parameters can be measured on a single probe simultaneously, but the device complexity increases
Solution Approach 1:
The patent merges the rotation rheometer and the linear DM(T)A analysis unit into a single integrated device with a common measurement probe. Both measurement units share the same sample holder and measurement axis, allowing simultaneous measurement of multiple parameters (storage modulus, loss modulus, complex modulus, Poisson's ratio) on a single sample without requiring separate devices or sequential measurements.
Solution Approach 2:
The patent creates a universal measurement probe that can perform both rotational rheological measurements and linear dynamic mechanical analysis. The single probe is designed to accommodate both measurement modes, enabling the device to function as both a rotation rheometer and a linear DM(T)A analyzer, thereby eliminating the need for multiple specialized devices.
3Loss of substance
If simultaneous measurements are performed with rotation rheometer and linear DM(T)A analysis unit, then material consumption is reduced, but mutual forces between units cause measurement errors
Solution Approach 1:
The patent applies preliminary anti-action by introducing a compensation unit that proactively counteracts the mutual forces generated during simultaneous measurements. The compensation unit is designed to detect and counterbalance the forces transmitted through the sample, preventing these forces from causing measurement errors before they can affect the measurement accuracy.
Data Source
AI summary
A method determines measurement data of samples by using a rotation rheometer and a linear DM(T)A analysis unit. The rotation rheometer has units for measuring and/or adjusting the normal force exerted by or on the measurement shaft and/or the speed, deflection angle and/or torque of the measurement shaft. The linear DM(T)A analysis unit has units for measuring the tensile and/or pressure force and/or the position and/or the feed movement of its adjustment rod. The sample to be examined is arranged between opposite measurement parts. Accordingly, the rotational forces or torques transmitted via the sample from the measurement shaft to the adjusting rod, when obtaining measurement data with the linear DM(T)A analysis unit, and, when obtaining measurement data by the rotation rheometer, for the tensile or pressure forces or linear adjustment forces transmitted via the sample from the adjustment rod to the measurement shaft are compensated for.