Triangular Frame Fabric Testing Apparatus for Anisotropic Strain
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Solution Overview
Problem
Existing fabric testing systems are limited to one-dimensional stretch and shear testing, failing to capture complex strain configurations and resulting stresses that are not aligned with the tested strain, which is inadequate for accurately characterizing anisotropic materials.
Innovation Solution
A multi-dimensional material testing system that allows simultaneous stretching and shear testing in X, Y, and XY directions, using a triangular frame with pivotable and sliding tracks to apply uniform strain and measure resulting forces in any combination of directions, enabling comprehensive characterization of mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one-dimensional stretch and shear testing is used, then the testing device complexity is reduced, but the measurement precision and completeness of mechanical property characterization deteriorates
Solution Approach 1:
The patent transitions from one-dimensional testing to two-dimensional planar testing by introducing a triangular frame with three movable tracks that can simultaneously apply strain in multiple directions (X, Y, and XY shear). This dimensional expansion enables comprehensive characterization of anisotropic materials while maintaining manageable device complexity through a unified geometric framework.
2Ease of operation
If existing fabric testing systems are used, then the ease of operation is maintained, but the adaptability to complex strain configurations and anisotropic materials deteriorates
Solution Approach 1:
The triangular frame with three movable tracks serves multiple functions simultaneously: it can apply uniaxial stretch in X and Y directions, apply shear strain in XY directions, and accommodate various strain configurations through coordinated track movements. This multi-functionality is achieved through a single unified structure, maintaining ease of operation while significantly enhancing adaptability to complex testing requirements.
3Measurement precision
If assumption of stress alignment with strain direction is used, then the measurement precision for simple materials is sufficient, but the reliability of data for anisotropic materials deteriorates
Solution Approach 1:
The patent introduces force transducers at each vertex of the triangular frame as intermediaries to directly measure the actual stress vectors in X, Y, and XY directions. These transducers provide direct measurement of the stress state without relying on assumptions about stress-strain alignment, enabling accurate characterization of anisotropic materials where stress may not be aligned with the applied strain directions.
Data Source
AI summary
A material testing apparatus comprising a frame having three or more tracks, and a plurality of mounts positioned within the three or more tracks. The mounts including an attachment mechanism to attach the mounts to a material being tested. The mounts including a force measurement elements. Some of the mounts free mounts that move in a track slot within the track, the free mounts free to move to any position within the track slot. The apparatus further comprising a data collector to collect data from the force measurement elements in the mounts when the material is placed under stress, to characterize the material.