Multi-Directional Soft Tissue Shear Tester
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Solution Overview
Problem
Current methods for measuring the mechanical properties of soft biological tissues are limited, particularly in shear testing, as existing instruments are primarily designed for isotropic materials and cannot effectively test complex shear modes.
Innovation Solution
A mechanical property tester comprising a base, fixture, transverse and vertical force applying devices, displacement detectors, and an acquisition system that allows for the application and measurement of forces and displacements in multiple directions, enabling complex shear testing of biological soft tissues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing shear testers are used for isotropic materials, then simple shear testing can be performed, but complex shear mode testing of biological soft tissue cannot be achieved
Solution Approach 1:
The instrument divides the force application into independent transverse and vertical components, each controlled by separate actuators and detected by dedicated force detectors. This segmentation allows flexible combination of force directions to achieve various shear modes while maintaining manageable system complexity through modular design
Solution Approach 2:
The instrument is designed with multi-functional capability to perform simple shear, pure shear, and complex shear mode testing through programmed control of transverse and vertical force actuators. The same hardware platform can adapt to different testing requirements by changing control parameters and testing protocols
2Adaptability or versatility
If limited shear direction testing is used, then instrument design is simplified, but material response in complex shear mode cannot be tested
Solution Approach 1:
The instrument adds a vertical force dimension to the traditional transverse shear setup, creating a two-dimensional force application capability. This dimensional expansion enables testing in multiple shear directions and complex shear modes that cannot be achieved with single-direction actuators alone
3Measurement precision
If comprehensive force and displacement detection in multiple directions is implemented, then complex shear mode measurement is enabled, but device complexity increases
Solution Approach 1:
The instrument combines transverse and vertical force detectors with their respective actuators into integrated force application subsystems. The control system merges data from multiple detectors and actuators to compute shear stress and strain parameters, reducing overall system complexity through functional integration
Data Source
AI summary
A mechanical property tester includes a base, a fixture for fixing the biological soft tissue, a transverse force applying device for applying a transverse force, a vertical force applying device for applying a vertical force, a longitudinal pulling force detector for detecting a longitudinal force, a displacement detecting unit for detecting the displacement of the fixture, an acquisition device and a computer. The transverse force applying device includes a transverse pulling force detector for detecting the transverse force. The vertical force applying device includes a vertical pulling force detector for detecting the vertical force. The acquisition device is used for collecting the longitudinal force, transverse force, vertical force and the displacement. The computer is connected with the acquisition device to analyze the longitudinal force, transverse force, vertical force, and the displacement.