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Published on: September 2, 2015
Numerical modeling of textile-based LCE actuators for conformal cardiac surface interaction
Achyuth Ram Annadata1, Ram Prasad Velusamy1, Tobias Lang1
1Institute of Textile Machinery and High Performance Material Technology, Faculty of Mechanical Science And Engineering, TUD Dresden University of Technology, Dresden, 01062, Germany.
Summary
Textile actuators made from Liquid Crystal Elastomer (LCE) fibers show potential for cardiac applications. Simulations reveal plain weave textiles offer better conformity and force transmission in a left ventricle model.
Area of Science:
- Biomedical Engineering
- Materials Science
- Soft Robotics
Background:
- Textile-based actuators, particularly Liquid Crystal Elastomers (LCEs), are gaining traction for biomedical uses like artificial hearts.
- Understanding the mechanical interaction between these actuators and soft biological structures is crucial for developing effective medical devices.
Purpose of the Study:
- To investigate the mechanical coupling between LCE fibers and a simulated human left ventricle (LV).
- To evaluate how different textile weave structures (plain vs. atlas) affect performance under simulated LCE contraction.
Main Methods:
- A simplified hyperelastic model of the human left ventricle was created.
- The model was wrapped with beam elements representing plain and atlas weave textiles.
- Simulations using LS-DYNA analyzed LCE contraction-induced strain, contact pressure, and displacement.
Main Results:
- The plain weave textile demonstrated superior conformity and more efficient force transmission compared to the atlas weave.
- Increased LCE strain levels were correlated with changes in contact coverage, pressure, and displacement.
Conclusions:
- Textile geometry significantly influences the mechanical coupling with soft anatomical models.
- Simulation-driven design provides a foundation for creating optimized textile LCE systems for cardiac and soft robotic applications.
