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| Parameter (units) | Symbol | Formula | Lay description of parameter and relevance |
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| Force (N) | | — | Nonnormalized force |
| Undeformed fiber length (m) | | — | Initial knot-knot fiber length |
| Undeformed diameter (m) | | — | Initial fiber diameter |
| Undeformed area (m2) | | — | Initial fiber cross-sectional area |
| Deformed fiber length (m) | | — | Fiber length following longitudinal deformation |
| Deformed diameter (m) | | — | Fiber diameter following longitudinal deformation |
| Deformed area (m2) | | — | Fiber cross-sectional area following longitudinal deformation |
| Longitudinal fiber strain (dimensionless) | | | Normalized longitudinal deformation—percentage fiber extension |
| Fiber volume | | | Fiber volume after deformation, assuming a cylindrical geometry |
| Radial strain (dimensionless) | | | Normalized lateral deformation—percentage reduction in fiber diameter following longitudinal deformation; increased radial strain represents stronger coupling between longitudinal and lateral responses. |
| Cauchy (true) stress (Pa) | σ C | | Force normalized to deformed area—couples force generation to changes in 3D-fiber geometry |
| LaGrangian stress (Pa) | σ
LG | | Force normalized to undeformed area—measure of inherent load-bearing ability, decoupled from changes in 3D-fiber geometry |
| Poisson’s ratio (dimensionless) | | | Measure of relation between longitudinal strain and radial strain—lateral strain transmission |
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