
Parameter (units)  Symbol  Formula  Lay description of parameter and relevance 

Force (N)   —  Nonnormalized force 
Undeformed fiber length (m)   —  Initial knotknot fiber length 
Undeformed diameter (m)   —  Initial fiber diameter 
Undeformed area (m^{2})   —  Initial fiber crosssectional area 
Deformed fiber length (m)   —  Fiber length following longitudinal deformation 
Deformed diameter (m)   —  Fiber diameter following longitudinal deformation 
Deformed area (m^{2})   —  Fiber crosssectional 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 3Dfiber geometry 
LaGrangian stress (Pa)  σ _{
LG}   Force normalized to undeformed area—measure of inherent loadbearing ability, decoupled from changes in 3Dfiber geometry 
Poisson’s ratio (dimensionless)    Measure of relation between longitudinal strain and radial strain—lateral strain transmission 
