TABLE I.

Definitions of symbols.

	Definition	Value
γc	Strain at onset of compression stiffening
σ	Compressive stress
Kcf	Central force spring constant
Ksf	Semiflexible angular spring constant
lo	Distance between neighboring vertices at zero strain
$\tilde{\kappa }$	$\text{Dimensionless constant}-\frac{K_{cf}{l}_0^2}{K_{sf}}$	0.006 – 0.96
Kxlink	Crosslinker angular spring constant
p	Bond occupation probability	0.5 – 1
ϕ	Packing fraction of area conserving loops	0.04 – 0.25
λ	Lagrange multiplier
KA	Area-conserving loop “spring” constant
A0	Preferred area