Table 1.

Estimation of the Material Parameters of the Physical Model

E	Capsule Elastic Modulus	19.5 ± 0.7 kPa (n = 29)
Y	Capsule Poisson ratio	½
H	Capsule thickness	19.9 ± 0.4 μm (n = 54)
R	Capsule radius	97 ± 1 μm (n = 54)
${\mathcal{K}}^{cap}=E{h}^3/\left(12(1-{\upsilon }^2)\right)$	Capsule bending rigidity	17 ± 1 μNμm (n = 54)
${\text{λ}}^{cap}=Eh/(1-{\upsilon }^2)$	Capsule compressional rigidity	0.52 ± 0.02 μN/μm
$K^{cap}$	Capsule without tissues spring constant	0.064 ± 0.003 μN/μm (n = 30)
$K$	Capsule with tissues spring constant	0.074 ± 0.007 μN/μm (n = 16)
$\mathcal{K}$	Tissue bending rigidity	0.5 ± 0.2 μNμm
$\text{λ}$	Tissue compressional rigidity	0.15 ± 0.13 μN/μm
$\text{Δ}{\epsilon }_c$	Critical excess strain at the buckling transition	$\sim 0.1$
$P_{buckling}$	Pressure at the buckling transition	$\sim 100$Pa

Errors are SEM.