Table III:

Material toughness and limits of mechanical strength and deformability of P22, HAdV, and HSV shells: the average toughness T, toughness threshold $T^{\ast }$, and toughness range $\tilde{T}$, and the lower bounds of critical forces $F_b^{\ast }$ and critical deformations $X_b^{\ast }$. The value of T are calculated with Eq. (16) using theoretical and experimental estimates of $\Delta G_f$ taken from Table II (separated by the slash). The values of and $T^{\ast }$ are $\tilde{T}$ obtained from the fit of theoretical distribution p(T) (Eq. (17)) to the histograms of toughness (Fig. 4). Theoretical estimates of $F_b^{\ast }$ and $X_b^{\ast }$ obtained with Eqs. (18)–(19) and experimental values of $F_b^{\ast }$ and $X_b^{\ast }$ are separated by the slash.

	Material toughness			Mechanical stability
Particle	T, kPa	$T^{\ast }$, kPa	$\tilde{T}$, kPa	$F_b^{\ast }$, nN	$X_b^{\ast }$, nm
P22 Procapsid	79/75	5	78	0.21/0.24	4.5/5.8
P22 Expanded	116/118	6	111	0.75/0.61	5.2/3.3
HAdV weak	47/48	5	42	1.29/1.05	5.4/5.1
HAdV strong	118/114	35	58.2	3.0/3.2	8.2/7.7
HSV	484/468	26	148	2.6/2.7	10.7/9.3