$a$	void diameter
$a_0$	initial void diameter
$b$	Burgers vector
$f$	void volume fraction
$\dot{f}$	the rate of increase in the total fraction of voids
$f^{*}$	actual void volume fraction
$f_0$	initial void volume fraction (for unstrained material)
$f_c$	critical void volume fraction at the onset of coalescence initiation
${\dot{f}}_{coalescence}$	the rate of increase in the fraction of voids resulting from their rapid joining under shear stresses
$f_F$	void volume fraction at failure
${\dot{f}}_{growth}$	the rate of increasing the fraction of existing voids
${\dot{f}}_{nucl}$	the rate of increase in nucleated voids’ volume fraction
$h$	anisotropy coefficient
$k$	multiplier in power hardening law
$k_m$	coefficient depending on the particle shape
$k_s$	coefficient depending on the shape (aspect ratio) of the particle and its orientation in relation to the loading direction
$max\left({\left.{\sigma }_1^p\right|}_{\delta \le \beta }\right)$	maximum value of principal stress in the particle
$max\left({\left.{\sigma }_{\eta \eta }\right|}_{\delta =\beta }\right)$	maximum value of the stress normal to the phases contact surface
$n$	exponent in power hardening law
$q$	stress concentration factor, correction factor in GTN model
$q_1, q_3$	Tvergaard coefficients
$r$	polar coordinate measured from the “head” of dislocation pile-up
$r_1$	characteristic length
$s_N$	standard deviation
$C$	coefficient expressing the ratio of the void elongation to the specimen elongation rate (on a macroscopic scale) in Brown and Embury model, $C\in 1,2$
$E$	Young’s modulus of the matrix
$E_p$	matrix plastic equivalent modulus of elasticity
$L$	Lode parameter
$R$	particle radius
$\dot{R}$	void radius growth rate
$R_0$	initial particle radius
$R_{actual}$	actual particle radius
$S$	remote normal stress
$V_{material}$	total volume of material
$V_{voids}$	volume of voids and second phase particles
$W$	void aspect ratio
$\alpha$	coefficient in Brown–Embury model, coefficient depending on matrix hardening exponent in Thomason model
$\mathsf{\beta }$	radial coordinate of particle surface in Thomason model
$\gamma$	surface energy
$\mathsf{\delta }$	generalized radial coordinate in Thomason model
$\epsilon$	strain
$\dot{\epsilon }$	strain rate
${\epsilon }_{crit}$	critical strain of particle–matrix separation
${\dot{\epsilon }}_e$	increase in effective plastic strain
${\epsilon }_N$	void nucleation strain
${\epsilon }_p$	plastic strain
${\epsilon }_z$	longitudinal strain of the cylinder in McClintock model
$\eta$	stress state triaxiality ratio
$\theta$	Lode angle
${\kappa }^I$	stress concentration factor at the interface of phases
${\kappa }^p$	coefficient of normal stress concentration inside the particle
$\lambda$	coefficient in Beremin nucleation model, depending on particle shape
$\mu$	shear modulus
${\mu }^{*}$	coefficient depending on the elastic parameters of particle, matrix, and the geometric characteristics of particle
$\sigma$	stress
${\sigma }_0$	yield stress
${\sigma }_1, {\sigma }_2, {\sigma }_3$	principal stresses
${\sigma }_1^{max}$	maximum value of global tensile principal stress
${\dot{\sigma }}_1^{max}$	rate of the maximum global principal stress increase
${\sigma }_{crit}$	critical stress, dependent on the nucleation mechanism, matrix, particle, and the interface strength
${\sigma }_{crit}^{interface}$	critical stress at the phase interface
${\sigma }_{crit}^{mean}$	mean value of void nucleation stress
${\sigma }_{crit}^{particle}$	theoretical strength of the particle material
${\sigma }_e$	von Mises equivalent stress
${\dot{\sigma }}_e$	rate of von Mises equivalent stress increase
${\sigma }_h$	Hill’s equivalent stress
${\sigma }_{loc}\left(r\right)$	maximum local normal stress at the “head” of dislocation pile-up
${\sigma }_m$	mean stress (hydrostatic pressure)
${\sigma }_n$	critical normal stress in Thomason model
${\tau }_0$	yield stress at pure shear
$\chi$	ratio of void length to the distance between neighboring voids
${\in }_{eq}$	equivalent plastic strain
$\mathsf{Ø}$	damage function of the particle–matrix interface
${\nu }_p$	equivalent Poisson coefficient