γm	Fracture surface work for forming a crack in the matrix
εcs	Composite strain at crack stabilization stage
εcu	Composite strain at failure
εmu	Failure strain of the matrix
εfu	Failure strain of the fiber
σc 1	Composite stress corresponding to the formation of the first crack
σcdrop	Drop in composite stress after the formation of the first crack
σcu	Composite tensile failure stress
σmu	Tensile strength of the matrix
σfu	Tensile strength of the fiber
τs	Frictional bond strength
a	Factor for calculating the composite strain at the crack stabilization stage
df	Fiber diameter
Ec 1	Initial elastic modulus of the composite
Ec 2	Elastic modulus of the composite after the formation of the first crack
Ecxo	Elastic modulus of the composite along the debonded interface
Em	Elastic modulus of the matrix
Ef	Elastic modulus of the fiber
fm,c	Compressive strength of the matrix
fm,fl	Flexural strength of the matrix
Gm	Matrix fracture energy
ki	Equivalent stiffness of a composite zone with full fiber–matrix bond
kxo	Equivalent stiffness of the composite along the debonding length
ltot	Total length of specimen
li	Lengths of specimen sections with full matrix–fiber bond
xo	Debonding length
Vf	Fiber volume
Vf,crit	Critical fiber volume
Vm	Matrix volume