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. 2023 Jun 24;16(13):4558. doi: 10.3390/ma16134558
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