Numerical Analysis of the Influences of Geometrical Deviation on Delamination in Composite Laminates around the Countersunk Hole

Table 4

Material degradation model [23].

Failure mode	Material properties’ degradation factors
	E11	E22	E33	G12	G13	G23	υ12	υ13	υ23
Fiber tensile failure	0.009	—	—	—	—	—	—	—	—
Fiber compressive failure	0.044	—	—	—	—	—	—	—	—
In-plane matrix cracking	—	0.1	—	0.1	—	0.1	—	—	—
In-plane matrix crushing	—	0.2	—	0.2	—	0.2	—	—	—
Out-of-plane matrix cracking	—	—	0	—	0	0	—	0	—
Out-of-plane matrix crushing	—	—	0	—	0	0	—	0	—
Fiber matrix shear-out	—	—	—	0.08	0.08	0.13	0.08	0.08	0.13