Crack Initiation Characteristics of Gas-Containing Coal under Gas Pressures

Table 2

Fitting function relationships.

Relationship	Gas pressure	Fitting function
σuc-KIC	No gas		0.84
	0.5 MPa		0.78
	1.0 MPa		0.56
	1.5 MPa		0.89
σt-KIC	No gas		0.94
	0.5 MPa		0.9
	1.0 MPa		0.91
	1.5 MPa		0.82