h	Distance between nearest supporting roller and loading roller in four-point bending test
k	Distance between two loading rollers in four-point bending test
L–D curve	Load–displacement curve obtained by four-point bending test or compression bending test
P	0.2% Offset load in static bending test
M	Bending strength obtained by four-point bending test or compression bending test
E	Bending stiffness obtained by four-point bending test or compression bending test
M–N curve	Maximum bending moment vs number of cycles to failure on logarithmic scale