Forming Quality and Fatigue Behavior of Self-Piercing Riveted Joints of DP590 and AA6061 Plates

Table 7

Fatigue life statistics of two groups of SPR joints.

Joint ID	DA32						AA40
Load level	70%	60%	50%	40%	30%	19%	70%	60%	50%	40%	30%	27%
Life mean	17 600	26100	50 500	131033	427 667	1271233	17 400	39866	63 467	143333	517 367	1126600
AD	0.586	0.292	0.294	0.667	0.402	0.328	0.423	0.273	0.255	0.435	0.495	0.253
Shape parameter (α)	12.22	8.756	7.661	7.062	8.694	3.653	5.204	4.390	9.401	3.730	6.821	9.227
Scale parameter (β)	18 466	27580	53 978	141194	455 099	1413262	19 050	40408	67 047	159060	552 920	1189077