Research on Neck Response of Elderly Drivers in Rear Collision

Table 7

Damage analysis of different vertical distances between head and headrest.

Vertical distance/mm	Maximum stress of cortical/MPa	Maximum stress of cancellous/MPa	Maximum intervertebral disc stress/MPa	Peak acceleration of head center of mass/g
+10	385	7.49	43.3	0.868
+20	388.4	7.47	43.4	0.869
+30	390.56	7.44	43.5	0.939
+40	392.6	7.45	43.8	0.9
+50	400	7.41	47.5	0.936
0	385	7.66	43.3	0.88
-10	410.8	7.67	43.4	0.847
-20	418.7	7.67	43.4	0.847
-30	452.4	7.93	43.5	0.814
-40	463.1	7.91	44.1	0.764
-50	478.1	7.68	44.5	0.854