R2 = 0.99.
E4 = 40.1


 E1 = 300 ksi tI = 6.0 in
 E2 = 85 ksi t2 = 8.0 in
 E3 = 60 ksi 13 =12.0 in
 E4 = Variable t4 = 0





 R2 = 0.9992, N = 5
 E4 = 53.252 D61.0184




98, N = 5
81 D0.9848



R2 = 0.9999, N = 5
E4 = 35.370 D80.9776


I I


 1.0 10
SENSOR DEFLECTION, D Dy D 8, milss)


Figure 4.22


Relationship Between E, and FWD Deflections for Fixed
E,, E2, and E3 Values with t1 = 6.0 in.


1000


100 -


10 1-


01
0.


100


1