65 60 Compression Strength Retained Over Time, Under Load Percent Strength Retained 55 50 45 data by: Industry Sources 40 0 50 100 150 200 250 300 350 400 Load Application (Days)
TL = 162 (1.4 H) L W 9. 8 DF TL = 162 (2.7 H) L W 9. 8 DF
22
1.00E-01 1.00E-02 PSD (Grms2/Hz) 1.00E-03 1.00E-04 1.00E-05 0.1 1.0 10.0 100.0 1000.0 Frequency (Hz)
PSD (Grms2/Hz) 1.00E-01 1.00E-02 1.00E-03 ISTA Steel Spring Truck 0.54grms ISTA Air Ride Truck 0.28grms ASTM Truck level1 0.73grms ASTM Truck level2 0.52grms ASTM Truck level3 0.37grms 1.00E-04 1.00E-05 0.1 1.0 10.0 100.0 1000.0 Frequency (Hz)
g 140 100 60 20-20 0 5 10 15 20 25 ms 35 25 15 5-5 80 90 100 110 120 130 140 150
2.5 冲击