Related Resources: vibration

Short-Duration Acceleration and Shock Loads Table

Engineering and Design Applications

Short-Duration Acceleration Loads, Shock Loads and Approximate Duration and Magnitude of Some Applications

GIven in equivalent G-Force or "g" which is the gravitational force equivalent of earth.

The g-force experienced by an object is due to the vector sum of all non-gravitational and non-electromagnetic forces acting on an object's freedom to move. In practice, as noted, these are surface-contact forces between objects. Such forces cause stresses and strains on objects, since they must be transmitted from an object surface. Because of these strains, large g-forces may be destructive.

1g = 9.80665 m/s2 Typically used 9.81 m/s2
1g = 32.173984208 ft/s2 Typically used 32.2 ft/s2

 Type of operation Acceleration, g Duration, sec Elevators: Average in “fast service” 0.1–0.2 1–5 Comfort limit 0.3 Emergency deceleration 2.5 Public transit: Normal acceleration and deceleration 0.1–0.2 5 Emergency stop braking from 70 mph 0.4 2.5 Automobiles: Comfortable stop 0.25 5–8 Very undesirable 0.45 3–5 Maximum obtainable 0.7 3 Crash (potentially survivable) 20–100 <0.1 Aircraft: Ordinary take-off 0.5 10 Catapult take-off 2.5–6 1.5 Crash landing (potentially survivable) 20–100 Seat ejection 10–15 0.25 Man: Parachute opening, 40,000 ft 33 0.2–0.5 Parachute opening, 6,000 ft 8.5 0.5 Parachute landing 3–4 0.1–0.2 Fall into fireman’s net 20 0.1 Approximate survival limit with well-distributed forces (fall into deep snow bank) 200 0.015–0.03 Head: Adult head falling from 6 ft onto hard surface 250 0.007 Voluntarily tolerated impact with protective headgear 18–23 0.02

Reference: Harris Shock and Vibration Handbook

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