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Status:Closed    Asked:Jul 06, 2011 - 09:00 AM


Is there a formula that can be used to calculate the g forces experienced during incline-impact testing?

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There is not a direct relationship between velocity and the accelerations or forces produced at impact. Acceleration (g) is primarily a function of the surfaces which are impacting - soft surfaces produce low accelerations, rigid surfaces product higher accelerations.

As an illustration: Let's say you are running as fast as you can go. Would you rather run into a brick wall, or a wall made of pillows? Your velocity would be he same (as fast as you can go), but most people would rather run into the pillow wall. It's softer, the accelerations would be less, and you'd be less likely to get hurt. Of course, the faster you are able to run the harder you'll hit (so there is an indirect relationship to velocity), but mostly it's the surface which determines impact accelerations and forces.

In an incline-impact test, the test item impacts the machine's backstop. The backstop is always the same rigidiy, but the test item could be a corrugated box, wood crate, plastic container, etc. Each of these could produce a different range of impact accelerations. And probably what you're really interested in is the acceleration reacing the product inside the package - for that you'd need to know the dynamic characteristics of the package and any cushioning.

To learn accelerations for a specific situation, you could mount accelerometers on or in the test package and take measurements at the various desired points.

Source: ISTA Staff


Jul 06, 2011 - 09:06 AM

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