PKSC 1020 Lecture 10: Package_Testing_-_Part2
26 Sep 2017
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Drop - figure 17. 1 p. 427: 90-100% of next day air parcels are dropped 30 or more. 17. 2 p. 428 lighter weight packages are dropped from greater heights. 1 thicker cushion absorbs more energy and allows greater static load. 17. 3 p. 429: average impact speed is ~5mph. Shock - table 17. 2 p. 434 lower g factor= more fragile item. 2 initial shock impulse spreads out over time with a cushion (attenuation) 17. 6 p. 436: sources of vibration vary from 2-50hz. 17. 7 p. 438: boxes vibrate when they match the same frequency of the truckbed. 17. 9: how an object response to vibration 3 ways. Compression fig. 17. 10: box strength reduces with increased time. 17. 14 p. 444: overhang reduces stacking strength by as much as 46% 17. 15 p. 445: primary package becomes main support. 17. 16 p. 445: bulged sides reduced stacking strength. Question: a box is designed to hold 50 lbs. with 4 of the exact same type stacked above it.
