Factors That Affect the HVI Bundle Force Measurement

Roger S. Brown, Luther C. Godbey, and Robert A. Taylor


 
ABSTRACT

We examined mechanical rigidity of the HVI strength tester, the consistency of specimen preparation, the accuracy of bundle force and mass measurements and the effect of different testing speeds (i.e., jaw displacement rate) on HVI strength measurements. A series of experiments were conducted (using the Motion Control HVI system) to provide an objective evaluation of each design factor. Test results showed the largest measuring errors were due to differences in specimen preparation and problems associated with the air orifice method of measuring bundle mass. While no significant errors could be attributed to the mechanical design or the force measuring hardware, the data showed significant strength differences due to the speed of jaw displacement for some cotton varieties.



Reprinted from Proceedings: 1989 Beltwide Cotton Research Conferences pp. 572 - 577
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998