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Finite element modeling of ROPS in static testing and rear overturns.

Authors
Harris-JR; Mucino-VH; Etherton-JR; Snyder-KA; Means-KH
Source
J Agric Saf Health 2000 Aug; 6(3):215-225
NIOSHTIC No.
20020688
Abstract
Even with the technological advances of the last several decades, agricultural production remains one of the most hazardous occupations in the United States. Death due to tractor rollover is a prime contributor to this hazard. Standards for rollover protective structures (ROPS) performance and certification have been developed by groups such as the Society of Automotive Engineers (SAE) and the American Society of Agricultural Engineers (ASAE) to combat these problems. The current ROPS certification standard, SAE J2194, requires either a dynamic or static testing sequence or both. Although some ROPS manufacturers perform both the dynamic and static phases of SAE J2194 testing, it is possible for a ROPS to be certified for field operation using static testing alone. This research compared ROPS deformation response from a simulated SAE J2194 static loading sequence to ROPS deformation response as a result of a simulated rearward tractor rollover. Finite element analysis techniques for plastic deformation were used to simulate both the static and dynamic rear rollover scenarios. Stress results from the rear rollover model were compared to results from simulated static testing per SAE J2194. Maximum stress values from simulated rear rollovers exceeded maximum stress values recorded during simulated static testing for half of the elements comprising the uprights. In the worst case, the static model underpredicts dynamic model results by approximately 7%. In the best case, the static model overpredicts dynamic model results by approximately 32%. These results suggest the need for additional experimental work to characterize ROPS stress levels during staged overturns and during testing according to the SAE standard.
Keywords
Tractors; Agricultural-machinery; Agricultural-workers; Testing-equipment; Safety-research; Safety-monitoring; Safety-equipment; Standards; Models; Computer-models; Author Keywords: Rollover; Tractor; ROPS; Finite element
Contact
James R. Harris, NIOSH, Division of Safety Research, 1095 Willowdale Rd., M/S 119, Morgantown, WV 26505
CODEN
JASHFD
Publication Date
20000801
Document Type
Journal Article
Email Address
jharris@cdc.gov
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Issue of Publication
3
ISSN
1074-7583
NIOSH Division
DSR
Source Name
J Agric Saf Health
State
WV
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