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Door Latch Integrity Study: Evaluation of Door Latch Failure Modes.

PB95171179

Publication Date	1994
Personal Author	Howe, J. G.; Leigh, M.; Willke, D. T.
Page Count	68
Abstract	This report contains the results of an investigation conducted by the Vehicle Research and Test Center (VRTC) to determine the potential for different door latch failure modes. In a previous study performed at the VRTC, several door latch failure mechanisms were identified which included structural failure, detent lever-fork bolt bypass, linkage activation, and inertial loading. All four of these failure mechanisms were evaluated in this study. Structural failure was evaluated by performing FMVSS 206 door latch tests, full door longitudinal and lateral tension tests similar to those for FMVSS 206, and simulated B-pillar twist latch tests using the GM Rotational Test fixture. Detent lever-fork bolt bypass was tested using a component level test fixture. Full door testing for detent lever-fork bolt bypass has been performed in a previous study. Linkage activation was evaluated in the full door longitudinal tension tests discussed previously. The doors were subjected to inertial loading in several different directions. The results of all the different types of testing conducted suggest that no one test procedure will determine the weak link in all types of latches. Several test procedures should be required to fully evaluate door latch strength.
Keywords	Door latches Automobiles Structural failure Impact tests Failure modes Failure analysis Safety engineering Automotive engineering Failure(Mechanics) Loads(Forces) Test methods Transportation safety Tension Accident research Impact forces Linkage activation Detent Lever-Fork Bolt Bypass
Source Agency	Highway Traffic Safety
NTIS Subject Category	85D - Transportation Safety 85H - Road Transportation
Corporate Authors	National Highway Traffic Safety Administration, East Liberty, OH. Vehicle Research and Test Center.
Supplemental Notes	See also PB87-192571, PB89-178347 and PB93-219657.
Document Type	Technical Report
Title Note	Final rept. Jan 93-Jan 94.
NTIS Issue Number	199508

Door Latch Integrity Study: Evaluation of Door Latch Failure Modes.

Door Latch Integrity Study: Evaluation of Door Latch Failure Modes.
PB95171179

Publication Date	1994
Personal Author	Howe, J. G.; Leigh, M.; Willke, D. T.
Page Count	68
Abstract	This report contains the results of an investigation conducted by the Vehicle Research and Test Center (VRTC) to determine the potential for different door latch failure modes. In a previous study performed at the VRTC, several door latch failure mechanisms were identified which included structural failure, detent lever-fork bolt bypass, linkage activation, and inertial loading. All four of these failure mechanisms were evaluated in this study. Structural failure was evaluated by performing FMVSS 206 door latch tests, full door longitudinal and lateral tension tests similar to those for FMVSS 206, and simulated B-pillar twist latch tests using the GM Rotational Test fixture. Detent lever-fork bolt bypass was tested using a component level test fixture. Full door testing for detent lever-fork bolt bypass has been performed in a previous study. Linkage activation was evaluated in the full door longitudinal tension tests discussed previously. The doors were subjected to inertial loading in several different directions. The results of all the different types of testing conducted suggest that no one test procedure will determine the weak link in all types of latches. Several test procedures should be required to fully evaluate door latch strength.
Keywords	Door latches Automobiles Structural failure Impact tests Failure modes Failure analysis Safety engineering Automotive engineering Failure(Mechanics) Loads(Forces) Test methods Transportation safety Tension Accident research Impact forces Linkage activation Detent Lever-Fork Bolt Bypass
Source Agency	Highway Traffic Safety
NTIS Subject Category	85D - Transportation Safety 85H - Road Transportation
Corporate Authors	National Highway Traffic Safety Administration, East Liberty, OH. Vehicle Research and Test Center.
Supplemental Notes	See also PB87-192571, PB89-178347 and PB93-219657.
Document Type	Technical Report
Title Note	Final rept. Jan 93-Jan 94.
NTIS Issue Number	199508