Door Latch Failure Risk Identification Using Virtual Testing Methods

2017 ◽  
Vol 4 (3) ◽  
Author(s):  
Keith Friedman ◽  
Khanh Bui ◽  
John Hutchinson
Keyword(s):  
Motor Vehicle ◽  
Performance Testing ◽  
Risk Identification ◽  
Side Impact ◽  
Crash Test ◽  
Loading Conditions ◽  
Passenger Vehicle ◽  
Virtual Testing ◽  
Side Door ◽  
Failure Loads

Vehicle door latch performance testing presently utilizes uniaxial quasi-static loading conditions. Current technology enables sophisticated virtual testing of a broad range of systems. Door latch failures have been observed in vehicles under a variety of conditions. Typically, these conditions involve multi-axis loading conditions. The loading conditions presented during rollovers on passenger vehicle side door latches have not been published. Rollover crash test results, rollover crashes, and physical Federal Motor Vehicle Safety Standard (FMVSS) 206 latch testing results are reviewed. The creation and validation of a passenger vehicle door latch model is described. The multi-axis loading conditions observed in virtual rollover testing at the latch location are characterized and applied to the virtual testing of a latch in the secondary latch position. The results are then compared with crash test and real world rollover results for the same latch. The results indicate that a door latch that meets the secondary latch position requirements may fail at loads substantially below the FMVSS 206 uniaxial failure loads. In the side impact mode, risks associated with door handle designs and the potential for inertial release can be considered prior to manufacturing with virtual testing. An example case showing the effects of material and spring selection illustrates the potential issues that can be detected in advance of manufacturing. The findings suggest the need for re-examining the relevance of existing door latch testing practices in light of the prevalence of rollover impacts and other impact conditions in today's vehicle fleet environment.

Virtual Testing Applied to Door Latch Performance Evaluation

2016 ◽  
Author(s):  
Keith Friedman ◽  
Khanh Bui ◽  
John Hutchinson ◽  
Matthew Stephens
Keyword(s):  
Crash Test ◽  
Loading Conditions ◽  
Test Results ◽  
Passenger Vehicle ◽  
Virtual Testing ◽  
Side Door ◽  
Failure Loads ◽  
Vehicle Fleet ◽  
Rollover Crash ◽  
Minimum Force

Vehicle door latch minimum force capability testing presently utilizes uniaxial quasi-static loading conditions created toward the middle of the last century. Current technology enables more sophisticated virtual testing of a broad range of systems. Door latch failures have been observed in vehicles under a variety of conditions. Typically these conditions involve multiple axis loading conditions. The loading conditions presented during rollovers on passenger vehicle side door latches are not currently evaluated. Background on these conditions is reviewed. Rollover crash test results, rollover crashes and physical FMVSS 206 latch testing are reviewed. In this paper, the creation and validation of a passenger vehicle door latch model is described. The multi-axis loading conditions observed in virtual rollover testing at the latch location are characterized. These loads are then applied to the virtual testing of a latch in both the secondary and primary latch positions. The results are then compared with crash test and real world rollover results for the same latch. The results indicate that while a door latch in the secondary latch position may meet minimum existing uniaxial horizontal plane loading requirements, the incorporation of multi-axis loading conditions may result in failure of the latch to accomplish its intended purpose at loads substantially below the FMVSS 206 uniaxial failure loads. The findings suggest the need for reexamining the relevance of existing door latch testing practices in light of the prevalence of rollover impacts and other impact conditions in today’s vehicle fleet environment.

Development of Mobile Deformable Barrier for Side Impact Crashworthiness Evaluation in ASEAN New Car Assessment Programme (ASEAN NCAP)

2014 ◽  
Vol 663 ◽  
pp. 562-566 ◽  
Author(s):  
Aqbal Hafeez Ariffin ◽  
Mohd Syazwan Solah ◽  
Hamzah Azhar ◽  
Mohd Hafzi Mohd Isa ◽  
Mohd Khairudin Rahman ◽  
...  
Keyword(s):  
Protection System ◽  
Side Impact ◽  
Crash Test ◽  
Assessment Programme ◽  
Side Door ◽  
Future Assessment ◽  
Frontal Collision ◽  
Road Crash ◽  
Impact Protection ◽  
Test Requirements

Side impact crash test simulates a road crash wherein the side of a vehicle is being impacted, either perpendicularly or at an angle, by the front-end of another vehicle of about similar mass. In Malaysia, this crash configuration is the second leading cause of fatality and injury in road crashes after frontal collision. Extensive research have been carried out worldwide in order to mitigate occupant injury in side impact collision through provision of side impact protection system in vehicle such as side impact airbags and side door bars. As a result, various global regulations and consumer test requirements concerning side impacts have been established to evaluate the effectiveness of the said protection system. Recently, the Malaysian government has implemented the United Nation’s regulation pertaining to side impact protection (UN Regulation 95) for new passenger vehicles in the country. Hence, as a newly established automobile safety rating programme in the region, the ASEAN New Car Assessment Programme (ASEAN NCAP) has a plan in the pipeline to implement UN R95 side impact crash test tentatively in its future assessment scheme. A mobile deformable barrier (MDB) was developed as a preparation towards implementing the ASEAN NCAP’s side impact crashworthiness evaluation. This paper describes characteristics and requirements of the UN R95 as well as the development of the MDB according to the regulation. Several tests and improvements were conducted to ensure the MDB is reliable and having high repeatability for testing.

A Sub-System Test Methodology for Simulating EEVC Side Impact

2000 ◽  
Author(s):  
Krishnakanth Aekbote ◽  
Srinivasan Sundararajan ◽  
Joseph A. Prater ◽  
Joe E. Abramczyk
Keyword(s):  
Full Scale ◽  
Test Method ◽  
Side Impact ◽  
Vehicle Body ◽  
Crash Test ◽  
Vehicle Performance ◽  
Test Methodology ◽  
Supporting Frame ◽  
The Impact ◽  
Crash Tests

Abstract A sled based test method for simulating full-scale EEVC (European) side impact crash test is described in this paper. Both the dummy (Eurosid-1) and vehicle structural responses were simulated, and validated with the full-scale crash tests. The effect of various structural configurations such as foam filled structures, material changes, rocker and b-pillar reinforcements, advanced door design concepts, on vehicle performance can be evaluated using this methodology at the early stages of design. In this approach, an actual EEVC honeycomb barrier and a vehicle body-in-white with doors were used. The under-hood components (engine, transmission, radiator, etc.), tires, and the front/rear suspensions were not included in the vehicle assembly, but they were replaced by lumped masses (by adding weight) in the front and rear of the vehicle, to maintain the overall vehicle weight. The vehicle was mounted on the sled by means of a supporting frame at the front/rear suspension attachments, and was allowed to translate in the impact direction only. At the start of the simulation, an instrumented Eurosid-1 dummy was seated inside the vehicle, while maintaining the same h-point location, chest angle, and door-to-dummy lateral distance, as in a full-scale crash test. The EEVC honeycomb barrier was mounted on another sled, and care was taken to ensure that weight, and the relative impact location to the vehicle, was maintained the same as in full-scale crash test. The Barrier impacted the stationary vehicle at an initial velocity of approx. 30 mph. The MDB and the vehicle were allowed to slide for about 20 inches from contact, before they were brought to rest. Accelerometers were mounted on the door inner sheet metal and b-pillar, rocker, seat cross-members, seats, and non-struck side rocker. The Barrier was instrumented with six load cells to monitor the impact force at different sections, and an accelerometer for deceleration measurement. The dummy, vehicle, and the Barrier responses showed good correlation when compared to full-scale crash tests. The test methodology was also used in assessing the performance/crashworthiness of various sub-system designs of the side structure (A-pillar, B-pillar, door, rocker, seat cross-members, etc.) of a passenger car. This paper concerns itself with the development and validation of the test methodology only, as the study of various side structure designs and evaluations are beyond the scope of this paper.

scholarly journals Die relatiewe belangrikheid van verskillende evalueringskriteria by die koop van 'n passasiersvoertuig: 'n Vergelykende studie van mans en vroue

1988 ◽  
Vol 19 (1) ◽  
pp. 39-43
Author(s):  
P. J. Du Plessis ◽  
C. Boshoff
Keyword(s):  
South African ◽  
Motor Vehicle ◽  
Evaluation Criteria ◽  
Market Segment ◽  
Passenger Vehicle ◽  
Female Consumers ◽  
Market Needs ◽  
Independent Decision ◽  
Vehicle Market

A number of studies revealed that the role of women both as influencer and independent decision-maker is becoming increasingly important in the buying decision involving the purchase of a passenger vehicle. In today's highly competitive South-African motor vehicle market it is becoming vital that motor manufacturers pay greater attention to market needs - specially with regard to important market segments. This study analyses certain aspects of the market segment consisting of women. The null-hypothesis this study tested was that there are no differences between male and female consumers pertaining to the relative importance of evaluation criteria, when purchasing a passenger vehicle. By means of analysis of variance it was established that there are significant differences (P0,01) between men and women with regard to 15 of the 65 evaluation criteria. It was also found that there are 50 insignificant differences between the two groups. The hypothesis, as formulated is thus rejected, with regard to 15 of the evaluation criteria, in favour of the alternate hypothesis.

scholarly journals Children in Side Impact Motor Vehicle Crashes

2003 ◽  
Vol 8 (suppl_B) ◽  
pp. 49B-50B
Author(s):  
A Howard ◽  
L Rothman ◽  
A Moses McKeag
Keyword(s):  
Motor Vehicle ◽  
Side Impact ◽  
Motor Vehicle Crashes ◽  
Vehicle Crashes

Side Impact Injury Risk for Belted Far Side Passenger Vehicle Occupants

2005 ◽  
Author(s):  
Hampton C. Gabler ◽  
Kennerly Digges ◽  
Brian N. Fildes ◽  
Laurie Sparke
Keyword(s):  
Injury Risk ◽  
Side Impact ◽  
Passenger Vehicle ◽  
Impact Injury

THE EFFECTIVENESS OF THE COMPONENT IMPACT TEST METHOD FOR THE SIDE IMPACT INJURY ASSESSMENT OF THE DOOR TRIM

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1766-1773
Author(s):  
YOUNGHAN YOUN ◽  
JEONG-SEO KOO
Keyword(s):  
Impact Test ◽  
Reaction Force ◽  
Design Guidelines ◽  
Test Method ◽  
Abdominal Injury ◽  
Side Impact ◽  
Crash Test ◽  
Conservation Of Energy ◽  
Absorption Energy ◽  
The Impact

The complete evaluation of the side vehicle structure and the occupant protection is only possible by means of the full scale side impact crash test. But, auto part manufacturers such as door trim makers can not conduct the test especially when the vehicle is under the developing process. The main objective of this study is to obtain the design guidelines by a simple component level impact test. The relationship between the target absorption energy and impactor speed were examined using the energy absorbed by the door trim. Since each different vehicle type required different energy levels on the door trim. A simple impact test method was developed to estimate abdominal injury by measuring reaction force of the impactor. The reaction force will be converted to a certain level of the energy by the proposed formula. The target of absorption energy for door trim only and the impact speed of simple impactor are derived theoretically based on the conservation of energy. With calculated speed of dummy and the effective mass of abdomen, the energy allocated in the abdomen area of door trim was calculated. The impactor speed can be calculated based on the equivalent energy of door trim absorbed during the full crash test. With the proposed design procedure for the door trim by a simple impact test method was demonstrated to evaluate the abdominal injury. This paper describes a study that was conducted to determine sensitivity of several design factors for reducing abdominal injury values using the matrix of orthogonal array method. In conclusion, with theoretical considerations and empirical test data, the main objective, standardization of door trim design using the simple impact test method was established.

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