scholarly journals Design Evaluation & Improvement Analysis of Vehicle Structural Crashworthiness using CAE in IIHS Frontal Crash Test

2019 ◽  
Vol 9 (1) ◽  
pp. 1575-1582
Keyword(s):  
Numerical Solutions ◽  
Forward Direction ◽  
Crash Test ◽  
Design Evaluation ◽  
Frontal Impact ◽  
Passenger Vehicle ◽  
Passenger Compartment ◽  
Frontal Crash ◽  
Design Cycle ◽  
Load Carrying

Present day advancement in numerical solutions and advanced computational power has given a new dimension to the design and development of new products. Computer Aided Engineering (CAE) is widely used in the automotive community to reduce testing, prototype building, and design improvement in the design cycle. Design modifications were aimed to get controlled energy absorption, stable passenger compartment with aim of reduced intrusions and occupant safety.In the course of developing a passenger vehicle, automotive manufacturers must take into account numerous regulatory and corporate requirements. One of the most important such requirement is Frontal offset deformable barrier test. In this test condition, the vehicle traveling in the forward direction, impacts a deformable barrier that is offset to the driver’s side of the vehicle. The barrier face is perpendicular to the direction of travel and overlaps 40% of the front of the vehicle. The scope of this project is to evaluate the performance of a sedan passenger car and to further improve its crashworthiness during an offset frontal impact event. It is demonstrated that utilization of the complete passenger compartment stiffness, continuity in the load carrying members and extending these members until rear of the passenger compartment significantly reduces intrusions during offset frontal impact.

Prehistoric Effect of the Stamping Process on the Crash Analysis of an Automobile under Frontal Impact

2013 ◽  
Vol 711 ◽  
pp. 149-154 ◽  
Author(s):  
Se Ho Kim
Keyword(s):  
Impact Load ◽  
Crash Analysis ◽  
Frontal Impact ◽  
Vehicle Model ◽  
Side Member ◽  
Frontal Crash ◽  
Full Vehicle ◽  
Load Carrying ◽  
Crash Characteristics ◽  
The Impact

In this paper, a frontal crash analysis is carried out with a full vehicle model in order to investigate the influence of stamping effects of auto-body members on the crash characteristics of the vehicle. Stamping effects are considered for load carrying members such as the front side member and the rear lower. From the analysis result considering stamping effects, it is conformed that stamping history has to be considered for longitudinal members simultaneously that transfer the impact load under the frontal impact. Comparison of simulation result with experimental one also shows that the prediction accuracy of the crash analysis is remarkably improved.

Analysis of Lower Leg Injury of Occupant in Frontal Crash Tests Based on China NCAP Protocol

2011 ◽  
Vol 279 ◽  
pp. 400-405
Author(s):  
Zhi Xin Liu ◽  
Ren Jun Wan ◽  
Yong Wan Shi
Keyword(s):  
Test Data ◽  
Lower Leg ◽  
Lower Limbs ◽  
Vehicle Safety ◽  
Upper Limbs ◽  
Frontal Impact ◽  
Passenger Vehicle ◽  
Characteristic Parameters ◽  
Frontal Crash ◽  
Crash Tests

With the popularization of passenger vehicle safety devices such as safety belt, airbag and so on, the chance that occupant’s upper limbs were injured seriously was decreased significantly in frontal impact. However, the injury of occupant’s lower limbs became more and more severe, especially on lower leg injury. 37 groups of test data of China NCAP crash tests including full-frontal rigid crash and 40% offset deformable barrier crash were investigated in this paper, and lower leg injury distributing characteristic of drivers and passengers in these two kinds of crash configurations were obtained. Finally the effect rules of characteristic parameters on lower leg injury were summarized.

Structure Improvement of the S Beam Based on the Safety of SUV

2010 ◽  
Vol 34-35 ◽  
pp. 675-680
Author(s):  
Jun Wu ◽  
Li Bo Cao ◽  
Tian Zhi Chen ◽  
Chen Chen Hu ◽  
Bing Hui Jiang ◽  
...  
Keyword(s):  
Rigid Body ◽  
Crash Test ◽  
Fe Model ◽  
Frontal Impact ◽  
Frontal Crash ◽  
Occupant Protection ◽  
Body Model ◽  
Crash Safety ◽  
Rigid Body Model ◽  
Structure Improvement

The S beam of a production SUV appeared instable deformation in frontal crash test, which was not beneficial to occupant protection. So the deformation of S beam should be controlled to improve the crashworthiness. Inner improvement structures were proposed according to the prototype S beam. A frontal crash FE model and a multi-rigid body model were developed and validated to investigate the crash safety of frontal impact. The influences of the improvements to the deformation of S beam and the energy absorption of longitudinal beams were analyzed by the FE model, and the injury risks of head and thoraces were analyzed by the multi-rigid body model. The better improvement structure was adopted in the frame for the crash test to validate the effectiveness of improved scheme, and the result shows better crash performance of frontal impact for prototype vehicle. Meanwhile, simulation study on crash safety of 40% offset crash were also conducted, which indicated that improved scheme was also beneficial for crash safety of 40% offset crash.

scholarly journals SIMULATION OF VEHICULAR FRONTAL CRASH-TEST

2012 ◽  
pp. 262-267
Author(s):  
TEJASAGAR AMBATI ◽  
K.V.N.S. SRIKANTH ◽  
P. VEERARAJU
Keyword(s):  
Automotive Industry ◽  
Development Time ◽  
Crash Test ◽  
Test Results ◽  
Crash Analysis ◽  
Frontal Impact ◽  
Frontal Crash ◽  
Huge Impact ◽  
Analysis Center ◽  
Crash Characteristics

This paper “SIMULATION OF FRONTAL CRASH-TEST” The simulation of vehicle crashes by using computer softwares has become an indispensible tool for shortening automobile development time and lowering costs. It also has huge impact on the crashworthiness of an automobile. This work reports on the simulated crash test of an automobile. The objective of this work is to simulate a frontal impact crash of an automobile and validate the results. The aim is also to alter some of the materials of the components with a view to reduce the forces experienced during the crash. Computer models were used to test the crash characteristics of the vehicle in the crash. The model used here was that of a Chevrolet C1500 pick-up truck. The software used for the simulation is LS-DYNA. It is widely used by the automotive industry to analyze vehicle designs. It accurately predicts a car's behavior in a collision. The results obtained by the simulation were then validated by comparing it with the test results of the same test performed by the NCAC (National Crash Analysis Center).

Lower Extremity Mechanism and Responses in Various Frontal Impact Configurations

2017 ◽  
Author(s):  
Saeed Barbat ◽  
Xiaowei Li
Keyword(s):  
Lower Extremity ◽  
Oblique Impact ◽  
Instrument Panel ◽  
Crash Test ◽  
Frontal Impact ◽  
Vehicle Interior ◽  
Rigid Barrier ◽  
Frontal Crash ◽  
Crash Tests ◽  
Small Overlap

An analysis of the lower extremity responses in various frontal impact test configurations was performed. The THOR-LX anthropomorphic test device (ATD) representing a mid-size adult male was used. Four groups of frontal crash test data were analyzed. These groups included: Rigid Fixed Barrier (RFB), Moderate Overlap Offset Deformable Barrier (ODB), Small Overlap Rigid Barrier (SORB), and Oblique Impact (OI) crash tests.. This analysis indicated that the lower extremity responses could be high especially in the oblique impact and small overlap crash tests. This study focused on understanding the causes of the resulting high responses. ATD lower extremity kinematics and interaction with intruded body structure and/or instrument panel varied in the different frontal impact configurations. Therefore, the dominant causes of lower extremity responses in terms of tibia forces and moments were not the same for all frontal crash modes. Maximum Tibia Index results associated with the four groups of frontal impact tests were used to develop a better understanding of ATD kinematics and response mechanisms of the lower extremities. The contact sequence of the lower leg to vehicle interior components was illustrated for OI. This paper investigated the cause of lower extremity responses in these crash tests. Analysis indicated that the time at which maximum intrusion occurs did not necessarily coincide with the time of maximum lower extremity responses expressed by the Tibia Index.

The Effect of Journal Bearing Misalignment on Load and Cavitation for Non-Newtonian Lubricants

1986 ◽  
Vol 108 (4) ◽  
pp. 645-654 ◽  
Author(s):  
R. H. Buckholz ◽  
J. F. Lin
Keyword(s):  
Reynolds Equation ◽  
Numerical Solutions ◽  
Journal Bearings ◽  
Surface Boundary ◽  
Film Rupture ◽  
Aspect Ratios ◽  
Free Surface Boundary Condition ◽  
Load Carrying ◽  
Boundary Location ◽  
Surface Boundary Condition

An analysis for hydrodynamic, non-Newtonian lubrication of misaligned journal bearings is given. The hydrodynamic load-carrying capacity for partial arc journal bearings lubricated by power-law, non-Newtonian fluids is calculated for small valves of the bearing aspect ratios. These results are compared with: numerical solutions to the non-Newtonian modified Reynolds equation, with Ocvirk’s experimental results for misaligned bearings, and with other numerical simulations. The cavitation (i.e., film rupture) boundary location is calculated using the Reynolds’ free-surface, boundary condition.

Crash Test Ratings and Real-World Frontal Crash Outcomes: A CIREN Study

2010 ◽  
Vol 68 (5) ◽  
pp. 1099-1105 ◽  
Author(s):  
Gabriel E. Ryb ◽  
Cynthia Burch ◽  
Timothy Kerns ◽  
Patricia C. Dischinger ◽  
Shiu Ho
Keyword(s):  
Real World ◽  
Crash Test ◽  
Frontal Crash

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.

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