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Technical Paper

ATD Response in Oblique Crash Tests

2016-04-05
2016-01-1490
Oblique crashes to the vehicle front corner may not be characteristic of either frontal or side impacts. This research evaluated occupant response in oblique crashes for a driver, rear adult passenger, and a rear child passenger. Occupant responses and injury potential were evaluated for seating positions as either a far-or near-side occupant. Two crash tests were conducted with a subcompact car. The vehicle’s longitudinal axis was oriented 45 degrees to the direction of travel on a moving platform and pulled into a wall at 56 km/h. Dummies utilized for the seating positions were an adult dummy (50th-percentile-HIII and THOR-Alpha) for the front-left (driver) position, 5th-percentile-female-HIII for the right-rear position, and a 3-year-old HIII for the left-rear position.
Journal Article

Classifiers to Augment the CDC System to Distinguish the Role of Structure in a Frontal Impact Taxonomy

2012-04-16
2012-01-0575
The purpose of the study was to distinguish the role of vehicle structure in frontal impacts in published coded National Automotive Sampling System (NASS-CDS) data. The criteria used: Collision Deformation Classification (CDC) coding rules, crush profile locator data and the projected location of longitudinal structural members in models of vehicle class sizes used by NASS-CDS. Two classifiers were developed to augment the CDC system. The Coincidence classifier indicates the relationship between the quadrant of the clock face the crash vector originates in and the aspect of the end plane the center of damage is located. It has three values: Linear (12 o'clock impacts) Consistent and Variant ("oblique" Principal Directions of Force or PDOFs). The second classifier indicates the number of longitudinal members engaged: 0, 1 or 2. NASS-CDS data for sample years 2005 to 2009 was filtered for occupants involved in impacts with the highest ranked speed change assigned to the front-end plane.
Technical Paper

Biomechanics of Human Occupants in Simulated Rear Crashes: Documentation of Neck Injuries and Comparison of Injury Criteria

2000-11-01
2000-01-SC14
The objective of this study was to subject small female and large male cadavers to simulated rear impact, document soft-tissue injuries to the neck, determine the kinematics, forces and moments at the occipital condyles, and evaluate neck injury risks using peak force, peak tension and normalized tension-extension criteria. Five unembalmed intact human cadavers (four small females and one large male) were prepared using accelerometers and targets at the head, T1, iliac crest, and sacrum. The specimens were placed on a custom- designed seat without head restraint and subjected to rear impact using sled equipment. High-speed cameras were used for kinematic coverage. After the test, x-rays were obtained, computed tomography scans were taken, and anatomical sections were obtained using a cryomicrotome. Two female specimens were tested at 4.3 m/s (mean) and the other two were tested at 6.8 m/s (mean), and one large male specimen was subjected to 6.6 m/s velocity.
Technical Paper

Child Neck Strength Characteristics Using An Animal Model

2000-11-01
2000-01-SC06
The purpose of this study was to determine neck strength characteristics of children indirectly using scaling relationships through a caprine animal model. Because of the necessity to evaluate airbag designs for injury risk to the out- of-position child, a strong foundation of experimental data is needed to obtain appropriate tolerance values. Cadaver caprine cervical spines of different ages were tested mechanically in non-destructive bending and destructive tensile modes. Injuries induced in destructive testing such as endplate failure and ligament tears were consistent with clinical observations. Specimens demonstrated statistically significant increased strength characteristics with age. Scaling relationships were developed with respect to the adult specimens. For the tensile failure load the scaling percentages were 78%, 38%, 20%, and 12% for the twelve-, six-, three-, and one-year-old, respectively.
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