How Can We Help?
Oblique Abdomen Hub
Background
The Oblique Abdomen Hub tool is used to process simulation results from a simulation representing the experimental tests published by Viano et al. [1]. This tool becomes active when rigid body part ID 600000 is in the loaded binout data. The goal of the tool is to allow users to compare model outputs to both literature data and to the baseline GHBMC model following internal modifications.
The thoracoabdominal impact uses a 23.4 kg impact with a 15 cm diameter and a nominal velocity of 6.7 m/s. The center of the impactor is aligned 7.5 cm below the xiphoid process at 60° from the anterior aspect of the body. Corridors were developed using the response of 5 subjects, 4 male and 1 female, with an average mass of 64 ± 15.1 kg.
The boundary condition files for validation cases are available in a directory called “validation_cases” within the Metriks installation folder: e.g. C:/Program Files (x86)/Metriks/validation_cases
When the Oblique Abdomen Hub metric is calculated, two tabs are opened:
| Panel Descriptions for “Oblique Abdomen Impact” Tab | |
|---|---|
| 3D Graphic of impact boundary condition and relevant simulation and post-processing information | Force vs Time response plotted against the Viano et al. (1989) corridors. The user loaded model is plotted in red and the baseline M50-O v5.1 with fracture on is plotted in black. |
| Force vs. Deflection response plotted against the Viano et al. (1989) corridors. The user loaded model is plotted in red and the baseline M50-O v5.1 with fracture on is plotted in black. | |
| Panel Descriptions for “Oblique Abdomen Energies” Tab | |
|---|---|
| Key aspects of the energy balance for the full simulation are reported | Human Body Model Energy Plot |
| Added mass and %Added mass as a function of initial mass are reported for the human body model | |
Data Processing Methods
Time
1. Extract simulation time from binouts
2. Set t = 0 one data point prior to initiation of impact loading (when contact force is > 0 kN)
Compression
1. Extract nodal coordinates for anterior and posterior side of the model flesh in the PDoF of the impactor, starting at t=0 defined above
a. For GHBMC M50-O v5.1.1: Default anterior NID 4226323 and posterior NID 4203254
b. These default node IDs can be overridden in Human Body Model Settings under Nodes->Viano Ant and Nodes->Viano Post
2. Deflection is calculated using the change in the Euclidean norm
Force
1. Extract resultant force data for hub to flesh contact, starting at t=0 defined above
a. For GHBMC M50-O v5.1.1: RCFORC ID 600000
2. Filter using SAE CFC 600
References
[1] Viano, D.C. (1989) Biomechanical Responses and Injuries in Blunt Lateral Impact. Stapp Car Crash J 33: 113-142.