Biaxial Finite Deformations of Arterial and Benous Segments under Plus or Minus Gz Acceleration Stress
Abstract
Recent developments in spacecraft and high performance aircraft have resulted in the exposure if the human body to the hazards of high accelerations beyond tolerance levels. Circulatory impairment is one of the manifestations of acceleration trauma. A major cause for circulatory failure is the pooling of blood in the extremities of the body. An analytical procedure to calculate the deformations of arterial and venous segments subjected to plus or minus Gz acceleration profiles is developed using a large elastic deformation theory. In the past, most models that described the cardiovascular system response to acceleration stress has considered only radial displacements of the vessel wall. In this work both radial and axial displacements are considered to described the pooling capacity of the blood vessels more accurately. The governing, nonlinear, partial differential equations are solved numerically by a Runge-Kutta integration method. The deformations of blood vessels are calculated for various transmural pressures and wall transactions that correspond to a range of realistic accelerations. (RRH)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1979
- Accession Number
- ADA215836
Entities
People
- Xavier J. Avula