Mechanics of arterial subfailure with increasing loading rate. J Biomech 2007;40(8):1806-12
Date
10/13/2006Pubmed ID
17034799DOI
10.1016/j.jbiomech.2006.07.005Scopus ID
2-s2.0-34247842705 (requires institutional sign-in at Scopus site) 31 CitationsAbstract
Arterial subfailure leads to delayed symptomatology and high morbidity and mortality rates, particularly for the thoracic aorta and carotid arteries. Although arterial injuries occur during high-velocity automotive collisions, previous studies of arterial subfailure focused on quasi-static loading. This investigation subjected aortic segments to increasing loading rates to quantify effects on elastic, subfailure, and ultimate vessel mechanics. Sixty-two specimens were axially distracted, and 92% demonstrated subfailure before ultimate failure. With increasing loading rate, stress at initial subfailure and ultimate failure significantly increased, and strain at initial subfailure and ultimate failure significantly decreased. Present results indicate increased susceptibility for arterial subfailure and/or dissection under higher-rate extension. According to the present results, automotive occupants are at greater risk of arterial injury under higher velocity impacts due to greater body segment motions in addition to decreased strain tolerance to subfailure and catastrophic failure.
Author List
Stemper BD, Yoganandan N, Pintar FAAuthors
Frank A. Pintar PhD Chair, Professor in the Biomedical Engineering department at Medical College of WisconsinBrian Stemper PhD Professor in the Biomedical Engineering department at Medical College of Wisconsin
Narayan Yoganandan PhD Professor in the Neurosurgery department at Medical College of Wisconsin
MESH terms used to index this publication - Major topics in bold
AnimalsBiomechanical Phenomena
Computer Simulation
Elasticity
In Vitro Techniques
Models, Cardiovascular
Physical Stimulation
Stress, Mechanical
Swine
Thoracic Arteries
Thoracic Injuries
Viscosity
Wounds, Nonpenetrating
