Title: High rate failure properties of human aortic tissue under longitudinal extension

Authors: Piyush Gaur; Khyati Verma; Anoop Chawla; Sudipto Mukherjee; Sanjeev Lalwani; Rajesh Malhotra; Christian Mayer; Pronoy Ghosh; Ravi Kiran Chitteti

Addresses: Department of Mechanical Engineering, Indian Institute of Technology, New Delhi – 110016, India ' Department of Mechanical Engineering, Indian Institute of Technology, New Delhi – 110016, India ' Department of Mechanical Engineering, Indian Institute of Technology, New Delhi – 110016, India ' Department of Mechanical Engineering, Indian Institute of Technology, New Delhi – 110016, India ' Department of Forensic Medicine and Orthopaedics, All India Institute of Medical Sciences, New Delhi, India ' Department of Forensic Medicine and Orthopaedics, All India Institute of Medical Sciences, New Delhi, India ' Daimler AG, 71063 Sindelfingen, Germany ' Mercedes Benz Research and Development India Pvt. Ltd., India ' Mercedes Benz Research and Development India Pvt. Ltd., India

Abstract: Understanding the failure properties of human aortic tissue at high strain rate loading is important to understand the mechanism of traumatic rupture of aorta (TRA). This study reports 18 uniaxial tensile tests performed on human aortic tissue in the longitudinal direction. Rectangular specimens were obtained from cadaveric human aortic tissue. Uniaxial tensile tests were performed at target strain rates of 0.001 s⁻¹, 65 s⁻¹, 130 s⁻¹and 190 s⁻¹ to failure. High-speed video was used to measure the gripper to gripper displacement. Failure stress and strain were calculated. The load-deformation relationship of aorta is found to be nonlinear and strain rate dependent with higher failure stress and lower effective failure engineering strains at higher strain rates. Across tests, the failure stress ranged from 0.86 MPa to 1.86 MPa and effective failure strain from 13.52% to 10.80%.

Keywords: human soft tissues; aorta; impact; strain rate dependence; tissue failure; tissue tensile characterisation.

DOI: 10.1504/IJECB.2018.092273

International Journal of Experimental and Computational Biomechanics, 2018 Vol.4 No.2/3, pp.125 - 151

Received: 07 Sep 2017
Accepted: 11 Jan 2018
Published online: 12 Jun 2018 *

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