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Research Papers

High Strain Rate Pure Shear and Axial Compressive Response of Porcine Lung Tissue

[+] Author and Article Information
B. Sanborn

Army Research Laboratory,
Building 4600,
Aberdeen Proving Ground, MD 21005
e-mail: brett.sanborn2.ctr@mail.mil

W. Chen

Schools of Aeronautics/Astronautics and Materials Engineering,
Purdue University,
West Lafayette, IN 47907

T. Weerasooriya

US Army Research Laboratory,
Aberdeen Proving Ground, MD 21005

1Corresponding author.

Manuscript received April 11, 2012; final manuscript received June 29, 2012; accepted manuscript posted November 20, 2012; published online November 20, 2012. Editor: Robert M. McMeeking.

J. Appl. Mech 80(1), 011029 (Nov 20, 2012) (6 pages) Paper No: JAM-12-1146; doi: 10.1115/1.4007222 History: Received April 11, 2012; Revised June 29, 2012; Accepted November 20, 2012

In this study, both the dynamic shear (torsion) and axial compressive responses of porcine lung tissue were examined using modified Kolsky bar techniques. High-rate compression data were collected using a Kolsky bar with a hollow transmission bar on annular specimens at strain rates between 1000–3000 s−1. The radial deformation of the annular specimen was recorded on a modified single loading Kolsky bar using high-speed imaging capabilities. The collected images and analysis of boundary movement indicated inhomogeneous specimen deformation induced by radial inertia, which significantly altered the desired uniaxial stress state in such high-rate compression test techniques. A novel torsion experimental technique was developed to obtain the dynamic pure shear behavior of lung tissue at shear strain rates above 500 s−1 without inertia effects. The pure shear response was found to be two orders of magnitude weaker than the uniaxial compressive response when compared by equivalent stress–strain relations.

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Figures

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Fig. 1

Configuration of a typical torsion specimen assembly. In this picture, an aluminum disk from one side is removed to show the details of the assembly.

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Fig. 2

Kolsky compression bar setup with hollow transmission bar for low transmitted signal collection

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Fig. 3

Modified Kolsky compression bar setup for radial deformation imaging

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Fig. 4

Schematic of torsion bar setup for direct shear response characterization of soft materials

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Fig. 5

Typical force histories at the incident and transmission bar specimen interfaces showing the dynamic force equilibrium in a lung tissue sample during a high-rate compression experiment at 2000 s−1

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Fig. 6

Typical shear strain rate and strain histories from the torsion experiment

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Fig. 7

Equivalent stress-strain curves for lung tissue at axial compression strain rates of 1300 s−1, 2000 s−1, and 3000 s−1. Note, each curve is the average behavior of five tests.

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Fig. 8

Equivalent stress-strain behavior of lung tissue at shear strain rate of 550 s−1

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Fig. 9

Radial deformation of an annular lung tissue sample during a high-rate axial compression experiment (corresponding axial engineering strain is indicated in each picture)

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Fig. 10

Radial movement of boundaries of annular sample in relation to time and strain rate

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