Mechanical stability analysis is instructive in explaining biological processes like morphogenesis, organogenesis, and pathogenesis of soft tissues. Consideration of the layered, residually stressed structure of tissues, requires accounting for the joint effects of interface conditions and layer incompatibility. This paper is concerned with the influence of imposed rate (incremental) interface conditions (RICs) on critical loads in soft tissues, within the context of linear bifurcation analysis. Aiming at simplicity, we analyze a model of bilayered isotropic hyperelastic (neo-Hookean) spherical shells with residual stresses generated by “shrink-fitting” two perfectly bonded layers with radial interfacial incompatibility. This setting allows a comparison between available, seemingly equivalent, interface conditions commonly used in the literature of layered media stability. We analytically determine the circumstances under which the interface conditions are equivalent or not, and numerically demonstrate significant differences between interface conditions with increasing level of layer incompatibility. Differences of more than tenfold in buckling and 30% in inflation instability critical loads are recorded using the different RICs. Contrasting instability characteristics are also revealed using the different RICs in the presence of incompatibility: inflation instability can occur before pressure maximum, and spontaneous instability may be excluded for thin shells. These findings are relevant to the growing body of stability studies of layered and residually stressed tissues. The impact of interface conditions on critical thresholds is significant in studies that use concepts of instability to draw conclusions about the normal development and the pathologies of tissues like arteries, esophagus, airways, and the brain.
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October 2019
Research-Article
Instability of Incompatible Bilayered Soft Tissues and the Role of Interface Conditions
Nir Emuna,
Nir Emuna
Faculty of Aerospace Engineering,
Technion—Israel Institute of Technology,
Haifa 32000, Israel
e-mail: emuna@campus.technion.ac.il
Technion—Israel Institute of Technology,
Haifa 32000, Israel
e-mail: emuna@campus.technion.ac.il
1Corresponding author.
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David Durban
David Durban
Faculty of Aerospace Engineering,
Technion—Israel Institute of Technology,
Haifa 32000, Israel
e-mail: aer6903@technion.ac.il
Technion—Israel Institute of Technology,
Haifa 32000, Israel
e-mail: aer6903@technion.ac.il
Search for other works by this author on:
Nir Emuna
Faculty of Aerospace Engineering,
Technion—Israel Institute of Technology,
Haifa 32000, Israel
e-mail: emuna@campus.technion.ac.il
Technion—Israel Institute of Technology,
Haifa 32000, Israel
e-mail: emuna@campus.technion.ac.il
David Durban
Faculty of Aerospace Engineering,
Technion—Israel Institute of Technology,
Haifa 32000, Israel
e-mail: aer6903@technion.ac.il
Technion—Israel Institute of Technology,
Haifa 32000, Israel
e-mail: aer6903@technion.ac.il
1Corresponding author.
This work is based on part of a Ph.D. thesis submitted at the Technion, Israel Institute of Technology.
Manuscript received November 30, 2018; final manuscript received April 14, 2019; published online July 29, 2019. Assoc. Editor: Seungik Baek.
J Biomech Eng. Oct 2019, 141(10): 101012 (12 pages)
Published Online: July 29, 2019
Article history
Received:
November 30, 2018
Revised:
April 14, 2019
Citation
Emuna, N., and Durban, D. (July 29, 2019). "Instability of Incompatible Bilayered Soft Tissues and the Role of Interface Conditions." ASME. J Biomech Eng. October 2019; 141(10): 101012. https://doi.org/10.1115/1.4043560
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