Microscopic Constitutive Equation Theory for the Nonlinear Mechanical Response of Polymer Glasses

2008 ◽  
Vol 41 (15) ◽  
pp. 5908-5918 ◽  
Author(s):  
Kang Chen ◽  
Kenneth S. Schweizer
Keyword(s):  
Constitutive Equation ◽  
Mechanical Response ◽  
Polymer Glasses ◽  
Nonlinear Mechanical

Novel Soft Materials with Nonlinear Mechanical Response

2021 ◽  
Vol MA2021-02 (55) ◽  
pp. 1591-1591
Author(s):  
Takanori Sato ◽  
Yosuke Watanabe ◽  
Nahin Islam Shiblee ◽  
Ajit Khosla ◽  
Jun Ogawa ◽  
...  
Keyword(s):  
Mechanical Response ◽  
Soft Materials ◽  
Nonlinear Mechanical

The actin crosslinker filamin plays a key role in the nonlinear mechanical response of living cells

2006 ◽  
Vol 39 ◽  
pp. S231
Author(s):  
K. Kasza ◽  
F. Nakamura ◽  
S. Hu ◽  
T. Stossel ◽  
N. Wang ◽  
...  
Keyword(s):  
Mechanical Response ◽  
Living Cells ◽  
Nonlinear Mechanical

Efficient Nonlinear Energy Harvesting with Wrinkled Piezoelectric Membranes

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Igor Neri ◽  
Miquel López-Suárez
Keyword(s):  
Power Density ◽  
Mechanical Response ◽  
Excitation Amplitude ◽  
Electric Response ◽  
Noise Power ◽  
External Excitation ◽  
Piezoelectric Energy ◽  
Nonlinear Mechanical ◽  
Nonlinear Regimes ◽  
Nonlinear Energy

AbstractWe investigate the performance of a piezoelectric energy harvester with nonlinearity induced by wrinkles. Linear and nonlinear regimes are detected in the electric response of the device when sweeping the intensity of the external excitation. Those regimes are related to the activation of a nonlinear mechanical response that appears when increasing the excitation amplitude. The wrinkles have been found to improve the power density and the normalized power density, in a certain noise power range.

scholarly journals Modeling the initial mechanical response and yielding behavior of gelled crude oil

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 292-301 ◽  
Author(s):  
Chen Lei ◽  
Liu Gang ◽  
Lu Xingguo ◽  
Xu Minghai ◽  
Tang Yuannan
Keyword(s):  
Shear Stress ◽  
Constitutive Equation ◽  
Crude Oil ◽  
Shear Strain ◽  
Mechanical Response ◽  
Shear Rates ◽  
Mechanical Analog ◽  
Constant Shear ◽  
Jeffreys Model ◽  
Yielding Behavior

Abstract The initial mechanical response and yielding behavior of gelled crude oil under constant shear rate conditions were investigated. By putting the Maxwell mechanical analog and a special dashpot in parallel, a quasi-Jeffreys model was obtained. The kinetic equation of the structural parameter in the Houska model was simplified reasonably so that a simplified constitutive equation of the special dashpot was expressed. By introducing a damage factor into the constitutive equation of the special dashpot and the Maxwell mechanical analog, we established a constitutive equation of the quasi-Jeffreys model. Rheological tests of gelled crude oil were conducted by imposing constant shear rates and the relationship between the shear stress and shear strain under different shear rates was plotted. It is found that the constitutive equation can fit the experimental data well under a wide range of shear rates. Based on the fitted parameters in the quasi-Jeffreys model, the shear stress changing rules of the Maxwell mechanical analog and the special dashpot were calculated and analyzed. It is found that the critical yield strain and the corresponding shear strain where shear stress of the Maxwell analog is the maximum change slightly under different shear rates. And then a critical damage softening strain which is irrelevant to the shearing conditions was put forward to describe the yielding behavior of gelled crude oil.

scholarly journals Mechanical response of inelastic constitutive equation with non-coaxiality based on anisotropy and tangential stress effect for soils

2002 ◽  
Vol 5 ◽  
pp. 401-409
Author(s):  
Seiichiro Tsutsumi ◽  
Koichi Hashiguchi ◽  
Masaya Sugimoto ◽  
Kiyohiro Ikeda ◽  
Yuki Yamakawa
Keyword(s):  
Constitutive Equation ◽  
Tangential Stress ◽  
Mechanical Response ◽  
Stress Effect

Measurement of the axial and circumferential mechanical properties of rat skin tissue at different anatomical locations

2015 ◽  
Vol 60 (2) ◽  
Author(s):  
Alireza Karimi ◽  
Maedeh Haghighatnama ◽  
Mahdi Navidbakhsh ◽  
Afsaneh Motevalli Haghi
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Mechanical Behavior ◽  
Clinical Decision Making ◽  
Mechanical Response ◽  
The Body ◽  
Skin Tissue ◽  
Linear Elastic ◽  
Biomechanical Models ◽  
Nonlinear Mechanical

AbstractSkin tissue is not only responsible for thermoregulation but also for protecting the human body from mechanical, bacterial, and viral insults. The mechanical properties of skin tissue may vary according to the anatomical locations in the body. However, the linear elastic and nonlinear hyperelastic mechanical properties of the skin in different anatomical regions and at different loading directions (axial and circumferential) so far have not been determined. In this study, the mechanical properties during tension of the rat abdomen and back were calculated at different loading directions using linear elastic and nonlinear hyperelastic material models. The skin samples were subjected to a series of tensile tests. The elastic modulus and maximum stress of the skin tissues were measured before the incidence of failure. The nonlinear mechanical behavior of the skin tissues was also computationally investigated through a constitutive equation. Hyperelastic strain energy density function was calibrated using the experimental data. The results revealed the anisotropic mechanical behavior of the abdomen and the isotropic mechanical response of the back skin. The highest elastic modulus was observed in the abdomen skin under the axial direction (10 MPa), while the lowest one was seen in the back skin under axial loading (5 MPa). The Mooney-Rivlin material model closely addressed the nonlinear mechanical behavior of the skin at different loading directions, which can be implemented in the future biomechanical models of skin tissue. The results might have implications not only for understanding of the isotropic and anisotropic mechanical behavior of skin tissue at different anatomical locations but also for providing more information for a diversity of disciplines, including dermatology, cosmetics industry, clinical decision making, and clinical intervention.

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