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 A novel apparatus and methodology for the high frequency mechanical characterisation of ultrasoft materials

2021 ◽  
Vol 250 ◽  
pp. 01033
Author(s):  
Aaron Graham ◽  
Clive R Siviour
Keyword(s):  
Mechanical Response ◽  
Soft Materials ◽  
Biological Tissues ◽  
Image Correlation ◽  
Full Field ◽  
Mechanical Characterisation ◽  
Wide Range ◽  
Experimental Apparatus ◽  
Low Modulus ◽  
Elastic Shear

Characterising the mechanical response of ultra-soft materials is challenging, particularly at high strain rates and frequencies [1]. Time Temperature Superposition (TTS) can sometimes be used to mitigate these limitations [2], however not all materials are suitable for TTS. Biological tissues are particularly difficult to test: in addition to the extreme softness, challenges arise due to specimen inhomogeneity, sensitivity to boundary conditions, natural biological variability, and complex post-mortem changes. In the current study, a novel experimental apparatus and methodology was developed and validated using low modulus silicone elastomers as model materials. The full field visco-elastic shear response was characterised over a wide range of deformation frequencies (100-1000+ Hz) and amplitudes using Digital Image Correlation (DIC) and the Virtual Fields Method (VFM). This methodology allows for the extraction of fullfield material properties that would be difficult or impossible to obtain using traditional engineering techniques.

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.

scholarly journals Mechanical and thermodynamic properties of Aβ42, Aβ40, and α-synuclein fibrils: a coarse-grained method to complement experimental studies

2019 ◽  
Vol 10 ◽  
pp. 500-513 ◽  
Author(s):  
Adolfo B Poma ◽  
Horacio V Guzman ◽  
Mai Suan Li ◽  
Panagiotis E Theodorakis
Keyword(s):  
Thermodynamic Properties ◽  
Mechanical Response ◽  
Mechanical Stability ◽  
Experimental Studies ◽  
Soft Materials ◽  
Dynamic Imaging ◽  
Computational Method ◽  
Dynamics Simulation ◽  
Coarse Grained ◽  
Computational Techniques

We perform molecular dynamics simulation on several relevant biological fibrils associated with neurodegenerative diseases such as Aβ40, Aβ42, and α-synuclein systems to obtain a molecular understanding and interpretation of nanomechanical characterization experiments. The computational method is versatile and addresses a new subarea within the mechanical characterization of heterogeneous soft materials. We investigate both the elastic and thermodynamic properties of the biological fibrils in order to substantiate experimental nanomechanical characterization techniques that are quickly developing and reaching dynamic imaging with video rate capabilities. The computational method qualitatively reproduces results of experiments with biological fibrils, validating its use in extrapolation to macroscopic material properties. Our computational techniques can be used for the co-design of new experiments aiming to unveil nanomechanical properties of biological fibrils from a point of view of molecular understanding. Our approach allows a comparison of diverse elastic properties based on different deformations , i.e., tensile (Y L), shear (S), and indentation (Y T) deformation. From our analysis, we find a significant elastic anisotropy between axial and transverse directions (i.e., Y T > Y L) for all systems. Interestingly, our results indicate a higher mechanostability of Aβ42 fibrils compared to Aβ40, suggesting a significant correlation between mechanical stability and aggregation propensity (rate) in amyloid systems. That is, the higher the mechanical stability the faster the fibril formation. Finally, we find that α-synuclein fibrils are thermally less stable than β-amyloid fibrils. We anticipate that our molecular-level analysis of the mechanical response under different deformation conditions for the range of fibrils considered here will provide significant insights for the experimental observations.

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