Residual strain effects in needle-induced cavitation

Soft Matter ◽  
2019 ◽  
Vol 15 (37) ◽  
pp. 7390-7397 ◽  
Author(s):  
Christopher W. Barney ◽  
Yue Zheng ◽  
Shuai Wu ◽  
Shengqiang Cai ◽  
Alfred J. Crosby
Keyword(s):  
Residual Strain ◽  
Soft Materials ◽  
Biological Tissues ◽  
Strain Effects ◽  
Fracture Properties

Needle-induced cavitation (NIC) locally probes the elastic and fracture properties of soft materials, such as gels and biological tissues.

scholarly journals On the Rule of Mixtures for Predicting Stress-Softening and Residual Strain Effects in Biological Tissues and Biocompatible Materials

Materials ◽  
2014 ◽  
Vol 7 (1) ◽  
pp. 441-456 ◽  
Author(s):  
Alex Elías-Zúñiga ◽  
Karen Baylón ◽  
Inés Ferrer ◽  
Lídia Serenó ◽  
Maria García-Romeu ◽  
...  
Keyword(s):  
Residual Strain ◽  
Biological Tissues ◽  
Biocompatible Materials ◽  
Strain Effects ◽  
Stress Softening ◽  
Rule Of Mixtures

scholarly journals Mesoscale bicontinuous networks in self-healing hydrogels delay fatigue fracture

2020 ◽  
Vol 117 (14) ◽  
pp. 7606-7612 ◽  
Author(s):  
Xueyu Li ◽  
Kunpeng Cui ◽  
Tao Lin Sun ◽  
Lingpu Meng ◽  
Chengtao Yu ◽  
...  
Keyword(s):  
Fatigue Fracture ◽  
Polymer Network ◽  
Hierarchical Structures ◽  
Soft Materials ◽  
Biological Tissues ◽  
Crack Advance ◽  
Self Healing ◽  
Hard Phase ◽  
Soft Phase ◽  
Simple Model System

Load-bearing biological tissues, such as muscles, are highly fatigue-resistant, but how the exquisite hierarchical structures of biological tissues contribute to their excellent fatigue resistance is not well understood. In this work, we study antifatigue properties of soft materials with hierarchical structures using polyampholyte hydrogels (PA gels) as a simple model system. PA gels are tough and self-healing, consisting of reversible ionic bonds at the 1-nm scale, a cross-linked polymer network at the 10-nm scale, and bicontinuous hard/soft phase networks at the 100-nm scale. We find that the polymer network at the 10-nm scale determines the threshold of energy release rateG0above which the crack grows, while the bicontinuous phase networks at the 100-nm scale significantly decelerate the crack advance until a transitionGtranfar aboveG0. In situ small-angle X-ray scattering analysis reveals that the hard phase network suppresses the crack advance to show decelerated fatigue fracture, andGtrancorresponds to the rupture of the hard phase network.

scholarly journals Image-based analysis of uniaxial ring test for mechanical characterization of soft materials and biological tissues

Soft Matter ◽  
2019 ◽  
Vol 15 (16) ◽  
pp. 3353-3361 ◽  
Author(s):  
Eline E. van Haaften ◽  
Mark C. van Turnhout ◽  
Nicholas A. Kurniawan
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characterization ◽  
Soft Materials ◽  
Biological Tissues ◽  
Ring Test ◽  
Analysis Approach

We propose a simple image-based analysis approach to accurately estimate the mechanical properties of ring-shaped materials.

Residual strain effects on the two-dimensional electron gas concentration of AlGaN/GaN heterostructures

2001 ◽  
Vol 90 (9) ◽  
pp. 4735-4740 ◽  
Author(s):  
G. Martı́nez-Criado ◽  
A. Cros ◽  
A. Cantarero ◽  
O. Ambacher ◽  
C. R. Miskys ◽  
...  
Keyword(s):  
Residual Strain ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Strain Effects ◽  
Gas Concentration ◽  
Dimensional Electron Gas

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.

Direct Eulerian formulation of anisotropic hyperelasticity

2020 ◽  
pp. 1-6
Author(s):  
Konstantin Volokh
Keyword(s):  
Constitutive Equations ◽  
Transverse Isotropy ◽  
Strain Tensor ◽  
Soft Materials ◽  
Biological Tissues ◽  
Current Configuration ◽  
Eulerian Strain ◽  
Eulerian Formulation ◽  
Anisotropic Hyperelasticity ◽  
Structure Tensors

Abstract Abstract Many soft materials and biological tissues comprise isotropic matrix reinforced by fibers in the characteristic directions. Hyperelastic constitutive equations for such materials are usually formulated in terms of a Lagrangean strain tensor referred to the initial configuration and Lagrangean structure tensors defining characteristic directions of anisotropy. Such equations are “pushed forward” to the current configuration. Obtained in this way, Eulerian constitutive equations are often favorable from both theoretical and computational standpoints. Abstract In the present note, we show that the described two-step procedure is not necessary and anisotropic hyperelasticity can be introduced directly in terms of an Eulerian strain tensor and Eulerian structure tensors referring to the current configuration. The newly developed constitutive equation is further applied to the particular case of the transverse isotropy for the sake of illustration.

scholarly journals A Nonmonotonous Damage Model to Characterize Mullins and Residual Strain Effects of Rubber Strings Subjected to Transverse Vibrations

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Alex Elías-Zúñiga ◽  
Karen Baylón ◽  
Oscar Martínez-Romero ◽  
Ciro A. Rodríguez ◽  
Héctor R. Siller
Keyword(s):  
Experimental Data ◽  
Residual Strain ◽  
Damage Model ◽  
Material Model ◽  
Softening Function ◽  
Strain Effects ◽  
Transverse Vibrations ◽  
Theoretical Predictions ◽  
Loading And Unloading ◽  
Vibration Tests

This work focuses on the formulation of a constitutive equation to predict Mullins and residual strain effects of buna-N, silicone, and neoprene rubber strings subjected to small transverse vibrations. The nonmonotone behavior exhibited by experimental data is captured by the proposed material model through the inclusion of a phenomenological non-monotonous softening function that depends on the strain intensity between loading and unloading cycles. It is shown that theoretical predictions compare well with uniaxial experimental data collected from transverse vibration tests.

Deep Indentation and Puncture of a Rigid Cylinder Inserted into a Soft Solid

Soft Matter ◽  
2021 ◽  
Author(s):  
Christopher Wade Barney ◽  
Chao Chen ◽  
Alfred J. Crosby
Keyword(s):  
Large Strain ◽  
Biological Tissues ◽  
Fracture Properties ◽  
Rigid Cylinder ◽  
Soft Solids ◽  
Deep Indentation

Deep indentation and puncture can be used to characterize the large strain elastic and fracture properties of soft solids and biological tissues. While this characterization method is growing in application...

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