scholarly journals Shear modulus and yield stress of foams: contribution of interfacial elasticity

Soft Matter ◽  
2021 ◽  
Vol 17 (14) ◽  
pp. 3937-3944
Author(s):  
Annika R. Völp ◽  
Norbert Willenbacher
Keyword(s):  
Elastic Modulus ◽  
Block Copolymer ◽  
Shear Modulus ◽  
Yield Stress ◽  
Protein Food ◽  
General Correlation

A general correlation of foam shear modulus G0 and yield stress τy with the interfacial elastic modulus of foaming solutions in shear and dilation E∞ was found for surfactant, block-copolymer, protein, food, and particle-stabilized foams.

scholarly journals Measurement of Elastic Modulus and Yield Stress by AFM Ultra-Micro-Hardness Tester.

1996 ◽  
Vol 62 (598) ◽  
pp. 1432-1437 ◽  
Author(s):  
Saburo MATSUOKA ◽  
Kensuke MIYAHARA ◽  
Nobuo NAGASHIMA ◽  
Kohichi TANAKA
Keyword(s):  
Elastic Modulus ◽  
Yield Stress ◽  
Micro Hardness ◽  
Hardness Tester

Biomimetic composites inspired by venous leaf

2017 ◽  
Vol 52 (3) ◽  
pp. 361-372 ◽  
Author(s):  
Gongdai Liu ◽  
R Ghosh ◽  
A Vaziri ◽  
A Hossieni ◽  
D Mousanezhad ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Poisson’S Ratio ◽  
Composite Structures ◽  
Volume Fraction ◽  
Matrix Material ◽  
Poisson's Ratio ◽  
Fiber Volume ◽  
Young’S Moduli

A typical plant leaf can be idealized as a composite having three principal fibers: the central mid-fiber corresponding to the mid-rib, straight parallel secondary fibers attached to the mid-fiber representing the secondary veins, and then another set of parallel fibers emanating from the secondary fibers mimicking the tertiary fibers embedded in a matrix material. This paper introduces a biomimetic composite design inspired by the morphology of venous leafs and investigates the effects of venation morphologies on the in-plane mechanical properties of the biomimetic composites using finite element method. The mechanical properties such as Young’s moduli, Poisson’s ratio, and yield stress under uniaxial loading of the resultant composite structures was studied and the effect of different fiber architectures on these properties was investigated. To this end, two broad types of architectures were used both having similar central main fiber but differing in either having only secondary fibers or additional tertiary fibers. The fiber and matrix volume fractions were kept constant and a comparative parametric study was carried out by varying the inclination of the secondary fibers. The results show that the elastic modulus of composite in the direction of main fiber increases linearly with increasing the angle of the secondary fibers. Furthermore, the elastic modulus is enhanced if the secondary fibers are closed, which mimics composites with closed cellular fibers. In contrast, the elastic modulus of composites normal to the main fiber ( x direction) exponentially decreases with the increase of the angle of the secondary fibers and it is little affected by having secondary fibers closed. Similar results were obtained for the yield stress of the composites. The results also indicate that Poisson’s ratio linearly increases with the secondary fiber angle. The results also show that for a constant fiber volume fraction, addition of various tertiary fibers may not significantly enhance the mechanical properties of the composites. The mechanical properties of the composites are mainly dominated by the secondary fibers. Finally, a simple model was proposed to predict these behaviors.

Machine learning-based design strategy for 3D printable bioink: elastic modulus and yield stress determine printability

2020 ◽  
Vol 12 (3) ◽  
pp. 035018 ◽  
Author(s):  
Jooyoung Lee ◽  
Seung Ja Oh ◽  
Sang Hyun An ◽  
Wan-Doo Kim ◽  
Sang-Heon Kim
Keyword(s):  
Machine Learning ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Design Strategy

Investigating foamed polylactic acid films through cell structure alteration and processing conditions

2017 ◽  
Vol 53 (5) ◽  
pp. 513-523 ◽  
Author(s):  
Sadakat Hussain ◽  
Kate Parker ◽  
Jean-Philippe Garancher
Keyword(s):  
Carbon Dioxide ◽  
Elastic Modulus ◽  
Surface Topography ◽  
Yield Stress ◽  
Polylactic Acid ◽  
Tensile Deformation ◽  
Cell Structure ◽  
Liquid Carbon ◽  
Ambient Temperatures ◽  
State Process

Polylactic acid films were foamed through a solid-state process using liquid carbon dioxide as a physical blowing agent. The foamed films were stretched to understand the effect of cell strut alignment on elastic modulus and yield stress normalised with density. Through stretching, cell strut alignment was achieved and verified with scanning electron microscopy. Aligning the cell struts improved the elastic modulus by a factor of 4 and the yield stress by a factor of 5 while decreasing the strain percentage at break. Aligned cell struts axially strain during tensile deformation which requires more force than unaligned cell struts which bend at initial deformations. The flexographic printability and surface topography of the foamed polylactic acid films was also analysed. The temperature used to impregnate carbon dioxide into the polylactic acid films was varied to understand its significance on printability and surface topography. Samples impregnated at ambient temperatures had smooth surface topography and a shiny lustre and good printability, whereas, samples impregnated at sub-ambient temperatures had a dull and rough texture and poor printability. Also, the carbon dioxide content had an effect on the surface topography and printability.

scholarly journals Dependence of Morphology, Shear Modulus, and Conductivity on the Composition of Lithiated and Magnesiated Single-Ion-Conducting Block Copolymer Electrolytes

2017 ◽  
Vol 50 (21) ◽  
pp. 8765-8776 ◽  
Author(s):  
Adriana A. Rojas ◽  
Kanav Thakker ◽  
Kyle D. McEntush ◽  
Sebnem Inceoglu ◽  
Gregory M. Stone ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Shear Modulus ◽  
Block Copolymer Electrolytes ◽  
Ion Conducting

scholarly journals Description of Residual Stress and Strain Fields in FGM Hollow Disc Subject to External Pressure

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 440 ◽  
Author(s):  
Stanislav Strashnov ◽  
Sergei Alexandrov ◽  
Lihui Lang
Keyword(s):  
Elastic Modulus ◽  
Plastic Strain ◽  
Yield Stress ◽  
Plastic Region ◽  
External Pressure ◽  
Plastic Strain Rate ◽  
Constant Thickness ◽  
Stress And Strain ◽  
Strain Fields ◽  
Tensile Yield Stress

Elastic/plastic stress and strain fields are obtained in a functionally graded annular disc of constant thickness subject to external pressure, followed by unloading. The elastic modulus and tensile yield stress of the disc are assumed to vary along the radius whereas the Poisson’s ratio is kept constant. The flow theory of plasticity is employed. However, it is shown that the equations of the associated flow rule, which are originally written in terms of plastic strain rate, can be integrated with respect to the time giving the corresponding equations in terms of plastic strain. This feature of the solution significantly facilitates the solution. The general solution is given for arbitrary variations of the elastic modulus and tensile yield stress along the radial coordinate. However, it is assumed that plastic yielding is initiated at the inner radius of the disc and that no other plastic region appears in the course of deformation. The solution in the plastic region at loading reduces to two ordinary differential equations. These equations are solved one by one. Unloading is assumed to be purely elastic. This assumption should be verified a posteriori. An illustrative example demonstrates the effect of the variation of the elastic modulus and tensile yield stress along the radius on the distribution of stresses and strains at the end of loading and after unloading. In this case, it is assumed that the material properties vary according to power-law functions.

Yield stress and flow measurements in ABA block copolymer melts

1987 ◽  
Vol 27 (8) ◽  
pp. 586-597 ◽  
Author(s):  
Paula J. Hansen ◽  
Michael C. Williams
Keyword(s):  
Block Copolymer ◽  
Yield Stress ◽  
Flow Measurements ◽  
Copolymer Melts

A Model of Superlattice Yield Stress and Hardness Enhancements

1995 ◽  
Vol 382 ◽  
Author(s):  
XI Chu ◽  
Scott A. Barnett
Keyword(s):  
Thin Films ◽  
Shear Modulus ◽  
Yield Stress ◽  
Shear Moduli ◽  
Average Shear ◽  
The Difference ◽  
Superlattice Period

ABSTRACTA model is presented that explains the yield stress and hardness enhancements that have been observed in superlattice thin films. The predicted strength/hardness enhancement increased with increasing superlattice period, Λ, before reaching a saturation value that depended on interface widths. The results indicate that superlattice strength/hardness depends strongly on interface widths and the difference in shear moduli of the two components for Λ values below the maximum, and on the average shear modulus for larger Λ.

On the Temperature-Related Mechanical Properties of UV-LIGA Nickel Material

2015 ◽  
Vol 645-646 ◽  
pp. 926-930 ◽  
Author(s):  
Shuang Shi Yuan ◽  
Guang He ◽  
Ming Zhang ◽  
Guo Zhong Li
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Environmental Temperature ◽  
Experimental System ◽  
Failure Stress ◽  
Uniaxial Tensile ◽  
Mechanical Parameters ◽  
Static Mechanical ◽  
The Relationship

MEMS nickel material is commonly used for structural material in micro devices. In order to study the effect of environmental temperature on its mechanical properties,this paper has built up a experimental system which can measure the temperature-related static mechanical parameters of the UV-LIGA nickel material. By using the system for uniaxial tensile experiments of the micro specimen under different temperature, the stress-strain curves of the micro specimen under different temperature were obtained; the mechanical parameters of the micro specimen such as elastic modulus, yield stress and failure stress under different temperature were also calculated out;Finally, the relationship between temperature and mechanical parameters including elastic modulus, yield stress and failure stress was analyzed.

Sign in / Sign up

Export Citation Format

Share Document