Predictive model for the spherical indentation of composite laminates with finite thickness

2016 ◽  
Vol 153 ◽  
pp. 468-477 ◽  
Author(s):  
A. Wagih ◽  
P. Maimí ◽  
N. Blanco ◽  
D. Trias
Keyword(s):  
Predictive Model ◽  
Composite Laminates ◽  
Finite Thickness ◽  
Spherical Indentation

Micromechanics-based predictive model for compressively loaded angle-ply composite laminates

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 2299-2304
Author(s):  
Jung Hyun Ahn ◽  
Anthony M. Waas
Keyword(s):  
Predictive Model ◽  
Composite Laminates

Machine Learning Based Predictive Model for AFP-Based Unidirectional Composite Laminates

2020 ◽  
Vol 16 (4) ◽  
pp. 2315-2324 ◽  
Author(s):  
Chathura Wanigasekara ◽  
Ebrahim Oromiehie ◽  
Akshya Swain ◽  
B. Gangadhara Prusty ◽  
Sing Kiong Nguang
Keyword(s):  
Machine Learning ◽  
Predictive Model ◽  
Composite Laminates ◽  
Unidirectional Composite

Finite Thickness Influence on Spherical and Conical Indentation on Viscoelastic Thin Polymer Film

2005 ◽  
Vol 127 (1) ◽  
pp. 33-37 ◽  
Author(s):  
V. Gonda ◽  
J. den Toonder ◽  
J. Beijer ◽  
G. Q. Zhang ◽  
L. J. Ernst
Keyword(s):  
Polymer Film ◽  
Material Properties ◽  
Finite Thickness ◽  
Thin Polymer Film ◽  
Spherical Indentation ◽  
Infinite Plane ◽  
Precise Knowledge ◽  
Thin Polymer ◽  
Measurement Results ◽  
Conical Indentation

The thermo-mechanical integration of polymer films requires a precise knowledge of material properties. Nanoindentation is a widely used testing method for the determination of material properties of thin films such as Young’s modulus and the hardness. An important assumption in the analysis of the indentation is that the indented medium is a semi-infinite plane or half space, i.e., it has an “infinite thickness.” In nanoindentation the analyzed material is often a thin film that is deposited on a substrate. If the modulus ratio is small, (soft film on hard substrate) and the penetration depth is small too, then the Hertzian assumption does not hold. We investigate this situation with spherical and conical indentation. Measurement results are shown using spherical indentation on a visco-elastic thin polymer film and a full visco-elastic characterization is presented.

Softness Measurement Technics of Human Skin by Indentation Devices Imitating Palpation

2013 ◽  
Author(s):  
Atsushi Sakuma
Keyword(s):  
Young’S Modulus ◽  
Human Skin ◽  
Soft Tissues ◽  
Young's Modulus ◽  
Finite Thickness ◽  
The Body ◽  
Ultraviolet Rays ◽  
Spherical Indentation ◽  
Measurement Technology ◽  
Human Face

The characteristics of human skin are easily changed by the states of the body because it is very sensitive to environmental transformation. And the development of the condition measurement technology of human skin is very important for improvement in QOL because it reflects body condition. Then, various devices for the condition measurement of human skin had been developed but there was no technique which can evaluate the skin by objective parameter easily. In this paper, spherical indentation testing is studied to evaluate the dimension and rigidity of thin soft-tissues like human skin. Here, the Hertz contact theory is functionally expanded to evaluate indentations for the thin tissues. In the expansions, the technique used for evaluating the thickness of finite specimens is first explained by analyzing the experimental results of indentations. Then, the Young’s modulus of the tissue with finite thickness is theoretically derived by defining an equivalent indentation strain for the analysis of the indentation process. The expansions are examined to evaluate its reliability by applying them to measure Young’s modulus of some thin materials. Furthermore, this technology is applied to the elasticity investigation of the human skin. Especially, the measurement results of elasticity characteristics of the skin of human face are shown as the first report. The influences of sex and ultraviolet rays and so on are discussed to reveal the mechanics of human skin in this report. Moreover, it is discussed about the validity of the device which measures the elasticity of the skin of human face.

Handy-Device Development of Softness Measurement by Indentation Imitating Palpation for Evaluation of Elasticity and Visco-Elasiticity

2015 ◽  
Author(s):  
Atsushi Sakuma
Keyword(s):  
Human Body ◽  
Finite Thickness ◽  
Soft Materials ◽  
The Body ◽  
Hertzian Contact ◽  
Spherical Indentation ◽  
Device Development ◽  
Measurement Results ◽  
Deformation Mechanics ◽  
Hertzian Contact Theory

Spherical indentation testing is studied to evaluate the viscoelasticity of soft materials like human body. Here, the Hertzian contact theory is functionally extended to evaluate indentations for the thin tissues. In the expansions, the technique used for evaluating the thickness of finite specimens is first explained by analyzing the experimental results of indentations. Then, the viscoelasticity of soft materials with finite thickness is theoretically derived by defining an equivalent indentation strain for the analysis of the indentation process. The expansions are examined to evaluate its reliability by applying them to measure the viscoelasticity of some soft materials. Furthermore, this technology is applied to the elasticity investigation of the human body. Especially, the measurement results of viscoelastic characteristics of the body of human body are shown and the availability of developed device is discussed to reveal the deformation mechanics of human body in this report.

Viscoelasticity Measurement of Softness by Indentation Devices for Evaluation of Human Skin

2014 ◽  
Author(s):  
Atsushi Sakuma ◽  
Yuma Sango
Keyword(s):  
Human Skin ◽  
Finite Thickness ◽  
Soft Materials ◽  
Hertzian Contact ◽  
Contact Theory ◽  
Ultraviolet Rays ◽  
Spherical Indentation ◽  
Human Face ◽  
Measurement Results ◽  
Hertzian Contact Theory

In this paper, spherical indentation testing is studied to evaluate the viscoelasticity of soft materials like human skin. Here, the Hertzian contact theory is functionally extended to evaluate indentations for the thin tissues. In the expansions, the technique used for evaluating the thickness of finite specimens is first explained by analyzing the experimental results of indentations. Then, the viscoelasticity of soft materials with finite thickness is theoretically derived by defining an equivalent indentation strain for the analysis of the indentation process. The expansions are examined to evaluate its reliability by applying them to measure the viscoelasticity of some soft materials. Furthermore, this technology is applied to the elasticity investigation of the human skin. Especially, the measurement results of viscoelastic characteristics of the skin of human face are shown as the first report. The influences of sex and ultraviolet rays and so on are discussed to reveal the mechanics of human skin in this report. Moreover, it is discussed about the validity of the device which measures the elasticity of the skin of human face.

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