Characterization of Biaxial Mechanical Properties of Rubber and Skin PDF Download
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Author: Nishamathi Kumaraswamy Publisher: ISBN: Category : Languages : en Pages : 208
Book Description
Breast cancer is one of the most frequently diagnosed cancers affecting women in the United States. An ongoing objective of many research groups is to develop a biomechanical breast model for different applications, ranging from surgical outcome predictions for patients undergoing breast reconstruction surgery, to image registration for planning plastic surgery. Achieving the goal of developing a physics based biomechanical model of the human breast requires the determination of material properties of the various tissues constituting the breast. The objective of this thesis is to develop an appropriate hybrid experimental-numerical technique to enable the calibration of material parameters of skin for different constitutive models (commonly used for skin). The quantification of the material parameters thus obtained validates the bulge test method to be used in testing soft tissue specimens like skin. A bulge test device was custom-built for this work; it consists of a pressure chamber, two digital cameras, and a syringe pump as its main components. The syringe pump provides a constant flow rate of water into the pressure chamber and results in the bulging of specimens with a diameter between 45 mm and 80 mm. Three-dimensional Digital Image Correlation technique is used to obtain full field displacement measurements of the three dimensional shape of the bulge. Tests were performed on commercial rubber sheets of different thickness and on porcine skin specimens; in these tests, the bulge shape was measured at monotonically increasing and decreasing pressure levels, as well as during cyclic loading allowing determination of the deformation and strain fields over the specimen surface. In order to extract the material properties, a hybrid experimental-numerical method was used: the experiment was modeled numerically using the finite element analysis software Abaqus, imposing the commonly used Mooney-Rivlin model for isotropic materials and the Gasser-Ogden-Holzapfel model for anisotropic materials. A comparison between the experimentally measured and numerically simulated bulge shapes was used to determine the optimized material parameters under biaxial loading conditions over a large range of stretch levels.
Author: Nishamathi Kumaraswamy Publisher: ISBN: Category : Languages : en Pages : 208
Book Description
Breast cancer is one of the most frequently diagnosed cancers affecting women in the United States. An ongoing objective of many research groups is to develop a biomechanical breast model for different applications, ranging from surgical outcome predictions for patients undergoing breast reconstruction surgery, to image registration for planning plastic surgery. Achieving the goal of developing a physics based biomechanical model of the human breast requires the determination of material properties of the various tissues constituting the breast. The objective of this thesis is to develop an appropriate hybrid experimental-numerical technique to enable the calibration of material parameters of skin for different constitutive models (commonly used for skin). The quantification of the material parameters thus obtained validates the bulge test method to be used in testing soft tissue specimens like skin. A bulge test device was custom-built for this work; it consists of a pressure chamber, two digital cameras, and a syringe pump as its main components. The syringe pump provides a constant flow rate of water into the pressure chamber and results in the bulging of specimens with a diameter between 45 mm and 80 mm. Three-dimensional Digital Image Correlation technique is used to obtain full field displacement measurements of the three dimensional shape of the bulge. Tests were performed on commercial rubber sheets of different thickness and on porcine skin specimens; in these tests, the bulge shape was measured at monotonically increasing and decreasing pressure levels, as well as during cyclic loading allowing determination of the deformation and strain fields over the specimen surface. In order to extract the material properties, a hybrid experimental-numerical method was used: the experiment was modeled numerically using the finite element analysis software Abaqus, imposing the commonly used Mooney-Rivlin model for isotropic materials and the Gasser-Ogden-Holzapfel model for anisotropic materials. A comparison between the experimentally measured and numerically simulated bulge shapes was used to determine the optimized material parameters under biaxial loading conditions over a large range of stretch levels.
Author: C.A. Brebbia Publisher: WIT Press ISBN: 178466197X Category : Technology & Engineering Languages : en Pages : 421
Book Description
Material and contact characterisation is a rapidly advancing field that requires the application of a combination of numerical and experimental methods. Including papers from the International Conference on Computational Methods and Experiments in Material and Contact Characterisation this volume presents the latest research in the field.
Author: Jerome M. Klosner Publisher: ISBN: Category : Languages : en Pages : 22
Book Description
Biaxial and uniaxial experiments have been conducted on a thin sheet of natural rubber, which can be assumed to be incompressible, isotropic and perfectly elastic. The strain energy function and constitutive equations have been determined, and the material is seen to be of the general Rivlin-Saunders type. Also included is a description of the biaxial testing apparatus which was designed and constructed for use in the general investigation of stress concentration in elastomers. (Author).
Author: Yannick Merckel Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Rubber-like materials are submitted to cyclic loading conditions in various applications. Fillers are always incorporated within rubber compounds. They improve the mechanical properties but induce a significant stress-softening under cyclic loadings. The physical source of the softening is not yet established and its modeling remains a challenge. For a better understanding of the softening, filled rubbers are submitted to cyclic loadings. In order to quantify the effects of the loading intensity and the number of cycles, original methods are proposed to characterize the softening. To study the influence of the material microstructure on the softening, compounds with various compositions are considered.Non proportional tensile tests including uniaxial and biaxial loading paths are applied in order to highlight the softening induced anisotropy. Such unconventional experimental data are used to provide a general criterion for the softening activation. A constitutive modeling grounded on a thorough analysis of experimental data is proposed. The model is based on a directional approach. The Mullins softening is accounted for by the strain amplification concept and is activated by a directional criterion. The model ability to predict non proportional softened material responses is demonstrated.
Author: Susmita Bose Publisher: Elsevier Inc. Chapters ISBN: 0128070951 Category : Science Languages : en Pages : 16
Book Description
This brief introductory chapter provides a broad overview of materials, biomaterials and the need to understand different techniques to characterize biomaterials. From this chapter, the reader can gain a perspective on how the rest of the topics in different chapters are divided to fully comprehend this inherently multidisciplinary field. Application of appropriate characterization tools can not only save time to fully evaluate different biomaterials, it can also make commercial biomedical devices safer. In the long run, safer biomedical devices can only reduce the pain and suffering of mankind, a dream that resonates with every biomedical researcher.
Author: Stephen C. Cowin Publisher: Springer Science & Business Media ISBN: 1402002203 Category : Mathematics Languages : en Pages : 252
Book Description
Cowin (New York Center for Biomedical Engineering) and Humphrey (biomedical engineering, Texas A&M U.) present seven papers that discuss current research and future directions. Topics concern tissues within the cardiovascular system (arteries, the heart, and biaxial testing of planar tissues such as heart valves). Themes include an emphasis on data on the underlying microstructure, especially collagen; the consideration of the fact that both arteries and the heart contain muscle and that there is, therefore, a need to quantify both the active and passive response; constitutive relations for active behavior; and the growth and remodeling of cardiovascular tissues. Of interest to cardiovascular and biomechanics soft tissue researchers, and bioengineers. Annotation copyrighted by Book News, Inc., Portland, OR.
Author: Dai Fei Elmer Ker Publisher: Frontiers Media SA ISBN: 2832554938 Category : Technology & Engineering Languages : en Pages : 140
Book Description
In our rapidly aging society, tendon and ligament injuries pose a tremendous socioeconomic burden with a great impact on mobility and patient quality of life. Understanding tendon/ligament development and maturation, pathogenesis, wound healing, tissue engineering, and regenerative medicine approaches will be crucial. In this collection, we aim to showcase tendon and ligament research that spans the gamut of basic science to pre-clinical translation. These topics include but are not limited to tendon/ligament development and maturation, the pathogenesis of tendon and ligament injury, isolation and modification of stem cells and their products for regenerative medicine, identification and delivery of bioactive tenogenic/ligamentogenic molecules, development and characterization of bioactive and/or mechanically robust biomaterials in silico, in vitro, ex vivo, and in vivo for tissue engineering, as well as the use of novel multidisciplinary methodologies and technologies including systems biology and synthetic biology approaches for studying tendons and ligaments as well as enhancing their repair and regeneration. With this collection, we aim to expose readers to inter- and multi-disciplinary biological and bioengineering techniques and research, which will stimulate broader discussion and advance our understanding to improve tendon/ligament repair and regeneration.
Author: Nishamathi Kumaraswamy
Author: Nishamathi Kumaraswamy
Author: C.A. Brebbia
Author: Jerome M. Klosner
Author: Yannick Merckel
Author: Kenneth B. Cordio
Author: Susmita Bose
Author: 
Author: 
Author: Stephen C. Cowin
Author: Dai Fei Elmer Ker