Hysteresis measurements and dynamic mechanical characterization of functionally graded natural rubber-carbon black composites

2009 ◽  
Vol 50 (5) ◽  
pp. 871-877 ◽  
Author(s):  
S.S. Ahankari ◽  
Kamal K. Kar
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Mechanical Characterization ◽  
Functionally Graded ◽  
Dynamic Mechanical

scholarly journals Role of smooth muscle activation in the static and dynamic mechanical characterization of human aortas

2022 ◽  
Vol 119 (3) ◽  
pp. e2117232119
Author(s):  
Giulio Franchini ◽  
Ivan D. Breslavsky ◽  
Francesco Giovanniello ◽  
Ali Kassab ◽  
Gerhard A. Holzapfel ◽  
...  
Keyword(s):  
Experimental Data ◽  
Smooth Muscle ◽  
Muscle Activation ◽  
Mechanical Response ◽  
Mechanical Characterization ◽  
Viscoelastic Behavior ◽  
Material Model ◽  
Suitable Material ◽  
Dynamic Mechanical

Experimental data and a suitable material model for human aortas with smooth muscle activation are not available in the literature despite the need for developing advanced grafts; the present study closes this gap. Mechanical characterization of human descending thoracic aortas was performed with and without vascular smooth muscle (VSM) activation. Specimens were taken from 13 heart-beating donors. The aortic segments were cooled in Belzer UW solution during transport and tested within a few hours after explantation. VSM activation was achieved through the use of potassium depolarization and noradrenaline as vasoactive agents. In addition to isometric activation experiments, the quasistatic passive and active stress–strain curves were obtained for circumferential and longitudinal strips of the aortic material. This characterization made it possible to create an original mechanical model of the active aortic material that accurately fits the experimental data. The dynamic mechanical characterization was executed using cyclic strain at different frequencies of physiological interest. An initial prestretch, which corresponded to the physiological conditions, was applied before cyclic loading. Dynamic tests made it possible to identify the differences in the viscoelastic behavior of the passive and active tissue. This work illustrates the importance of VSM activation for the static and dynamic mechanical response of human aortas. Most importantly, this study provides material data and a material model for the development of a future generation of active aortic grafts that mimic natural behavior and help regulate blood pressure.

Thermo-mechanical characterization of laser textured LaMgAl11O19/YSZ functionally graded thermal barrier coating

2017 ◽  
Vol 321 ◽  
pp. 146-155 ◽  
Author(s):  
Muhammed Anaz Khan ◽  
Muthukannan Duraiselvam ◽  
S.S. Panwar ◽  
Trilochan Jena ◽  
S.R. Dhineshkumar
Keyword(s):  
Thermal Barrier Coating ◽  
Mechanical Characterization ◽  
Functionally Graded ◽  
Thermal Barrier ◽  
Barrier Coating

Characterization of Snap-On Calf Nipple Product and Development of its Compound Formulation Based on Natural Rubber

2017 ◽  
Vol 744 ◽  
pp. 282-287
Author(s):  
Sarawut Prasertsri ◽  
Sansanee Srichan
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Calcium Carbonate ◽  
Carbon Black ◽  
Natural Rubber ◽  
Soxhlet Extraction ◽  
Rubber Compound ◽  
Rubber Compounds ◽  
Rubber Component

This research aimed to develop the formulation of natural rubber filled with carbon black, silica and calcium carbonate for rubber calf nipple application. The reverse engineering was performed on the calf nipple product to analyze the rubber type and component by using Soxhlet extraction, thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) techniques. Furthermore, mechanical properties were examined to act as benchmark for the rubber compound design. The results showed that rubber component in the nipple product was natural rubber, whereas two filler types revealed as carbon black and calcium carbonate with 10 and 35 of the total weight. In addition, rubber nipple showed the hardness of 46±1 Shore A and tensile strength of 5.3±0.60 MPa. From the investigation of the properties of developed rubber compounds in this work, it was found that the mechanical properties depended on type and content of filler. The required mechanical properties of vulcanizates were achieved at 20 phr of carbon black (N330), 20 phr of silica and 120 phr of calcium carbonate.

Thermal and dynamic-mechanical characterization of rice-husk filled polypropylene composites

2009 ◽  
Vol 17 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Simone M. L. Rosa ◽  
Sônia M. B. Nachtigall ◽  
Carlos A. Ferreira
Keyword(s):  
Rice Husk ◽  
Mechanical Characterization ◽  
Polypropylene Composites ◽  
Dynamic Mechanical

Preparation and Characterization of Natural Rubber Composites Comprising Conductive Carbon Black/Magnetite Hybrid Fillers Obtained by Impregnation Technology

2016 ◽  
Vol 55 (13) ◽  
pp. 1344-1356
Author(s):  
Ahmed A. Al-Ghamdi ◽  
Omar A. Al-Hartomy ◽  
Falleh R. Al-Solamy ◽  
Nikolay Dishovsky ◽  
Diana Zaimova ◽  
...  
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Rubber Composites ◽  
Conductive Carbon Black ◽  
Hybrid Fillers ◽  
Natural Rubber Composites
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