Journal ArticleDOI
Single speciment determination of young's and bulk moduli of polymers
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TLDR
In this paper, a method for the rapid and consecutive determination of the Young's and bulk moduli of polymeric solids in compression loading is presented, where an undersized sample in a standard bulk compressibility tester is used to determine both moduli on the same specimen in a single test procedure.Abstract:
A new method is presented for the rapid and consecutive determination of theYoung's and bulk moduli of polymeric solids in compression loading. Usually these properties are determined by separate measurements. However, by using an undersized specimen in a standard bulk compressibility tester, it is possible to determine both moduli on the same specimen in a single test procedure. Initial loading of the undersized specimen results in a decrease in length and an increase in diameter. From these changes,Young's modulus may be calculated. Once the bore of the tester is filled, the application of additional pressure results in a decrease in the volume of the polymer from which the bulk modulus may be calculated. Both determinations may be made within minutes. The moduli values are in general agreement with published values and the calculated values for Poisson's ratio fall into the expected range.read more
Citations
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Journal ArticleDOI
Correlation of filler content and elastic properties of resin-composites.
TL;DR: Elastic moduli varied significantly and a positive correlation existed between elastic moduli and filler volume-fraction (r2: 0.905-0.992 and 0.940-1.000 for Young's and bulk moduli, respectively).
Journal ArticleDOI
Butylated melamine formaldehyde as a durable and highly positive friction layer for stable, high output triboelectric nanogenerators
Sung Soo Kwak,SeongMin Kim,Hanjun Ryu,Jihye Kim,Usman Khan,Hong-Joon Yoon,Yo Han Jeong,Sang-Woo Kim +7 more
TL;DR: In this article, butylated melamine formaldehyde (BMF) is proposed as a promising triboelectric material because of both its mechanical durability and its highly positive properties.
Journal ArticleDOI
Effect of filler size and shape on local nanoindentation modulus of resin-composites
TL;DR: Filler-size and shape seemed to be fine-tuning factors for E, and strong quadratic correlations were observed between E and filler-size for unimodal materials with spherical and irregular fillers, but were not statistically significant.
Journal ArticleDOI
Measurement at low strain rates of the elastic properties of dental polymeric materials.
TL;DR: This test does fulfil a requirement for a simple test to define fully the elastic properties of dental polymeric materials and has implications for FEA, in that analysis is concerned with static or slow rate loading situations.
Journal ArticleDOI
Characterisation of alginate gels using quasi-static and dynamic methods
Mauro Moresi,Maria Bruno +1 more
TL;DR: In this article, the rheological behavior of the calcium salts of several commercial mannuronic and guluronic alginates in the time and frequency domain was assessed by quasi-static (uniaxial compression and compressive stress relaxation) and oscillatory dynamic tests.
References
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Book
Viscoelastic properties of polymers
TL;DR: In this article, the authors describe the nature of Viscoelastic behavior of polymeric systems and approximate relations among the linear Viscoels and approximate interrelations among the Viscelastic Functions.
Book
Formulas for Stress and Strain
TL;DR: In this article, the authors propose formulas for stress and strain in the form of formulas for strain and stress, which are derived from the formula for stress-and-stress and strain.