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Young's modulus is a mechanical property of solid materials that measures the tensile or compressive stiffness when the force is applied lengthwise. It is the modulus of elasticity for tension or axial compression. Young's modulus is defined as the ratio of the stress applied to the object and the resulting axial strain in the linear elastic region of the material.
Ultimate tensile strength is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials, the ultimate tensile strength is close to the yield point, whereas in ductile materials, the ultimate tensile strength can be higher.
Coercivity, also called the magnetic coercivity, coercive field or coercive force, is a measure of the ability of a ferromagnetic material to withstand an external magnetic field without becoming demagnetized. Coercivity is usually measured in oersted or ampere/meter units and is denoted HC.
Graphene is an allotrope of carbon consisting of a single layer of atoms arranged in a hexagonal lattice nanostructure. The name is derived from "graphite" and the suffix -ene, reflecting the fact that the graphite allotrope of carbon contains numerous double bonds.
Indentation hardness tests are used in mechanical engineering to determine the hardness of a material to deformation. Several such tests exist, wherein the examined material is indented until an impression is formed; these tests can be performed on a macroscopic or microscopic scale.
Nanotribology is the branch of tribology that studies friction, wear, adhesion and lubrication phenomena at the nanoscale, where atomic interactions and quantum effects are not negligible. The aim of this discipline is characterizing and modifying surfaces for both scientific and technological purposes.
In materials science, hardness is a measure of the resistance to localized plastic deformation, such as an indentation or a scratch (linear), induced mechanically either by pressing or abrasion. In general, different materials differ in their hardness; for example hard metals such as titanium and beryllium are harder than soft metals such as sodium and metallic tin, or wood and common plastics. Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, hardness can be measured in different ways, such as scratch hardness, indentation hardness, and rebound hardness. Hardness is dependent on ductility, elastic stiffness, plasticity, strain, strength, toughness, viscoelasticity, and viscosity. Common examples of hard matter are ceramics, concrete, certain metals, and superhard materials, which can be contrasted with soft matter.
Nanoindentation, also called instrumented indentation testing, is a variety of indentation hardness tests applied to small volumes. Indentation is perhaps the most commonly applied means of testing the mechanical properties of materials. The nanoindentation technique was developed in the mid-1970s to measure the hardness of small volumes of material.
The Shore durometer is a device for measuring the hardness of a material, typically of polymers.
Alex K. Zettl is an American experimental physicist, educator, and inventor.
Mechanical metamaterials are artificial materials with mechanical properties that are defined by their mesostructure in addition to than their composition. They can be seen as a counterpart to the rather well-known family of optical metamaterials. They are often also termed elastodynamic metamaterials and include acoustic metamaterials as a special case of vanishing shear. Their mechanical properties can be designed to have values which cannot be found in nature.
Yang Yang is a Taiwanese-American materials scientist. He is a Professor of Materials Science and Engineering, and Professor of Bioengineering at the University of California, Los Angeles, where he holds the Carol and Lawrence E. Tannas Jr. Endowed Chair in Engineering. Yang is known for his contributions to polymer organic solar cells and lead-halide perovskite solar cells. He was named as one of the "World’s Most Influential Scientific Minds" by Thomson Reuters in 2016. Yang is a fellow of the American Association for the Advancement of Science, American Physical Society, Materials Research Society, Royal Society of Chemistry, and Society of Photo-Optical Instrumentation Engineers.
In materials science, the term single-layer materials or 2D materials refers to crystalline solids consisting of a single layer of atoms. These materials are promising for some applications but remain the focus of research. Single-layer materials derived from single elements generally carry the -ene suffix in their names, e.g. graphene. Single-layer materials that are compounds of two or more elements have -ane or -ide suffixes. 2D materials can generally be categorized as either 2D allotropes of various elements or as compounds.
Germanene is a material made up of a single layer of germanium atoms. The material is created in a process similar to that of silicene and graphene, in which high vacuum and high temperature are used to deposit a layer of germanium atoms on a substrate. High-quality thin films of germanene have revealed unusual two-dimensional structures with novel electronic properties suitable for semiconductor device applications and materials science research.
Xue Qikun is a Chinese physicist. He is a professor of Tsinghua University, Beijing. He has done much work in Condensed Matter Physics, especially on superconductors and topological insulators. In 2013, Xue was the first to achieve the quantum anomalous Hall effect (QAHE), an unusual orderly motion of electrons in a conductor, in his laboratory at Tsinghua University. Xue is a member of the Chinese Academy of Sciences, vice president for research of Tsinghua University, and director of State Key Lab of Quantum Physics. In 2016, he was one of the first recipients of the new Chinese Future Science Prize for experimental discovery of high-temperature superconductivity at material interfaces and the QAHE. This award has been described as "China's Nobel Prize".
Chang Chun-yen was a Taiwanese academic administrator and electrical engineer who served as President of National Chiao Tung University (NCTU).
Tsu-Jae King Liu is an American academic and engineer who serves as the Dean and the Roy W. Carlson Professor of Engineering at the UC Berkeley College of Engineering.
Elisa Riedo is a physicist and researcher known for her contributions in condensed matter physics, nanotechnology and engineering. She is the Herman F. Mark Chair Professor of Chemical and Biomolecular Engineering at the New York University Tandon School of Engineering and the director of the picoForce Lab.
Indentation plastometry is the idea of using an indentation-based procedure to obtain (bulk) mechanical properties in the form of stress-strain relationships in the plastic regime. Since indentation is a much easier and more convenient procedure than conventional tensile testing, with far greater potential for mapping of spatial variations, this is an attractive concept.
References
- 1 2 3 "Yang-Tse Chang". uky.edu. Retrieved December 27, 2017.
- ↑ "UK Professor Named Fellow of the National Academy of Inventors". uky.edu. Retrieved December 27, 2017.
- ↑ "Y.T. Cheng". uky.edu. Retrieved December 27, 2017.
- ↑ Yang-Tse Cheng, Che-Min Cheng. Scaling, dimensional analysis, and indentation measurements. 44:4. Materials Science and Engineering: R: Reports. 2004
- ↑ "Yang-Tse Chang" . Retrieved December 27, 2017.