Universal Mechanical Tester
Universal Mechanical Tester - Related Videos
07:32
Newton's Law of Universal Gravitation
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2023
Source: Ketron Mitchell-Wynne, PhD, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Legend states that Isaac Newton saw an apple fall from a tree. He noticed the acceleration of the apple and deduced that there must have been a force acting upon the apple. He then surmised that if gravity can act at the top of the tree, it can also act at even larger distances. He observed the motion of the moon and the orbits of the...
11:38
Environmentally-controlled Microtensile Testing of Mechanically-adaptive Polymer Nanocomposites for ex vivo Characterization
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Cited by 9 •
2013
A method is discussed by which the in vivo mechanical behavior of stimuli-responsive materials is monitored as a function of time. Samples are tested ex vivo using a microtensile tester with environmental controls to simulate the physiological environment. This work further promotes understanding the in vivo behavior of our material.
12:45
Mechanical Stimulation of Chondrocyte-agarose Hydrogels
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Cited by 29 •
2012
The biosynthesis of cartilaginous extracellular matrix by chondrocytes can be affected by application of mechanical stimuli. This method describes the technique of applying dynamic compressive strains to chondrocytes encapsulated in 3D constructs and the evaluation of induced changes in chondrocyte metabolism.
10:35
Bringing the Visible Universe into Focus with Robo-AO
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Cited by 17 •
2013
Light from astronomical objects must travel through the earth's turbulent atmosphere before it can be imaged by ground-based telescopes. To enable direct imaging at maximum theoretical angular resolution, advanced techniques such as those employed by the Robo-AO adaptive-optics system must be used.
15:21
Microfabricated Platforms for Mechanically Dynamic Cell Culture
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Cited by 3 •
2010
In this protocol, we demonstrate the fabrication of a microactuator array of vertically displaced posts on which the technology is based, and how this base technology can be modified to conduct high-throughput mechanically dynamic cell culture in both two-dimensional and three-dimensional culture paradigms.
FAQs
Force and deformation are measured through separate but coordinated signals. A load cell records the applied force, while displacement or strain sensors track how the specimen changes during loading. Pairing these measurements allows the instrument to relate mechanical input to material response, rather than reporting force alone. That coordination is essential for constructing a stress-strain relationship.
The stress-strain relationship connects the applied mechanical force with the resulting deformation, allowing researchers to examine how a material responds as loading proceeds. From this relationship, they can determine elastic modulus, yield strength, and ultimate strength, rather than relying on a single force reading. The same dataset can also indicate how the material approaches fracture.
Using tensile, compressive, or bending loading gives researchers different ways to characterize response to controlled forces. The choice should match the behavior or loading situation they want to study, while force and deformation remain the measured quantities. Comparing modes can therefore broaden characterization across materials whose strength, stiffness, or deformation is not captured by one test alone.
Defined test conditions give each stress-strain result a clear measurement context. Because material response is evaluated under a controlled loading arrangement, researchers can interpret values such as stiffness or strength in relation to how the test was programmed. Maintaining that defined context is especially important when comparing materials, evaluating engineered designs, or using measurements for quality control.
A measurement generally involves choosing tensile, compressive, or bending loading, programming the mechanical force, and monitoring the response as the test proceeds. The load cell records force while displacement or strain sensors track deformation. Researchers then use the resulting stress-strain relationship to determine relevant properties, including stiffness, strength, and fracture behavior.
Different features of the measured response support different interpretations. Elastic modulus describes stiffness, while yield strength and ultimate strength characterize important strength levels. The later response can reveal fracture behavior. Considering these outcomes together gives a more complete picture of material performance than treating one reported value as a complete characterization.
Researchers apply the measurements to material selection, quality control, structural design, and development of metals, polymers, composites, and other engineered materials. In physics and materials research, the results provide quantitative evidence for comparing how candidate materials carry force and deform. This makes the instrument useful both for studying material behavior and for evaluating materials for design or production needs.