Twist Measurement
Twist Measurement - Related Videos
11:41
Magnetic Tweezers for the Measurement of Twist and Torque
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Cited by 16 •
2014
Magnetic tweezers, a powerful single-molecule manipulation technique, can be adapted for the direct measurements of the twist (using a configuration called freely-orbiting magnetic tweezers) and torque (using a configuration termed magnetic torque tweezers) in biological macromolecules. Guidelines for performing such measurements are given, including applications to the study of DNA and associated nucleo-protein filaments.
01:13
Angle of Twist: Problem Solving
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2024
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque exerted...
01:13
Angle of Twist - Elastic Range
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2024
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
11:43
The Fastest Western in Town: A Contemporary Twist on the Classic Western Blot Analysis
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Cited by 30 •
2014
This protocol explores the latest advancements in performing Western blot analyses. These novel modifications employ a Bis-Tris gel system with a 35 min electrophoresis run time, a 7 min dry blotting transfer system, and infrared fluorescent protein detection and imaging that generates higher resolution, quality, sensitivity, and improved accuracy of Western data.
06:24
High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Cited by 3 •
2019
This protocol demonstrates the preparation of a photorheological material that exhibits a solid phase, various liquid crystalline phases, and an isotropic liquid phase by increasing temperature. Presented here are methods for measuring the structure-viscoelasticity relationship of the material.
FAQs
The measured angular displacement provides a response to an applied torque. Comparing that displacement with the known loading condition allows researchers to evaluate torsional stiffness, which describes resistance to rotation about the longitudinal axis. This relationship helps connect an object’s observed deformation with its mechanical response and supports the study of elasticity and material behavior.
The difference between the initial and final angular positions identifies the rotation produced by torsion rather than the object’s original orientation. This comparison establishes the angular displacement associated with the applied torque. Using a change in position also makes measurements applicable to shafts, wires, fibers, and structural components that may begin at different angular alignments.
The object’s size and the sensitivity required for the experiment strongly influence instrument selection. Angular scales can support direct position comparisons, while optical sensors or strain-based instruments may be chosen when the rotation or deformation requires a different measurement approach. Matching the method to the specimen and desired sensitivity improves the usefulness of the recorded response.
First, establish the object’s initial angular position about its longitudinal axis. Next, apply a known torque and determine the resulting final angular position with an angular scale, optical sensor, or strain-based instrument. The angular difference is then related to the applied torque to assess torsional stiffness and characterize the object’s mechanical response.
These approaches provide different ways to determine angular or deformation response. Angular scales compare positions directly, optical sensors detect rotational changes through an optical measurement, and strain-based instruments obtain information from deformation in the object. The choice depends on the specimen’s size and the sensitivity needed, allowing twist measurements to support both larger components and more demanding experiments.
Twist measurements reveal how an object responds mechanically when torque produces rotational deformation. In physics, the results support studies of torsional stiffness, elasticity, and material properties. In materials science and engineering, the same measurements help characterize shafts, fibers, wires, and structural components, linking controlled mechanical loading with experimentally observed deformation.