Young's modulus is measured within the elastic limit according to Hooke's law, and the deformation is proportional to the force, so it should be carried out within the elastic range. The reading of the scale in the telescope. The smaller the value, the more accurate the measurement and the more accurate the measuring tool, so as to reduce the relative error. Because the relative error is calculated by multiplication and division, the relative error of indirect measurement is equal to the sum of the relative errors of each direct measurement.
Extended data:
Young's modulus of elasticity is one of the bases for selecting materials for mechanical parts, and it is also a commonly used parameter in engineering and technical design. The measurement of Young's modulus is of great significance for studying the mechanical properties of metal materials, optical fiber materials, semiconductors, nano-materials, polymers, ceramics, rubber and other materials, and can also be used in mechanical parts design, biomechanics, geology and other fields.
The methods for measuring Young's modulus generally include stretching method, beam bending method, vibration method and internal friction method. Experimental techniques and methods such as optical fiber displacement sensor, moire fringe, eddy current sensor and wave transmission technology (microwave or ultrasonic wave) have also appeared to measure Young's modulus.
Definition: In the stage of elastic deformation, the sum of stresses of materials should be in direct proportion (that is, it conforms to Hooke's law), and its proportional coefficient is called elastic modulus.
Significance: Elastic modulus can be used as an index to measure the difficulty of elastic deformation of materials. The greater its value, the greater the stress that causes a certain elastic deformation of the material, that is, the greater the stiffness of the material, that is, the smaller the elastic deformation under a certain stress.
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