Russia uses ultrasonic waves to measure the elastic modulus of carbon fiber tows
In the past, the well-known method of measuring the elastic modulus of carbon fiber was to use high-precision instruments to record the tension and deformation process of carbon fiber, draw a curve table, and calculate the elastic modulus according to the tension-deformation formula. This is complicated. , time-consuming and expensive, and it is impossible to analyze the fiber structure during the relaxation process.
The Russian test uses ultrasonic method to measure the elastic modulus of carbon fiber (tow), which is to measure the physical value of the fiber itself, that is, the transmission time of the elastic wave on the fiber. The principle is to use an ultrasonic transmitter to emit ultrasonic waves from one end of the fiber without contact. The ultrasonic receiving sensor at the other end of the fiber receives the signal and measures the time it takes for the ultrasonic waves to travel between the transmitter and the receiver. The calculation formula is:
The distance between the transmitter and the receiver
Elastic modulus = fiber density × (————————————)2 This method measures three types of polyacrylonitrile-based carbon fiber tows without contact or damage. The minimum length of the tow required for measurement is 5cm, which is much lower than other measurement methods. The measurement results are not directly related to the strength value and tensile value of the tow. This method can not only measure the elastic modulus of the initial carbon fiber tow, but also determine the elastic modulus of the tow in the composite material. It can indirectly measure the elastic properties of the tow when it is moving, and can also measure the local structure of the tow product. Modulus of elasticityAAVEGTRHYTJ
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