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Introduction of Hopkinson equipment experimental device

Release time:2019-12-31  Luoyang Liwei Technology Co., Ltd  Browse times:1588

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Introduction of Hopkinson equipment experimental device

Hopkinson rod is a method that has been used in material testing. It can be used to test the dynamic properties of materials. Modern Hopkinson rods use a lot of new testing and measuring technologies, which are used in many industrial fields.

b. The position accuracy of the X / Z axis to realize the x-axis servo motion of the tool holder is also an important precision index, which is directly related to the size dispersion and consistency of the workpiece to be processed. This is a comprehensive precision, involving the precision of ball screw and bearing, servo sensitivity of carriage, matching of servo inertia and load inertia of carriage, etc. In the design, high-precision ball unitary bar and bearing matching kit are selected to match the servo inertia and load inertia reasonably; During assembly, the bearing is preloaded and the ball screw is pretensioned to eliminate the influence of thermal deformation on the accuracy of bearing and ball screw, so as to ensure that the tool holder has good servo sensitivity and high positioning accuracy and repeated positioning accuracy in X / z direction.

4 concluding remarks

It can be seen from the above analysis that in the manufacturing and assembly process of turning milling compound machine tool, as long as the accuracy of electric spindle system, dynamic performance of turning milling compound machine tool, indexing and positioning accuracy and position accuracy of electric tool holder are reasonably solved, the turning milling compound machine tool can have high processing accuracy and accuracy retention.

How does Hopkinson stick work?

Young's modulus is a material constant, which is used to describe the deformation of components in the process of force loading.

The material sample is located between two rods of split Hopkinson rod. A so-called hammer - for example, an accelerating hammer compressed by air - produces pressure waves. The pressure wave passes through * rods, some of which are reflected at the rod end, and the other part reaches the transmission rod through the test sample.

The strain gauge installed on the attached rod and the transmission rod is used to measure the strain produced by the pressure wave. In this way, the amplitude of the attached rod, the transmission rod and the reflected pressure wave can be measured.

Requirements for testing and measuring technology

The Hopkinson rod needs to see the strain gauge installed on the transmission rod and event rod, as well as a powerful data acquisition system. The following is the result of * research: "generally speaking, the * small response frequency of data acquisition system is 100

The genesishighspeedseries data acquisition system from HBM can be used perfectly on the Hopkinson pole. In addition, HBM provides strain gauges mounted on the Hopkinson rod.

What's the difference between static material testing machine and static material testing machine?

Young's modulus is usually obtained by stress-strain curve on a quasi-static testing machine. However, materials usually exhibit significantly different properties under dynamic loading, for example, they may have higher hardness. Therefore, in structural design, engineers must understand the dynamic characteristics of materials. Generally speaking, a simple material testing machine cannot acquire such a high strain rate.

Product details:

Pressure bar test technology

The prototype of Hopkinson compression bar was proposed by Hopkinson in 1914. It can only be used to measure the pulse waveform under impact load.

In 1949, Kolsky improved the device by dividing the compression bar into two sections and placing the specimen in it, so that the device can be used to measure the stress-strain relationship of materials under impact load.


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