Pulse Reflection Thickness Measurement of Composite Laminated Structures
A composite material layer, pulse reflection technology, used in measuring devices, instruments, using ultrasonic/sonic/infrasonic waves, etc., can solve the problems of detection limitations, time-consuming, data errors, etc., and achieve the effect of increasing the breadth and
Active Publication Date: 2017-02-22
HARBIN
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Problems solved by technology
In the past, we used mechanical thickness measurement to measure the thickness of composite material parts, that is, use calipers or micrometers to measure thickness, but there are a series of disadvantages when using mechanical thickness measurement: 1) limited by the structure and size of parts
When performing mechanical thickness measurement on a composite material with a complex structure and large size, it is often encountered that the thickness of some complex areas (such as closed areas) cannot be detected, and the use of calipers can only be used for open areas of the part. The detection is carried out within the range of 150mm from the edge, which greatly limits the detection
2) Due to some human reasons, the value read by the mechanical method will cause certain errors in the data, which will affect the judgment of the test result
3) The detection rate is also very low, and it takes a lot of time to detect large parts
Method used
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[0017] The following is an example of a composite laminated structural part of a certain type of machine.
[0018] Step 1: Determine the layup, material and theoretical thickness value of the parts to be inspected that require thickness measurement. The theoretical thickness value is the sum of the product of the number of layup layers of each material and the theoretical thickness of the material (such as a The part is part 1 in Table 1, and the layer of this part is 1G1 3C2 4C1, which means that the part is composed of 1 layer of G1 material, 3 layers of C2 material and 4 layers of C1 material, then the theoretical thickness value of part 1 1×0.241+3×0.218+4×0.104=1.31mm). We know that the layering and other information of all parts of the inspected parts that need to be inspected for thickness are shown in Table 1;
[0019] Table 1
[0020]
[0021] Step 2: Make a comparison test piece. The comparison test piece should be the same or similar to the material, curing par...
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The invention belongs to a method for measuring the thickness of a composite material member by use of an ultrasonic pulse reflection method. According to the invention, the thickness of the composite material member is measured by use of the ultrasonic pulse reflection method such that the universality of detection objects, the reliability of detection results and the efficiency are improved, and when the thickness of a part which has a quite complex structure and quite large dimension is measured, the situation that some areas cannot be detected does not occur. Compared to a mechanical thickness measuring method, the method provided by the invention has the following advantages: the obtained thickness measuring values are closer to real values, since the method involves digital detection, the thickness value of a detected position can be directly displayed on an instrument, and there are fewer influences of manual factors.
Description
technical field [0001] The invention belongs to a method for detecting the thickness of a composite material part by adopting the principle of an ultrasonic pulse reflection method. Background technique [0002] At present, composite materials are more and more widely used in various industries. Our factory is an important base for the production of composite material parts. Many models use a large number of composite material parts. For these composite material parts, thickness testing is often required. To ensure the weight control of the product, etc. In the past, we used mechanical thickness measurement to measure the thickness of composite material parts, that is, use calipers or micrometers to measure thickness, but there are a series of disadvantages when using mechanical thickness measurement: 1) It is limited by the structure and size of parts. When performing mechanical thickness measurement on a composite material with a complex structure and large size, it is of...
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IPC IPC(8): G01B17/02
Inventor 李英杰
Owner HARBIN