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Relative laser shock strength characterization method

A technology of laser shock and strength, which is applied in the direction of material analysis, force/torque/power measuring instrument, measuring device, etc. by optical means, can solve the problem of long detection time of residual stress size and residual stress depth distribution, limited development and application, Expensive experiments and other problems, to achieve the effect of simple principle, low process cost and fast speed

Active Publication Date: 2014-04-09
JIANGSU UNIV
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Problems solved by technology

At present, most of the characterization of the laser shock intensity relies on the laser shock target with the same parameters, the detection of the residual stress of the target strengthening layer and the depth distribution of the residual compressive stress, and the measurement of the corresponding laser shock strength according to the deformation after laser shock. As a result, these measurement methods are cumbersome, expensive, and the detection time of residual stress and residual stress depth distribution is long and the accuracy is not high, which limits the development and application of laser shock forming and laser shock strengthening to a certain extent.

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example 1

[0029] Select a target with a mass of 5g, the material is 45 steel, and the length of the cycloid is 750mm. The experiment uses a single-pulse neodymium glass laser with a wavelength of 1.06μm, a pulse width of 20ns, and a laser energy of 27.5J. The side of the target is coated with There is 0.1mm black paint (14), apply a small amount of glycerin (13) on the black paint, attach the constraining layer (12) to the side, choose K9 glass for the constraining layer (12), and position and support it through the positioning support frame (6) , the target (11) is in critical contact with the support frame, adjust the laser parameters, the impact path and the position of the pendulum support to ensure that the laser impact point coincides with the center of gravity of the target. After all the preparatory conditions are completed, the central processing unit (1) issues an instruction to make the laser (3) emit a pulsed laser beam through the laser controller (2), and the laser beam pas...

example 2

[0031] Select two targets of different materials, namely: metal target (aluminum alloy) and non-metal target (PVC), the length of the cycloid is 750mm, and the laser shock parameters are the same as in Example 1, that is, the single-pulse neodymium glass is used The laser has a wavelength of 1.06 μm, a pulse width of 20 ns, and a laser energy of 27.5 J. The thickness of the black paint coating on the target is 0.1 mm. The constrained layer K9 glass is the same size and specification as Example 1, and the external conditions are guaranteed to be the same. The central processing unit (1) issues instructions, and the laser controller (2) causes the laser (3) to emit pulsed laser beams to impact each target respectively. The corresponding impulse P of the aluminum alloy is calculated with the same measurement method as in Example 1. 铝 =4.125×10 -3 N.S, PVC target corresponding impulse P PVI =5.775×10 -3 N.S.

[0032] Select 45 steel as the standard target, compare the impact st...

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Abstract

The invention relates to the field of laser processing and manufacturing, in particular to a relative laser shock strength characterization method which is realized by utilizing laser to shock on a single pendulum bob. The relative laser shock strength characterization method is used for guiding laser shock forming, laser shock processing and measurement of working states of a laser system so that the optimum shock effect of laser shock processing can be achieved. The method includes the steps of adopting a high-power pulse laser to shock on the pendulum bob through a reflector path system and to enable the pendulum bob to obtain impulse, measuring the laser shock strength according to the impulse of the pendulum bob and measuring the laser shock strength of targets made of different materials under a unified standard, and utilizing laser shock relative strength coefficients to characterize the diversity of different laser shock strength effects. Consequently, laser shock strength characterization is achieved. Meanwhile, the stability and continuity of the working states of the laser system can be measured through laser impulse, and on this basis, parameters of the laser work system can be adjusted. Through the relative laser shock strength characterization method, operation is convenient, accuracy is high and the use effect is good.

Description

technical field [0001] The invention relates to the field of laser processing, in particular to a method for measuring laser impact intensity by laser shocking a single pendulum pendulum through the magnitude of the impulse of the single pendulum pendulum. Background technique [0002] Laser technology is a brand-new science and technology that emerged rapidly in the 1960s, and it is also a comprehensive high-tech with rapid development, many achievements, wide discipline penetration and wide application range in this century. With the development of laser technology, laser shock forming and laser shock strengthening have increasingly become hot topics of research. Its main feature is that it depends on the laser shock wave to act on the target to form an explosive energy wave. After the impact, the target can be shaped and material modified and strengthened. Purpose, the main factor of this effect is the magnitude of the laser shock intensity. Therefore, for a certain mate...

Claims

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Application Information

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IPC IPC(8): G01L5/00G01N21/00
Inventor 姜银方姜文帆李娟潘禺
Owner JIANGSU UNIV
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