Evaluation Method of Micro-Debonding Defects in FMLs Based on Local Defect Resonance

Damage shape	LDR frequency /kHz
Damage shape	Equivalent damage radius of 0.5 mm	Equivalent damage radius of 0.75 mm	Equivalent damage radius of 1 mm	Equivalent damage radius of 1.5 mm	Equivalent damage radius of 2 mm
Average value	464.6	195.2	116.8	60.3	31.0
Circular	466.8	198.7	120.1	63.0	31.5
Irregular shape	458.7	200.2	126.0	58.8	29.9
Triangle	450.6	188.6	109.3	60.6	29.6
Square	482.2	193.1	111.7	58.9	33.0

Table 2. Simulated and experimental results under different detection conditions
View table
Table 2. Simulated and experimental results under different detection conditions
Parameter Simulated value Experimental value
Not at LDR At LDR Not at LDR At LDR
$β_{2}$ 0.3 0.663 0.24 0.54
$β^{'}$ 7.4 15.5 2.6 5.8
Growth rate of $β_{2}$ 121% 125%
Growth rate of $β^{'}$ 109% 123%

Table 3. Preset and estimated damage equivalent radius of each group of specimens
View table
Table 3. Preset and estimated damage equivalent radius of each group of specimens
Group number Preset equivalent damage radius /mm Estimated equivalent damage radius /mm
1 0.5 0.521
2 0.75 0.803
3 1 1.039
4 1.5 1.446
5 2 2.020

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Xianglin Zhan, Shuwen Li. Evaluation Method of Micro-Debonding Defects in FMLs Based on Local Defect Resonance[J]. Laser & Optoelectronics Progress, 2021, 58(23): 2316001

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Paper Information

Category: Materials

Received: Jan. 25, 2021

Accepted: Mar. 17, 2021

Published Online: Nov. 19, 2021

The Author Email: Li Shuwen (suvenii@sina.com)

DOI:10.3788/LOP202158.2316001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. LDR frequency of each specimen with different damage sizes

Table 1. LDR frequency of each specimen with different damage sizes

Table 2. Simulated and experimental results under different detection conditions

Table 2. Simulated and experimental results under different detection conditions

Table 3. Preset and estimated damage equivalent radius of each group of specimens

Table 3. Preset and estimated damage equivalent radius of each group of specimens