To better understand the physical processes of multi-pulse laser drilling,this study investigates the keyhole evolution and its driving mechanism in a time-resolved observation system.The evolution characteristics sug...To better understand the physical processes of multi-pulse laser drilling,this study investigates the keyhole evolution and its driving mechanism in a time-resolved observation system.The evolution characteristics suggested a two-phase process of rapid penetration followed by moderate penetration.As revealed in the ejection and vaporization behavior,the keyhole evolution was dominated by ejection and vaporization during the rapid and moderate penetration stages,respectively.In a single laser-pulsed drilling experiment,the driving mechanism itself was found to be affected by the dimensionless laser power density.The effect of dimensionless laser power density on depth increment was then discussed by comparing the experimental observations with numerical simulation results.The results further confirmed the driving mechanism of the keyhole evolution.The results in this paper are useful for understanding the driving mechanism of the keyhole evolution during multi-pulse laser drilling.展开更多
Thermal fatigue is the typical failure mode of high-temperature combustion chamber components used in power plants and in the aerospace and transportation industries [1-3]. With growing demand for good performance and...Thermal fatigue is the typical failure mode of high-temperature combustion chamber components used in power plants and in the aerospace and transportation industries [1-3]. With growing demand for good performance and high reliability, thermal fatigue is becoming a serious problem. The thermal working conditions of combustion chamber components include start-stop cycles and routine working cycles simultaneously [4,5]. The former refer to large temperature changes, with the amplitude of 200℃-500℃ and time period of several hundred seconds that are responsible for low-cycle fatigue （LCF） damage. The latter correspond to low temperature amplitudes of 20℃-60℃, with time period of milliseconds, and are responsible for high-cycle fatigue （HCF） damages.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11672304,11502269,11272316,and 11272317)the Plan of Beijing Municipal Commission of Science and Technology(Grant No.Z181100003818015)
文摘To better understand the physical processes of multi-pulse laser drilling,this study investigates the keyhole evolution and its driving mechanism in a time-resolved observation system.The evolution characteristics suggested a two-phase process of rapid penetration followed by moderate penetration.As revealed in the ejection and vaporization behavior,the keyhole evolution was dominated by ejection and vaporization during the rapid and moderate penetration stages,respectively.In a single laser-pulsed drilling experiment,the driving mechanism itself was found to be affected by the dimensionless laser power density.The effect of dimensionless laser power density on depth increment was then discussed by comparing the experimental observations with numerical simulation results.The results further confirmed the driving mechanism of the keyhole evolution.The results in this paper are useful for understanding the driving mechanism of the keyhole evolution during multi-pulse laser drilling.
基金supported by the National Natural Science Foundation of China(Grant Nos.11272316,11502269,11672304,and 11272317)the Instrument-Developing Project of the Chinese Academy of Sciences(Grant No.yz201636)
文摘Thermal fatigue is the typical failure mode of high-temperature combustion chamber components used in power plants and in the aerospace and transportation industries [1-3]. With growing demand for good performance and high reliability, thermal fatigue is becoming a serious problem. The thermal working conditions of combustion chamber components include start-stop cycles and routine working cycles simultaneously [4,5]. The former refer to large temperature changes, with the amplitude of 200℃-500℃ and time period of several hundred seconds that are responsible for low-cycle fatigue （LCF） damage. The latter correspond to low temperature amplitudes of 20℃-60℃, with time period of milliseconds, and are responsible for high-cycle fatigue （HCF） damages.
