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Thermomechanical response of aluminum alloys under the combined action of tensile loading and laser irradiations
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作者 Mohsan Jelani Zewen Li +1 位作者 Zhonghua Shen Maryam Sardar 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第3期469-480,共12页
This study reports the investigation of the thermomechanical behavior of aluminum alloys (AI-1060, A1-6061, and A1-7075) under the combined action of tensile loading and laser irradiations. The continuous wave ytter... This study reports the investigation of the thermomechanical behavior of aluminum alloys (AI-1060, A1-6061, and A1-7075) under the combined action of tensile loading and laser irradiations. The continuous wave ytterbium fiber laser (wavelength 1080 nm) was employed as the irradiation source, while tensile loading was provided by the tensile testing machine. The effects of various pre-loading and laser power densities on the failure time, temperature distribution, and the deformation behavior of aluminum alloys are analyzed. The experimental results represent the significant reduction in failure time for higher laser power densities and for high preloading values, which implies that preloading may contribute a significant role in the failure of the material at elevated temperature. Fracture on a microscopic scale was predominantly ductile comprising micro-void nucleation, growth, and coalescence. The AI-1060 specimens behaved plastically to some extent, while A1-6061 and A1-7075 specimens experienced catastrophic failure. The reason and characterization of ma- terial failure by tensile and laser loading are explored in detail. A comparative behavior of under-tested materials is also investigated. This work suggests that studies considering only combined loading are not enough to fully understand the mechanical behavior of under-tested materials. For complete characterization, one should consider the effect of heating as well as loading rate and the corresponding involved processes with the help of thermomechanical coupling and the thermal elastic-plastic theory. 展开更多
关键词 aluminum alloys fiber laser tensile loading thermomechanical effects failure evolution
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Numerical simulation and experimental investigation of Ti-6Al-4V melted by CW fiber laser at different pressures
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作者 Aasma Tabassum ZHOU Jie +2 位作者 HAN Bing NI Xiao-wu Maryam Sardar 《Optoelectronics Letters》 EI 2017年第4期299-303,共5页
The interaction of continuous wave (CW) fiber laser with Ti-6A1-4V alloy is investigated numerically and experi- mentally at different laser fluence values and ambient pressures of N2 atmosphere to determine the mel... The interaction of continuous wave (CW) fiber laser with Ti-6A1-4V alloy is investigated numerically and experi- mentally at different laser fluence values and ambient pressures of N2 atmosphere to determine the melting time threshold of Ti-6A1-4V alloy.' A 2D-axisymmetric numerical model considering heat transfer and laminar flow is es- tablished to describe the melting process. The simulation results indicate that material melts earlier at lower pressure (8.0 Pa) than at higher pressure (8.8x 104 Pa) in several milliseconds with the same laser fluence. The experimental results demonstrate that the melting time threshold at high laser fluence (above 1.89x 108 W/m2) is shorter for lower pressure (vacuum), which is consistent with the simulation. While the melting time threshold at low laser fluence (below 1.89x 108 W/m2) is shorter for higher pressure. The possible aspects which can affect the melting process in- clude the increased heat loss induced by the heat conduction between the metal surface and the ambient gas with the increased pressure, and the absorption variation of the coarse surface resulted from the chemical reaction. 展开更多
关键词 Aluminum Fiber lasers Heat conduction Heat transfer Laminar flow MELTING Metal melting Numerical models Ternary alloys Titanium alloys Tungsten alloys Vanadium alloys
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