Journal of Laser Applications最新文献

Research on a visual positioning method of paddy field weeding wheels based on laser rangefinder-camera calibration 基于激光测距仪-摄像机校准的水田除草轮视觉定位方法研究

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-06-03 DOI: 10.2351/7.0001341

Shanshan Wang, Xingsong Wang, Shanshan Yu

引用次数: 0

Material incorporation in powder sheet additive manufacturing toward lightweight designs for future mobility 在粉末片材增材制造中加入材料，实现未来汽车的轻量化设计

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-05-01 DOI: 10.2351/7.0001348

Wenyou Zhang, Daniele Pullini, Matteo Alberghini, A. Bertinetti, Alessio Tommasi, Asli Coban, Seán McConnell, H. Naesstroem, Ramesh Padamati Babu, J. Volpp, Rocco Lupoi

引用次数: 0

Ablative laser propulsion, the propellants and measuring parameters: A brief review 烧蚀激光推进、推进剂和测量参数：简要回顾

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-05-01 DOI: 10.2351/7.0001342

A. Abbas, Syeda Tehreem Iqbal, Yasir Jamil

引用次数: 0

Refining laser-induced dewetting for bimetallic Au–Pd nanoparticle synthesis on ZnO thin films: Optimizing fluence for substrate integrity 改进用于在氧化锌薄膜上合成双金属金-钯纳米粒子的激光诱导露化：优化通量以保证基底完整性

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-05-01 DOI: 10.2351/7.0001326

C. Sánchez-Aké, J. A. Segura-Zavala, O. Depablos-Rivera, M. A. Martínez-Fuentes, T. García-Fernández, S. S. Kanakkillam, Amauri Serrano-Lázaro

{"title":"Refining laser-induced dewetting for bimetallic Au–Pd nanoparticle synthesis on ZnO thin films: Optimizing fluence for substrate integrity","authors":"C. Sánchez-Aké, J. A. Segura-Zavala, O. Depablos-Rivera, M. A. Martínez-Fuentes, T. García-Fernández, S. S. Kanakkillam, Amauri Serrano-Lázaro","doi":"10.2351/7.0001326","DOIUrl":"https://doi.org/10.2351/7.0001326","url":null,"abstract":"We report the fabrication of metal alloy Au–Pd nanoparticles on semiconductor thin film substrates (ZnO) by laser-induced dewetting. Employing a UV excimer laser, a single pulse was directed onto a three-layer film stack on a glass substrate: glass/ZnO/Au/Pd and glass/ZnO/Pd/Au. We simulated the temperature attained by the thin films enabling the prediction of energy thresholds required for melting the metal films but avoiding modifying the ZnO film. A specific range is reported of the pulse energy conducive to nanoparticle formation and the energy threshold required to modify the ZnO film beneath them. Depending on the pulse energy applied, the mean diameter of the nanoparticles varied from approximately 150 to around 70 nm. Notably, higher fluences resulted in smaller particles but also induced surface cracks in the ZnO film. Additionally, we observed a reduction in nanoparticle size with increased Pd content. Our results show that laser-induced dewetting can produce bimetallic alloy nanoparticles and, at the same time, ensure the preservation of the optical properties of the ZnO film. This approach opens avenues for tailoring material characteristics and expanding the range of applications of metal nanoparticles on semiconductor-based systems.","PeriodicalId":50168,"journal":{"name":"Journal of Laser Applications","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141131177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Statistical modeling and optimization of clad geometry in laser cladding of Amdry 961 on Inconel 713LC superalloy with response surface methodology 利用响应面方法对因科镍合金 713LC 超合金上的 Amdry 961 激光熔覆几何形状进行统计建模和优化

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-05-01 DOI: 10.2351/7.0001364

Mahya Hajiahmadi, Ali Khorram, M. Ghoreishi

引用次数: 0

Novel path planning algorithm for laser powder bed fusion to improve the scan quality of triply periodic minimal surface structures 用于激光粉末床融合的新型路径规划算法，可提高三周期最小表面结构的扫描质量

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-05-01 DOI: 10.2351/7.0001147

Huiliang Tang, Jiangzhao Zhang, Chu Wang, Yu Long

{"title":"Novel path planning algorithm for laser powder bed fusion to improve the scan quality of triply periodic minimal surface structures","authors":"Huiliang Tang, Jiangzhao Zhang, Chu Wang, Yu Long","doi":"10.2351/7.0001147","DOIUrl":"https://doi.org/10.2351/7.0001147","url":null,"abstract":"Traditional path planning methods, such as contour and raster methods, suffer from problems like uneven filling, overfilling, and underfilling in the sliced layers, resulting in poor continuity of the lattice melt pool, internal porosity defects, and severe powder adhesion at the contour edges, while research on path planning for three-periodic minimal surfaces lattices is relatively limited. In this study, a scanning path planning method based on lattice equations control is proposed, which differs from traditional contour paths and raster paths. The new paths are controlled by the isosurface parameters of the lattice equation and optimized using the traveling salesman problem, resulting in more uniform scanning paths. The new paths avoid the underfilling issue present in raster path and the sawtooth-shaped borders of raster path. Additionally, they circumvent the nonuniform scanning path problem caused by uneven wall thickness in contour path. Through visualizing the paths and conducting printing experiments on the lattice, it is found that the new path is more uniform compared to contour paths, effectively addressing the issue of overfilling. Compared to raster paths, the new path has smoother boundaries and reduces internal porosity and powder adhesion within the lattice. This research has important value in reducing internal porosity and external powder adhesion issues in three-period minimal surface (TPMS) lattice printing processes, further enhancing the manufacturing quality of TPMS lattices.","PeriodicalId":50168,"journal":{"name":"Journal of Laser Applications","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141033572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evolutions of distortion and residual stress in laser powder bed fusion based on assumption of constraining force 基于约束力假设的激光粉末床熔融过程中的变形和残余应力演变

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-05-01 DOI: 10.2351/7.0001336

Deqiao Xie, Jianfeng Zhao

{"title":"Evolutions of distortion and residual stress in laser powder bed fusion based on assumption of constraining force","authors":"Deqiao Xie, Jianfeng Zhao","doi":"10.2351/7.0001336","DOIUrl":"https://doi.org/10.2351/7.0001336","url":null,"abstract":"Laser powder bed fusion is a promising technique that can produce complex-shaped and integrated part. However, distortion and residual stress are two issues that may decrease the precision and performance of built parts. Classical thermal gradient mechanism offers a basic interpretation toward distortion and residual stress. The evolutions of distortion and residual stress in laser powder bed fusion remain unclear. In this study, we used a physical model with an assumption of constraining force to illustrate the evolutions of distortion and residual stress during the additive process. Based on the model, we are able to understand the phenomenon of X-directional shrinkage, Z-directional distortion, and “tensile-compressive-tensile” distribution of X-directional stresses at the same time. It can be concluded that the shrinkage, distortion, and X-directional residual stress all result from the constraint between previously deposited layer and newly deposited layer, which has a strong shrinkage tendency when cooling. The distortion of part increases with deposition height, especially during first several layers. The “tensile-compressive-tensile” distribution of X-directional stresses can be maintained during the additive process. The magnitude of top tensile stress remains stable, while the tensile stress at bottom increases with the deposition height. This work provides a comprehensive understanding toward the evolutions of distortion and residual stress in laser powder bed fusion.","PeriodicalId":50168,"journal":{"name":"Journal of Laser Applications","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141141302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser hazard classification of a line laser with an astigmatic extended source 带有散光扩展光源的线激光器的激光危害分类

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-05-01 DOI: 10.2351/7.0001260

Wesley J. Marshall, Robert C. Aldrich, Annette Frederiksen

{"title":"Laser hazard classification of a line laser with an astigmatic extended source","authors":"Wesley J. Marshall, Robert C. Aldrich, Annette Frederiksen","doi":"10.2351/7.0001260","DOIUrl":"https://doi.org/10.2351/7.0001260","url":null,"abstract":"Since lasers are used in a large variety of applications, new laser products have become more complex. To increase performance, like range or brightness, it is important to consider the maximum optical output that will not exceed laser safety limits. Exposure to an extended source laser results in a larger retinal image and a simplification of treating it as a point source unnecessarily restricts system performance. For laser beams where the location of the apparent source (beam waist) is different in each axis (astigmatic beams), the retinal image is asymmetric and is also a function of eye accommodation. Lasers with astigmatic beams are often evaluated as point sources because accommodation on the source in either beam axis can indicate that the source in that axis is a point source; however, the eye can only focus (accommodate) on one distance at a time. For a single accommodation of the eye, the source may be extended, and extended source lasers are considered less hazardous than point source lasers of the same output power because of the reduction of retinal irradiance (the power is distributed over a larger area). For a line laser with an astigmatic beam, a particular laser hazard class may allow for a higher laser output power than would be allowed if it were a point source laser.","PeriodicalId":50168,"journal":{"name":"Journal of Laser Applications","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141039755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

New thermal solver for mitigating surface temperature instability in laser-induced heating 用于缓解激光诱导加热中表面温度不稳定性的新型热解算器

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-05-01 DOI: 10.2351/7.0001201

Xun Zhu, Kaushik Iyer, Darren Luke

{"title":"New thermal solver for mitigating surface temperature instability in laser-induced heating","authors":"Xun Zhu, Kaushik Iyer, Darren Luke","doi":"10.2351/7.0001201","DOIUrl":"https://doi.org/10.2351/7.0001201","url":null,"abstract":"An accepted approach to computing laser-induced peak surface temperature is to employ the enthalpy formulation of the transient heat conduction equation [Grigoropoulos et al., Adv. Heat Transfer 28, 75–144 (1996); Sawyer et al., J. Laser Appl. 29, 022212 (2017)]. This approach is generally implemented using an explicit numerical scheme to solve the thermal transport equation. While it offers the advantage of modeling the solid-melt phase transition automatically, the approach results in instability-like behavior in the computed surface temperature. When laser-induced ablation becomes significant, the heating rate in the surface cell becomes unrealistically large. This results in spikes in the computed peak surface temperature due to large errors in calculating the heating rate. In this paper, we present a new approach, which we refer to as the Moving Frame Solver, that employs a moving-coordinate frame of reference, located at the receding evaporating surface. We also use an analytical representation for the phase transition region of the enthalpy-temperature relationship. The Moving Frame Solver combined with an implicit scheme leads to a stable solution without surface temperature, pressure, or velocity spikes. In other words, any instability in these computed parameters due to use of an explicit scheme (such as Dufort–Frankel) has been eliminated. Details of the new thermal solver and example calculations are presented. Numerical experiments suggest that the surface cell size needs to be small, ∼0.1 μm, to obtain a highly accurate solution with a typical metal such as aluminum. Using the Moving Frame Solver with a refined grid near the surface, but coarse elsewhere, enables accurate and stable surface temperature computation.","PeriodicalId":50168,"journal":{"name":"Journal of Laser Applications","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141024500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism of pore suppression in aluminum alloy laser-MIG hybrid welding based on alternating magnetic field 基于交变磁场的铝合金激光-MIG 混合焊接中的气孔抑制机理

IF 2.1 4区工程技术

Journal of Laser Applications Pub Date : 2024-03-28 DOI: 10.2351/7.0001282

Benqiang Zhu, Yong Zhao, Fugang Chen, Juan Fu, Feiyun Wang, Guoqiang Chen, Yonghui Qin

{"title":"Mechanism of pore suppression in aluminum alloy laser-MIG hybrid welding based on alternating magnetic field","authors":"Benqiang Zhu, Yong Zhao, Fugang Chen, Juan Fu, Feiyun Wang, Guoqiang Chen, Yonghui Qin","doi":"10.2351/7.0001282","DOIUrl":"https://doi.org/10.2351/7.0001282","url":null,"abstract":"An experiment was conducted on the laser-metal inert gas hybrid welding of 7075 aluminum alloy under alternating magnetic field assistance, in order to investigate the effect of the magnetic field on weld porosity defects in aluminum alloy. The internal porosity of the weld seam under different magnetic field conditions was compared and analyzed through radiographic inspection. The impact of the alternating magnetic field on the arc shape and keyhole dynamic behavior was observed and analyzed by high-speed photography. The results showed that without a magnetic field, the arc shape underwent continuous scaling during the transition of molten droplets, the keyhole root was unstable, and there were a large number of process-induced porosities distributed in the center of the weld. When the magnetic field strength was 10 mT, the keyhole was completely unstable, and the size of the internal porosities in the weld seam significantly increased while the number of porosities decreased. At a magnetic field strength of 20 mT, the arc exhibited a rotating oscillation behavior, the keyhole was in a stable open state, and no porosity was detected in the weld seam. Upon reaching a magnetic field strength of 30 mT, the keyhole was also in a root unstable state, but the collapse and recombination speed of the keyhole were faster than that without a magnetic field, and the size and number of internal porosities in the weld seam significantly decreased.","PeriodicalId":50168,"journal":{"name":"Journal of Laser Applications","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140371271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0