Optics & Laser Technology最新文献

Hybrid ANN-physical model for predicting residual stress and microhardness of metallic materials after laser shock peening 用于预测激光冲击强化后金属材料残余应力和显微硬度的混合 ANN 物理模型

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111750

Wang Zhao, Zhicong Pang, Chenxi Wang, Weifeng He, Xiaoqing Liang, Jingdong Song, Zhenyang Cao, Shuang Hu, Mo Lang, Sihai Luo

{"title":"Hybrid ANN-physical model for predicting residual stress and microhardness of metallic materials after laser shock peening","authors":"Wang Zhao, Zhicong Pang, Chenxi Wang, Weifeng He, Xiaoqing Liang, Jingdong Song, Zhenyang Cao, Shuang Hu, Mo Lang, Sihai Luo","doi":"10.1016/j.optlastec.2024.111750","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111750","url":null,"abstract":"Residual stress and microhardness formed through laser shock peening (LSP) are crucial for enhancing the mechanical properties of metallic materials in industries like aerospace, automotive, and biomedical engineering. Therefore, precise and efficient assessment of microhardness and residual stress is vital for the successful implementation of LSP in industrial applications. In this paper, we propose a physics-informed machine learning (ML) model to address these assessment challenges and accurately predict the residual stress and microhardness of metallic materials after LSP. Firstly, different physical parameters are determined according to their corresponding mechanisms, and ABAQUS software is used to resolve the attenuation characteristics of shock waves induced by lasers. Subsequently, these identified physical parameters are utilized as input features for the artificial neural networks (ANN) model in order to forecast residual stress and microhardness. The predicted results reveal that our model exhibits a high level of precision in predicting microhardness (correlation coefficient of 0.99935) and residual stress (correlation coefficient of 0.99562) for a wide range of materials subjected to LSP. By comparing our physics-informed ML model with the traditional ANN models and empirical formula, its superior performance is effectively demonstrated in terms of accuracy and effectiveness (lower error and higher precision). Its superiority lies in the effective integration of ML methods’ representational capabilities with the combination of domain knowledge and physical understanding. This approach not only establishes a robust theoretical foundation for predicting these behaviors but also holds great promise for practical applications in industries that utilize LSP due to the universality for various materials.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"148 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Droplet transfer characteristics in high-power laser–MAG hybrid welding: Influence of energy parameters 高功率激光-MAG 混合焊接中的液滴传输特性：能量参数的影响

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111496

Yafeng Zheng, Yuanlong An, Jia Yu, Liang Wang, Qunli Zhang, Huaxia Zhang, Rangda Wu, Jianhua Yao

{"title":"Droplet transfer characteristics in high-power laser–MAG hybrid welding: Influence of energy parameters","authors":"Yafeng Zheng, Yuanlong An, Jia Yu, Liang Wang, Qunli Zhang, Huaxia Zhang, Rangda Wu, Jianhua Yao","doi":"10.1016/j.optlastec.2024.111496","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111496","url":null,"abstract":"High-power laser–arc hybrid welding experiments were performed on Q345 low-alloy steel with a thickness of 10 mm, and the effects of energy parameters such as laser power, arc power, laser–arc distance, and welding speed on the droplet transfer behavior were investigated using a high-speed imaging system. The distance between the position of the droplet falling into the molten pool and the keyhole was statistically analyzed to determine the effect of the change in the droplet transfer behavior on welding stability. Results revealed that a strong reactive force from metal vapor was generated as the laser power exceeded 6.5 kW, causing the droplet transfer trajectory to shift, which enhanced welding stability. The stability of the keyhole became worse when the laser power was increased to 9.5 kW. As the arc power increased from 4096 to 6860 W, the droplet transfer mode appeared as a mixed transfer mode dominated by globular droplet transfer, projected droplet transfer, and spray droplet transfer. A single-spray droplet transfer mode was discerned when the arc power exceeded 7394 W. In this regard, the increased arc power will enhance the stability of the welding process. Excessively large or small values will lead to poor welding stability, with the former attributed to the strong mutual interference between the laser and arc and the latter ascribed to the weakened attraction of the laser to the arc. Moreover, arc stability and droplet transfer frequency decreased with an increasing welding speed.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tunable optical response of defective rGO-like carbon films studied by spectroscopic ellipsometry 通过光谱椭偏仪研究有缺陷的 rGO 类碳薄膜的可调光学响应

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111739

Sudarsono, Faridawati, Endhah Purwandari, Deril Ristiani, Eri Widianto, Iman Santoso, Gatut Yudoyono, Darminto

引用次数: 0

Deep learning based speckle image super-resolution for digital image correlation measurement 基于深度学习的斑点图像超分辨率，用于数字图像相关性测量

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111746

Lianpo Wang, Zhaoyang Lei

{"title":"Deep learning based speckle image super-resolution for digital image correlation measurement","authors":"Lianpo Wang, Zhaoyang Lei","doi":"10.1016/j.optlastec.2024.111746","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111746","url":null,"abstract":"Digital image correlation (DIC) is a non-contact deformation measurement method based on speckle matching, widely used in experimental mechanics, explosive mechanics, construction measurement and other fields. However, when the DIC method uses a small resolution camera to measure large-sized objects, the resolution of speckle images will decrease. This not only leads to a decrease in the resolution of the measured deformation field, but also reduces the speckle size in the image, resulting in a decrease in measurement accuracy. To improve the resolution of the speckle image, we propose a deep learning-based speckle image super-resolution approach, named Speckle-SRGAN. Speckle-SRGAN is designed based on the high-frequency and fine texture characteristics of speckle images, and it introduces coordinate attention mechanism and global depth residual module to preserve high-frequency and fine textures. Low resolution speckle images are processed by Speckle-SRGAN to transform into high-resolution speckle images with high fidelity. Simulation and experimental results show that Speckle-SRGAN can increase the resolution of speckle image by 4 times and the speckle is smooth without loss of details. The real experiment also shows that using our method to preprocess speckle images can reduce the measurement error of traditional DIC methods by about 0.01 pixels. The code and data of this paper is released at: SpeckleSRGAN.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid computer-generated hologram with lightweight local and global self-attention network 具有轻量级局部和全局自注意力网络的快速计算机生成全息图

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111740

Qingxiao Liu, Changchun Zhao, Fen Zhao, De Sun, Tingyu Zhao, Junan Zhang

{"title":"Rapid computer-generated hologram with lightweight local and global self-attention network","authors":"Qingxiao Liu, Changchun Zhao, Fen Zhao, De Sun, Tingyu Zhao, Junan Zhang","doi":"10.1016/j.optlastec.2024.111740","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111740","url":null,"abstract":"Computer-generated holography is a technique that utilizes computers and algorithms to generate holographic images. Deep learning-based Computer-generated holography can learn the mapping relationship between input images and holographic images, which offers faster computation speed and better image quality comparing with direct encoding and iterative optimization methods. However, most methods typically employ stacked convolutional layers to expand the receptive field, which leads to a sharp increase in computational cost as well as number of parameters. We proposed a rapid computer-generated holograms method with lightweight local and global self-attention networks (LGSANet), which performs phase encoding of input images as an alternative to the conventional holographic method for recording object information. Once the network training is completed, it is possible to perform high quality holograms with a spatial resolution of 1920 × 1080 within 39 ms. By importing the encoded phase of input images into a spatial light modulator (SLM), a clear reconstructed image can be obtained at the observation plane by irradiating the SLM with a reference light (@λ = 532 nm). Experimental results show the proposed method exhibits significant improvements in peak signal-to-noise ratio (PSNR) and structural similarity index (SSIM), as well as reduced speckle noise, which can be applied to holographic displays, AR/VR, metasurface design, medical imaging, etc.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of laser mode on size effect in manufacturing AlSi10Mg mini-structures by laser powder bed fusion technology 利用激光粉末床熔融技术制造 AlSi10Mg 微型结构时激光模式对尺寸效应的影响

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111748

Zhaomeng Rui, Jia Liu, Yan Shi

{"title":"Influence of laser mode on size effect in manufacturing AlSi10Mg mini-structures by laser powder bed fusion technology","authors":"Zhaomeng Rui, Jia Liu, Yan Shi","doi":"10.1016/j.optlastec.2024.111748","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111748","url":null,"abstract":"The mechanical properties of lightweight mini-truss structures manufactured by laser powder bed fusion (L-PBF) technology deviate widely from design targets. To investigate the causes and solutions of the above problems, the pillar diameter threshold that does not generate thermal accumulation under different laser modes was calculated by numerical simulation in this paper, which reveals the generation mechanism of thermal accumulation in the melting process of columnar samples. The effects of pillar diameter and laser mode on the microstructure and mechanical properties of AlSi10Mg prepared by L-PBF were also investigated experimentally. The experimental and simulation results show that in the continuous wave (CW) laser mode, as the diameter decreases, the solidification rate of the molten pool decreases, the size of the heat affected zone (HAZ) increases, and the ultimate tensile strength (UTS) and elongation after fracture (EL) decrease significantly. The microstructure of the submillimeter struts can be well modulated using a pulsed wave (PW) laser, and the sample strength can be increased by 12 %. The EL of the tensile samples in this study depended on the diameter of the sample, and there was no significant correlation with the laser mode. The experimental results regulate the size effect in additive manufacturing and improve the mechanical properties of metal mini-truss structures.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modeling of process parameters and wear performance investigation of Inconel 625 nickel-based coatings via laser cladding 通过激光熔覆 Inconel 625 镍基涂层的工艺参数建模和磨损性能研究

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111749

Yufeng Wu, Xuming Wu, Lincong Li, Bin Li, Zhaohui Wang

{"title":"Modeling of process parameters and wear performance investigation of Inconel 625 nickel-based coatings via laser cladding","authors":"Yufeng Wu, Xuming Wu, Lincong Li, Bin Li, Zhaohui Wang","doi":"10.1016/j.optlastec.2024.111749","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111749","url":null,"abstract":"In this study, laser cladding technology was employed to fabricate Inconel 625 coatings on the surface of 15CrMo alloy steel. The formation appearance, melt width, dilution rate, composition, microstructure, microhardness, and wear behavior of the coatings were investigated using X-ray diffraction (XRD), optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness testing, wear testing machines, and laser confocal microscopy. Experimental results indicate that an optimal linear energy range of 10.8–14.4 W·min/mm and a powder feeding density range of 0.125–0.16 g/mm yield high-quality coatings with well-formed structures, refined grains, and enhanced microhardness. For the first time, the concept of powder feeding density was introduced. Based on the functional relationships between linear energy, powder feeding density, and coating characteristics, bead width and dilution rate models for Inconel 625 coatings were established, providing a theoretical basis for engineers to optimize the laser cladding process. Furthermore, friction and wear test results demonstrated that the coatings possess excellent wear resistance under optimal parameters, with the primary wear mechanisms being adhesive wear and oxidative wear.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser transmission welding of Poly(vinyl chloride) and polyamide 66 based on green femtosecond laser surface modification 基于绿色飞秒激光表面改性的聚氯乙烯和聚酰胺 66 激光透射焊接

Optics & Laser Technology Pub Date : 2024-09-07 DOI: 10.1016/j.optlastec.2024.111737

Dongyang Wang, Minqiu Liu, Sizhi Xu, Jianxun Lu, Ying Zhang, Jianpang Zhai, Shuangchen Ruan, Deqin Ouyang, Chunbo Li

{"title":"Laser transmission welding of Poly(vinyl chloride) and polyamide 66 based on green femtosecond laser surface modification","authors":"Dongyang Wang, Minqiu Liu, Sizhi Xu, Jianxun Lu, Ying Zhang, Jianpang Zhai, Shuangchen Ruan, Deqin Ouyang, Chunbo Li","doi":"10.1016/j.optlastec.2024.111737","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111737","url":null,"abstract":"To improve the bonding strength of unweldable poly(vinyl chloride) (PVC) and polyamide 66 (PA66), a surface treatment method using green femtosecond laser (GFL) to modify PVC before welding was proposed in this study. The experiments of GFL surface modification, 1940 nm laser transmission welding (LTW), mechanical properties test and related characterization were carried out. The effects of GFL parameters on the physical and chemical properties of the modified surface and the bonding strength of the dissimilar joints were investigated in detail. The bonding mechanism of PVC/PA66 joints was analyzed comprehensively. The results showed that laser modification induced the deposition of many oxygen-containing functional groups on the PVC surface. These oxygen-containing functional groups form a highly polar modified layer on the surface, thereby improving the miscibility and welding performance of PVC/PA66. Finally, the modification and welding parameters were optimized based on the response surface methodology (RSM), and the maximum shear strength was 8.9 MPa.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface roughness evolution of 1Cr12Ni3MoVN alloy prepared by additive/subtractive hybrid manufacturing 添加剂/减量剂混合制造法制备的 1Cr12Ni3MoVN 合金的表面粗糙度演变

Optics & Laser Technology Pub Date : 2024-09-06 DOI: 10.1016/j.optlastec.2024.111743

Zhen Wang, Chunhuan Guo, Songchuan Shi, Zubin Chen, Guorui Jiang, Chuanming Liu, De Xu, Fengchun Jiang

{"title":"Surface roughness evolution of 1Cr12Ni3MoVN alloy prepared by additive/subtractive hybrid manufacturing","authors":"Zhen Wang, Chunhuan Guo, Songchuan Shi, Zubin Chen, Guorui Jiang, Chuanming Liu, De Xu, Fengchun Jiang","doi":"10.1016/j.optlastec.2024.111743","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111743","url":null,"abstract":"To improve the surface quality of samples manufactured by directed energy deposition (DED), the subtractive process is integrated with additive manufacturing, a method known as additive/subtractive hybrid manufacturing (ASHM). The correlation between the surface quality of the subtractive process and the process parameters of additive manufacturing has been established in this work. The results demonstrate that a high linear energy density can improve the surface quality of the subtractive process. To comprehensively analyze the mechanisms, field emission scanning electron microscopy and nanoindentation are employed to investigate the microstructure and mechanical behavior of the ASHMed specimens. It is observed that increasing linear energy density can strengthen the tempering effect on the previously deposited layer, thereby promoting the precipitation of MC (M=Mo) carbides along the grain boundary and reducing defects at the grain boundary. Furthermore, this enhancement reinforces the grain boundary strength, leading to a transition in the fracture mechanism from intergranular to transgranular fracture during the subtractive process. As a result, the surface roughness of ASHMed samples improves with increasing linear energy density. Additionally, the finite element simulation of the ASHM process was performed, demonstrating a close correspondence with experimental results, with an error margin of 6.30 %. In conclusion, the model described in this paper can predict the surface quality of the 1Cr12Ni3MoVN alloy fabricated by the ASHM.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"182 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Contrast enhancement algorithm for infrared images based on multiscale difference of morphological reconstruction 基于形态重建多尺度差异的红外图像对比度增强算法

Optics & Laser Technology Pub Date : 2024-09-06 DOI: 10.1016/j.optlastec.2024.111728

Yongsong Li, Zhengzhou Li, Abubakar Siddique, Yuchuan Liu

{"title":"Contrast enhancement algorithm for infrared images based on multiscale difference of morphological reconstruction","authors":"Yongsong Li, Zhengzhou Li, Abubakar Siddique, Yuchuan Liu","doi":"10.1016/j.optlastec.2024.111728","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.111728","url":null,"abstract":"The visual interpretation of infrared images is often hindered by low contrast and a limited dynamic range. This poses a significant challenge as existing enhancement methods are often limited in their ability to simultaneously improve contrast, suppress noise, and effectively handle overexposed and underexposed regions. To overcome these limitations, this article presents a novel contrast enhancement algorithm for infrared images based on the multiscale difference of morphological reconstruction. The proposed algorithm operates in three steps. First, a sequential gray morphological reconstruction (SGMR) technique is introduced to effectively remove noise by eliminating bright and dark connected regions in the image. Second, the difference of sequential gray morphological reconstruction (DoSGMR) is designed to extract salient information at various scales, enabling the enhancement of details without amplifying noise. Third, an adaptive fusion strategy is designed to integrate the extracted salient information, enhancing the contrast while simultaneously addressing overexposure and underexposure problems. Experimental results demonstrate that the proposed algorithm outperforms existing methods, achieving superior contrast enhancement, particularly for challenging infrared images corrupted by noise, overexposure, or underexposure.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142219886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0