Chinese Journal of Mechanical Engineering最新文献_第6页

Detection and Characterization of Defects in Additive Manufacturing by Polarization-Based Imaging System 基于偏振成像系统的增材制造缺陷检测与表征

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-25 DOI: 10.1186/s10033-023-00943-0

Xing Peng, Lingbao Kong

{"title":"Detection and Characterization of Defects in Additive Manufacturing by Polarization-Based Imaging System","authors":"Xing Peng, Lingbao Kong","doi":"10.1186/s10033-023-00943-0","DOIUrl":"https://doi.org/10.1186/s10033-023-00943-0","url":null,"abstract":"Abstract Additive manufacturing (AM) technology such as selective laser melting (SLM) often produces a high reflection phenomenon that makes defect detection and information extraction challenging. Meanwhile, it is essential to establish a characterization method for defect analysis to provide sufficient information for process diagnosis and optimization. However, there is still a lack of universal standards for the characterization of defects in SLM parts. In this study, a polarization-based imaging system was proposed, and a set of characterization parameters for SLM defects was established. The contrast, defect contour information, and high reflection suppression effect of the SLM part defects were analyzed. Comparative analysis was conducted on defect characterization parameters, including geometric and texture parameters. The experimental results demonstrated the effects of the polarization imaging system and verified the feasibility of the defect feature extraction and characterization method. The research work provides an effective solution for defect detection and helps to establish a universal standard for defect characterization in additive manufacturing.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135816897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 and Method of Testing Fracture Toughness and Impact Absorbed Energy of Ductile Metals by Spherical Indentation Tests 球形压痕试验测试延性金属断裂韧性和冲击吸收能的机理和方法

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-20 DOI: 10.1186/s10033-023-00913-6

Jianxun Li, Tairui Zhang, Shang Wang, Jirui Cheng, Weiqiang Wang

{"title":"Mechanism and Method of Testing Fracture Toughness and Impact Absorbed Energy of Ductile Metals by Spherical Indentation Tests","authors":"Jianxun Li, Tairui Zhang, Shang Wang, Jirui Cheng, Weiqiang Wang","doi":"10.1186/s10033-023-00913-6","DOIUrl":"https://doi.org/10.1186/s10033-023-00913-6","url":null,"abstract":"Abstract To address the problem of conventional approaches for mechanical property determination requiring destructive sampling, which may be unsuitable for in-service structures, the authors proposed a method for determining the quasi-static fracture toughness and impact absorbed energy of ductile metals from spherical indentation tests (SITs). The stress status and damage mechanism of SIT, mode I fracture, Charpy impact tests, and related tests were first investigated through finite element (FE) calculations and scanning electron microscopy (SEM) observations, respectively. It was found that the damage mechanism of SITs is different from that of mode I fractures, while mode I fractures and Charpy impact tests share the same damage mechanism. Considering the difference between SIT and mode I fractures, uniaxial tension and pure shear were introduced to correlate SIT with mode I fractures. Based on this, the widely used critical indentation energy (CIE) model for fracture toughness determination using SITs was modified. The quasi-static fracture toughness determined from the modified CIE model was used to evaluate the impact absorbed energy using the dynamic fracture toughness and energy for crack initiation. The effectiveness of the newly proposed method was verified through experiments on four types of steels: Q345R, SA508-3, 18MnMoNbR, and S30408.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136263185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Grinding Characteristics of MoS2-Coated Brazed CBN Grinding Wheels in Dry Grinding of Titanium Alloy 涂层mos2钎焊CBN砂轮干式磨削钛合金的磨削特性

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-20 DOI: 10.1186/s10033-023-00936-z

Junshuai Zhao, Biao Zhao, Wenfeng Ding, Bangfu Wu, Ming Han, Jiuhua Xu, Guoliang Liu

{"title":"Grinding Characteristics of MoS2-Coated Brazed CBN Grinding Wheels in Dry Grinding of Titanium Alloy","authors":"Junshuai Zhao, Biao Zhao, Wenfeng Ding, Bangfu Wu, Ming Han, Jiuhua Xu, Guoliang Liu","doi":"10.1186/s10033-023-00936-z","DOIUrl":"https://doi.org/10.1186/s10033-023-00936-z","url":null,"abstract":"Abstract As an important green manufacturing process, dry grinding has problems such as high grinding temperature and insufficient cooling capacity. Aiming at the problems of sticking and burns in dry grinding of titanium alloys, grinding performance evaluation of molybdenum disulfide (MoS 2 ) solid lubricant coated brazed cubic boron carbide (CBN) grinding wheel (MoS 2 -coated CBN wheel) in dry grinding titanium alloys was carried out. The lubrication mechanism of MoS 2 in the grinding process is analyzed, and the MoS 2 -coated CBN wheel is prepared. The results show that the MoS 2 solid lubricant can form a lubricating film on the ground surface and reduce the friction coefficient and grinding force. Within the experimental parameters, normal grinding force decreased by 42.5%, and tangential grinding force decreased by 28.1%. MoS 2 lubricant can effectively improve the heat dissipation effect of titanium alloy grinding arc area. Compared with common CBN grinding wheel, MoS 2 -coated CBN wheel has lower grinding temperature. When the grinding depth reaches 20 μm, the grinding temperature decreased by 30.5%. The wear of CBN grains of grinding wheel were analyzed by mathematical statistical method. MoS 2 lubricating coating can essentially decrease the wear of grains, reduce the adhesion of titanium alloy chip, prolong the service life of grinding wheel, and help to enhance the surface quality of workpiece. This research provides high-quality and efficient technical support for titanium alloy grinding.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136263184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Surface Characterization and Tribology Behavior of PMMA Processed by Excimer Laser 准分子激光加工PMMA的表面表征及摩擦学行为

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-19 DOI: 10.1186/s10033-023-00938-x

Dong Qin, Juan Guo, Ming Liang, Ling Chen, Weimin He

{"title":"Surface Characterization and Tribology Behavior of PMMA Processed by Excimer Laser","authors":"Dong Qin, Juan Guo, Ming Liang, Ling Chen, Weimin He","doi":"10.1186/s10033-023-00938-x","DOIUrl":"https://doi.org/10.1186/s10033-023-00938-x","url":null,"abstract":"Abstract Polyoxymethylene methacrylate (PMMA) is widely used in ophthalmic biomaterials. Misuse of PMMA in extreme environments is likely to damage the ocular surface and intraocular structures. The surface characterization and tribological behavior of PMMA processed using an excimer laser were investigated in this study by contrasting different lubrication conditions and friction cycles. The results show that the roughness of the material surface increases with laser processing, which changes its physical structure. Under lubrication, the laser-treated PMMA exhibits better hydrophilicity, especially during the use of eye drops. No obvious relationship exists between the laser-processing time and friction behavior. However, the laser treatment may contribute to the formation of friction and wear mechanisms of PMMA materials. Laser-treated PMMA in saline solution exhibits better abrasive resistance by showing a lower wear rate than that in eye drops, although it has a higher friction coefficient. In this study, the different friction stages in laser-treated PMMA were clarified under two lubrication conditions. The wear rates of the laser-treated PMMA were found to decrease with the number of cycles, and the friction coefficient has a similar variation tendency. The wear behavior of the laser-treated PMMA is dominated by the main abrasive wear and secondary transferred film formation. This study provides a theoretical basis for the development and application of ophthalmic biomaterials in complex environments by examining the material surface interface behavior and wear mechanism after laser processing using PMMA as the research matrix.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135060698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Multiscale Evaluation of Mechanical Properties for Metal-Coated Lattice Structures 金属包覆晶格结构力学性能的多尺度评价

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-12 DOI: 10.1186/s10033-023-00912-7

Lizhe Wang, Liu He, Xiang Wang, Sina Soleimanian, Yanqing Yu, Geng Chen, Ji Li, Min Chen

{"title":"Multiscale Evaluation of Mechanical Properties for Metal-Coated Lattice Structures","authors":"Lizhe Wang, Liu He, Xiang Wang, Sina Soleimanian, Yanqing Yu, Geng Chen, Ji Li, Min Chen","doi":"10.1186/s10033-023-00912-7","DOIUrl":"https://doi.org/10.1186/s10033-023-00912-7","url":null,"abstract":"Abstract With the combination of 3D printing and electroplating technique, metal-coated resin lattice is a viable way to achieve lightweight design with desirable responses. However, due to high structural complexity, mechanical analysis of the macroscopic lattice structure demands high experimental or numerical costs. To efficiently investigate the mechanical behaviors of such structure, in this paper a multiscale numerical method is proposed to study the effective properties of the metal-coated Body-Centered-Cubic (BCC) lattices. Unlike studies of a similar kind in which the effective parameters can be predicted from a single unit cell model, it is noticed that the size effect of representative volume element (RVE) is severe and an insensitive prediction can be only obtained from models containing multiple-unit-cells. To this end, the paper determines the minimum number of unit cells in single RVE. Based on the proposed method that is validated through the experimental comparison, parametric studies are conducted to estimate the impact of strut diameter and coating film thickness on structural responses. It is shown that the increase of volume fraction may improve the elastic modulus and specific modulus remarkably. In contrast, the increase of thickness of coating film only leads to monotonously increased elastic modulus. For this reason, there should be an optimal coating film thickness for the specific modulus of the lattice structure. This work provides an effective method for evaluating structural mechanical properties via the mesoscopic model.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135831143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Configuration Synthesis and Lightweight Networking of Deployable Mechanism Based on a Novel Pyramid Module 基于新型金字塔模块的可展开机构构型综合与轻量化组网

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-12 DOI: 10.1186/s10033-023-00934-1

Jinwei Guo, Jianliang He, Guoxing Zhang, Yongsheng Zhao, Yundou Xu

{"title":"Configuration Synthesis and Lightweight Networking of Deployable Mechanism Based on a Novel Pyramid Module","authors":"Jinwei Guo, Jianliang He, Guoxing Zhang, Yongsheng Zhao, Yundou Xu","doi":"10.1186/s10033-023-00934-1","DOIUrl":"https://doi.org/10.1186/s10033-023-00934-1","url":null,"abstract":"Abstract Deployable mechanism with preferable deployable performance, strong expansibility, and lightweight has attracted much attention because of their potential in aerospace. A basic deployable pyramid unit with good deployability and expandability is proposed to construct a sizeable deployable mechanism. Firstly, the basic unit folding principle and expansion method is proposed. The configuration synthesis method of adding constraint chains of spatial closed-loop mechanism is used to synthesize the basic unit. Then, the degree of freedom of the basic unit is analyzed using the screw theory and the link dismantling method. Next, the three-dimensional models of the pyramid unit, expansion unit, and array unit are established, and the folding motion simulation analysis is carried out. Based on the number of components, weight reduction rate, and deployable rate, the performance characteristics of the three types of mechanisms are described in detail. Finally, prototypes of the pyramid unit, combination unit, and expansion unit are developed to verify further the correctness of the configuration synthesis based on the pyramid. The proposed deployable mechanism provides aference for the design and application of antennas with a large aperture, high deployable rate, and lightweight. It has a good application prospect in the aerospace field.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135878449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Investigation on the Mechanical Properties and Shape Memory Effect of Landing Buffer Structure Based on NiTi Alloy Printing 基于NiTi合金打印的着陆缓冲结构力学性能及形状记忆效应研究

2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-11 DOI: 10.1186/s10033-023-00898-2

Zhenglei Yu, Renlong Xin, Zezhou Xu, Yining Zhu, Xiaolong Zhang, Shijie Hao, Zhihui Zhang, Ping Liang

{"title":"Investigation on the Mechanical Properties and Shape Memory Effect of Landing Buffer Structure Based on NiTi Alloy Printing","authors":"Zhenglei Yu, Renlong Xin, Zezhou Xu, Yining Zhu, Xiaolong Zhang, Shijie Hao, Zhihui Zhang, Ping Liang","doi":"10.1186/s10033-023-00898-2","DOIUrl":"https://doi.org/10.1186/s10033-023-00898-2","url":null,"abstract":"Abstract With the deepening of human research on deep space exploration, our research on the soft landing methods of landers has gradually deepened. Adding a buffer and energy-absorbing structure to the leg structure of the lander has become an effective design solution. Based on the energy-absorbing structure of the leg of the interstellar lander, this paper studies the appearance characteristics of the predatory feet of the Odontodactylus scyllarus . The predatory feet of the Odontodactylus scyllarus can not only hit the prey highly when preying, but also can easily withstand the huge counter-impact force. The predatory feet structure of the Odontodactylus scyllarus , like a symmetrical cone, shows excellent rigidity and energy absorption capacity. Inspired by this discovery, we used SLM technology to design and manufacture two nickel-titanium samples, which respectively show high elasticity, shape memory, and get better energy absorption capacity. This research provides an effective way to design and manufacture high-mechanical energy-absorbing buffer structures using bionic 3D printing technology and nickel-titanium alloys.","PeriodicalId":10115,"journal":{"name":"Chinese Journal of Mechanical Engineering","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135981829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Experimental Study on Ultrasonic Cavitation Intensity Based on Fluorescence Analysis 基于荧光分析的超声空化强度实验研究

IF 4.2 2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-08 DOI: 10.1186/s10033-023-00933-2

Linzheng Ye, Shida Chuai, Xijing Zhu, Dong Wang

引用次数: 0

Cavitation Diagnostics Based on Self-Tuning VMD for Fluid Machinery with Low-SNR Conditions 基于自校正VMD的低信噪比流体机械空化诊断

IF 4.2 2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-07 DOI: 10.1186/s10033-023-00920-7

Hao Liu, Zheming Tong, Bingyang Shang, Shuiguang Tong

引用次数: 0

Fretting Wear Characteristics of Nuclear Fuel Cladding in High-Temperature Pressurized Water 核燃料包壳在高温压水中的微动磨损特性

IF 4.2 2区工程技术

Chinese Journal of Mechanical Engineering Pub Date : 2023-09-04 DOI: 10.1186/s10033-023-00931-4

Jun Wang, Haojie Li, Zhengyang Li, Yujie Lei, Quanyao Ren, Yongjun Jiao, Zhenbing Cai

引用次数: 0