Experimental Techniques最新文献

{"title":"Influence of Small Degree Deviation from [001] Orientation on Material Parameters and Fatigue Damage Evolution Law of Ni-Based Single Crystal Superalloys","authors":"Y. Zhao,&nbsp;W. Feng,&nbsp;Y. Yang,&nbsp;Y. Zhou,&nbsp;Y. Zhu,&nbsp;Z. Liu,&nbsp;H. Xie","doi":"10.1007/s40799-025-00842-0","DOIUrl":"10.1007/s40799-025-00842-0","url":null,"abstract":"<div><p>The characterization of material parameters and the study of fatigue properties of nickel-based single crystal materials at high temperatures are critical to the reliability and safety of turbine engine blades. In this paper, a long-term high temperature resistant micro-speckle fabrication method is developed, and a constructed Digital Image Correlation (DIC) real-time observation system is utilized to monitor the damage evolution behavior of nickel-based single crystals under high-temperature fatigue. The “equivalent modulus”, “equivalent Poisson’s ratio” and “equivalent thermal expansion” of nickel-based single crystal alloys with different deviation angles (5°, 10°, 15° and 20° from [001] orientation, respectively) were obtained by uniaxial tensile experiments at 980℃ combined with integrated digital image correlation (I-DIC) inversion method. The changing law of each thermodynamic parameter with the increase of temperature was analyzed. That is, both the equivalent Poisson's ratio and equivalent thermal expansion coefficient of nickel-based single crystal superalloys increase with temperature, and the “equivalent thermal expansion coefficient” of the material in two directions is different, [001] direction is always greater than that in the [110] direction; the “equivalent modulus” decreases with increasing temperature and increases with increasing deviation angle. And for the first time, a prediction method using the local “equivalent modulus” as the damage variable is proposed. The variation law of local “equivalent modulus” with fatigue cycles under different deviation angles is analyzed. The local “equivalent modulus” decreases with the increase of fatigue cycles under different deviation angles. When the deviation is 10°, the local “equivalent modulus” decreases the fastest. When deviating from 5°, the local “equivalent modulus” decreases relatively slowly. Finally, the fatigue damage evolution equation with the local “equivalent modulus” of different deviation angles as the damage variable is established. By comparing the fitting curve of the formula with the actual value of the experiment, it is found that the fitting degree is good, which verifies the accuracy and validity of the method of predicting fatigue life with the local “equivalent modulus” as the damage variable.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 5","pages":"745 - 761"},"PeriodicalIF":1.8,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149099094","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}

{"title":"Investigation of Distributed Optic Fiber Sensors Data Loss Due to Strain Gradient","authors":"S. Farahbakhsh,&nbsp;M. Poncelet,&nbsp;L. Chamoin","doi":"10.1007/s40799-025-00847-9","DOIUrl":"10.1007/s40799-025-00847-9","url":null,"abstract":"<div><p>While measuring strain with OFDR sensors, local data loss might be observed despite adherence to the prescribed strain range. A possible cause of this loss is the magnitude of the local strain gradient. To verify this hypothesis, a custom sample is here designed to impose controlled strain gradients along the fiber path. The results confirm that the occurrence of data loss is influenced by the strain gradient. Additionally, it is found that the gage pitch of the optic fiber sensor plays a crucial role in the amount of data loss, with larger gage pitches showing a higher propensity for data loss, with a significantly lower threshold. These findings are consistent with observations from previous tests, including a four-point bending test. These results provide valuable insights into the limitations of OFDR fiber sensors under high strain gradient conditions and suggest that sensor design, including gage pitch, should be carefully considered in applications requiring precise strain measurements.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 5","pages":"709 - 726"},"PeriodicalIF":1.8,"publicationDate":"2025-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098773","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}

{"title":"Simulation and Experiment Analysis of Residual Stress Distribution Law in FSW Joint of 2219-T8 Aluminum Alloy Thick Plate","authors":"L. Teng,&nbsp;X. Lu,&nbsp;H. Zhang,&nbsp;G. Zhang","doi":"10.1007/s40799-025-00855-9","DOIUrl":"10.1007/s40799-025-00855-9","url":null,"abstract":"<div><p>In the process of 2219 aluminum alloy thick plate FSW, the residual stress of the joint is large, which will reduce the performance of weldment. The residual stress distribution law of 2219 aluminum alloy thick plate FSW joint is explored based on simulation in this paper. The tool model with total elements of geometrical characteristics is established, the material parameter and friction coefficient varying with temperature are considered. The local fine mesh generation and quality scaling technology are used to improve the computational efficiency. Finally, the simulation of residual stress in FSW joint of 2219 aluminum alloy thick plate is realized based on ABAQUS/CEL. The size of the test sample is determined according to Saint Venant principle, and the validity of the model is verified by the X-ray diffraction method. The residual stress distribution law of the joint is analyzed. The results show that the established model can accurately simulate the residual stress distribution after welding, and the transverse residual stress is always lower than the longitudinal residual stress. The longitudinal residual stresses on both sides of the joint are asymmetrically distributed, and the residual stresses on the advancing side are higher than those on the retreating side. This research result provide key theoretical basis for optimizing the welding parameters of thick plate FSW.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 5","pages":"727 - 743"},"PeriodicalIF":1.8,"publicationDate":"2025-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098774","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}

{"title":"Note from the Editor 2025","authors":"B. R. Antoun","doi":"10.1007/s40799-025-00848-8","DOIUrl":"10.1007/s40799-025-00848-8","url":null,"abstract":"","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"49 6","pages":"985 - 985"},"PeriodicalIF":1.9,"publicationDate":"2025-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145706173","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}

{"title":"On the Cover: Evaluation of Identification Methods for Joints with Inaccessible Interfaces Using Frequency-Based Substructuring","authors":"","doi":"10.1007/s40799-025-00853-x","DOIUrl":"10.1007/s40799-025-00853-x","url":null,"abstract":"","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"49 6","pages":"983 - 983"},"PeriodicalIF":1.9,"publicationDate":"2025-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145706076","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}

{"title":"USRobot: Unit Selection-Based Rigid-Flexible Coupling Hand Rehabilitation Robot","authors":"Y.-Y. Guo,&nbsp;S. Li,&nbsp;Y.-Q. Zhang,&nbsp;M.-N. Zhai,&nbsp;C. He,&nbsp;X.-Q. Bai,&nbsp;Z.-G. Zhang,&nbsp;Z.-J. Zhang","doi":"10.1007/s40799-025-00854-w","DOIUrl":"10.1007/s40799-025-00854-w","url":null,"abstract":"<div><p>Given the increasing prevalence of post-stroke hand dysfunction and the limitations of existing rehabilitation robots–rigid structures offering high precision but poor compliance, and flexible systems providing comfort but low control accuracy, this study proposes a novel rigid-flexible coupled hand rehabilitation robot based on a “unit selection” design strategy. By analyzing the kinematic characteristics of the human hand, a finger equivalent model was established using the D-H parameter method. The design integrates rigid constraint tracks with a tendon-driven system and micro-motors to achieve synergistic optimization of precision and compliance. Dynamic simulations using ADAMS software validated the smooth motion and safe joint angle variations of the mechanism. Prototype experiments with 3D-printed components and an image-capture system confirmed the feasibility of the design and the accuracy of rehabilitation trajectories. Results demonstrate that the proposed robot effectively combines the control advantages of rigid structures with the compliance of flexible systems, offering a new solution for enhancing hand rehabilitation outcomes.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 4","pages":"639 - 651"},"PeriodicalIF":1.8,"publicationDate":"2025-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357753","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}

{"title":"Design and Development of an Open-Source Wireless System for Structural Deformation Measurement with Smartphone Communication","authors":"E. Preto,&nbsp;M. M. Donatoni,&nbsp;A. W. Nunes,&nbsp;D. C. J. Karmouche","doi":"10.1007/s40799-025-00850-0","DOIUrl":"10.1007/s40799-025-00850-0","url":null,"abstract":"<div><p>Measuring deformation using strain gauges is well-established in literature and industry. Commercially, several systems can acquire strain gauge measurements, yet those that offer wireless data transmission or communication with portable devices such as smartphones are very limited. This work introduces a new portable acquisition device with smartphone communication to acquire deformation data from instrumented structures with strain gauges. The developed device uses accessible, low-cost components such as the microprocessor provided by Espressif Systems, the operational amplifier, and a secure digital card reader. The microprocessor handles the processing and transmission of deformation data to the smartphone via Bluetooth Low Energy, while the data is processed and analyzed through an Android application developed in Kotlin. The system’s measurement and data transfer capabilities were validated through tests on bending and pure torsion setups. In addition, experiments were conducted to verify the similarity between the data collected by the smartphone and the card, and the system’s operating range was also evaluated. This work presents an open-source device that enables smartphone-based acquisition, facilitating and reducing the cost of strain gauge signal acquisition, while also allowing installation on structures in hard-to-reach areas for remote monitoring.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 4","pages":"687 - 698"},"PeriodicalIF":1.8,"publicationDate":"2025-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357881","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}

{"title":"Materials Young's Modulus Identification Using Genetic Algorithms","authors":"C. D. Santos Sales,&nbsp;F. J. Grandinetti,&nbsp;T. S. Castro,&nbsp;Á. M. de Souza Soares","doi":"10.1007/s40799-025-00851-z","DOIUrl":"10.1007/s40799-025-00851-z","url":null,"abstract":"<div><p>This paper presents a novel method for determining the modulus of elasticity of materials using a non-destructive testing method based on the Genetic Algorithm method. Conventional methods for determining material properties, such as tensile tests, often require specialized, expensive equipment and are inherently destructive. In contrast, the proposed method uses optimization techniques to minimize the error between the experimental curvature of a beam and its analytical model. The method is validated against preliminary results that show a high degree of accuracy in estimating the elastic modulus, with values closely matching real material properties. This approach provides a cost-effective and efficient alternative for characterizing material properties without the need for destructive testing or specialized equipment.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 4","pages":"699 - 705"},"PeriodicalIF":1.8,"publicationDate":"2025-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357883","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}

{"title":"A Review of Efforts To Improve Dynamic Environment Testing Practices","authors":"C. Taylor,&nbsp;J. DeClerck,&nbsp;J. Blough,&nbsp;C. Van Karsen,&nbsp;D. Labyak,&nbsp;R. Joshua","doi":"10.1007/s40799-025-00844-y","DOIUrl":"10.1007/s40799-025-00844-y","url":null,"abstract":"<div><p> When performing in-lab vibration or shock testing, the test article is attached to the desired excitation equipment through a test fixture. Historically, these fixtures are designed to be rigid, with the fixture natural frequencies much higher than the band of interest, therefore not inducing any additional dynamics on the test article. However, this approach results in an unrealistic representation of the dynamic field environments experienced by test articles which can lead to over-testing or under-testing.</p><p> Several methods aimed to improve dynamic environment testing have been developed and studied over the years. This paper contains a review of the history of vibration testing and methods explored to improve common test practices with a focus on dynamic fixture design and optimization. </p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 1","pages":"7 - 21"},"PeriodicalIF":1.9,"publicationDate":"2025-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337703","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}

{"title":"Efficient Stratospheric Airship Skin Deformation Measurement via Normal Distribution Approximated Digital Image Correlation","authors":"Y. Cheng,&nbsp;Q. Wang,&nbsp;Y. Chen","doi":"10.1007/s40799-025-00849-7","DOIUrl":"10.1007/s40799-025-00849-7","url":null,"abstract":"<div><p>The measurement of envelope deformation is a crucial component of structural health monitoring for stratospheric airships. This paper offers an improved approach for monitoring the deformation of airship envelopes based on digital image correlation, highlighting the advantages of non-contact operation and full-field visualization. Due to the complex operational scenarios of stratospheric airships and the high computational cost of traditional image interpolation-based iterative methods, it is challenging to achieve skin sub-pixel displacement measurement efficiently. To this end, building on algorithmic innovation and experimental design, we propose a novel sub-pixel displacement searching strategy that combines the Gaussian peak approximation with finite-difference calculation and further validate the strategy through a dedicated experimental protocol implemented on a ground-based airship. Experimental results demonstrate that the proposed method enhances measurement accuracy while maintaining computational efficiency and captures the complex non-uniform deformation patterns of the airship envelope during pressurized inflation. In short, our method provides reliable data for stratospheric airship skin deformation analysis and offers a solid technical solution for airship structural health monitoring.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"50 4","pages":"667 - 686"},"PeriodicalIF":1.8,"publicationDate":"2025-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357888","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}