Experimental Techniques最新文献_第10页

Experimental Study of Helical Milling Carbon Fiber Reinforced Plastics by Variable Parameters 利用可变参数螺旋铣削碳纤维增强塑料的实验研究

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-07-08 DOI: 10.1007/s40799-023-00665-x

A. Jiao, Y. Zhang, J. Zhang, J. Li

{"title":"Experimental Study of Helical Milling Carbon Fiber Reinforced Plastics by Variable Parameters","authors":"A. Jiao, Y. Zhang, J. Zhang, J. Li","doi":"10.1007/s40799-023-00665-x","DOIUrl":"10.1007/s40799-023-00665-x","url":null,"abstract":"<div><p>In order to significantly reduce the defects of hole-making on Carbon Fiber Reinforced Plastics (CFRP), a scheme on the variable parameter helical milling experiments was carried out. First, the helical milling process was analyzed. Second, using the response surface methodology (RSM) in the experiments, the max exit tear value, aperture diameter and surface roughness <i>Ra</i> at the intermediate area were analyzed and the optimum combination of parameters was obtained: spindle speed 8962 r/min, helical speed 60 r/min, and pitch 0.207 mm at the hole entry and exit areas; spindle speed 6242 r/min, helical speed 87 r/min, and pitch 0.205 mm at the hole intermediate area. Last, the effect of milling direction on hole-making was obtained: up milling at the hole entry and exit areas and down milling at the hole intermediate area. The superiority of variable parameter helical milling experiment was verified: there were fewer defects such as burrs and tears at hole entry and exit areas; and the surface roughness <i>Ra</i> was 6.39% lower, the aperture deviation was from + 0.011 mm to -0.007 mm at the hole intermediate area. Therefore, the quality of hole-making by the variable parameter helical milling scheme was significantly improved.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"343 - 357"},"PeriodicalIF":1.5,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91360775","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

On the Cover: Modeling and Experimental Verification of Torsional Deformation Constitutive Model of Tread Rubber Based on Digital Image Correlation 封面上:基于数字图像相关的胎面橡胶扭转变形本构模型建模与实验验证

IF 1.6 4区工程技术

Experimental Techniques Pub Date : 2023-07-08 DOI: 10.1007/s40799-023-00666-w

引用次数: 0

In-Situ Magnetic Barkhausen Noise Measurements to Identify Elastic-Plastic Deformation and Failure in Different Steels 通过原位磁性巴克豪森噪声测量确定不同钢材的弹塑性变形和破坏情况

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-06-29 DOI: 10.1007/s40799-023-00663-z

J. Chai, Z. Shen, J. Zhong, B. Xu, Z. Zhang, X. Zhang, J. Shen

{"title":"In-Situ Magnetic Barkhausen Noise Measurements to Identify Elastic-Plastic Deformation and Failure in Different Steels","authors":"J. Chai, Z. Shen, J. Zhong, B. Xu, Z. Zhang, X. Zhang, J. Shen","doi":"10.1007/s40799-023-00663-z","DOIUrl":"10.1007/s40799-023-00663-z","url":null,"abstract":"<div><p>Plastic processing operations of ferromagnetic materials may cause significant mechanical stress, which has a strong impact on its final magnetic behavior. In this paper, the magneto-mechanical correlations between the stress-strain behavior and magnetic Barkhausen noise emission in three typical steels subjected to uniaxial tension were studied comparatively, the tensile damage and fracture morphology of each sample was identified by magnetic measurements and scanning electron microscopy. The results show that the characteristics values of Barkhausen noise envelope can be approximated by a parabolic function of the carbon content experimentally and theoretically. In the elastic region, the Barkhausen noise response exhibits progressive growth with increasing strain, and reaches saturation at a critical point for the stress-induced magnetic anisotropy. However, once plastic deformation occurs, the Barkhausen noise signal intensity appears a downward trend until specimen failure, because the increasing dislocation tangles further hinder the domain wall motion. According to the mapping of Barkhausen noise eigenvalues, the location of tensile cracking is determined with a very satisfactory agreement. This indicates that the magnetic Barkhausen noise technique can be used for the nondestructive quantitative evaluation of elastoplastic deformation and failure location of ferromagnetic products.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"381 - 392"},"PeriodicalIF":1.5,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90042436","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

Double Stage Friction Stir Spot Extrusion Welding: a Novel Manufacturing Technique for Joining Sheets 双层摩擦搅拌点挤压焊接：一种用于连接板材的新型制造技术

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-06-26 DOI: 10.1007/s40799-023-00660-2

I.T. Abdullah, M.K. Mejbel, B.M.A. Al-bhadle

{"title":"Double Stage Friction Stir Spot Extrusion Welding: a Novel Manufacturing Technique for Joining Sheets","authors":"I.T. Abdullah, M.K. Mejbel, B.M.A. Al-bhadle","doi":"10.1007/s40799-023-00660-2","DOIUrl":"10.1007/s40799-023-00660-2","url":null,"abstract":"<p>A Novel Technique is proposed in this investigation called Double Stage Friction Stir Spot Extrusion Welding (DSFSSEW). It is carried out in two stages by using a pin-shoulder tool in step 1 and a pin-less tool in step 2 to investigate the joint strength of the AA1050 sheet. The advantage of this new double-stage FSSEW technique compared to the classical FSSW led to the elimination of the keyhole, which is an intrinsic flaw of the Friction Stir Spot Welding (FSSW) process resulting in higher mechanical joint properties. The impact of the plunge depth and tool revolving speed on the characteristics of the bond was investigated. The height of the extruded aluminium was increased by increasing the tool rotation speed and the plunging depth which was the effective variable. The joint strength was increased in step 2. The two sheets are bonding together at a line of the interface by a mechanical interlock formed by a continuous metal flow of aluminium extrusion that is free of flaws. There were two mechanisms of failure in the studied samples: cleavage of the aluminium metal at the tool trace and shearing of the extruded aluminium, respectively. The suggested method is novel and has a great potential for future investigation, this work might pave the way for studies of welding with additional alloys, both similar and dissimilar to those already studied.</p>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"323 - 342"},"PeriodicalIF":1.5,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77791334","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

An Experimental Study of a Steady Plane Wall Jet with Different Reynolds Numbers, Coflow Stream and Surface Conditions 不同雷诺数、同流和表面条件下的稳定平面壁面喷流实验研究

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-06-22 DOI: 10.1007/s40799-023-00659-9

YL. Zhong, ZT. Yan, E. Savory, XP. Liu, J. Luo, XG. Yang, JY. Cao

{"title":"An Experimental Study of a Steady Plane Wall Jet with Different Reynolds Numbers, Coflow Stream and Surface Conditions","authors":"YL. Zhong, ZT. Yan, E. Savory, XP. Liu, J. Luo, XG. Yang, JY. Cao","doi":"10.1007/s40799-023-00659-9","DOIUrl":"10.1007/s40799-023-00659-9","url":null,"abstract":"<p>The effects of Reynolds number, coflow stream and surface roughness on a steady two-dimensional wall jet were examined experimentally in an atmospheric boundary layer wind tunnel using a Cobra probe. Five Reynolds numbers in the range 56,500 < <i>Re</i> < 134,000 and five values of coflow velocity/jet velocity ratio ranging from 0.11 to 0.23 were considered. In addition, a 40-grit sheet was used as the rough surface to investigate the effect of surface roughness. The results demonstrate that the Reynolds stress increases with the decrease of slot Reynolds number, and the effects of a higher Reynolds number on the spread of the half-height and the decay of maximum velocity are less pronounced. The coflow and surface roughness have a clear effects on the streamwise development of the half-height and the maximum mean velocity. The coflow significantly decreases the spread rate and the decay of maximum velocity compared with those without coflow, while the surface roughness increases those parameters relative to those on a smooth surface.</p>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"285 - 298"},"PeriodicalIF":1.5,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77116965","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

Low-Velocity Impact Damage Quantification on Sandwich Panels by Thermographic and Ultrasonic Procedures 通过热成像和超声波程序量化三明治夹芯板上的低速冲击损伤

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-06-22 DOI: 10.1007/s40799-023-00661-1

A. Pirinu, A. Saponaro, R. Nobile, F. W. Panella

{"title":"Low-Velocity Impact Damage Quantification on Sandwich Panels by Thermographic and Ultrasonic Procedures","authors":"A. Pirinu, A. Saponaro, R. Nobile, F. W. Panella","doi":"10.1007/s40799-023-00661-1","DOIUrl":"10.1007/s40799-023-00661-1","url":null,"abstract":"<p>Composite sandwich structures are widely used for their mechanical properties combined to lightweight. However, damage area quantification caused by low velocity impacts represents generally a crucial task in sandwich composites. In the last years, recent advantages of thermographic devices offer new promising and different real-time industrial and engineering applications where lower computation time, accuracy of results and convenient cost are required. The present research deals with the comparison of standard or latest image-processing methods proposed for pulsed thermography regarding their suitability for determining the impact damage area in sandwich materials made of Aluminium core an a GFRP laminated skins. The Infra-Red processed results are compared with the advanced ultrasonic Phased array method commonly employed in the industrial Non-Destructive Testing. Specifically, the damage area quantification is performed by means of an appropriate MATLAB binarization algorithm for the post-processing of acquired thermal and ultrasonic maps. The data results verify the effectiveness of the image-processing thermographic technique combined to advanced processing approaches for the quantitative assessment of impact damage in sandwich component.</p>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"299 - 322"},"PeriodicalIF":1.5,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40799-023-00661-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81599373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extracting Time-Varying Dynamic Characteristics of a Typical TPS Plate via Thermal-Vibration Experiment 通过热振动实验提取典型 TPS 板的时变动态特性

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-06-21 DOI: 10.1007/s40799-023-00654-0

C. Xue, Y. Li, H. Ma, Q. Fei

{"title":"Extracting Time-Varying Dynamic Characteristics of a Typical TPS Plate via Thermal-Vibration Experiment","authors":"C. Xue, Y. Li, H. Ma, Q. Fei","doi":"10.1007/s40799-023-00654-0","DOIUrl":"10.1007/s40799-023-00654-0","url":null,"abstract":"<div><p>Extracting time-varying dynamic characteristics of an aerospace structure under thermal-vibration environment is difficult and complicated since the material properties of the structure fluctuate although the external load is constant. Initially, a composite plate model applied for time-varying system is updated based on finite strip method. Afterward, a thermal-vibration experimental system for realizing high-precision data measurement is designed, and the preliminary experiment certified the validity of experimental method. Finally, the time-varying dynamic characteristics of a typical thermal protective system plate is researched. Results show that the natural frequencies take a downward tendency with respect to heating time, and will undergo a dramatic decrease when the structure reaches the critical bulking temperature, while the damping characteristic shows an adverse trend. In addition, for certifying the applicability and accuracy of the updated model, comparisons between present model and recursive subspace method are conducted. The purpose of this paper is to provide some references on evaluating stability for aerospace structures under severe flight environment.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"273 - 284"},"PeriodicalIF":1.5,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136355294","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

Impact-Pose Estimation Using ArUco Markers in Structural Dynamics 利用结构动力学中的 ArUco 标记估算冲击姿态

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-06-21 DOI: 10.1007/s40799-023-00646-0

G. Čepon, D. Ocepek, M. Kodrič, M. Demšar, T. Bregar, M. Boltežar

{"title":"Impact-Pose Estimation Using ArUco Markers in Structural Dynamics","authors":"G. Čepon, D. Ocepek, M. Kodrič, M. Demšar, T. Bregar, M. Boltežar","doi":"10.1007/s40799-023-00646-0","DOIUrl":"10.1007/s40799-023-00646-0","url":null,"abstract":"<div><p>In structural dynamics a structure’s dynamic properties are often determined from its frequency-response functions (FRFs). Commonly, FRFs are determined by measuring a structure’s response while it is subjected to controlled excitation. Impact excitation performed by hand is a popular way to perform this step, as it enables rapid FRF acquisition for each individual excitation location. On the other hand, the precise location of impacts performed by hand is difficult to estimate and relies mainly on the experimentalist’s skills. Furthermore, deviations in the impact’s location and direction affect the FRFs across the entire frequency range. This paper proposes the use of ArUco markers for an impact-pose estimation for the use in FRF acquisition campaign. The approach relies on two dodecahedrons with markers on each face, one mounted on the impact hammer and another at a known location on the structure. An experimental setup with an analog trigger is suggested, recording an image at the exact time of the impact. A camera with a fixed aperture is used to capture the images, from which the impact pose is estimated in the structure’s coordinate system. Finally, a procedure to compensate for the location error is presented. This relies on the linear dependency of the FRFs in relation to the impact offset.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"369 - 380"},"PeriodicalIF":1.5,"publicationDate":"2023-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40799-023-00646-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91093615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-Order Time-Domain DIC Algorithm Based on a Nonlinear Optical Flow Equation 基于非线性光流方程的高阶时域 DIC 算法

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-06-07 DOI: 10.1007/s40799-023-00658-w

S. Dai, Y. Xiao, Y. Wu, X. Wen

引用次数: 0

The Effects of Aging Process After Solution Heat Treatment on Drilling Machinability of Corrax Steel 固溶热处理后的时效过程对 Corrax 钢钻孔加工性的影响

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-06-01 DOI: 10.1007/s40799-023-00656-y

A.S. Güldibi, U. Köklü, O. Koçar, E. Kocaman, S. Morkavuk

{"title":"The Effects of Aging Process After Solution Heat Treatment on Drilling Machinability of Corrax Steel","authors":"A.S. Güldibi, U. Köklü, O. Koçar, E. Kocaman, S. Morkavuk","doi":"10.1007/s40799-023-00656-y","DOIUrl":"10.1007/s40799-023-00656-y","url":null,"abstract":"<div><p>As a maraging steel, Corrax, is used in many engineering applications in the manufacturing, aerospace, and medical industries thanks to its properties such as high strength, hardness and corrosion resistance. However, these high specifications can cause some issues for manufacturing operations such as forging, machining, grinding. In addition to that, using heat treatment applications changes materials' mechanical specifications, affecting the material's behavior during machining. Therefore, it is important to characterize the influences of different heat treatment conditions on the material's property and behavior. In this study, the effects of heat treatment process on the mechanical properties, drilling machinability and corrosion resistance of Corrax steel were experimentally investigated with the samples of solution heat treated and aged at 400 °C, 525 °C, 600 °C, and 700 °C. The machinability was evaluated based on thrust force, chip morphology, hole quality, and tool wear. The results showed that the thrust force, torque and hole quality depend on feed rate, cutting speed, and mechanical properties affected by aging treatment. The highest hardness (47.4 HRC), ultimate tensile strength (1720 MPa), maximum elongation (33%), and toughness (198 jm<sup>-3</sup>) were obtained for the sample which aged at 525 °C for four hours, consequently the highest cutting force and surface roughness results were measured for this sample. Better hole surface quality and less burr formation were observed in the samples aged at 600 °C and 700 °C, and not-aged. On the other hand, while the highest value of corrosion potential were measured in the sample aged at 400 °C, the lowest corrosion potential value were measured in the sample aged at 700 °C.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"239 - 257"},"PeriodicalIF":1.5,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81663182","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