Experimental Techniques最新文献_第9页

Liquid Jet Breakup and Penetration in a Gas Cross-Flow -An Experimental Study 气体横流中的液体射流破裂和穿透 - 实验研究

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-08-22 DOI: 10.1007/s40799-023-00668-8

M. Pourrousta, M. M. Larimi, M. Biglarian, P. Hedayati

{"title":"Liquid Jet Breakup and Penetration in a Gas Cross-Flow -An Experimental Study","authors":"M. Pourrousta, M. M. Larimi, M. Biglarian, P. Hedayati","doi":"10.1007/s40799-023-00668-8","DOIUrl":"10.1007/s40799-023-00668-8","url":null,"abstract":"<div><p>In the present study, an experimental platform is developed to study the behavior of the injected jet in a gas cross-flow applicable to different categories of fluid mechanics such as combustion. In all tests, water and air are used as jet and cross-flow gas, respectively. The main target of this work is to cover the higher range of momentum ratios and Weber numbers for the presentation of a more accurate equation for jet trajectory. To achieve a desirable scale of experiments, the range of momentum ratio is considered from 5 to 211 and the Weber number of gasses in all tests is between 1.1–19.1. For data mining and measurements, the shadowgraph method is used. It is shown that by increasing the momentum ratio (about 84%), the breakup point height is increased (about 94%). Three different types of breakups were observed in the tests. It observed that as the Weber number increases, the type of jet column mechanism changes. It also revealed that the type of breakup mechanism would not have a significant effect on the jet trajectory. In addition, it demonstrated that the momentum ratio parameter would have a decisive role in the direction of jet motion, and as the momentum ratio increases, the jet column height increases. Finally, an equation for the trajectory of jet flight under all test conditions is presented.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 3","pages":"449 - 459"},"PeriodicalIF":1.5,"publicationDate":"2023-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88016123","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

Numerical and Experimental Buckling Analysis for Circular Plates 圆板的数值和实验屈曲分析

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-08-22 DOI: 10.1007/s40799-023-00667-9

H. Akbulut, M. F. Bingöl

引用次数: 0

Frequency Based Substructuring and Coupling Enhancement Using Estimated Rotational Frequency Response Functions 使用估计的旋转频率响应函数进行基于频率的子结构和耦合增强

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-08-18 DOI: 10.1007/s40799-023-00670-0

W.I.I.W.I. Mirza, A. Kyprianou, T. A.N. da Silva, M.N.A. Rani

{"title":"Frequency Based Substructuring and Coupling Enhancement Using Estimated Rotational Frequency Response Functions","authors":"W.I.I.W.I. Mirza, A. Kyprianou, T. A.N. da Silva, M.N.A. Rani","doi":"10.1007/s40799-023-00670-0","DOIUrl":"10.1007/s40799-023-00670-0","url":null,"abstract":"<div><p>Accurate estimation of rotational frequency response functions (FRFs) is an essential element of successful structural coupling. It is well known that the experimental estimation of structural excitations is very difficult with current technology. This paper proposes a scheme to improve the performance of the frequency-based substructuring (FBS) method by estimating unmeasured FRFs, including those corresponding to rotational degrees of freedom, from a set of experimentally determined translational FRFs. More specifically, the modal parameters extracted by modal analysis (EMA) from the experimentally determined FRFs are used for model updating, modal expansion and FRF synthesis. For this purpose, an approximate modelling approach is proposed, where a simplified and approximate finite element model (ASFE) is developed and updated to accurately reproduce the experimental responses. A modal expansion basis is then constructed from the ASFE to expand the mode shapes using the system equivalent reduction and expansion process (SEREP). FRF synthesis is then used to derive unmeasured translational and rotational FRFs. The synthesised FRFs within the frequency range of interest agree well with the experimental FRFs. The synthesised full FRF matrix is then used with the FBS method to derive the response model for the coupled structure in a bottom-up modelling approach.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 3","pages":"423 - 437"},"PeriodicalIF":1.5,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77135805","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

Model Validation of Rigid Body Tilting of Deformed Spinning Discs with Spline-Guided Constraints 带花键引导约束的变形旋转盘刚体倾斜模型验证

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-07-20 DOI: 10.1007/s40799-023-00657-x

J. Xue, B. Ma, M. Chen, L. Yu, L. Zheng

引用次数: 0

Nine Point Bending Test Technique for Understanding of Sintered Silver Die Bonding Failure Mechanism 了解烧结银模粘结失效机理的九点弯曲测试技术

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-07-19 DOI: 10.1007/s40799-023-00664-y

K. Wakamoto, K. Fuji, T. Otsuka, K. Nakahara, T. Namazu

{"title":"Nine Point Bending Test Technique for Understanding of Sintered Silver Die Bonding Failure Mechanism","authors":"K. Wakamoto, K. Fuji, T. Otsuka, K. Nakahara, T. Namazu","doi":"10.1007/s40799-023-00664-y","DOIUrl":"10.1007/s40799-023-00664-y","url":null,"abstract":"<p>The Sintered silver (s–Ag) die degradation is commonly evaluated by thermal shocked test (TST), which evaluates the material’s durability against a heating/cooling cycle. Materials with different coefficient of thermal expansion (CTE) give rise to thermal out-of-plane deformation surrounding the bonding part, which deteriorates s–Ag die part by repeated thermal and mechanical stress during TST. For the safe and reliable design of s–Ag die toward long-term durability, the contribution of thermal and mechanical stresses to degradation should be understood separately. Clarify the overall s–Ag die degradation mechanism during TST compared to the new mechanical bending test that can apply out-of-plane deformation. The authors propose a new mechanical bending test technique, called the nine-point bending (NBT) test, which can provide out-of-plane deformation with a s–Ag die-attached specimen as TST like. By comparing NBT and TST, the degradation mechanism of the s–Ag die-attach element can be understood from both thermal and mechanical aspects. In scanning acoustic tomography (SAT) analysis, a similar degradation ratio between NBT and TST is obtained, which indicates that mechanical stress plays a significant role in deteriorating s–Ag die layer in TST. After 1000 cycles, however, cracking and s–Ag material aging coexist in TST only, destabilizing s–Ag die fracture. s–Ag main degradation cause in TST is clarified with mechanical stress by comparing NBT. In addition, thermally material aging destabilized the s–Ag degradation during TST.</p>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 3","pages":"399 - 408"},"PeriodicalIF":1.5,"publicationDate":"2023-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40799-023-00664-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74139435","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

Locating Impacts Through Structural Vibrations Using the FEEL Algorithm Without a Known Input Force 在没有已知输入力的情况下使用 FEEL 算法通过结构振动确定撞击位置

IF 1.5 4区工程技术

Experimental Techniques Pub Date : 2023-07-10 DOI: 10.1007/s40799-023-00662-0

B. T. Davis, Y. MejiaCruz

{"title":"Locating Impacts Through Structural Vibrations Using the FEEL Algorithm Without a Known Input Force","authors":"B. T. Davis, Y. MejiaCruz","doi":"10.1007/s40799-023-00662-0","DOIUrl":"10.1007/s40799-023-00662-0","url":null,"abstract":"<div><p>Floor vibration-based methods to track human activity are becoming popular for applications in healthcare monitoring, security, and occupant detection. Popular techniques such as time of arrival (TOA) methods face wave dispersion and multiple-path fading challenges for localization. Data-driven methodologies such as the FEEL Algorithm rely exclusively on the system dynamic properties, an advantage over other methods. However, FEEL’s calibration process requires recording force input to the structure, which can become labor-intensive and time-consuming for applications that require a high localization accuracy and does not require force estimates. An alternative approach is proposed to use the system’s acceleration response exclusively, creating an output-to-output transfer function. This modification was tested against the 3575 impact Human-Induced Vibration Benchmark dataset containing seven impact types across five locations, the same dataset FEEL was originally developed with. The results demonstrated the acceleration-calibrated FEEL effectiveness with 99.9% localization accuracy compared to force-calibrated FEEL’s accuracy of 96.4%.</p></div>","PeriodicalId":553,"journal":{"name":"Experimental Techniques","volume":"48 2","pages":"359 - 368"},"PeriodicalIF":1.5,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91082492","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

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