Strain最新文献 - Book学术

An artificial neural network for digital image correlation dynamic subset selection based on speckle pattern quality metrics 基于斑点模式质量指标的数字图像相关动态子集选择人工神经网络

IF 2.1 3区材料科学

Strain Pub Date : 2023-12-21 DOI: 10.1111/str.12471

D. Atkinson, M. van Rooyen, T. H. Becker

{"title":"An artificial neural network for digital image correlation dynamic subset selection based on speckle pattern quality metrics","authors":"D. Atkinson, M. van Rooyen, T. H. Becker","doi":"10.1111/str.12471","DOIUrl":"https://doi.org/10.1111/str.12471","url":null,"abstract":"Precise and accurate digital image correlation computed displacement data requires sufficient noise suppression and spatial resolution, which improve and diminish, respectively, with increased subset size. Furthermore, spatially varying speckle pattern quality and displacement field complexity ideally necessitate a location‐specific optimal subset size to obtain a favourable compromise between noise suppression and spatial resolution. Although dynamic subset selection (DSS) methods have been proposed based on speckle pattern quality metrics (SPQMs), they do not ensure such a favourable compromise.This work investigates using an artificial neural network (ANN) for DSS. An ANN is trained to predict the displacement error standard deviation of a subset from multiple SPQMs and the standard deviation of image noise, such that the smallest subset offering sufficient noise suppression, dictated by a displacement error standard deviation threshold, is appointed.Validation, both within and outside the domain of the training images, shows that the smallest subset providing sufficient noise suppression offers a favourable compromise for up to moderate displacement gradients. Additionally, the proposed method is shown to perform with greater consistency and reliability relative to existing SPQM‐based DSS methods.The novel proposition lies in utilising an ANN as an error prediction tool, based on multiple SPQMs, and hence, is an attractive alternative for DSS.","PeriodicalId":51176,"journal":{"name":"Strain","volume":"66 11","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138953113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comparative study of Glinka and Neuber approaches for fatigue strength assessment on 42CrMoS4‐QT specimens 对 42CrMoS4-QT 试样进行疲劳强度评估的格林卡和纽伯方法比较研究

IF 2.1 3区材料科学

Strain Pub Date : 2023-12-20 DOI: 10.1111/str.12470

Philipp Thumann, Stefan Buchner, Steffen Marburg, Marcus Wagner

{"title":"A comparative study of Glinka and Neuber approaches for fatigue strength assessment on 42CrMoS4‐QT specimens","authors":"Philipp Thumann, Stefan Buchner, Steffen Marburg, Marcus Wagner","doi":"10.1111/str.12470","DOIUrl":"https://doi.org/10.1111/str.12470","url":null,"abstract":"In fatigue strength assessment, the methods based on ideal elastic stresses according to Basquin and the less established method based on elastic‐plastic stress quantities according to Manson, Coffin and Morrow are applied. The former calculates loads using linear‐elastic stresses, the latter requires elastic‐plastic evaluation parameters, such as stresses and strains. These can be determined by finite element analysis (FEA) with a linear‐elastic constitutive law, and subsequent conversion to elastic‐plastic loads, using the macro support formula by Neuber. In this contribution, an alternative approach to approximate elastic‐plastic parameters proposed by Glinka is compared to the the strain‐life method using Neuber's formula, as well as the stress‐life method of Basquin. Several component tests on 42CrMoS4‐QT specimens are investigated. To determine the input data for the fatigue strength evaluations, the entire test setup is computed by FEA. The nodal displacements from these validated full‐model simulations are used as boundary conditions for a submodel simulation of a notch, whose results serve as input for the fatigue strength assessments. It is shown that all approaches provide a reliable assessment of components. Our key result is that the strain‐life method using the concept by Glinka for notch stress computation, yields improved results in fatigue strength assessments.","PeriodicalId":51176,"journal":{"name":"Strain","volume":"96 9","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138954147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biaxial expansion due to compression experiments for measuring the failure strain of tubular samples 测量管状样品破坏应变的压缩双轴膨胀实验

IF 2.1 3区材料科学

Strain Pub Date : 2023-08-31 DOI: 10.1111/str.12462

M. Bono, A. Zouari, T. Le Jolu, D. Le Boulch, H. Tabouret, J. Crépin, J. Besson

{"title":"Biaxial expansion due to compression experiments for measuring the failure strain of tubular samples","authors":"M. Bono, A. Zouari, T. Le Jolu, D. Le Boulch, H. Tabouret, J. Crépin, J. Besson","doi":"10.1111/str.12462","DOIUrl":"https://doi.org/10.1111/str.12462","url":null,"abstract":"The failure strain of a tube is a function of the biaxial strain ratio (axial strain/hoop strain) to which it is subjected. The relationship between failure strain and the strain ratio can be determined experimentally using expansion due to compression tests with a tensile load (EDCT), in which a ductile pellet placed inside the tube is compressed axially so it expands in diameter and imposes a hoop strain on the tube. At the same time, a tensile load on the ends of the tube creates an axial strain. This study investigates the capabilities and limitations of EDCT tests using two devices that allow experiments to be performed on a standard tensile testing machine. The first device applies an axial force on the ends of the sample, and the second device applies an axial displacement. Tests on zirconium alloy tubes confirmed that the failure strain is dependent on the strain ratio and the metallurgical state of the material. EDCT tests can produce a range of strain ratios, but there is an upper limit on the strain ratio that can be obtained, and it is dependent on the plastic behaviour of the sample and the friction conditions between the components.","PeriodicalId":51176,"journal":{"name":"Strain","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48775850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","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 use of an induced temperature gradient and full‐field measurements to investigate and model the thermomechanical behaviour of an austenitic stainless steel 316 关于使用感应温度梯度和全场测量来研究和模拟奥氏体不锈钢316的热机械行为

IF 2.1 3区材料科学

Strain Pub Date : 2023-07-30 DOI: 10.1111/str.12460

G. C. Soares, Arturo Rubio Ruiz, M. Hokka

引用次数: 0

Numerical and experimental investigation of the residual stress distribution of internal thread cold extrusion and tap wear 内螺纹冷挤压及丝锥磨损残余应力分布的数值与实验研究

IF 2.1 3区材料科学

Strain Pub Date : 2023-07-27 DOI: 10.1111/str.12459

Nianqing Wan, Qiang He, X. Jing, Yonggang Jiang, Honggen Zhou

引用次数: 0

Unified digital image correlation under meshfree framework 无网格框架下的统一数字图像相关

IF 2.1 3区材料科学

Strain Pub Date : 2023-07-27 DOI: 10.1111/str.12461

Bin Chen, S. Coppieters

引用次数: 0

Optimisation of sample geometry for thermo‐mechanical testing of precipitation hardenable nickel‐based superalloys with an ETMT machine 用ETMT机器优化可沉淀硬化镍基高温合金热力学测试的样品几何形状

IF 2.1 3区材料科学

Strain Pub Date : 2023-07-17 DOI: 10.1111/str.12458

M. King, S. Rahimi

引用次数: 0

Classification of the acquisition conditions driving the accuracy of strain measurements during in situ DIC with scanning electron microscope 扫描电子显微镜原位DIC过程中驱动应变测量精度的采集条件分类

IF 2.1 3区材料科学

Strain Pub Date : 2023-07-13 DOI: 10.1111/str.12456

J. Goulmy, F. Guittonneau, S. Jégou, L. Barrallier

引用次数: 0

Residual stresses in Cu matrix composite surface deposits after laser melt injection 激光熔喷后Cu基复合材料表面沉积物中的残余应力

IF 2.1 3区材料科学

Strain Pub Date : 2023-07-06 DOI: 10.1111/str.12457

Xingxing Zhang, J. Kornmeier, Michael Hofmann, Anika Langebeck, S. Alameddin, Renan Pereira Alessio, F. Fritzen, J. Bunn, S. Cabeza

{"title":"Residual stresses in Cu matrix composite surface deposits after laser melt injection","authors":"Xingxing Zhang, J. Kornmeier, Michael Hofmann, Anika Langebeck, S. Alameddin, Renan Pereira Alessio, F. Fritzen, J. Bunn, S. Cabeza","doi":"10.1111/str.12457","DOIUrl":"https://doi.org/10.1111/str.12457","url":null,"abstract":"Tungsten carbide particles reinforced metal matrix composite (MMC) coatings can significantly improve surface wear resistance owing to their increased surface hardness. However, the presence of macro‐ and micro‐residual stresses in MMC coatings can have detrimental effects, such as reducing service life. In this study, neutron diffraction was used to determine the residual stresses in spherical fused tungsten carbide (sFTC) reinforced Cu matrix composite surface deposits after laser melt injection. We also developed a thermo‐mechanical coupled finite element model to predict residual stresses. Our findings reveal that sFTC/Cu composite deposits produced with a preheating temperature of 400°C have low residual stresses, with a maximum tensile residual stress of 98 MPa in the Cu matrix on the top surface. In contrast, the sFTC/bronze (CuAl10Ni5Fe4) composite deposit exhibits very high residual stresses, with a maximum tensile residual stress in the Cu matrix on the top surface reaching 651 MPa. These results provide a better understanding of the magnitudes and distributions of residual stresses in sFTC‐reinforced Cu matrix composite surface deposits manufactured via laser melt injection.","PeriodicalId":51176,"journal":{"name":"Strain","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49439833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of high‐performance DIC for a comprehensive evaluation of biaxial fatigue crack growth experiments 应用高性能DIC对双轴疲劳裂纹扩展实验进行综合评价

IF 2.1 3区材料科学

Strain Pub Date : 2023-06-29 DOI: 10.1111/str.12455

A. Blug, F. Conrad, A. Bertz, C. Kontermann, D. Carl, M. Oechsner

{"title":"Application of high‐performance DIC for a comprehensive evaluation of biaxial fatigue crack growth experiments","authors":"A. Blug, F. Conrad, A. Bertz, C. Kontermann, D. Carl, M. Oechsner","doi":"10.1111/str.12455","DOIUrl":"https://doi.org/10.1111/str.12455","url":null,"abstract":"Precise determination of the remaining service life of technical components requires sufficient knowledge of fatigue crack growth behaviour and the growth rate of defects. Cracks in real components often experience multiaxial far field stresses due to their complex geometry and composite loadings acting on it. Digital image correlation (DIC) is well established for crack length and displacement measurements, but it usually requires sample preparation with speckle paint and interferes with mechanical extensometers. To overcome these limitations, we use a novel 2D DIC system combining a graphics processing unit (GPU) with a CoaXPress 2.0 camera, acquiring up to 3 GB/s of image data. It enables real‐time evaluation of both integral strain like an extensometer and full‐field DIC on images selected automatically in real‐time. This combination enables the use of one single sensor for strain‐controlled testing and fatigue crack growth characterisation. The full‐field displacement is compared to a finite‐element model (FEM) simulating the actual crack contour measured by the DIC system. The results show that high‐performance DIC has the potential to simultaneously simplify crack‐growth experiments and provide comprehensive fracture mechanical information.","PeriodicalId":51176,"journal":{"name":"Strain","volume":"1 1","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41386486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0