IF 2.1 3区材料科学

Strain Pub Date : 2021-03-03 DOI: 10.1111/str.12383

D. Millar, M. Mennu, K. Upadhyay, C. Morley, P. Ifju

{"title":"An improved direct shear characterisation technique for soft gelatinous and elastomeric materials","authors":"D. Millar, M. Mennu, K. Upadhyay, C. Morley, P. Ifju","doi":"10.1111/str.12383","DOIUrl":"https://doi.org/10.1111/str.12383","url":null,"abstract":"Soft materials such as hydrogels and elastomers exhibit very low stiffness and strength as well as large deformations, which makes their mechanical characterisation extremely difficult through conventional methods. This paper presents a novel experimental technique for the mechanical shear property characterisation of these materials. Agarose hydrogels were chosen as a model material for this study. The new in‐plane shear test method incorporates 3‐D‐printed acrylonitrile butadiene styrene (ABS) grips for specimen mounting and digital image correlation (DIC) for full‐field strain measurement on both sides of the specimen gauge section. These grips utilise barb‐like pegs to secure the specimen while load is applied. In order to evaluate the methodology, four concentrations of agarose hydrogel (4.0%, 2.5%, 1.5%, and 0.5% wt./solvent volume) were tested. Results for the agarose hydrogel demonstrated excellent repeatability. The obtained shear moduli show a monotonic increase with gel concentration. Furthermore, the range of shear moduli applicable to the novel testing method was determined.","PeriodicalId":51176,"journal":{"name":"Strain","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2021-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/str.12383","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47385930","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: 1

High strain rate elasto‐plasticity identification using the image‐based inertial impact (IBII) test part 1: Error quantification 使用基于图像的惯性冲击(IBII)测试的高应变率弹塑性识别第1部分:误差量化

IF 2.1 3区材料科学

Strain Pub Date : 2021-02-24 DOI: 10.1111/str.12375

L. Fletcher, F. Davis, S. Dreuilhe, A. Marek, F. Pierron

引用次数: 4

High strain rate elasto‐plasticity identification using the image‐based inertial impact (IBII) test part 2: Experimental validation 使用基于图像的惯性冲击（IBII）试验的高应变速率弹塑性识别第2部分：实验验证

IF 2.1 3区材料科学

Strain Pub Date : 2021-02-22 DOI: 10.1111/str.12374

L. Fletcher, F. Davis, S. Dreuilhe, A. Marek, F. Pierron

引用次数: 4

Development of a shear device for precise simple shear measurements of rubber mats 一种用于橡胶垫精确简单剪切测量的剪切装置的研制

IF 2.1 3区材料科学

Strain Pub Date : 2021-01-20 DOI: 10.1111/str.12376

Lars Kanzenbach, J. Ihlemann

引用次数: 1

Issue Information 问题信息

IF 2.1 3区材料科学

Strain Pub Date : 2021-01-15 DOI: 10.1111/str.12355

引用次数: 0

Measuring coarse grain deformation by digital image correlation 用数字图像相关法测量粗晶粒变形

IF 2.1 3区材料科学

Strain Pub Date : 2021-01-13 DOI: 10.1111/str.12378

C. Silvani, J. Réthoré, S. Nicaise

{"title":"Measuring coarse grain deformation by digital image correlation","authors":"C. Silvani, J. Réthoré, S. Nicaise","doi":"10.1111/str.12378","DOIUrl":"https://doi.org/10.1111/str.12378","url":null,"abstract":"This work presents results from oedometric compression of coarse granular material. Coarse granular media exhibit significant deformations making it complicated to predict the settlement of structures. In this paper, a measurement technique was developed for the analysis of two‐dimensional (2‐D) images of a deforming coarse granular medium to investigate its deformation. This was achieved by realising grain‐based image correlation to measure the grain transformation in gravel with the use of a digital image correlation technique. The 2‐D displacement fields enable us to explore the behaviour of granular media at different scales: microscopic, mesoscopic and macroscopic scales. The mesoscopic scale is defined from branches that connect the centres of three neighbouring grains, using a Delaunay triangulation to account for an equivalent continuum media. Whereas the consistency of the macroscopic strain and the average mesoscopic strain is assessed, it is shown that a deviation from the normalised microscopic vertical displacement is an indicator of the heterogeneity of the mesoscopic strain field. The proposed mesoscopic analysis allows us to investigate these heterogeneities. Another important result is that even if the amplitude of the microscopic strain is small (approximately 100 times smaller) compared with the other strain measures, it confirms that the grains are not rigid and that their ultimate strain can be estimated using the proposed approach.","PeriodicalId":51176,"journal":{"name":"Strain","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2021-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/str.12378","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47121423","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: 2

Quantitative evaluation of cumulative plastic damage for ferromagnetic steel under low cycle fatigue based on magnetic memory method 基于磁记忆法的铁磁性钢低周疲劳累积塑性损伤定量评价

IF 2.1 3区材料科学

Strain Pub Date : 2021-01-12 DOI: 10.1111/str.12379

S. Su, Xiaoping Ma, Wen Wang, Yiyi Yang, Jingyu Hu

{"title":"Quantitative evaluation of cumulative plastic damage for ferromagnetic steel under low cycle fatigue based on magnetic memory method","authors":"S. Su, Xiaoping Ma, Wen Wang, Yiyi Yang, Jingyu Hu","doi":"10.1111/str.12379","DOIUrl":"https://doi.org/10.1111/str.12379","url":null,"abstract":"Cumulative plastic damage caused during the low cycle fatigue (LCF) regime may seriously undermine the safety of the steel members and even lead to serious industrial accidents. Magnetic memory method (MMM), as a novel nondestructive testing technology, has been developed to evaluate the fatigue damage for the ferromagnetic material, but there is the lack of a quantitative description exists for the relationship between magnetic memory signals and cumulative plastic damage yet. In this paper, the strain‐based Jiles–Atherton hysteresis model under cyclic load during the LCF regime was established. Meanwhile, the LCF tests for S355 steel were performed, and the HSF signals on the surface of the specimen were collected under different loading cycles. Finite element (FE) simulations for coupling magnetic memory signals and cumulative plastic strain were carried out by the strain‐based Jiles–Atherton hysteresis model. Comparing with experimental results verifies the feasibility and accuracy of the FE method. The results indicate that the slope of the HSF signals fitting curve, K, as a characteristic parameter, has an exponential decrease as the cumulative plastic damage D increases. A general quantitative expression of the magneto‐damage model was built by discussing the influences of different factors on the K–D relation curves. It can be proved by verification that the magneto‐damage model provides a direct way for the quantitative evaluation of the cumulative plastic damage for the low‐carbon steel under LCF.","PeriodicalId":51176,"journal":{"name":"Strain","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2021-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/str.12379","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45926014","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: 7

Constitutive equation determination and dynamic numerical modelling of the compression deformation of concrete 混凝土压缩变形本构方程的确定及动态数值模拟

IF 2.1 3区材料科学

Strain Pub Date : 2021-01-07 DOI: 10.1111/str.12377

S. Seven, M. A. Çankaya, Cetin Uysal, A. Taşdemirci, S. Saatci, M. Güden

{"title":"Constitutive equation determination and dynamic numerical modelling of the compression deformation of concrete","authors":"S. Seven, M. A. Çankaya, Cetin Uysal, A. Taşdemirci, S. Saatci, M. Güden","doi":"10.1111/str.12377","DOIUrl":"https://doi.org/10.1111/str.12377","url":null,"abstract":"The dynamic compression deformation of an in‐house cast concrete (average aggregate size of 2–2.5 mm) was modelled using the finite element (FE), element‐free Galerkin (EFG) and smooth particle Galerkin (SPG) methods to determine their capabilities of capturing the dynamic deformation. The numerical results were validated with those of the experimental split Hopkinson pressure bar tests. Both EFG and FE methods overestimated the failure stress and strain values, while the SPG method underestimated the peak stress. SPG showed similar load capacity profile with the experiment. At initial stages of the loading, all methods present similar behaviour. Nonetheless, as the loading continues, the SPG method predicts closer agreement of deformation profile and force histories. The increase in strength at high strain rate was due to both the rate sensitivity and lateral inertia caused by the confinement effect. The inertia effect of the material especially is effective at lower strain values and the strain rate sensitivity of the concrete becomes significant at higher strain values.","PeriodicalId":51176,"journal":{"name":"Strain","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2021-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1111/str.12377","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42459330","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

Simultaneous fluid and solid density measurements in swelling clay using X‐ray microtomography and 3D particle tracking 使用X射线显微成像和3D粒子跟踪同时测量膨胀粘土中的流体和固体密度

IF 2.1 3区材料科学

Strain Pub Date : 2020-11-22 DOI: 10.1111/str.12373

F. Bernachy-Barbe, Kevin Alvarado

引用次数: 2

Issue Information 问题信息

IF 2.1 3区材料科学

Strain Pub Date : 2020-11-20 DOI: 10.1111/str.12324

引用次数: 0

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