Strain最新文献_第6页

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IF 2.1 3区材料科学

Strain Pub Date : 2022-01-07 DOI: 10.1111/str.12390

引用次数: 0

Experimental strain‐based vibration control to obtain the fatigue strain limit by the staircase method 基于实验应变的振动控制，采用阶梯法获得疲劳应变极限

IF 2.1 3区材料科学

Strain Pub Date : 2022-01-06 DOI: 10.1111/str.12408

Lu Shi, L. Khalij, C. Gautrelet

引用次数: 3

Peen forming and stress peen forming of rectangular 2024–T3 aluminium sheets: Curvatures, natural curvatures and residual stresses 矩形2024-T3铝板的喷丸成形和应力喷丸成形:曲率、自然曲率和残余应力

IF 2.1 3区材料科学

Strain Pub Date : 2021-12-30 DOI: 10.1111/str.12405

Pierre A. Faucheux, H. Miao, M. Lévesque, F. Gosselin

{"title":"Peen forming and stress peen forming of rectangular 2024–T3 aluminium sheets: Curvatures, natural curvatures and residual stresses","authors":"Pierre A. Faucheux, H. Miao, M. Lévesque, F. Gosselin","doi":"10.1111/str.12405","DOIUrl":"https://doi.org/10.1111/str.12405","url":null,"abstract":"Aluminium skins on the lower wings of most commercial aircraft are shaped using shot peen forming. This process, which involves bombarding the skins with hard shot, uses nonuniform plastic flow to induce curvatures—in the same way that differential expansion makes metal bilayers bend when heated. Here, we investigate experimentally how constraining conditions affect the final shape of peen formed parts. We report peen forming experiments for 4.9‐mm‐thick rectangular 2024–T3 aluminium sheets of different aspect ratios uniformly shot peened on one face with a low intensity saturation treatment. Some specimens were free to deform during peening while others were elastically prestressed in a four‐point bending jig. For each aspect ratio and prestress condition, residual stresses were measured near the peened surface with the hole drilling method. Additional residual stress profiles were also obtained with the slitting method. The residual stress measurements show that the progressive deformation of unconstrained specimens had the same effect as an externally applied prestress. For the peening conditions investigated, this progressive deformation caused unconstrained strips to exhibit curvatures 33% larger than identical strips held flat during peening. Furthermore, we found that the relative importance of material anisotropy and geometric effects did determine the bending direction of unconstrained specimens.","PeriodicalId":51176,"journal":{"name":"Strain","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45564291","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

Assessment of the heterogeneous microstructure in the vicinity of a weld using thermographic measurements of the full‐field dissipative heat source 使用全场耗散热源的热成像测量评估焊缝附近的非均匀微观结构

IF 2.1 3区材料科学

Strain Pub Date : 2021-12-22 DOI: 10.1111/str.12406

Palaniappan Jaya Seelan, F. Pierron, J. Dulieu‐Barton

{"title":"Assessment of the heterogeneous microstructure in the vicinity of a weld using thermographic measurements of the full‐field dissipative heat source","authors":"Palaniappan Jaya Seelan, F. Pierron, J. Dulieu‐Barton","doi":"10.1111/str.12406","DOIUrl":"https://doi.org/10.1111/str.12406","url":null,"abstract":"During a material deformation process, part of the mechanical energy is dissipated as heat due to thermodynamically irreversible processes occurring at the microscale of the material. In particular, part of the plastic deformation energy is transformed into heat and is referred to as ‘intrinsic dissipation’ as it is intrinsic to the material behaviour. The intrinsic dissipation is a heat source that is sensitive to microstructural states which can be used to identify different microstructural regions resulting from material processing such as welding. To determine the heat source in a full‐field manner, it is necessary to use an infrared camera to measure any temperature rise in a specimen undergoing elastic cyclic loading. Unlike the intrinsic dissipative heat source, the temperature change is sensitive to thermal exchanges with the surroundings. Hence, the thermomechanical heat diffusion equation is used to determine the full‐field dissipative heat from the thermographic temperature measurement by implementing an image processing procedure based on least squares fitting enabled by specially devised experimental approach. The procedure is verified by deriving both the thermoelastic and dissipative heat sources from a ‘hole‐in‐plate’ specimen manufactured from 316L stainless steel, that is, a specimen with a known stress distribution. The approach is then applied to a 316L laser welded specimen, and it is demonstrated that the different microstructures resulting from the welding process can be identified with the procedure. The heterogeneous microstructure is confirmed using micrographs and further verified by the different stress–strain behaviour obtained for each microstructural region using digital image correlation (DIC).","PeriodicalId":51176,"journal":{"name":"Strain","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47357795","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

Using laser marking to engrave optimal patterns for in‐plane displacement and strain measurement 使用激光标记雕刻平面内位移和应变测量的最佳图案

IF 2.1 3区材料科学

Strain Pub Date : 2021-12-13 DOI: 10.1111/str.12404

Quentin Bouyra, B. Blaysat, H. Chanal, M. Grédiac

引用次数: 5

Issue Information 问题信息

IF 2.1 3区材料科学

Strain Pub Date : 2021-11-02 DOI: 10.1111/str.12360

引用次数: 0

Measuring true stress–strain curves of cylindrical bar samples with mirror‐assisted multi‐view digital image correlation 用镜面辅助的多视点数字图像相关技术测量圆柱杆样品的真应力-应变曲线

IF 2.1 3区材料科学

Strain Pub Date : 2021-11-02 DOI: 10.1111/str.12403

Bin Chen, B. Pan

引用次数: 7

Experimental investigation on the concrete fracture process zone using electronic speckle pattern interferometry 电子散斑干涉法对混凝土断裂过程区的实验研究

IF 2.1 3区材料科学

Strain Pub Date : 2021-10-10 DOI: 10.1111/str.12402

Xingzhen Huang, Hongniao Chen, Bin Sun

{"title":"Experimental investigation on the concrete fracture process zone using electronic speckle pattern interferometry","authors":"Xingzhen Huang, Hongniao Chen, Bin Sun","doi":"10.1111/str.12402","DOIUrl":"https://doi.org/10.1111/str.12402","url":null,"abstract":"In order to advance the understanding of fracture failure mechanisms in concrete, a series of three‐point bend tests of pre‐notched specimens were conducted to study the characteristics of the fracture process zone. Electronic speckle pattern interferometry (ESPI) was used to determine the location and size of the cracks. The experimental results have shown that crack in the pre‐notched concrete beams will initiate when the load increases to 40% of the peak load (Pmax) and expands unstably after reaching the peak load. When the load drops to about 25% Pmax in the load drop section, a complete fracture process zone (FPZ) was developed, and the corresponding crack tip opening displacement is about 7.1 times to the critical crack tip opening displacement. The analysis of surface strain of concrete specimen showed that microcracks will initiate when the surface tensile strain of concrete reaches about 2 × 10−4; when the surface tensile strain value of concrete reaches 4 × 10−2, the FPZ will move forward; the length of the FPZ of concrete essentially remains the same in the entire fracture process, which is about 71% of the ligament height. The analysis of experimental data also shows that the size of the FPZ is not significantly affected by the cubic compressive strength of concrete. In addition, the tension‐softening curves of the specimens were finally determined by using the incremental displacement collocation method, and it is concluded that the critical width of the FPZ is related to the cubic compressive strength of the concrete.","PeriodicalId":51176,"journal":{"name":"Strain","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2021-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43719932","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: 3

Issue Information 问题信息

IF 2.1 3区材料科学

Strain Pub Date : 2021-09-17 DOI: 10.1111/str.12359

引用次数: 0

Investigating the accuracy of digital image correlation in monitoring strain fields across historical tapestries 探讨数字图像相关在监测历史挂毯应变场中的准确性

IF 2.1 3区材料科学

Strain Pub Date : 2021-09-13 DOI: 10.1111/str.12401

K. Nwanoro, P. Harrison, F. Lennard

引用次数: 6