Procedia IUTAM最新文献_第9页

Modeling the Effect of Beam Shaping at Selective Laser Melting 选择性激光熔化过程中光束整形效应的建模

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.06.015

C.E. Protasov, A.V. Gusarov

引用次数: 0

On the Analysis of Chatter in Mechanical Systems with Impacts 有冲击的机械系统颤振分析

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.03.004

Harry Dankowicz, Erika Fotsch

引用次数: 18

In Situ Observation of Strained Bands and Ductile Damage in Thin AA2139-T3 Alloy Sheets AA2139-T3合金薄板应变带及韧性损伤的原位观察

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.03.009

Ante Buljac , Thibault Taillandier-Thomas , Thilo F. Morgeneyer , Lukas Helfen , Stéphane Roux , François Hild

{"title":"In Situ Observation of Strained Bands and Ductile Damage in Thin AA2139-T3 Alloy Sheets","authors":"Ante Buljac , Thibault Taillandier-Thomas , Thilo F. Morgeneyer , Lukas Helfen , Stéphane Roux , François Hild","doi":"10.1016/j.piutam.2017.03.009","DOIUrl":"10.1016/j.piutam.2017.03.009","url":null,"abstract":"<div><p>The interactions between plasticity and damage mechanisms are not clearly established concerning the fracture of ductile sheet materials (<em>e.g.</em>, flat to slant transition). The question addressed herein is to elucidate which mechanism is responsible for localized phenomena leading to the final failure. A mechanical test carried out on a notched plate made of 2139-T3 aluminum alloy is imaged thanks to synchrotron laminography at micrometer resolution. Ductile damage (<em>i.e.</em>, void nucleation, growth and coalescence) is analyzed via reconstructed volumes. Although the low volume fraction of secondary phases in the tested alloy is challenging, digital volume correlation is also utilized to measure displacement fields and estimate strain fields in the bulk of the alloy during the whole test. In the first part of this study, the resolution of the measurement technique is assessed under such conditions. Then strained bands are shown to occur very early on in what will be the slant region of the fracture path. Conversely, damage grows at very late loading steps.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"20 ","pages":"Pages 66-72"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.03.009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55244490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Teaching Physics through Experimental Projects 实验式物理教学

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.03.026

Catalina Stern, Carlos Echeverría, David Porta

引用次数: 14

Influence of Workpiece Imbalance on Regenerative and Frictional Grinding Chatters 工件不平衡对再生和摩擦磨削颤振的影响

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.019

Yao Yan , Jian Xu , Marian Wiercigroch

引用次数: 8

REMOVED: Extraction of distortion-product otoacoustic emission source components and its relevance for objective audiometry 删除:提取失真产物耳声发射源成分及其与客观测听的相关性

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.08.041

Dennis Zelle, Anthony W. Gummer, Ernst Dalhoff

引用次数: 1

Computation of the Starting Vortex Flow Past a Flat Plate 平板起始涡旋流动的计算

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.03.019

Ling Xu , Monika Nitsche , Robert Krasny

{"title":"Computation of the Starting Vortex Flow Past a Flat Plate","authors":"Ling Xu , Monika Nitsche , Robert Krasny","doi":"10.1016/j.piutam.2017.03.019","DOIUrl":"10.1016/j.piutam.2017.03.019","url":null,"abstract":"<div><p>This paper compares two numerical methods applied to compute the starting vortex flow past a flat plate. The plate is inclined relative to a constant background flow at angle α, with α = 90°, 60°, 30°. The numerical methods considered are (1) direct numerical simulation of the viscous flow (DNS), and (2) an inviscid vortex sheet model. The viscous DNS solves the Navier- Stokes equations by an operator splitting finite-difference method, for Reynolds numbers <em>Re</em> = 250, 500, 1000, 2000. The inviscid flow is computed by a regularized vortex sheet method, with the unsteady Kutta condition imposed at the edges of the plate, for regularization parameters δ = 0.2, 0.1, 0.05. We present viscous vorticity contours, and compare streaklines and shed circulation obtained with both methods. Good agreement is found in the large-scale features of the separated spiral streaklines and the shed circulation as <em>Re</em> increases and δ decreases. For small inclination angle α, secondary separation on the downwind side of the plate introduces small-scale features in the viscous flow that are absent in the inviscid model. The vortex sheet model is much less costly than the viscous DNS, but it is limited by the omission of the boundary layers present in the viscous flow.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"20 ","pages":"Pages 136-143"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.03.019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55245107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Size-dependent Phase Transformation and Fracture of ZnO Nanowires ZnO纳米线的相变与断裂

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.03.041

Jianying He , Jianyang Wu , Shijo Nagao , Lijie Qiao , Zhiliang Zhang

引用次数: 2

Growing Solids and Thin-Walled Structures 生长固体和薄壁结构

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.06.002

S. Lychev , H. Altenbach

引用次数: 4

Development of Laser Beam Modulation Assets for the Process Productivity Improvement of Selective Laser Melting 提高选择性激光熔化工艺生产率的激光束调制设备的开发

Procedia IUTAM Pub Date : 2017-01-01 DOI: 10.1016/j.piutam.2017.06.019

A.A. Okunkova , P.Yu. Peretyagin , P.A. Podrabinnik , I.V. Zhirnov , A.V. Gusarov

引用次数: 9