Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA最新文献_第2页

Edge Profiling of Titanium Alloys and Attainable Surface Quality 钛合金的边缘轮廓和可达到的表面质量

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6425

S. Kannan, L. Kui, S. Pervaiz, Vincent Shantha Kumar, R. Karthikeyan

{"title":"Edge Profiling of Titanium Alloys and Attainable Surface Quality","authors":"S. Kannan, L. Kui, S. Pervaiz, Vincent Shantha Kumar, R. Karthikeyan","doi":"10.1115/MSEC2018-6425","DOIUrl":"https://doi.org/10.1115/MSEC2018-6425","url":null,"abstract":"Machining operations such as reaming, boring or milling create undesirable extruded sharp edges at the entry and exit side of the machined holes. These sharp burrs / extruded edges act as stress concentration regions for fatigue crack propagation in safety critical aerospace components. In this paper, results of an experimental investigation carried out on surface integrity of titanium based alloy during mechanized edge profiling process are presented. In the Mechanized Edge Profiling (MEP) process the primary sharp edges created as result of hole machining are removed using a hard point countersink tool and the secondary sharp edges produced due to countersinking/chamfering the hole entry and exit side edges are radiused using nylon impregnated silicon carbide brushes. On-machine edge profiling experiments were conducted using compliant Flexhone™ and Novoflex™ globular abrasive brushes on highly stressed bolt/flange holes. Brushing speed and feed rate were identified as key process variables. Nylon impregnated with silicon carbide 320 grit brush showed good performance when brushing at a speed of 5000rpm and 5000mm/min feed rate which produced a very consistent and controlled secondary edge radius of 0.3±0.2mm up to 30 holes. An acceptable surface roughness (Ra) of less than 0.5μm on the chamfer and bore surfaces were achieved.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132795283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Developments and Analyses of Alternative Processes for the Manufacturing of Fiber Metal Laminates 金属纤维层压板制造替代工艺的发展与分析

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6447

Thomas Mennecart, H. Werner, N. Khalifa, K. Weidenmann

引用次数: 14

Electrohydrodynamic Casting Polymeric Carbon Nanofibers From Different Precursors for the Hyperthermia Application 电流体动力铸造不同前体聚合物碳纳米纤维的热疗应用

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6350

N. N. Boutros, A. Chen, Ryan N. Gan, Y. Gan

引用次数: 1

Gaussian Process Model for Touch Probing 触摸探测的高斯过程模型

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6548

Xilu Wang, Xiaoping Qian

引用次数: 1

Stress State Control by a Novel Bending Process and its Effect on Damage Evolution 新型弯曲过程的应力状态控制及其对损伤演化的影响

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6349

R. Meya, C. Löbbe, A. Tekkaya

引用次数: 8

Current-Dependent Kinetics of Self-Folding for Multi-Layer Polymers Using Local Resistive Heating 基于局部电阻加热的多层聚合物自折叠的电流依赖动力学

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6628

Moataz Elsisy, Evan Poska, M. Bedewy

{"title":"Current-Dependent Kinetics of Self-Folding for Multi-Layer Polymers Using Local Resistive Heating","authors":"Moataz Elsisy, Evan Poska, M. Bedewy","doi":"10.1115/MSEC2018-6628","DOIUrl":"https://doi.org/10.1115/MSEC2018-6628","url":null,"abstract":"The purpose of this paper is to characterize the kinetics and direction of self-folding of pre-strained polystyrene (PSPS) and non-pre-strained styrene (NPS), which results from local shrinkage using a resistively heated ribbon in contact with the polymer sheet. A temperature gradient across the thickness of this shape memory polymer (SMP) sheet induces folding along the line of contact with the heating ribbon. Varying the electric current changes the degree of folding and extent of local material flow. This method can be used to create practical 3D structures. Sheets of PSPS and NPS were cut to 10 × 20 mm samples and their folding angles were plotted with respect to time, as obtained from in situ videography. In addition, the use of polyimide tape (Kapton) was investigated for controlling the direction of self-folding. Results show that folding happens on the opposite side of the sample with respect to the tape, regardless of which side the heating ribbon is on, or whether gravity is opposing the folding direction. Given the tunability of fold times and extent of local material flow, heat-assisted folding is a promising approach for manufacturing complex 3D lightweight structures by origami engineering.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127332061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Numerical Modeling of Thermo-Fluid Flow and Metal Mixing in Laser Keyhole Welding of Dissimilar Metals 异种金属激光锁孔焊接热流体流动及金属混合数值模拟

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6640

W. Tan, Wenkang Huang

引用次数: 1

Shape Memory Behavior of Carbon Composites With Functional Interlayer 含功能夹层碳复合材料的形状记忆行为

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6449

L. Santo, L. Iorio, G. Tedde, F. Quadrini

引用次数: 3

Design of an Octo-Strain Specimen for Biaxial Tension Testing 用于双轴拉伸试验的八应变试样的设计

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6612

Justin L. Milner, T. Gnäupel-Herold

{"title":"Design of an Octo-Strain Specimen for Biaxial Tension Testing","authors":"Justin L. Milner, T. Gnäupel-Herold","doi":"10.1115/MSEC2018-6612","DOIUrl":"https://doi.org/10.1115/MSEC2018-6612","url":null,"abstract":"A custom biaxial testing fixture was designed to evaluate a new specimen geometry for complex loading paths. Biaxial testing is commonly used to evaluate work-hardening behavior of sheet metal in biaxial tension to study the accumulation of plastic strains to determine the anisotropic yield loci. The current state-of-the-art specimen geometry that is used for biaxial testing is the cruciform specimen. Cruciform specimens are machined into a geometry that resembles a cross with four arms arranged at 90 degrees. However, this geometry is prone to premature failure and non-homogenous strain distribution within the gauge region. These problems persist even with the addition of complex features (e.g., slits and multi-step pockets). Therefore, the primary goal of the new specimen geometry is to achieve a large and uniform strain field within the gauge region. One of the main problems of the cruciform specimen is the formation of stress concentration within the gauge region. Therefore, the proposed specimen geometry is comprised of four additional arms between the existing cruciform arms. This geometry is termed an ‘Octo-Strain’ specimen after the eight arms that are arranged in a 45-degree planar pattern. It is hypothesized that the additional arms will stabilize the stress concentrations and, thus, achieve increased failure strain and uniformity as compared to the cruciform geometry. This work focuses on the comparison of the cruciform specimen to the Octo-Strain specimen during balanced biaxial deformation of mild steel. It is found that the Octo-Strain specimen achieved twice the failure strain and increased strain uniformity within the gauge region as compared to the cruciform specimen.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117106754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Boundary Slope Control in Topology Optimization for Additive Manufacturing 增材制造拓扑优化中的边界斜率控制

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6399

Cunfu Wang, Xiaoping Qian, W. Gerstler, Jeff Shubrooks

{"title":"Boundary Slope Control in Topology Optimization for Additive Manufacturing","authors":"Cunfu Wang, Xiaoping Qian, W. Gerstler, Jeff Shubrooks","doi":"10.1115/MSEC2018-6399","DOIUrl":"https://doi.org/10.1115/MSEC2018-6399","url":null,"abstract":"The paper studies how to control boundary slope of optimized parts in density-based topology optimization for additive manufacturing (AM). Boundary slope of a part affects the amount of support structure required during its fabrication by additive processes. Boundary slope also has direct relation with the resulting surface roughness from the AM processes, which in turn affects the heat transfer efficiency. By constraining the minimal boundary slope, support structures can be eliminated or reduced for AM, and thus material and post-processing costs are reduced; by constraining the maximal boundary slope, high surface roughness can be attained, and thus the heat transfer efficiency is increased. In this paper, the boundary slope is controlled through a constraint between the density gradient and the given build direction. This allows us to explicitly control the boundary slope through density gradient in the density-based topology optimization approach. We control the boundary slope through a single global constraint. Numerical examples on heat conduction problem, and coupled 2D and 3D thermoelastic problems demonstrate the effectiveness and efficiency of the proposed formulation in controlling boundary slopes for additive manufacturing.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117233228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3