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

Thermal-Mechanical Numerical Modeling of the Friction Element Welding Process 摩擦元件焊接过程的热-力学数值模拟

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6692

Ankit Varma, S. Absar, Xin Zhao, Hongseok Choi, T. Abke, J. Skovron, Brandt J. Ruszkiewicz, L. Mears

引用次数: 2

A Model for Hyper-Elastic Material Behavior Under Thermal Aging With an Application to Natural Rubber 热老化下超弹性材料性能模型及其在天然橡胶中的应用

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6539

A. Korba, Abhishek Kumar, M. Barkey

{"title":"A Model for Hyper-Elastic Material Behavior Under Thermal Aging With an Application to Natural Rubber","authors":"A. Korba, Abhishek Kumar, M. Barkey","doi":"10.1115/MSEC2018-6539","DOIUrl":"https://doi.org/10.1115/MSEC2018-6539","url":null,"abstract":"Numerous hyper-elastic theoretical material models have been proposed over the past 60 years to capture the stress-strain behavior of large deformation incompressible isotropic materials. Among them, however, only few models have considered the thermal aging effect on model parameters. Having a simple, closed-form equation that includes the effect of aging temperature and time in describing the stress-strain behavior could facilitate fatigue analysis and life time prediction of rubber-like materials. In this vein, this paper defines a new and simple Weight Function Based (WFB) model that describes hyper-elastic materials’ behavior as a function of aging time and temperature variations. More than 130 natural rubber specimens were thermally aged in an oven and tested under uni-axial loading to observe their stress-strain behavior at various temperatures and aging times. The temperature ranged from 76.7 °C to 115.5 °C, and the aging time from zero to 600 hours. The proposed WFB model is based on the Yeoh model and basic continuum mechanics assumptions, and it was applied to the tested natural rubber materials. Moreover, it was verified against Treloar’s historic tensile test data for uni-axial tension of vulcanized natural rubber material, and also compared to the Ogden and the Yeoh models. A non-linear least square optimization tool in Matlab was used to determine all hyper-elastic material model parameters and all other fitting purposes. The proposed model has better accuracy in fitting Treloar’s data compared to the Ogden and the Yeoh models using the same fitting tool under the same initial numerical conditions.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"151 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":"116401528","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

Preparation of Thick Ni/Al Reactive Multilayer Films and Prospective Use for Self-Powered Brazing of Ti-6Al-4V Ni/Al反应多层厚膜的制备及其在Ti-6Al-4V自供电钎焊中的应用

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6627

D. Bridges, Ying Ma, Cary D. Smith, Zhili Zhang, A. Hu, C. Rouleau, Z. Gosser, K. Hong, Jinquan Cheng, Y. Bar-Cohen

{"title":"Preparation of Thick Ni/Al Reactive Multilayer Films and Prospective Use for Self-Powered Brazing of Ti-6Al-4V","authors":"D. Bridges, Ying Ma, Cary D. Smith, Zhili Zhang, A. Hu, C. Rouleau, Z. Gosser, K. Hong, Jinquan Cheng, Y. Bar-Cohen","doi":"10.1115/MSEC2018-6627","DOIUrl":"https://doi.org/10.1115/MSEC2018-6627","url":null,"abstract":"In this study we demonstrate a new method for depositing thick reactive multilayer films (RMFs) (thickness > 14 μm) by using Ti interlayer integration and substrate preheating during fabrication. These two adjustments are designed to alleviate internal planar stresses that cause delamination between deposited layers and peeling off the substrate. Decreasing the distance between Ti interlayers helps to eliminate delamination between deposited layers. Through high speed camera measurements, the reaction propagation speed of an RMF sample with preheating is 42% slower than the same RMF that was not preheated, indicating a slower heat release rate. The preliminary experiments on brazing Ti-6Al-4V coated with BAlSi-4 brazing material revealed dendritic structure branching out from the RMF surface into the brazing material. The dendrite structures most likely form because of rapid melting and solidification of the brazing material. However, this rapid melting and solidification cycle does not appear to occur uniformly across the BAlSi-4RMF interface which is linked to its low bonding strength. When the Ti-6Al-4V substrate is heated to 150 °C prior to ignition, the strength increases to 0.47 MPa when the total RMF thickness is 84 μm and 15 MPa of pressure is applied.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"1 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":"129814950","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: 0

Material Flow Visualization of Dissimilar Friction Stir Welding Process Using Nano-CT 基于纳米ct的异种搅拌摩擦焊材料流可视化研究

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6363

Xun Liu, Sheng Zhao, J. Ni

{"title":"Material Flow Visualization of Dissimilar Friction Stir Welding Process Using Nano-CT","authors":"Xun Liu, Sheng Zhao, J. Ni","doi":"10.1115/MSEC2018-6363","DOIUrl":"https://doi.org/10.1115/MSEC2018-6363","url":null,"abstract":"In this study, Friction stir welding (FSW) of aluminum alloy 6061-T6511 to TRIP 780 steel are analyzed under various process conditions. Two FSW tools with different sizes are used. To understand the underlying joining mechanisms and material flow behavior, nano-CT is applied for a 3D visualization of material distribution in the weld. With insufficient heat input, steel fragments are generally scattered in the weld zone in large pieces. This is observed in a combined condition of big tool, small tool offset and low rotating speed or a small tool with low rotating speed. Higher heat input improves the material flowability and generates a continuous strip of steel. The remaining steel fragments are much finer. When the volume fraction of steel involved in the stirring nugget is small, this steel strip can be in a flat shape near the bottom, which generally corresponds to a better joint quality and the joint would fracture in the base aluminum side. Otherwise, a hook structure is formed and reduces the joint strength. The joint would fail with a combined brittle behavior on the steel hook and a ductile behavior in the surrounding aluminum matrix.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"1 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":"128504096","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: 0

Interaction of a Sliding Wedge and a Metallic Specimen With a Near-Surface Inhomogeneity 具有近表面不均匀性的滑动楔与金属试样相互作用

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6341

Vandana A. Salilkumar, Narayan K. Sundaram

{"title":"Interaction of a Sliding Wedge and a Metallic Specimen With a Near-Surface Inhomogeneity","authors":"Vandana A. Salilkumar, Narayan K. Sundaram","doi":"10.1115/MSEC2018-6341","DOIUrl":"https://doi.org/10.1115/MSEC2018-6341","url":null,"abstract":"The problem of a hard wedge sliding against a metal substrate has been studied extensively for its importance in tribo-plasticity and deformation processing. Here we explore the effect of introducing a single, near-surface plastic inhomogeneity (termed as a pseudograin) in a metal substrate using Lagrangian finite element (FE) analysis. The pseudograin is allowed to be softer or harder than the surrounding material. The effects of sliding parameters like the size and location of the pseudograin, friction and indenter geometry are also studied. Interestingly, the introduction of the pseudograin can lead to production of surface folds / self-contacts, and acutely-inclined, near-surface, crack-like features, which cannot be reproduced by homogeneous specimens. In fact, this tribosystem is phenomenologically very rich, despite differing from classical triboplastic systems of Challen, Oxley and Torrance only by way of the inhomogeneity. Despite its simplicity, the model replicates several experimentally observed features of surface folding, and is a minimal model to obtain folding in sliding. The occurrence of surface folds and concomitant residual surface damage points to the important role played by microstructure-related inhomogeneities in determining surface quality in deformation processing operations (e.g. repeated sliding to generate UFG surfaces) and is also a potentially new mode of sliding wear.","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":"128072290","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: 0

Structural Design of Hybrid Processing Unit Chassis for Airborne Electronic Systems 机载电子系统混合处理单元底盘结构设计

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6422

D. Santoro, U. Lecci, F. Quadrini, L. Santo

引用次数: 1

Thermally Assisted Self-Piercing Riveting of Aluminum AA6061-T6 to Ultra-High Strength Steels AA6061-T6铝与超高强度钢的热辅助自穿孔铆接

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6367

Lin Deng, M. Lou, Yongbing Li, B. Carlson

{"title":"Thermally Assisted Self-Piercing Riveting of Aluminum AA6061-T6 to Ultra-High Strength Steels","authors":"Lin Deng, M. Lou, Yongbing Li, B. Carlson","doi":"10.1115/MSEC2018-6367","DOIUrl":"https://doi.org/10.1115/MSEC2018-6367","url":null,"abstract":"Self-piercing riveting has been widely used in vehicle body manufacturing to join aluminum alloys or aluminum to steel. However, it is difficult to rivet ultra-high strength steel (UHSS) because of its resistance to piercing of the rivet. In this paper, a thermally assisted self-piercing riveting (TA-SPR) process was proposed to improve riveting of the UHSS, through locally preheating the UHSS sheet using an induction coil prior to the traditional self-piercing riveting (SPR) process. An experimental system consisting of inductive heating apparatus, conventional self-piercing riveting equipment and coupon transfer mechanism was established and the steps, e.g., preheating, coupons transfer and riveting, were automatically conducted at preset schedules. Based on experiments with this system, the effects of heating current, heating time and coil heating distance on riveting of AA6061-T6 and DP980 were examined systematically by metallurgical analyses and mechanical tests. It was found that an appropriate combination of heating current and heating time, e.g., 0.5s at 600A, could produce crack-free joints having 77.8% higher undercut and 24% higher lap-shear strength, compared to results obtained using a conventional SPR process.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"100 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":"114465050","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

Influence of Heat Input on Mechanical Properties and Microstructure of Laser Welded Dissimilar Galvanized Steel-Aluminum Joints 热输入对异种镀锌钢-铝激光焊接接头力学性能和组织的影响

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6419

C. Yuce, F. Karpat, N. Yavuz

{"title":"Influence of Heat Input on Mechanical Properties and Microstructure of Laser Welded Dissimilar Galvanized Steel-Aluminum Joints","authors":"C. Yuce, F. Karpat, N. Yavuz","doi":"10.1115/MSEC2018-6419","DOIUrl":"https://doi.org/10.1115/MSEC2018-6419","url":null,"abstract":"The hybrid structures of aluminum-steel have been increasingly used for body-in-white constructions in order to reduce weight and green gas emissions. Obtaining acceptable joints between steel and aluminum required a better understanding of welding metallurgy and their effects on the resultant mechanical properties as well as the microstructure of the joints. In this research, the fiber laser welding of zero-gap galvanized steel and aluminum alloy in an overlapped configuration was carried out. The influence of heat input on the weld bead dimension, microstructural and mechanical properties of the joints was studied. A detailed study was conducted on the effects of the heat input on the penetration depth, weld width and microstructure of the laser welded dissimilar joints by means of an optical microscopy. A scanning electron microscopy with energy dispersive spectroscopy was carried out to determine the atomic percent of the elements for intermetallic compounds (IMC) occurred at the interface of the aluminum and steel. Microhardness measurement and tensile shear tests were conducted to evaluate the mechanical properties of the galvanized steel to aluminum lap joints. The experimental results showed that the penetration depth and weld width increased with the increase of heat input level. However, in order to limit IMC layer thickness and hardness at the surface of the weld seam and aluminum alloy, iron to aluminum dilution should be restricted by limiting the penetration depth. At lower heat input levels, less brittle IMC formation was formed. Consequently, with limited penetration depths at low heat input levels, up to 520 N tensile shear load achieved, with failures located in the interface of the joints.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"19 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":"114693840","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

Manufacturing of Antibacterial Additives by Nano-Coating Fragmentation 纳米涂层破碎法制备抗菌助剂

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6415

D. Bellisario, F. Quadrini, L. Santo, G. Tedde

引用次数: 3

Effects of Process Parameters on Crack Inhibition and Mechanical Interlocking in Friction Self-Piercing Riveting Aluminum Alloy and Magnesium Alloy 工艺参数对铝合金、镁合金摩擦自穿铆接裂纹抑制和机械联锁的影响

Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA Pub Date : 2018-06-18 DOI: 10.1115/MSEC2018-6452

Yunwu Ma, Guanzhong He, M. Lou, Yongbing Li, Zhong-qin Lin

{"title":"Effects of Process Parameters on Crack Inhibition and Mechanical Interlocking in Friction Self-Piercing Riveting Aluminum Alloy and Magnesium Alloy","authors":"Yunwu Ma, Guanzhong He, M. Lou, Yongbing Li, Zhong-qin Lin","doi":"10.1115/MSEC2018-6452","DOIUrl":"https://doi.org/10.1115/MSEC2018-6452","url":null,"abstract":"Friction self-piercing riveting (F-SPR) process has been proposed to join low ductility lightweight materials, and has shown advantages over fusion welding, solid state welding and traditional mechanical joining processes in joining dissimilar as well as low ductility materials. Because of the thermo-mechanical nature of F-SPR process, the formation of the joint is determined by riveting force and softening degree of the materials. However, it is still not clear that how exactly the riveting force and generated frictional heat jointly influence the mechanical interlocking formation and inhibit cracks during F-SPR process. To address these issues, in current study, F-SPR process was applied to join 2.2 mm-thick AA6061-T6 aluminum alloy to 2.0 mm-thick AZ31B magnesium alloy. The correlation of riveting force, torque responses as well as energy input with joint quality were investigated systematically under a wide range of process parameter combinations. It was found that a relatively greater final peak force and higher energy input were favorable to produce sound joints. Based on that, a two-stage method was proposed to better control the energy input and riveting force. It was found that the joints produced by the two-stage method exhibited significantly improved lap-shear strength, i.e., 70% higher than traditional SPR joints and 30% higher than one-stage F-SPR joints. This research provides a valuable reference for further understanding the F-SPR joint formation and process optimization.","PeriodicalId":290562,"journal":{"name":"Volume 2: Materials; Joint MSEC-NAMRC-Manufacturing USA","volume":"14 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":"128153084","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: 0