Fastening and Joining Research Institute (FAJRI)

FAJRI research objective is to advance the science and technology, develop, 并传播材料连接的新知识，用于可能由类似和/或混合材料制成的承重结构和机械连接系统.  这包括金属, composites, polymers, and plastics that are joined by mechanical fastening, adhesive bonding, welding, riveting, 混合或其他高级连接方法.

FAJRI研究理念
在其材料连接方面的研究, FAJRI采用系统方法，同时调查单变量和多变量相互作用的相对重要性, which would affect the overall system performance and reliability.  Those variables are divided into six groups that belong to:  1) the joint,    2)连接元件,   3) the joining tool,   4)过程控制方法,   5) in-service loads, 6)环境影响.

FAJRI研究方法论
A combination of analytical and mathematical modeling, 数值与计算机模拟, experimental testing and validation methods are used.

FAJRI设施和测试设备
FAJRI dedicated lab space and graduate student office occupy a 4,000 sq. 在韦德体育app官网主校区道奇大厅二楼的一间安全套房. FAJRI专用设备包括MTS高温室疲劳测试系统和抓地力额定(100kN), 带控制的5轴直流螺母流道, 容克机用于振动松动, two Torque-tension-angle research systems (up to 1,000 ft-lb), Wyko optical profiler for surface roughness measurement, 动态机械分析仪(DMA), 带控制装置的环境室, 循环盐雾腐蚀室, Autoclave with Process Controls for film adhesive bonding, 隔震表, 无损检测设备(超声波和光学), 有限元分析软件和计算机工作站, secure storage space and conference room facility for ITAR projects, ...etc. Several specialty labs in various engineering and science departments also support FAJRI research; this includes the Optics and NDE lab, Chemistry labs, 并拥有设备齐全的加工中心，可进行测试夹具设计和样品制造.

NSF Initiative for Composite Joining Research at OU

http://www.nsf.gov/awardsearch/showAward?AWD_ID=1822028

Dr. Nassar and his interdisciplinary research team at Oakland, in partnership with their counter parts at Georgia Institute of Technology (GT), and The University of Tennessee-Knoxville (UTK)], 最近分别获得了NSF规划拨款，以制定第一阶段的完整提案($4.5 million) of an IUCRC (Industry-University Cooperative Research Center).  The three-phase ($13.NSF计划将为俄勒冈州立大学的数字复合材料连接和修复(D-CJAR)新研究中心建立三个密切协调的站点, GT, and UTK.  一个由30名教师专家组成的研究团队, 来自三所合作大学, would lead the research at the three respective D-CJAR sites, 与相关行业和其他政府研究机构密切合作. NSF将于2019年第一季度在乔治亚理工学院举行由各自学术和工业合作伙伴主持的规划会议，由3所合作大学规划NSF第一阶段的提案. NSF要求在三个D-CJAR站点各成立一个工业咨询委员会(IAB)来选择和资助研究项目. The OU site of D-CJAR would have an automotive/ground vehicle thrust, while the GT and UTK sites would respectively have Aerospace, 能源/基础设施建设. Subsequent to review, and hopeful award, by NSF, the start date for the 3 D-CJAR sites would be during the last quarter of 2019.

FAJRI的研究成果有利于美国经济的民用和国防部门, by disseminating new fastening and joining technology to the automotive, ground vehicle, aerospace, infrastructure, 美国经济的能源部门. 这是通过技术转让和劳动力培训来实现的，最终会提高车辆和零部件的性能, 减轻重量，节约能源, 提高了产品的安全性和可靠性, 减少排放.

FAJRI has been primarily funded by the US Congress, US Army CCDC Ground Vehicle Systems Center (formerly TARDEC), 美国国家科学基金, 以及美国汽车原始设备制造商.

Sample Funded Research Projects and Topics: 

• 轻量化材料的粘接
• Process optimization of autoclave film adhesive bonding
• 损伤建模与仿真
• Adhesive bonding and mechanical fastening of composite and polymeric joints
• Phenomenon modeling of vibration-induced loosening of threaded fasteners
• Ultrasonic control of bolt elongation during bolted joints assembly
• 螺纹紧固件摩擦学
• Clamp load loss due to cyclic service loads
• Non-destructive testing and inspection of composite and metallic joints
• Elastic interaction between fasteners in gasketed bolted joints
• 脊柱螺钉关节建模
• Finite element modeling and analysis of composite, polymer and metallic joints
• 螺栓组合件的可靠性
• 扭矩规格 

Headed by the PI and Founding Director (Professor Sayed Nassar), FAJRI拥有一支强大的跨学科专家团队，指导博士研究生的研究.D.确保并执行外部资助的行业研究项目. In addition to using state of the art research equipment at FAJRI, 每个学院的研究人员都有他/她的专业实验室，专门研究特定的专业领域.  FAJRI faculty come from the Departments of 机械工程, 电气与计算机工程, Computer Science, Chemistry, 数学与统计学, 在韦德体育app官网

• 复合材料紧固和连接-博士. S. Nassar
• 数据分析，机器学习- K. Malik, Ph.D.
• 人机交互，自动化-博士. W-Y. G. Louie
• 紧固件和螺栓连接。博士. S. Nassar
• 挥发性有机化合物与化学-博士. R. Dembinski
• 无损检测/无损检测(光学和超声波)-博士. L. Yang, Dr. S. Nassar
• 螺纹紧固件摩擦学博士. S. Nassar
• 有限元模拟，力学测试-博士. Z. Wu
• Analytical, numerical and experimental stress analysis - Dr. S. Nassar
• 应用数学与统计-博士. M. Shillor
• Other collaborating faculty from other US and European institutions

A partial list of recent journal publications by FAJRI team includes: 

• Jagatap, S., Nassar, S., Abbas, R., Belingardi, G.，“工艺变量对热压灭菌膜粘合接头强度的影响”，2019， 粘附科学与技术杂志”, JAST-2018-00304.
• Jagatap, S., Nassar, S.A., Tardito, M., 热压釜固化压力和温度对聚氨酯薄膜胶粘剂聚碳酸酯单搭接接头的影响, 2018, 粘附科学与技术杂志, in press.
• Mazhari, E., Nassar, S.A., 粘接单搭接接头的剥离-剪切-扩散耦合模型, 2017, Journal of Manufacturing Science and Engineering-ASME Transactions, in press (accepted).
• Nassar, S.A., Mazhari, E., “A Coupled Shear Stress-Diffusion Model for Adhesively Bonded Single Lap Joints”, 2016, Journal of Applied Mechanics- ASME Transactions, vol. 83(10), pp. 101006-1~7.
• Zaki, A.M., Nassar, S.A., Shillor, M., “Inverse Problem Solution for Bolt Preload Using Measured Surface Deformation”, 2016, Journal of Pressure Vessels Technology - ASME Transactions, accepted (in press).
• Sakai, K, Nassar, S. A., 高相对湿度下复合材料轻量化多材料节点循环热破坏分析, 2016, Journal of Manufacturing Science and Engineering-ASME Transactions, vol. 139 (4), pp. 041007-1~11.
• Nassar, S. A., Mao, J., Yang, X., and Templeton D., “A Damage Model for Adhesively Bonded Single-Lap Thick Composite Joints”, 2012, Journal of Engineering Materials and Technology-ASME Transactions, vol. 134, no. 4, pp. 041004-1~7
• Yang, X., Nassar, S.A., and Wu, Z., 《韦德体育app官网》, 2011, Journal of Vibrations and Acoustics-ASME Transactions, vol. 133, no. 4, pp. 041013-1~11.
• Nassar, S.A., Yang, X., 预紧螺纹紧固件振动诱发松动的数学模型, 2009, Journal of Vibrations and Acoustics- ASME Transactions, vol.131, no. 2, 021009-1~13.
• Nassar, S.A., and Virupaksha, V., 基于连续介质混合模型的黏合剂厚度和性能对黏合剂接头双轴界面剪应力的影响, 2009, Journal of Engineering Materials and Technology-ASME Transactions, vol.131, no. 2, pp. 021015-1~9.
• Nassar, S. A., Tardito, M., Belingardi, G., 热压灭菌器加热和冷却速度对轻量材料粘接接头的影响, 2017, ASME-IMECE2017会议录.
• Nassar, S.A., Jagatap, S., Tardito, M., 固化温度和压力对热压罐粘合聚碳酸酯单搭接接头的影响, 2016, Symposium on Material Fastening and Joining Technology, Proceedings of the ASME International 机械工程 Congress & Exposition (IMECE2016), November 11-17, Phoenix, AZ.
• Wu, Z., Diab, M., Nassar, S.A., 高温对轻量化材料单搭接胶接的影响, 2015, American Society for Composites 30th Technical Conference, September 28-30, East Lansing, MI.
• Nassar, S.A., Mazhari, E., “Cyclic Corrosion of Composite-Based Lightweight Material Single Lap Joints”, 2015, American Society for Composites 30th Technical Conference, September 28-30, East Lansing, MI.
• Housari, B. A., and Nassar, S.A., 螺纹和轴承摩擦系数对循环横向荷载下螺纹紧固件振动诱发松动的影响, 2007, ASME Journal of Vibrations and Acoustics-ASME Transactions, Vol. 129, pp. 484-494.
• Nassar, S.A. and Housari, B. A., 孔间隙和螺纹配合对循环横向载荷作用下螺纹紧固件自松动影响的研究, 2007, ASME机械设计杂志, Vol. 129, Issue 6, pp. 586-594.
• Nassar, Sayed A. and Alkelani, A.A., “Elastic Interaction and Creep Relaxation in Bolted Gasketed Joints”, 2006, ASME Journal of Pressure Vessels Technology, Vol. 128, pp. 394-401.
• Nassar, S.A. and Matin, P., “Clamp Load Loss Due to Fastener Elongation Beyond its Elastic Limit”, 2006, ASME Journal of Pressure Vessels Technology, Vol. 128, Nov. 2006, pp. 379-387.
• Nassar, Sayed A. 和Veeram, Aditya B., “Ultrasonic Control of Fastener Tightening using Variable Wave Speed”, 2006, ASME Journal of Pressure Vessels Technology, Vol. 128, pp. 427-432.
• Nassar, Sayed A. and Housari, B. A., 螺纹节距对循环横向载荷作用下螺纹紧固件自松的影响, 2006, ASME Journal of Pressure Vessels Technology, Vol. 128, pp. 590-598.
• Nassar, S.A. and Matin, P. H., and G. C. Barber, 螺栓连接中的螺纹摩擦, 2005, Journal of Pressure Vessels Technology- ASME Transactions, Vol. 127, pp. 387-393.
• Nassar, S.A., El-Khiamy, H., Barber, G.C., Zou, Q., Sun, T.S.，“轴承与螺纹摩擦在紧固件中的应用”，2005，美国机械工程学会学报，卷. 127, pp. 263-272.
• Nassar, S.A., Barber, G.C., and Zuo, D.，“螺栓连接的轴承摩擦力矩”，2005，摩擦学学报，卷. 48, pp. 69-75.
• Nassar, Sayed A., and Matin, P. H., “Non-Linear Strain Hardening Model for Predicting Clamp Load Loss in Bolted Joints”, 2006, ASME机械设计杂志, Vol.128, Issue 6, pp.1328-1336.
• Nassar, S.A., Andrews, K.T., Kurk, S., and Shillor, M., 键合棒的建模与仿真, 2005, Journal for Mathematical and Computer Modeling, Vol. 42, pp. 553-572.
• Yang, X. and Nassar, S. A., 63Sn-37Pb钎料合金随时间循环应变的本构建模, 2005, 材料力学学报, vol. 37, pp. 801-814.
• Zou, Q., Sun, T.S., Nassar, S., Barber, G.C., El-Khiamy, H., “Contact Mechanics Approach to Determine Effective Radius in Bolted Joints”, 2005, 摩擦学学报- asme学报, Vol. 127, pp. 30-36.
• Nassar, S.A. and Virupaksha, V.L., Ganeshmurthy, S., 螺栓拧紧和接头材料对复合接头强度和性能的影响, 2007, ASME Journal of Pressure Vessels Technology, Vol. 129, pp. 43-51.
• Nassar, S. A. and Matin, P.H., 由于完全反向循环载荷作用于最初屈服的关节系统而导致的累积夹紧载荷损失, 2006, ASME机械设计杂志, Vol. 129, pp. 421-433.
• Alkelani, A.A., Housari, B., Nassar, S.A., “A Proposed Model for Evaluating Gasket Creep Relaxation in Bolted Flanges”, 2007, in press, Journal of Pressure Vessels Technology-ASME Transactions.
• Nassar, S.A. and Meng, A., 利用三维电子散斑干涉法(ESPI)对螺栓拧紧进行光学监测, 2007, ASME Journal of Pressure Vessels Technology, Vol. 129, pp. 89-95.