US-Egypt Cooperative Research: Effects of Machining Parameters on the Strength and Fatigue Behavior of Bolted Joints in GFRP Composites

美埃合作研究：加工参数对 GFRP 复合材料螺栓接头强度和疲劳行为的影响

• 批准号: 0354336
• 负责人: Mohamed Seif
• 金额: $ 2.9万
• 依托单位: Alabama A&M University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-05-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0354336&HistoricalAwards=false
• 关键词: US; Egypt; Cooperative; Research; Effects

0210475SeifDescription: This award is for support of a joint research project by Dr. Mohamed A. Seif, Department of Mechanical Engineering, Northern Illinois University (NIU), Dekalb, Illinois, and Dr. Usama Khashaba, Department of Mechanical Design and Production Engineering, and Dr. Gamal Nawara, Research and Graduate Studies, both at Zagazig University, Zagazig, Egypt. With the wide use of composite materials in structural components, it has become necessary to drill holes into laminates to facilitate bolting or riveting to the main load-bearing structures. Stress concentration, delamination and microcracking are the main problems associated with drilled holes, which significantly reduce the composites' performance. The PIs will investigate the effect of the drilling parameters on the mechanical properties of composites. This includes the effect of different cutting conditions (feeds and speeds), machining operations (CNC, laser, and water jet), and the size and shape of the drills. The influence of the quality of the hole on the notched strength, pin bearing strength and bolted joint strength under uniaxial static and fatigue loading conditions will also be examined. Special interest will also be given to study the joint performance under various assembly conditions such as the bolt tightening torque, the washer size, the bolt clearance, and the diameter/width ratio. Optical microscopes, SEM, and laser measurement techniques will be used in this investigation. Scope: This project will help in establishing a better understanding of the behavior ofbolted joints in composite materials. In addition, the development of engineering models will contribute to improve basic studies of composite materials under various operationalconditions. The collaboration involves an established and experienced U.S. scientist in the field and two researchers in a relatively small university in Egypt as well as a number of industrial organizations in that country.

0210475 Seif描述：该奖项是为了支持穆罕默德·A. Seif，机械工程系，北方伊利诺伊大学（NIU），Dekalb，伊利诺伊州，和博士Usama Khashaba，机械设计和生产工程系，和博士Gamal Nawara，研究和研究生，都在Zagazig大学，Zagazig，埃及。 随着复合材料在结构部件中的广泛使用，有必要在层压板中钻孔以便于螺栓连接或铆接到主要承载结构。 孔加工过程中产生的应力集中、分层和微裂纹是影响复合材料性能的主要问题。PI将研究钻削参数对复合材料力学性能的影响。这包括不同切削条件（进给和速度）、加工操作（CNC、激光和水射流）以及钻头的尺寸和形状的影响。孔的质量对缺口强度，销轴承强度和螺栓连接强度在单轴静态和疲劳载荷条件下的影响也将被检查。还将特别关注研究各种装配条件下的接头性能，如螺栓拧紧扭矩、垫圈尺寸、螺栓间隙和直径/宽度比。光学显微镜，扫描电镜和激光测量技术将用于这项调查。范围：这个项目将有助于建立一个更好的理解的行为ofbolted接头在复合材料。此外，工程模型的发展将有助于改善各种操作条件下复合材料的基础研究。 这项合作涉及一位在该领域有经验的美国科学家和埃及一所相对较小的大学的两名研究人员，以及该国的一些工业组织。