ATI's Design and Analysis of Bolted Joints for Aerospace Engineers (DABJ) course

Summary: Just about everyone involved in developing hardware for space missions (or any other purpose, for that matter) has been affected by problems with mechanical joints. Common problems include structural failure, fatigue, unwanted and unpredicted loss of stiffness, joint shifting or loss of alignment, fastener loosening, material mismatch, incompatibility with the space environment, misdrilled holes, time-consuming and costly assembly, and inability to disassemble when needed. The objectives of this course are to: Build an understanding of how bolted joints behave and how they fail Impart effective processes, methods, and standards for design and analysis, drawing on a mix of theory, empirical data, and practical experience Share guidelines, rules of thumb, and valuable references The course includes many examples and class problems; calculators are required. Instructor: Tom Sarafin as worked full time in the space industry since 1979, at Martin Marietta and Instar Engineering. Since founding Instar in 1993, he has consulted for DigitalGlobe, AeroAstro, AFRL, and Design_Net Engineering. He has helped the U. S. Air Force Academy design, develop, and test a series of small satellites and has been an advisor to DARPA. He is the editor and principal author of Spacecraft Structures and Mechanisms: From Concept to Launch and is a contributing author to all three editions of Space Mission Analysis and Design. Since 1995, he has taught over 150 short courses to more than 3000 engineers and managers in the space industry. Contact this instructor (please mention course name in the subject line) Who Should Attend: The target audience for this course includes mechanical design engineers, structural analysts, manufacturing engineers, and others interested structural design for space applications. Course Outline: Overview of Designing Fastened Joints Common problems with structural joints A process for designing a structural joint Identifying functional requirements Selecting the method of attachment Strength analysis for sizing and assessment Establishing design standards and criteria Introduction to Threaded Fasteners Brief history of screw threads Terminology and specification Tensile-stress area Are fine threads better than coarse threads? Developing a Concept for the Joint Selecting the type of fastener Configuring the joint Designing a stiff joint Shear clips and tension clips Guidelines for using tapped holes and inserts Calculating Fastener Loads How a preloaded joint carries load Temporarily ignoring preload Other common assumptions and their limitations An effective process for calculating bolt loads in a compact joint Examples: tension, shear, moment Calculating fastener loads for skins and panels Failure Modes, Assessment Methods, and Design Guidelines Typical strength criteria for space-mission structures An effective process for strength analysis Bolt tension, shear, and interaction Tension joints Shear joints Identifying potential failure modes Riveted joints Fastening composite materials Thread Shear and Pull-out Strength How threads fail Computing theoretical shear engagement areas Including a knock-down factor Results of testing #10 screws installed in tapped holes and inserts Selecting Hardware and Detailing the Design Considerations in selecting hardware Selecting compatible materials Guidelines for simplifying assembly Establishing bolt preload Locking features Recommendations for controlling preload Detailed Analysis: Accounting for Bolt Preload Mechanics of a preloaded bolt Designing to reduce the load carried by the bolt Estimating the load carried by the bolt Effects of ductility Can we count on such ductility? Calculating maximum and minimum preload Thermal effects on preload Fatigue analysis for a preloaded bolt Recommended Design Practice for Ductile Bolts Not Subject to NASA Standards Applicability General recommendations Torque coefficients for steel fastners Establishing allowable limit bolt loads for design Example Complying with NASA Standards Factors of safety Fracture control for fastened joints Satisfying the intent of NSTS 08307A Simplifying: Deriving reduced allowable bolt loads Example Tuition: Tuition for this three-day course is $1,490 per person at one of our scheduled public courses. Onsite pricing is available. Companies enrolling five or more attendees qualify for a reduced rate of $1,190. Please call us at 410-956-8805 or send an email to ati@ATIcourses.com. Register Now Without Obligation