Design & Analysis of Bolted Joints Training

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The main objective of this three-day Design & Analysis of Bolted Joints Training course is to build understanding of how bolted joints behave, how they fail, and how to design them to be dependable and cost effective. Just about everyone involved in developing hardware for space missions (or any other purpose, for that matter) has been affected by problems with joints using threaded fasteners. Common problems include rupture, fatigue, detrimental yielding or joint slip, galling, inadequate preload, loss of preload, low or nonlinear stiffness, excess weight, procurement cost and lead time, incompatibility with the space environment, and time-consuming assembly.

Design & Analysis of Bolted Joints TrainingDuration: 3 days

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  • We can adapt this Design and Analysis of Bolted Joints course to your group’s background and work requirements at little to no added cost.
  • If you are familiar with some aspects of this Design and Analysis of Bolted Joints course, we can omit or shorten their discussion.
  • We can adjust the emphasis placed on the various topics or build the Design and Analysis of Bolted Joints course around the mix of technologies of interest to you (including technologies other than those included in this outline).
  • If your background is nontechnical, we can exclude the more technical topics, include the topics that may be of special interest to you (e.g., as a manager or policy-maker), and present the Design and Analysis of Bolted Joints course in manner understandable to lay audiences.
AUDIENCE/TARGET GROUP

The target audience for this Design & Analysis of Bolted Joints Training course:

  • Mechanical design engineers, structural analysts, and others interested in or involved with bolted joints.
CLASS PREREQUISITES

The knowledge and skills that a learner must have before attending this Design & Analysis of Bolted Joints Training course are:

  • N/A
Design & Analysis of Bolted Joints Training - COURSE SYLLABUS
Overview
  • Common problems with structural joints
  • A process for designing a structural joint
  • Identifying functional requirements
  • Selecting the method of attachment
  • General design guidelines
  • Introduction to NASA-STD-5020
  • Key definitions per NASA-STD-5020
  • Top-level requirements
  • Factors of safety, fitting factors, and margin of safety
  • Establishing design standards and criteria
  • The importance of preload
Introduction to Threaded Fasteners
  • Brief history of screw threads
  • Thread forms and dimensional considerations
  • Tensile-stress area
  • Are fine threads better than coarse threads?
Developing a Concept for the Joint
  • General types of joints and fasteners
  • Configuring the joint
  • Designing a stiff joint
  • Shear clips and tension clips
  • Avoiding problems with fixed fasteners
Calculating Bolt Loads when Ignoring Preload
  • 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
  • Estimating fastener loads for skins and panels
Failure Modes, Assessment Methods, and Design Guidelines
  • An effective process for strength analysis
  • Bolt tension, shear, and interaction
  • Tension joints
  • Shear joints
  • Identifying potential failure modes
  • Fastening composite materials
Design & Analysis of Bolted Joints Training – Thread Shear and Pull-out Strength
  • How threads fail
  • Computing theoretical shear engagement areas
  • Including a knock-down factor
  • Test results
Selecting Hardware and Detailing the Design
  • Selecting compatible materials
  • Selecting the nut: ensuring strength compatibility
  • Common types of threaded inserts
  • Use of washers
  • Selecting fastener length and grip
  • Recommended fastener hole sizes
  • Guidelines for simplifying assembly
  • Establishing bolt preload
  • Torque-preload relationships
  • Locking features and NASA-STD-5020
  • Recommendations for establishing and maintaining preload
Mechanics of a Preloaded Joint
  • Mechanics of a preloaded joint under applied tension
  • Estimating bolt stiffness and clamp stiffness
  • Understanding the loading-plane factor
  • Worst case for steel-aluminum combination
  • Key conclusions regarding load sharing
  • Effects of bolt ductility
  • How temperature change affects preload
Analysis Criteria in NASA-STD-5020
  • Objectives and summary
  • Calculating maximum and minimum preloads
  • Tensile loading: ultimate-strength analysis
  • Separation analysis
  • Tensile loading: yield-strength analysis
  • Shear loading: ultimate-strength analysis
  • Shear loading: joint-slip analysis
  • Revisiting the bolt fatigue and fracture requirement

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