Threaded Fastening Systems per NASA-STD-5020 Training

Threaded Fastening Systems per NASA-STD-5020 Training


Threaded Fastening Systems per NASA-STD-5020 Training Course Description

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 slipping or loss of alignment, fastener loosening, material mismatch, incompatibility with the space environment, mis-drilled 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
Help you understand the new NASA-STD-5020

Threaded Fastening Systems per NASA-STD-5020 TrainingRelated Courses:

Duration:3 days

Customize It:

With onsite Training, courses can be scheduled on a date that is convenient for you, and because they can be scheduled at your location, you don’t incur travel costs and students won’t be away from home. Onsite classes can also be tailored to meet your needs. You might shorten a 5-day class into a 3-day class, or combine portions of several related courses into a single course, or have the instructor vary the emphasis of topics depending on your staff’s and site’s requirements.

Course Content:

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
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
Terminology and specification
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 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
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

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: ultimate-strength analysis
Shear loading: joint-slip analysis
Revisiting the bolt fatigue and fracture requirement


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Time Frame: 0-3 Months4-12 Months

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