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# Practical Modelling of Joints & Connections

 Duration: 1.5 days Delivery: E-learningOnsite Classroom Language: English Level: Mid-level Availability: Worldwide Tutor(s): Tony Abbey
The course you need for learning about joints and connectors.

Most structures involve some form of jointing or connection. Traditional fabricated structures have used many thousands of bolts and rivets to connect components together in a continuous manner, in the case of ships and aircraft the total can run into millions.

Even today many structures rely on this type of technology – for example, the use of spot welds in a modern road vehicle. Significant discrete load paths are formed by lugs and pins, clips or similar connectors in many structures across a wide range of industries. Alternative forms of connection are welds joints and bonded joints. These may well exist as the sole means of load transfer or be supplemented by mechanical connections such as bolts or rivets.

The engineer is faced with an often difficult decision when attempting to simulate such connections and joints within a Finite Element Analysis (FEA). In many cases, the details of each individual connection can be ignored if an overall stiffness or strength assessment is to be made and the connection is assumed reasonably continuous. However, there may be doubts about the local flexibility and load paths developed with this assumption. It may be that the assessment of the local behavior of the connector is essential to the safety case. This would certainly be the case with main attachment fittings for example. In some cases, the interaction between the connectors and the surrounding structure is critical, as in the case of pre-loaded bolts and inter-rivet buckling.

Modeling of weld features to get a reasonable estimate of stress concentrations at the weld toe can be problematic; do we model with a fine detailed 3D model, or use a ‘hot spot’ type of approach?

The objective of this course is to review the various connection and joint technologies in use, give an overview of the physics involved and show how to successfully implement practical solutions using Finite Element Analysis.

### Bolts and Rivets

#### Overview

• Review of practical designs and applications

#### Finite Element Modeling Methods

• Bolt and Rivet Groups
• Rigid and flexible spider elements used in bolt and rivet loading distribution
• Single bolts/rivets
• Overall Stiffness and load path assumptions
• Influence of clamped structure
• Different approaches between rivets and bolts
• Line element representation with spider
• Shell element representation with spider
• Solid element representation with spider (nugget or bolt section)
• Inter-rivet buckling and other instabilities
• Internal forces directly applied
• ‘freezing’ of elements to induce pre-strain
• Usage with linear and nonlinear contact surfaces
• Overview of application and methodology
• Types of Linear Contact
• Nonlinear Contact Issues
• Interference Fit
• Detailed modeling of bolts and rivets in linear and nonlinear analysis
• Full 3D simulation
• Axisymmetric Idealization
• Nonlinear Effects
• Frictional effects
• Fatigue and Fracture Mechanics of bolts and rivets

### Lugs

#### Overview

• Review of practical designs and applications
• Traditional lug failure modes and calculations
• Bearing Distribution assumptions

#### FE Modeling Methods

• 2D Shell modeling
• 3D Solid modeling
• Linear and Nonlinear Contact methods
• Interference fits
• Fatigue and Fracture Mechanics

### Welds

#### Overview

• Review of practical designs and applications
• Traditional welding classifications and calculations

#### FE Modeling Methods

• Weld simulation with 2D shell models
• Weld simulation with 3D solid models
• Weld Toe stress concentrations
• Hot Spot methods

### Bonded Joints

#### Overview

• Review of practical designs and applications

#### FE Modeling Methods

• 2D thin shell models
• 2D plane strain methods
• 3D solid models
• Cohesive Zone Failure Modeling
• VCCT Failure Modeling

### Who Should Attend?

Engineers and designers of all levels who need to know more about modelling with joints and connections using FEA.

### Interested?

Get in touch to discuss your next steps with our experienced training team. We can work closely with you to understand your specific requirements, cater for your specific industry sector or analysis type, and produce a truly personalised training solution for your organisation.

All NAFEMS training courses are entirely code independent, meaning they are suitable for users of any software package.

Courses are available to both members and non-members of NAFEMS, although member organisations will enjoy a significant discount on all fees.

NAFEMS course tutors enjoy a world-class reputation in the engineering analysis community, and with decades of experience between them, will deliver tangible benefits to you, your analysis team, and your wider organisation.

### PSE Competencies addressed by this training course

 ID Competence Statement BMPSev2 Select suitable idealisations for welded, bonded, riveted and bolted joints in fabricated plate/shell structures.

### Interested in this Course?

Please complete this form if you are interested in scheduling an on-site training session, or if you would like to be notified of the next public course session.