This training is currently only available as inhouse training. Please note that inhouse trainings are not included in the CADFEM Learning Subscription.
Simulating Bonded Joints Effectively and Practically
For adhesive connections that should last
In this course, you will gain practical technology and simulation knowledge for the design of reliable adhesive bonds. This training is offered as a 2-day course.
Duration
2 days
Prerequisites
Basic knowledge of Ansys Mechanical
Software used
Ansys Mechanical
- Understanding material behavior, selecting models, fitting parameters
- Considering internal stresses and warpage in the curing process
- Learning approaches to simulation of adhesive failure
- Learning best practice tips for solution management
Description
For planning the bonding of different materials using adhesive technology, it is indispensable to be able to assess durability at an early stage. The finite element method (FEM) is a proven tool in this regard. In development, design rules of adhesive joint geometry must be observed as they have a major impact on adhesive strength. Adhesive failure due to tensile shear, shear stress, peeling and warpage of the components after the curing process can be predicted in many cases. Simulation and computation are necessary building blocks of a successful, reliable bonding process. The key focus of the training is on getting to know the decisive factors for successful computation and FEA simulation of adhesive joints. You expand the necessary knowledge in a goal oriented manner. Conversion of theoretical knowledge into effective and practice-oriented FEA models is taught and demonstrated.
This training is ideal for simulation engineers and engineers for whom adhesive joint calculation is part of everyday work. Also department managers who want to verify the effectiveness of existing simulation methods or would like to introduce adhesive bond simulation are invited. Project managers who commission simulations and would like to develop more in-depth knowledge of simulation and results interpretation.
Detailed agenda for this 2-day training
Day 1
01 Useful information about adhesive bonds
- Application areas of adhesive joints
- Overview of testing methods
- Design rules
- The impact of geometric design
- Defining adhesive strength
- Impact of adhesive layer deformation
- Impact of overlapping length and layer thickness
02 Linear elasticity calculation methods: analytical and with FEM
- Evaluating adhesive strength in accordance with the nominal stress concept
- Strength computation in accordance with Volkersen
- Linear-elastic isotropic properties of adhesives (table)
- Metal factors of common materials (table)
- Computation with FEM: results from a research project
- Workshop: Single-shear bonding
- Suitable mesh
- Defining suitable stress evaluation paths
- Average stress formation
- Appendix: Development of complex material laws for adhesives
03 Internal stresses and warpage in the curing process
- Different thermal expansion coefficients
- Chemical reaction shrinkage
- Conclusion: Comparison with FEM computation
- Considering the gel point (glass temperature)
- Outlook: Considering reaction kinetics
04 Workshop: internal stresses and warpage in a sheet metal joint
- Successive introduction of effects and their superpositions:
- Temperature behavior
- Chemical reaction shrinkage
- Considering the gel point (glass temperature)
Day 2
05 Creep behavior and relaxation of adhesive bonds
- Influencing factors on creep
- Creep ranges
- Characterization of FE creep laws
- Approaches for creep
- Creep laws in Ansys
- Definition in Workbench (Engineering Data)
- Combination options with plastic materials laws (creep + plasticity)
- Solution settings
- Workshop: Long-time relaxation (time hardening) of an axle connection under torsion
06 Viscoelastic behavior of adhesive bonds
- Characterization of the visco-elastic materials law
- Linear viscoelasticity: generalized Maxwell element
- Continuum mechanic display (Ansys) – 3D
- Literature references
- Determining materials data: Measuring arrangements
- Curve fitting Prony series (time domain) in
- Ansys Workbench
- Solution settings
- Combination options with plastic materials laws
- Workshop: Relaxation of an axle connection under varying torsion
07 Simulation of adhesive failure with cohesive zone approaches
- Characterization of the cohesive zone materials laws
- Application options
- cohesive zone approach
- Exponential vs. bilinear CZM
- Application with different element types
- Solution settings
- Results check
- Information on complexity and computation cost
- Determining the cohesive zone parameters
- Examples from CADFEM practice
08 Workshop: fracture of a double cantilever probe (DCB)
- Cohesive zone definition
- Contact settings
- Convergence criteria
- Results checks
- Determining the force-displacement diagram
Your Trainers
Ulrich Barthold
Dr.-Ing. Hendrik Donner
Placement in the CADFEM Learning Pathway
Participant data
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