A computationally efficient methodology to simulate hybrid bolted joints including thermal effects

Abstract

Carbon-aluminum bolted assemblies are difficult to simulate because of the complex phenomenology involved (contact, friction, preload and thermal expansion). Therefore, accurate but computationally feasible methodologies are necessary. We propose two simplified methodologies, one based on continuum shell elements and the other on conventional shells, and compare them with a full 3D solids model. The two cases explored are a single-lap shear coupon with one bolt, and a hybrid wingbox subcomponent with 46 bolts. The effect of temperature jumps on the bolt preloads are explored. Results show that the continuum shell model presents the best tradeoff between accuracy and computational cost.

Keywords:

• Hybrid structures
• bolted joints
• computational modeling
• thermal loading
• aircraft structure
• composite laminates
• finite element method

Data availability

The raw/processed data required to reproduce these findings cannot be shared at this time due to legal or ethical reasons.

Additional information

Funding

This work was carried out under the framework of the H2020 Clean Sky 2 Project INNOHYBOX - Innovative solutions for metallic ribs or fittings introduced in a composite box to optimally deal with thermo-mechanical effects - (Call H2020-CS2-CFP06-2017-01, reference 785433) which provided the financial support. The first author also acknowledges the Grant BES-2016-078270 from the ‘Subprograma Estatal de Formación del MICINN’ co-financed by the European Social Fund.