Computational Mechanics for improved COMPosites

CMCOMP

Ragnar Larsson

Dept of industrial and material science

Division for material and computational mechanics

Chalmers university of technology Part of

related to computational material mechanics for aeronautics!

Outline

My background/interests

Professor in “computational material mechanics”, current major interests:

damage failure mechanisms (compressive kinking type failure mechanisms)

homogenization – scale bridging, e.g. atomistic – continuum bridging

process modeling of composites wet out – Theory of porous media

computational mechanics of machining – ductile fracture modeling

What I want to do?

Develop issues related working plan: modeling and simulation for improved composites

Light-weighting via improved efficiency of bolted joints between composite parts!

=> improved bolt bearing strength!

Consider enhanced matrix behavior

Embedded graphene/nanoparticles in matrix

=> Challenges we are facing!

structural modeling joint, laminar/intra-laminar damage modeling!

enhanced matrix behavior => effects on the laminate composite level!?

…..

Current actvities

Visits 2-5/10 at

• UFMG, CTNANO lab, Prof. Glaura Silva

• UNICAMP, Center for Computational Engineering & Sciences (CCES), Prof. Munir Salomao

• Mackenzie university, MackGraphe Center, Prof. E. A. de Souza.

Stay at ITA 6-14/10, Mechanical engineering, Prof. Alfredo da Faria

MULTIGRAPH

• SAAB

• Chalmers, Prof. Ragnar Larsson

• UFABC, Center for engineering, Prof. Danilo Carastan

First visit October 1-15, 2017 Ongoing project

Industrial and Materials Science

6 Divisions

204 Employees

(Faculty 55.8)

Gender Balance 28/72

271 MSEK in Turnover

120 Courses

5 MSc programmes

PRODUCTION

MATERIALS SCIENCE

NANO SCIENCE AND

NANO TECHNOLOGY

TRANSPORT

10/9/2017 Chalmers 5

Design & Human factors

Product Development

Material and Computational Mechanics

Engineering Materials

Materials and Manufacture

Production Systems

User need - Form & Function - Material - Production

Div. of Material and computational mechanics

5 areas: • Lightweight Materials and Structures • Multi-phase Materials • Process Modeling & Simulation • Railway Mechanics • Structural Mechanics

Coordinators Professor Leif Asp Professor Magnus Ekh Professor Ragnar Larsson Professor Magnus Ekh Professor Fredrik Larsson

Division head: Ragnar Larsson 25 people 12 faculty, 13 PhD students

Continuum damage modeling:

FE results for increasing misalignment N

Challenge: model kink-band type failure mechanism!

Damage growth in compressive loaded CFRP plies

Issues: • Proper repr. of

damage/anisotropy • FE mesh objectivity • Computational

robustness • …

Larsson, Gutkin, JMPS, in process 2017.

Crushing failure mechanisms induced by bolted connection

Single bolted lap-joint Damage mechanisms in FRP laminate

Note! Crushing due to compressive action, inducing intra-laminar shear, delamination!

=> RQ on UD ply with fiber orientation Model compressive failure! • Computational intra-laminar ply modeling:

• Issues: “localization of deformation”, “mesh objective fracture dissipation”, “simple and robust model”!!

• Place in context with 3D modeling of stacked laminate

Bolted joints between composite parts