continuum damage models for composite materialsstpinho/research/workshops/1st... ·  ·...

1

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 1

Analisys and Advanced Materials for Structural DesignAnàlisis i Materials Avançats pel Disseny Estructur al

Continuum damage models forcomposite materials

From material to structural design

Pere Maimí

University of Girona

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 2

Strategy of Composite Structural design

INDUSTRY STRATEGY : BUILDING BLOCK APPROACHINDUSTRY STRATEGY : BUILDING BLOCK APPROACH

NUMERICAL TOOLS NEED FURTHER IMPROVEMENTS TO REDUCE COST OF LABOTATORY TESTING IN MATERIAL AND STRUCTURAL DE SIGN

Conceptual design

LaboratoryTesting

Virtual Mechanical

Testing

ExperienceDatabase

Final design

2

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 3

• Models can be implemented in a commercialfinite element codes, allowing to solve structureswith complex geometries.

• Thermodynamics of irreversible processes offersa rigorous framework.

• Capability of treat couplet problems. Damage, plasticity, thermal dilatation …

• Models are able to detect the onset (stress criteria) and the evolution (Energy dissipation) ofinternal variables.

Why Continuum damage mechanics?

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 4

IDM

TIDM

0

090

0

Compountsproperties:

-Elastic-Strength-Fracture energy

Compositeproperties:

-Elastic-Strength-Fracture energy

Composite design strategy: building block approach in VMT

Laminateproperties:

-Elastic-Matrix cracking-Strength-Fracture energy

Structural response

-Resistence-Damage tolerance-Global ductility

3

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 5

• Damage model for isotropic materials (IDM)• Element SOLID 3D ABAQUS

• Damage model for transversely isotropicmaterials (TIDM)

• Element SOLID 3D ABAQUS

• Damage model for composite laminates(mesomodels)

• Element thin shell ABAQUS

Continuum damage models developed

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 6

Laminate properties: (TIDM), Matrix cracking, TENSION

0900

0900

0900

0900

0900

0900

4

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 7

Laminate properties: (TIDM), Matrix cracking, COMPRESSION

90º

0º

0º

DEFORMED X25

MATRIX CRACKS UNDER COMPRESSIVE

LOADS

DELAMINATIONS

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 8

Laminate properties: (TIDM), Matrix cracking, COMPRESSION

MATRIX CRACKSDELAMINATIONS

0º

90º

0ºMaximum compressive principal strain

5

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 9

Damage model for laminated structures (mesomodel)

AS4/3501-6[45/-45/02/90/02/-45/45]

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 10

Damage model for laminated structures (mesomodel)

Fiber damage onset in 0º ply

F

∝∝∝∝ displacement

6

Novembre 2005 1st DEMEGI / INEGI Workshop on Composite Materials 11

http://amade.udg.es