| |
|
S13 Integridade Estrutural |
| |
|
Title:
|
3D MODELING OF MODE I CRACK GROWTH IN STRUCTURAL MATERIALS
|
| |
|
Summary :
|
|
THIS STUDY DESCRIBES A 3-D COMPUTATIONAL FRAMEWORK TO MODEL STABLE EXTENSION OF A MACROSCOPIC CRACK UNDER MODE I CONDITIONS IN DUCTILE METALS. THE GURSON-TVERGAARD DILATANT PLASTICITY MODEL FOR VOIDED MATERIALS DESCRIBES THE DEGRADATION OF MATERIAL STRESS CAPACITY. FIXED-SIZE, COMPUTATIONAL CELL ELEMENTS DEFINED OVER A THIN LAYER AT THE CRACK PLANE PROVIDE AN EXPLICIT LENGTH SCALE FOR THE CONTINUUM DAMAGE PROCESS. OUTSIDE THIS LAYER, THE MATERIAL REMAINS UNDAMAGED BY VOID GROWTH, CONSISTENT WITH METALLURGICAL OBSERVATIONS. AN ELEMENT VANISH PROCEDURE REMOVES HIGHLY VOIDED CELLS FROM FURTHER CONSIDERATION IN THE ANALYSIS, THEREBY CREATING NEW TRACTION-FREE SURFACES WHICH EXTEND THE MACROSCOPIC CRACK. COMPUTAIONAL AND EXPERIMENTAL STUDIES ARE DESCRIBED FOR SHALLOW AND DEEP NOTCH SE(B) SPECIMENS AND FOR A CONVENTIONAL C(T) SPECIMEN. THE COMPUTATIONAL MODELS PROVE CAPABLE OF PREDICTING THE MEASURED R-CURVES AND POST-TEST MEASURED CRACK PROFILES. |
| |
|
Author :
|
Dodds, Robert 0
Ruggieri, Claudio 0
|
| |
|
Paper View :
|
|
