Fracture and damage mechanics modelling of thin-walled structures - An overview |
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Authors: | Uwe Zerbst Markus Heinimann Dirk Steglich |
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Affiliation: | a GKSS Research Centre, Institute for Materials Research, Materials Mechanics, D-21502 Geesthacht, Germany b Alcoa Technical Center, Product Design and Analysis, Alcoa Center, PA 15069-0001, USA c EADS Deutschland GmbH, Corporate Research Centre Germany, Dept. LG-MT, D-81663 Munich, Germany |
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Abstract: | This paper reviews the most important current approaches for residual strength prediction of thin-walled structures. Crack driving force parameters such the linear elastic stress intensity factor and its plastic zone corrected extension for contained yielding conditions, the crack tip opening displacement δ5, the crack tip opening angle CTOA, the cohesive zone model parameters, separation energy, critical tensile stress and critical separation and the parameters of the damage models of Gurson-Tvergaard-Needleman type are introduced and discussed with respect to their benefits and limitations for the simulation of plane and stiffened panels. In addition, specific aspects of modern non-integral and integral structures which pose a challenge are addressed. These comprise multi-site damage, crack deviation and branching, welding residual stresses, strength mismatch in material compounds and problems in bonded structures, such as delamination. A number of examples are provided to illustrate the potential of the various approaches. |
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Keywords: | Thin-walled structures Fracture mechanics Damage mechanics Residual strength Stable crack extension |
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