A note on calibration of ductile failure damage indicators

International audienceThe effect of stress state and loading path on the ductile fracture of aluminum 2024-T351 is characterized through tension–torsion experiments on tubular specimens. The experimental program includes proportional and non-proportional loading paths leading to the onset of fracture at nearly plane stress conditions at stress triaxialities between 0 and 0.6. Stereo digital image correlation is used to measure the displacements and rotations applied to the specimen shoulders. An isotropic non-quadratic Hosford plasticity model with combined Voce–Swift hardening is used to obtain estimates of the local stress and strain fields within the specimen gage section. The hybrid experimental–numerical results indicate a higher strain to fracture for pure shear than for uniaxial tension. The calibration of a Hosford–Coulomb fracture initiation model suggests that the ductility of aluminum 2024-T351 decreases monotonically as a function of the stress triaxiality, whereas it is a non-symmetric convex function of the Lode angle parameter. It is shown that a simple non-linear damage accumulation rule can describe the effect of non-proportional loading on the strain to fracture

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“…Here, this is achieved in a phenomenological manner using a damage indicator modeling framework (e.g. Fischer et al, 1995).…”

Section: Modeling Of the Effect Of Loading Pathmentioning

confidence: 99%

Ductile fracture of aluminum 2024-T351 under proportional and non-proportional multi-axial loading: Bao–Wierzbicki results revisited

Papasidero

Doquet

Mohr

2015

International Journal of Solids and Structures

204

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“…Needleman et al (1993) or LLorca (2004. On the other hand, element elimination models that are based on a ductile damage indicator (Fischer et al, 1995) or on other criteria have been used, compare e.g. Berns et al (1998).…”

Section: Treatment Of Damage Within Micromechanical Modelsmentioning

confidence: 99%

“…If information is required only on the microstructural features or the overall loads at which microscopic damage will initiate, it is often sufficient to monitor appropriate "damage relevant fields" such as the the maximum principal stress in brittle materials, a ductile damage indicator (Fischer et al, 1995) for metals, or the traction vectors at interfaces. In a similar vein, shakedown theorems may be used on the microscale to assess the vulnerability of microstructured materials to low-cycle fatigue (Bohm, 1993).…”

Section: Treatment Of Damage Within Micromechanical Modelsmentioning

confidence: 99%

A Short Introduction to Continuum Micromechanics

Böhm

2004

Mechanics of Microstructured Materials

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Basic issues in continuum mechanical modeling of microstructured materials are discussed and a number of physically based modeling approaches are presented, among them mean field and bounding methods as well as unit cell and embedding models. In addition, important aspects of multi-scale modeling strategies are addressed and a short introduction to the treatment of damage at the constituent level within micromechanical models is given.

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“…The point at which damage starts to accumulate in the material is controlled by £o (also known as the Rice-Tracey parameter in the literature) while L limits the local gradients of the damage indicator which influences the rate at which damage evolves. For the local version of the Rice-Tracey damage indicator a procedure for calibrating the parameter £o has been published (Fischer et al 1995). However, £o and L are coupled, i.e.…”

Section: Parameter Identification For the Ductile Damage Modelmentioning

confidence: 99%

Numerical simulations of void linkage in model materials using a nonlocal ductile damage approximation

et al. 2007

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Experiments on the growth and linkage of 10 urn diameter holes laser drilled in high precision patterns into Al-plates were modelled with finite elements. The simulations used geometries identical to those of the experiments and incorporated ductile damage by element removal under the control of a ductile damage indicator based on the micromechanical studies of Rice and Tracey. A regularization of the problem was achieved through an integral-type nonlocal model based on the smoothing of the rate of a damage indicator D over a characteristic length L. The

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A note on calibration of ductile failure damage indicators

Cited by 54 publications

References 36 publications

Ductile fracture of aluminum 2024-T351 under proportional and non-proportional multi-axial loading: Bao–Wierzbicki results revisited

Ductile fracture of aluminum 2024-T351 under proportional and non-proportional multi-axial loading: Bao–Wierzbicki results revisited

A Short Introduction to Continuum Micromechanics

Numerical simulations of void linkage in model materials using a nonlocal ductile damage approximation

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