On the Effect of Latent Heat on the Fracture Toughness of Pseudoelastic Shape Memory Alloys

Baxevanis, Theocharis; Landis, Chad M.; Lagoudas, Dimitris C.

doi:10.1115/1.4028191

Cited by 16 publications

(5 citation statements)

References 27 publications

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“…Given that the energy dissipation during a loading-unloading process is lowest under the extreme case of adiabatic conditions [28], it is expected that the actual transformation toughening in real applications of SMA components would be higher than the predicted value for the adiabatic case. For the NiTi material system investigated in [13], the toughening loss due to thermomechanical coupling for mode I fracture was less than 20% in the temperature range of interest.…”

Section: Introductionmentioning

confidence: 95%

“…For differential elements farther afield the value of dK I may differ significantly from the above expression. From (13) and (14) it can be concluded that there is fan ahead of the crack tip, such that any transformed material which falls within this fan and at sufficiently small distances from the crack tip increases the near-tip intensity and consequently the energy release rate, while transformed material behind this fan reduces that intensity. For pure dilatational transformation, the fan is of 120 • .…”

Section: An Insight Into the Stress Redistribution Caused From Large mentioning

confidence: 99%

“…Currently, only the fracture response of SMAs during mechanical loading at constant ambient temperatures has received attention in the literature [4][5][6][7][8][9][10][11][12][13][14]. These studies have been driven by the desire to understand the effect of stress-induced phase transformation or detwinning on the fracture properties of SMAs, stemming mainly from their suitability for medical applications.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the driving force for crack growth during thermal actuation of shape memory alloys

Baxevanis

Parrinello

Lagoudas

2016

Journal of the Mechanics and Physics of Solids

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The effect of thermomechanically-induced phase transformation on the driving force for crack growth in polycrystalline shape memory alloys is analyzed in an infinite center-cracked plate subjected to a thermal actuation cycle under mechanical load in plain strain. Finite element calculations are carried out to determine the mechanical fields near the static crack and the crack-tip energy release rate using the virtual crack closure technique. A substantial increase of the energy release rate-an order of magnitude for some material systems-is observed during the thermal cycle due to the stress redistribution induced by large scale phase transformation. Thus, phase transformation occurring due to thermal variations under mechanical load may result in crack growth if the crack-tip energy release rate reaches a material specific critical value.

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Section: Introductionmentioning

confidence: 95%

Section: An Insight Into the Stress Redistribution Caused From Large mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the driving force for crack growth during thermal actuation of shape memory alloys

Baxevanis

Parrinello

Lagoudas

2016

Journal of the Mechanics and Physics of Solids

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“…For steady state, the I-integral is always path-independent and for ferroelastic and ferroelectric materials can be used to determine the ratio of the crack tip energy release rate to the far-field applied energy release rate. This procedure has been used by Landis [18] for ferroelastic materials, Wang and Landis [38,39] for ferroelectric materials, and Baxevanis et al [40,41] for pseudoelastic materials. For the material properties listed in Table 1 with plastic deformation turned off, the computed ratio of the far-field steady-state energy release rate to the crack tip energy release is,…”

Section: Steadily Propagating Cracksmentioning

confidence: 99%

A Constitutive Model for Isothermal Pseudoelasticity Coupled with Plasticity

Jiang

Landis

2016

Shap. Mem. Superelasticity

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In this paper, a new constitutive model for isothermal pseudoelastic shape memory alloys is presented. The model is based upon a kinematic hardening framework that was previously developed for ferroelastic and ferroelectric switching behavior. The basis of the model includes a transformation surface, an associated flow rule for transformation strain, and kinematic hardening with the back stresses represented by a transformation potential that is dependent upon the transformation strain. In contrast to many models that introduce tension/compression asymmetry by devising transformation surfaces in terms of invariants of the stress tensor, this model achieves this capability by means of expressing the transformation potential from which the back stresses are derived as a weighted mix of two potentials that are, respectively, calibrated to measured tensile and compressive responses. Additionally, in this model, plastic deformation is allowed to occur at high stresses by employing a standard J 2 -based yield surface with isotropic hardening. Finally, to demonstrate the ability of the constitutive model to perform in highly non-proportional loading states, some finite element simulations on crack tip fields are presented.

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“…To better understand the role of crack-tip transformations on both static and fatigue cracks, ad-hoc FE (Finite Element) models for SMAs were developed [39][40][41][42][43][44][45][46][47][48] and the effects of complex thermo-mechanical coupling were analyzed [47,48]. In addition, special analytical models were developed [49][50][51][52][53] that are based on modified linear elastic or elastic plastic theories, with the aim of developing effective design methods as well as to define special fracture and fatigue control parameters for SMAs.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth in Austenitic and Martensitic NiTi: Modeling and Experiments

Sgambitterra

Magarò

Niccoli

et al. 2021

Shap. Mem. Superelasticity

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Fatigue crack growth of austenitic and martensitic NiTi shape memory alloys was analyzed, with the purpose of capturing the effects of distinct stress-induced transformation mechanics in the two crystal structures. Mode I crack growth experiments were carried out, and near-crack-tip displacements were captured by in-situ digital image correlation (DIC). A special fitting procedure, based on the William’s solution, was used to estimate the effective stress intensity factor (SIF). The SIF was also computed by linear elastic fracture mechanics (LEFM) as well as by a special analytical model that takes into account the unique thermomechanical response of SMAs. A significant difference in the crack growth rate for the two alloys was observed, and it has been attributed to dissimilar dissipative phenomena and different crack-tip stress–strain fields, as also directly observed by DIC. Finally, it was shown that the predictions of the analytical method are in good agreement with effective results obtained by DIC, whereas a very large mismatch was observed with LEFM. Therefore, the proposed analytical model can be actually used to analyze fatigue crack propagation in both martensitic and austenitic NiTi.

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On the Effect of Latent Heat on the Fracture Toughness of Pseudoelastic Shape Memory Alloys

Cited by 16 publications

References 27 publications

On the driving force for crack growth during thermal actuation of shape memory alloys

On the driving force for crack growth during thermal actuation of shape memory alloys

A Constitutive Model for Isothermal Pseudoelasticity Coupled with Plasticity

Fatigue Crack Growth in Austenitic and Martensitic NiTi: Modeling and Experiments

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