Publication detail

Finite element analysis on the effect of martensitic transformation and plastic deformation on the stress concentration factor in a thin notched superelastic NiTi ribbon

SHAYANFARD, P. ŠITTNER, P. HELLER, L. ŠANDERA, P.

English title

Finite element analysis on the effect of martensitic transformation and plastic deformation on the stress concentration factor in a thin notched superelastic NiTi ribbon

Type

journal article in Web of Science

Language

en

Original abstract

The severe nonlinear behavior caused by the martensitic transformation (MT) and subsequent plastic deformation (PD) of det-winned martensite leads to a complex local stress redistribution at the location of stress risers of superelastic shape memory alloy (SMA) components. Nevertheless, in the literature, the simple linear elastic fracture mechanics (LEFM) equations are widely used in the evaluation of the fracture response of superelastic components which has resulted in obvious conflicts between the conclusions regarding the effect of MT on the fracture parameters, i.e. stress intensity factor (SIF) and material toughness. Furthermore, the linear elasticity method is frequently used in the literature to calculate the stress intensity range (Delta K) when the fatigue crack growth rate dependence on Delta K (da/dN – Delta K) is being evaluated. Moreover, the PD followed by MT is poorly considered in the fracture mechanics of SMAs. This paper presents a numerical investigation on the role of both MT and PD, as well as the notch acuity, on the evolution of notch-tip stresses and strains and stress concentration factor (K-tn) upon the incremental application of the macroscopic tensile load on a thin NiTi notched superelastic ribbon, to mimic the effects of MT and PD on the SIF of superelastic parts. It is revealed that MT results in drastic deviations of the notch-tip stress, as well as the stress concentration factor (K-tn), from that obtained in LEFM. Due to the heterogeneous evolution of MT, the trend of the deviations is not regular and unique upon monotonic external loading. Accordingly, the results represent the ineffectiveness of the LEFM method in the evolution of the stress concentration factor (hence, the SIF) and toughness in monotonic loading, as well as the stress intensity range (Delta K) under fatigue loading in SMA components.

English abstract

The severe nonlinear behavior caused by the martensitic transformation (MT) and subsequent plastic deformation (PD) of det-winned martensite leads to a complex local stress redistribution at the location of stress risers of superelastic shape memory alloy (SMA) components. Nevertheless, in the literature, the simple linear elastic fracture mechanics (LEFM) equations are widely used in the evaluation of the fracture response of superelastic components which has resulted in obvious conflicts between the conclusions regarding the effect of MT on the fracture parameters, i.e. stress intensity factor (SIF) and material toughness. Furthermore, the linear elasticity method is frequently used in the literature to calculate the stress intensity range (Delta K) when the fatigue crack growth rate dependence on Delta K (da/dN – Delta K) is being evaluated. Moreover, the PD followed by MT is poorly considered in the fracture mechanics of SMAs. This paper presents a numerical investigation on the role of both MT and PD, as well as the notch acuity, on the evolution of notch-tip stresses and strains and stress concentration factor (K-tn) upon the incremental application of the macroscopic tensile load on a thin NiTi notched superelastic ribbon, to mimic the effects of MT and PD on the SIF of superelastic parts. It is revealed that MT results in drastic deviations of the notch-tip stress, as well as the stress concentration factor (K-tn), from that obtained in LEFM. Due to the heterogeneous evolution of MT, the trend of the deviations is not regular and unique upon monotonic external loading. Accordingly, the results represent the ineffectiveness of the LEFM method in the evolution of the stress concentration factor (hence, the SIF) and toughness in monotonic loading, as well as the stress intensity range (Delta K) under fatigue loading in SMA components.

Keywords in English

Stress concentration factor (K-tn); shape memory alloy; superelastic; martensitic transformation; plastic deformation; stress intensity factor (SIF); finite element; NiTi; notched ribbon

Released

01.07.2020

Publisher

WORLD SCIENTIFIC PUBL CO PTE LTD

Location

SINGAPORE

ISSN

1793-6047

Volume

13

Number

5

Pages from–to

2051028–2051028

Pages count

8

BIBTEX


@article{BUT164618,
  author="Pejman {Shayanfard} and Petr {Šittner} and Luděk {Heller} and Pavel {Šandera},
  title="Finite element analysis on the effect of martensitic transformation and plastic deformation on the stress concentration factor in a thin notched superelastic NiTi ribbon",
  year="2020",
  volume="13",
  number="5",
  month="July",
  pages="2051028--2051028",
  publisher="WORLD SCIENTIFIC PUBL CO PTE LTD",
  address="SINGAPORE",
  issn="1793-6047"
}