scholarly journals Characteristics of a bolted joint with a shape memory alloy stud

2011 ◽  
Author(s):  
N. Ould-Brahim ◽  
A.-H. Bouzid ◽  
V. Brailovski
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Bolted Joint

scholarly journals Numerical Investigation of Preload Process of Bolted Joint with Superelastic Shape Memory Alloy

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 730
Author(s):  
Xiangjun Jiang ◽  
Yongkun Wang ◽  
Fengqun Pan ◽  
Ze Jing ◽  
Jin Huang ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Volume Fraction ◽  
Fe Modeling ◽  
Bolted Joint ◽  
Analysis Framework ◽  
Integration Algorithm ◽  
Applied Loading ◽  
Nonlinear Hysteresis ◽  
Proposed Model

A phenomenological constitutive model is developed to describe the uniaxial transformation ratcheting behaviors of the superelastic shape memory alloy (SMA) by employing a cosine–type phase transformation equation with the initial martensite evolution coefficient that can capture the feature of the predictive residual martensite accumulation evolution and the nonlinear hysteresis loop on a finite element (FE) analysis framework. The effect of the applied loading level on transformation ratcheting is considered in the proposed model. The evolutions of transformation ratcheting and transformation stresses are constructed as the function of the accumulated residual martensite volume fraction. The FE implementation of the proposed model is carried out for the numerical analysis of transformation ratcheting of the SMA bar element. The integration algorithm and the expression of consistent tangent modulus are deduced in a new form for the forward and reverse transformation. The numerical results are compared with those of existing models; experimental results show the validity of the proposed model and its FE implementation in transformation ratcheting. Finally, a FE modeling is established for a repeated preload analysis of SMA bolted joint.

Recovery of Preload in Bolted Joint Using Shape Memory Alloy Elements

2003 ◽  
Author(s):  
Mehrdaad Ghorashi ◽  
Daniel J. Inman
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Threshold Level ◽  
Design Stage ◽  
Strain Gauges ◽  
Self Healing ◽  
Bolted Joint ◽  
Cross Sectional ◽  
Bolt Preload ◽  
Joint Behavior

One of the main problems with a bolted joint is losing its preload. In this situation, it cannot provide the required clamping force needed to keep the joint members together or prevent fluid leakages. Although every effort is usually made at the design stage to prevent such failure, because of the numerous factors present in the problem, these efforts are not always successful. After loosening occurs, the joint should be retightened to regain its preload. However, there are circumstances where the joint is very important but it is not easily accessible and retightening cannot be done manually. The shape memory effect (SME) property can be used in such circumstances to produce the necessary preload. The shape memory alloy (SMA) element should be activated if monitoring the bolt preload through the application of strain gauges shows that the preload has fallen below a pre-determined threshold level. This paper presents a mathematical model for the SMA element and the whole joint behavior. The relation between SMA activation (corresponding to the amount of phase change in the SMA) and the resulting preload is estimated. To this end, it is assumed that the SMA element behaves in such a way that either its cross-sectional area or its volume remain constant. The analysis of this model shows the feasibility of the application of SMA for producing the required preload. Hence, if used properly, the required preload is achieved and a self-healing joint is obtained.

scholarly journals Finite Element Analysis for the Self-Loosening Behavior of the Bolted Joint with a Superelastic Shape Memory Alloy

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1592 ◽  
Author(s):  
Xiangjun Jiang ◽  
Jin Huang ◽  
Yongkun Wang ◽  
Baotong Li ◽  
Jingli Du ◽  
...  
Keyword(s):  
Finite Element ◽  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory ◽  
Computational Procedure ◽  
The Self ◽  
External Loading ◽  
Bolted Joint ◽  
Element Analysis ◽  
Dissipation Energy

A macroscopic constitutive model is proposed in this research to reproduce the uniaxial transition ratcheting behaviors of the superelastic shape memory alloy (SMA) undergoing cyclic loading, based on the cosine-type phase transition equation with the initial martensite evolution coefficient that provides the predictive residual martensite accumulation evolution and the nonlinear feature of hysteresis loop. The calculated results are compared with the experimental results to show the validity of the present computational procedure in transition ratcheting. Finite element implementation for the self-loosening behavior of the superelastic SMA bolt is then carried out based on the proposed constitutive model to analyze the curves of stress-strain responses on the bolt bar, clamping force reduction law, dissipation energy change law of the bolted joint for different external loading cases, and preload force of the bolt.

scholarly journals Finite Element Modeling of A phenomenological Constitutive Model for Super-elastic Shape Memory Alloy and its Application for Preload Process Analysis of Bolted Joint

2018 ◽  
Author(s):  
Xiangjun Jiang ◽  
Jin Huang ◽  
Yongkun Wang ◽  
Fengqun Pan ◽  
Baotong Li ◽  
...  
Keyword(s):  
Finite Element ◽  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory ◽  
Volume Fraction ◽  
Process Analysis ◽  
Bolted Joint ◽  
Integration Algorithm ◽  
Applied Loading ◽  
Proposed Model

A phenomenological constitutive model is developed to describe the uniaxial transformation ratcheting behaviors of super–elastic shape memory alloy (SMA) by employing a cosine–type phase transformation equation with the initial martensite evolution coefficient that can capture the feature of the predictive residual martensite accumulation evolution and the nonlinear hysteresis loop on a finite element (FE) analysis framework. The effect of the applied loading level on transformation ratcheting are considered in the proposed model. The evolutions of transformation ratcheting and transformation stresses are constructed as the function of the accumulated residual martensite volume fraction. The FE implementation of the proposed model is carried out for the numerical analysis of transformation ratcheting of the SMA bar element. The integration algorithm and the expression of consistent tangent modulus are deduced in a new form for the forward and reverse transformation. The numerical results are compared with those of existing model and the experimental results to show the validity of the proposed model and its FE implementation in transformation ratcheting. Finally, a FE modeling is established for a repeated preload analysis of SMA bolted joint

Modeling and Experimental Aspects of Self-healing Bolted Joint through Shape Memory Alloy Actuators

2011 ◽  
Vol 22 (14) ◽  
pp. 1581-1594 ◽  
Author(s):  
Cassio T. Faria ◽  
Vicente Lopes Junior ◽  
Daniel J. Inman
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Self Healing ◽  
Bolted Joint

The role of (001) microtwinning played during the deformation of stress induced martensite in Ti-Ni-Nb shape memory alloy

2003 ◽  
Vol 112 ◽  
pp. 743-746
Author(s):  
Y. F. Zheng ◽  
W. Cai ◽  
L. C. Zhao
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory

Structure and mobility of martensite variant interfaces in a Cu-Zn-AI shape memory alloy

2003 ◽  
Vol 112 ◽  
pp. 519-522 ◽  
Author(s):  
W. Cai ◽  
J. X. Zhang ◽  
Y. F. Zheng ◽  
L. C. Zhao
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Martensite Variant

Compression Experiment and Simulation Study of Shape Memory Alloy Lattice Structure

2019 ◽  
Author(s):  
Osuke Ishida ◽  
Junichi Kitada ◽  
Katsuhiko Nunoani ◽  
Kiyoshi Uzawa
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Simulation Study ◽  
Lattice Structure ◽  
Experiment And Simulation
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