Temperature analysis of one-dimensional NiTi shape memory alloys under different loading rates and boundary conditions

Yang, Shengyou; Dui, Guan Suo

doi:10.1016/j.ijsolstr.2013.05.026

Cited by 24 publications

(15 citation statements)

References 39 publications

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“…The experiments were repeated at least five times for both implants. TiN coating takes longer to transform because the heat transfer coefficients of NiTi alloy and TiN coating are 20 and 11 W m –1 K –1 , respectively. The TiN layer covering the outer surface of the NiTi alloy served as a thermal barrier.…”

Section: Resultsmentioning

confidence: 99%

Determination of the Effect of TiN Coating on Self-Fitting Properties of Dental Implants Made of NiTi Alloy

Korkmaz

Sağlam

2022

ACS Biomater. Sci. Eng.

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Design and material research continues to increase dental implants’ success rates, which is a widely applied treatment type. The size and morphology of the implant–bone interface are essential for implant stability. Our study produced a dental implant with two artificial tooth roots from NiTi alloy to increase the implant–bone contact surface. The properties of NiTi alloy, such as transformation temperature and composition, were determined by material characterization tests. Using NiTi alloy’s shape memory effect, these artificial roots at body temperature were programmed with appropriate heat treatments for the self-fitting feature. Dental-implant-like models are coated with TiN to prevent Ni ion release. The corrosion tests were performed in Ringer’s solution to determine the effect of TiN coating on Ni ion release. The nickel ion emission values showed that the TiN coating inhibited the release. In addition, it was determined that the TiN coating increased the shape memory transformation time of the NiTi alloy. In in vitro tests of NiTi and TiN-coated NiTi implants, it was observed that they completed self-fitting by deforming the trabecular bone, but the placement in the cortical bone was not complete. During the use of a shape memory implant, it should complete its transformation without contacting the cortical bone and should not cause a stress concentration.

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Section: Resultsmentioning

confidence: 99%

Determination of the Effect of TiN Coating on Self-Fitting Properties of Dental Implants Made of NiTi Alloy

Korkmaz

Sağlam

2022

ACS Biomater. Sci. Eng.

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“…The Clausius–Clapeyron stress-temperature relationship for Ni-Ti describes the activation process under stress of the forward transformation from austenite to martensite, as well as the reverse transformation (martensite to austenite). This relationship indicates that the activation temperatures ( As , Af , Ms and Mf ) increase linearly per unit stress [ 37 , 38 , 39 ]. At higher temperatures, martensite is unstable, and therefore, returns to the austenite phase on unloading.…”

Section: Methodsmentioning

confidence: 99%

Advances in Selective Laser Melting of Nitinol Shape Memory Alloy Part Production

et al. 2019

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Nitinol (nickel-titanium or Ni-Ti) is the most utilized shape memory alloy due to its good superelasticity, shape memory effect, low stiffness, damping, biocompatibility, and corrosion resistance. Various material characteristics, such as sensitivity to composition and production thermal gradients, make conventional methods ineffective for the manufacture of high quality complex Nitinol components. These issues can be resolved by modern additive manufacturing (AM) methods which can produce net or near-net shape parts with highly precise and complex Nitinol structures. Compared to Laser Engineered Net Shape (LENS), Selective Laser Melting (SLM) has the benefit of more easily creating a high quality local inert atmosphere which protects chemically-reactive Nitinol powders to a higher degree. In this paper, the most recent publications related to the SLM processing of Nitinol are reviewed to identify the various influential factors involved and process-related issues. It is reported how powder quality and material composition have a significant effect on the produced microstructures and phase transformations. The effect of heat treatments after SLM fabrication on the functional and mechanical properties are noted. Optimization of several operating parameters were found to be critical in fabricating Nitinol parts of high density. The importance of processing parameters and related thermal cooling gradient which are crucial for obtaining the correct phase structure for shape memory capabilities are also presented. The paper concludes by presenting the significant findings and areas of prospective future research in relation to the SLM processing of Nitinol.

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“…The former corresponds to C j1 = 0 and the latter corresponds to C j2 = 0. Different boundary conditions lead to totally different thermo-mechanical coupling and should be carefully addressed in practice [28,29]. For simplicity, in the next numerical analysis, the latter is used with C 12 = C 22 = 0, C 11 = C 21 = 1.…”

Section: Heat Transfermentioning

confidence: 99%

Thermoelastic Analysis of a Functionally Graded Rotating Thick-Walled Tube Subjected to Mechanical and Thermal Loads

Xin

Yang

et al. 2015

Int J Thermophys

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A thermoelastic solution for the functionally graded rotating thick-walled tube subjected to axisymmetric mechanical and thermal loads is given in terms of volume fractions of constituents. We assume that the tube consists of two linear elastic constituents and the volume fraction of one phase is a power function varied in the radial direction. By using the assumption of a uniform strain field within the representative volume element, the theoretical solutions of the displacement and the stresses are presented. Based on the relation of the volume average stresses of constituents and the macroscopic stresses of the composite material in micromechanics, the present method can avoid the assumption of the distribution regularities of unknown overall material parameters appeared in existing papers, such as Young's modulus, thermal expansion coefficient, thermal conductivity, and density. The effects of the angular velocity, the volume fraction, the ratio of two thermal expansion coefficients, the ratio of two thermal conductivities, and the ratio of two densities on the displacement and stresses are systematically studied, which should help structural engineers and material scientists optimally design thick-walled tube comprised inhomogeneous materials.

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Temperature analysis of one-dimensional NiTi shape memory alloys under different loading rates and boundary conditions

Cited by 24 publications

References 39 publications

Determination of the Effect of TiN Coating on Self-Fitting Properties of Dental Implants Made of NiTi Alloy

Determination of the Effect of TiN Coating on Self-Fitting Properties of Dental Implants Made of NiTi Alloy

Advances in Selective Laser Melting of Nitinol Shape Memory Alloy Part Production

Thermoelastic Analysis of a Functionally Graded Rotating Thick-Walled Tube Subjected to Mechanical and Thermal Loads

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