Article
Materials Science, Composites
Bingfei Liu, Fangfang Zhang, Rui Zhou, Yigang Sun
Summary: This study investigates the mechanical behaviors of SMPC-SMAs under different loading conditions, considering the influence of temperature changes on phase transition and discussing the thermomechanical behaviors of these composites. The results show that SMPC-SMAs display different mechanical properties than pure SMAs or SMPs, making them a promising prospect for engineering applications.
POLYMER COMPOSITES
(2021)
Article
Engineering, Aerospace
Nguyen Van VIET, Wael ZAKI
Summary: A novel and simple exact semi-analytical model for superelastic SMA wire reinforced composites under bending loads is proposed in this study. The mechanical response of the composite is investigated using analytical equations and numerical simulations, showing that the composite exhibits superelastic behavior under certain conditions, which is beneficial for applications requiring large recoverable strains or high energy dissipation density.
CHINESE JOURNAL OF AERONAUTICS
(2021)
Article
Instruments & Instrumentation
Jian Li, Zhihong Liang, Junjie Liu, Chao Yu, Xuelian Zhang, Qianhua Kan
Summary: The cyclic shape memory effect of thermo-induced shape memory polymers can be influenced by thermo-mechanical loading histories. During deformation, polymer chains undergo the initial dissociation of sub-entanglements, slipping, and orientation. The strain can be recovered through the internal rotation of the dihedral angle during reheating. A thermo-viscoelastic model is proposed to capture the cyclic shape memory effect, considering the slipping of polymer chains and the relationship between strain and orientation. The model is verified through experimental and simulated results, showing reasonable predictions of the cyclic shape memory effect.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Duygu Dengiz, Hauke Goldbeck, Sabrina M. Curtis, Lars Bumke, Justin Jetter, Eckhard Quandt
Summary: Auxetic structures with negative Poisson’s ratio show promising potential in solving engineering problems by allowing elongation perpendicular to applied stresses. This study investigates four different auxetic microstructures using shape memory alloys, capable of surviving high strains. The mechanical behavior of these thin film structures under tension is evaluated, with two designs showing wrinkling instabilities and the other two displaying stable, non-wrinkling behavior, making them suitable for stretchable electronics, wearable medical devices, or implants.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Multidisciplinary
Aayush Prasad, Swapnil Moon, I. Joga. Rao
Summary: Shape memory polymers (SMPs) are soft active materials that can retain temporary shapes and deform in response to stimuli. This paper focuses on a subclass of thermally activated SMPs, discussing their behavior and the effects of parameters such as temperature and crystallinity on nonlinear deformation and shape memory. The study shows how these parameters influence the complex thermo-mechanical behavior of SMPs.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
W. S. Cai, T. Chen, H. Z. Lu, H. W. Ma, Z. Liu, A. Yan, C. H. Song, H. Hosoda, C. Yang
Summary: In this study, a dual-SMA composite with a biospired honeycomb structure was designed and fabricated using a combination of 3D printing and hot extrusion. The composite exhibited superior superelasticity, with a remarkable recoverable strain and good recovery rate. The honeycomb structure facilitated the occurrence of progressive phase transformation, enabling the composite to sustainably bear loads.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Review
Materials Science, Multidisciplinary
Woo-Chul Kim, Ka-Ram Lim, Won-Tae Kim, Eun-Soo Park, Do-Hyang Kim
Summary: A new concept has been introduced for an alloy with both glass forming ability and shape memory characteristics, which can enhance the physical properties of shape memory alloys by suppressing the formation of brittle intermetallic compounds and enabling the formation of nanocrystalline structure. The glass precursor is not only suitable for small-sized devices but also allows for production of intricate geometry through thermoplastic forming, with shape memory effect or superelasticity manifested after crystallization. The study reviews typical NiTi-based SMAs and multicomponent SMAs fabricated using glass precursor, discussing the effects of quaternary doping and the properties of multicomponent SMA systems.
PROGRESS IN MATERIALS SCIENCE
(2021)
Review
Materials Science, Multidisciplinary
Woo-Chul Kim, Ka-Ram Lim, Won-Tae Kim, Eun-Soo Park, Do-Hyang Kim
Summary: This paper introduces a new alloy concept based on NiTi alloys, with both glass forming ability and shape memory characteristics. By suppressing the formation of brittle intermetallic compounds, the physical properties of shape memory alloys fabricated using glass precursor can be maximized. The structure and properties of multicomponent SMA systems are also discussed.
PROGRESS IN MATERIALS SCIENCE
(2022)
Article
Materials Science, Composites
Fei Zhao, Yuqi Chen, Bo Zhou, Yingjie Li, Shifeng Xue
Summary: A new constitutive model for simulating the thermo-mechanical behaviors of functionally graded SMP beams was established in this paper, and a simply supported beam was used as an example for solving and simulation, drawing some conclusions.
POLYMER COMPOSITES
(2021)
Article
Materials Science, Multidisciplinary
Breno H. S. Andrade, David D. S. Silva, Ieverton C. A. Brito, Rafael E. Caluete, Andre R. R. Sousa, Rodinei M. Gomes, Danniel F. Oliveira
Summary: This paper investigates the influence of strain rate on the mechanical properties and shape recovery percentage of CuAlMnTiB SMAs. The results demonstrate that the strain rate not only affects the mechanical properties but also alters the micromechanisms of fracture and residual strain. This is of significance for determining the strain rate conditions required to maintain the desired characteristics of the alloy in practical applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Xiaowei Hu, Yinong Liu, Fangmin Guo, Kaiyuan Yu, Daqiang Jiang, Yang Ren, Hong Yang, Lishan Cui
Summary: This study explores a new concept of the synergy between two constituent shape memory alloys (SMAs) in a composite to achieve a wide superelastic temperature window. The nanocrystalline NiTi/NiTiNbFe dual-SMA composite is able to achieve an ultra-wide superelastic temperature window of 336 degrees C, with superior properties compared to all NiTi-based shape memory alloys to date.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Instruments & Instrumentation
Lalit Bhola, A. K. Saurav, P. M. Mujumdar, P. J. Guruprasad
Summary: This study presents a numerical framework for a unidirectional shape memory polymer-based composite corrugated structure. The framework combines an empirically modified constitutive model of shape memory polymer with modified temperature-dependent laminate theory. Model parameters in the shape memory polymer constitutive relation are determined and calibrated from experimental tests. Subsequently, the numerical implementation of the shape memory polymer model is validated with experimental results from the three-point bending test. The simulations highlight the potential of the shape memory polymer-based composite corrugated structure as a load bearing adaptive structure for wing morphing applications.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Saeed Akbari, Amir Hosein Sakhaei, Sahil Panjwani, Kavin Kowsari, Qi Ge
Summary: This study utilizes multimaterial 3D printing to fabricate soft composite actuators with variable stiffness, capable of shape retention and recovery. By adjusting the thickness of the SMP layer, the effect on shape retention and recovery can be studied. Additionally, SMA wires are embedded to provide bending force, while resistive wires change the temperature and bending stiffness of the hinges through Joule heating.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Multidisciplinary
W. S. Cai, H. Z. Lu, H. Z. Li, Z. Liu, H. B. Ke, W. H. Wang, C. Yang
Summary: An ultrafine-grained NiTi-based shape memory alloy with excellent superelasticity was successfully prepared through spark plasma sintering, and its microstructural evolution and superelastic properties were investigated. The results showed that residual nano-scale amorphous phase and coherent or semi-coherent fcc (Ti,Zr)2Ni precipitate played important roles in achieving perfect superelasticity.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Shaohui Li, Daoyong Cong, Wenxin Xiong, Zhen Chen, Xin Zhang, Zhihua Nie, Shengwei Li, Runguang Li, Youkang Wang, Yuxian Cao, Yang Ren, Yandong Wang
Summary: In this study, a low-cost high-performance polycrystalline high-temperature shape memory alloy with extraordinary high-temperature superelasticity and a giant two-way shape memory effect has been developed. This alloy has the highest recoverable strain of superelasticity and two-way shape memory strain among bulk polycrystalline HTSMAs, showing great potential for high-temperature shape memory applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)