Article
Engineering, Mechanical
Zhongying Ji, Shiyu Qin, Shuanhong Ma, Xin Jia, Xiaolong Wang, Feng Zhou
Summary: The study demonstrates the creation of a smart surface with oriented structures using an epoxy-based shape memory polymer incorporating Fe3O4 nanoparticles to achieve fast switching friction. By adjusting the topography and stiffness of the microstructures on the surface, remotely controlled locomotion is showcased, indicating potential for new intelligent surfaces and interfaces in various applications.
Article
Materials Science, Characterization & Testing
Yingyu Wang, Jichong Wang, Xiongqi Peng
Summary: A refined 3D finite strain viscoelastic constitutive model for thermally induced shape memory polymers is proposed, reducing the number of material parameters from seventeen to thirteen and simplifying the parameter identification process, leading to improved accuracy and applicability of the model.
Article
Mathematics, Applied
A. Bakhtiyari, M. Baghani, S. Sohrabpour
Summary: This study introduces a semi-analytical solution for describing shape memory polymers (SMPs) behavior based on nonlinear thermo-visco-hyperelasticity which incorporates internal state variables and rational thermodynamics. The method is applied to investigate the bending of multilayers in a dual-shape memory effect (SME) cycle for two different SMPs and a hyperelastic material. The predicted results are verified through finite element simulation, showing the high accuracy of the proposed solution in predicting multilayer SMP behavior. Due to its lower computational cost compared to the finite element method (FEM), this method can be employed as an effective tool for analyzing SMP behavior under various conditions.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2023)
Article
Materials Science, Biomaterials
Michaela R. Pfau, Kelly G. McKinzey, Abigail A. Roth, Lance M. Graul, Duncan J. Maitland, Melissa A. Grunlan
Summary: Research has shown that self-fitting shape memory polymer scaffolds prepared with star-polymer structures have lower fitting temperatures and faster degradation rates, potentially offering advantages for the treatment of irregular craniomaxillofacial bone defects.
JOURNAL OF MATERIALS CHEMISTRY B
(2021)
Article
Materials Science, Multidisciplinary
M. Frost, A. Jury, L. Heller, P. Sedlak
Summary: The study presents an enhanced constitutive model for NiTi-based alloys incorporating an intermediate R-phase transformation with loading-dependent transformation strain. Validated on experimental data, the model demonstrates capabilities for computational structural analysis in finite element software applications.
MATERIALS & DESIGN
(2021)
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, 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
Materials Science, Multidisciplinary
Bingyao Yan, Shuyong Jiang, Li Hu, Yanqiu Zhang, Dong Sun
Summary: Crystal plasticity finite element (CPFE) simulation is employed to investigate the plastic deformation mechanism of NiTi shape memory alloy (SMA) under canning compression at 400 degrees C, showing that plastic deformation is dominated by dislocation slip without stress-induced martensite phase transformation and deformation twinning. The CPFE model provides valuable insights into the texture evolution, stress and strain fields, as well as SSD and GND densities during the plastic deformation process of NiTi SMA.
MECHANICS OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
A. Foyouzat, H. Bayesteh, S. Mohammadi
Summary: The article explores the thermomechanical fracture responses of shape memory polymers (SMPs) under stress free-strain recovery and fixed strain-stress recovery loading cycles, evaluating the effect of phase transformation on fracture parameters using the extended finite element method (XFEM). The study shows that SMPs with initially cracked SMPs can fully preserve shape memory properties and may be applied to self-healing materials. However, the presence of cracks in the fixed strain-stress recovery process can reduce the structure's ability to provide desired reaction forces, with potential for crack healing through compressive forces in the force recovery cycle.
MECHANICS OF MATERIALS
(2021)
Article
Mechanics
Mahdi Baniasadi, Ebrahim Yarali, Alireza Foyouzat, Mostafa Baghani
Summary: Research on fracture behavior and self-healing properties of Shape Memory Polymers (SMPs) is a hot topic, with studies showing the potential exceptional performance of SMPs in various applications.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Engineering, Manufacturing
Zizheng Fang, Runzhi Lu, Jiada Chen, Qian Zhao, Jingjun Wu
Summary: In this study, tough glassy polymers with multiple shape memory effects were successfully fabricated through vat photopolymerization with the introduction of sacrificial non-covalent hydrogen bonding within the polymer network. The printed polymers exhibited excellent mechanical performance in the glassy state and showed multiple shape memory capability.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Biomedical
Michaela R. Pfau, Felipe O. Beltran, Lindsay N. Woodard, Lauren K. Dobson, Shelby B. Gasson, Andrew B. Robbins, Zachary T. Lawson, W. Brian Saunders, Michael R. Moreno, Melissa A. Grunlan
Summary: Self-fitting scaffolds prepared from biodegradable poly(epsilon-caprolactone)-diacrylate (PCL-DA) have shown promise in promoting bone formation and ingrowth in craniomaxillofacial (CMF) bone defects, as evidenced by histological analysis, micro-CT, and biomechanical push-out tests in a rabbit calvarial defect model. The results suggest that these scaffolds could potentially serve as an effective treatment option for CMF defects.
ACTA BIOMATERIALIA
(2021)
Article
Engineering, Mechanical
Yifu Chen, Haohui Zhang, Jiehao Chen, Guozheng Kang, Yuhang Hu
Summary: This study aimed to develop a constitutive model for a double network shape-memory hydrogel, calibrating it with experimental data to predict shape-fixing performance. The model was implemented into a three-dimensional finite element code to simulate the shape-memory behavior of the hydrogel in complex geometries.
ACTA MECHANICA SINICA
(2021)
Article
Materials Science, Multidisciplinary
Yong Zhang, Chao Yu, Di Song, Yilin Zhu, Qianhua Kan, Guozheng Kang
Summary: This study experimentally investigates the elastocaloric effect of NiTi shape memory alloy helical springs with different geometric parameters and applied loads. It is found that the elastocaloric performance can be tailored by adjusting the spring's geometric parameters and the applied load. A three-dimensional thermodynamic-consistent constitutive model is developed, and simplified analytical relations are derived to predict the cooling temperature and elastocaloric strength of the springs. The experimental data and predictions from both the finite element analysis and analytical relations are in good agreement, demonstrating the potential of developing cooling technology with high elastocaloric strength and low driving force.
MECHANICS OF MATERIALS
(2023)
Article
Energy & Fuels
Musaab Magzoub, Tobenna Anyaezu, Saeed Salehi, Guoqiang Li, Jizhou Fan, Catalin Teodoriu, Fatemeh K. Saleh, Arash Dahi Taleghani
Summary: The paper evaluates the performance of thermoset shape memory polymers in sealing near wellbore fractures of different sizes in geothermal wells, showing that a 3% by weight SMP and fiber blend can effectively plug a 1000 μm fracture. Increasing the weight concentration of the SMP to 6% is needed to plug a larger 3000 μm fracture. The study highlights the importance of key parameters such as type of loss circulation materials, concentration, and particle size distribution in optimizing the performance of drilling fluid loss treatment.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Keyu Zhu, Xitao Zheng, Jing Peng, Jiaming Sun, Ruilin Huang, Leilei Yan
Summary: This paper discusses the influence of multiple impacts on the compression strength of honeycomb sandwich structures with composite face sheets. It is found that the size of the impactor affects the turning point of the compression strength. Additionally, high impact energy leads to damage in the bottom face sheet and reduces the overall compression strength.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Danqian Wang, Yanfei Yue, Jueshi Qian
Summary: Magnesium Potassium Phosphate Cement (MKPC) as a binder for steel rebars shows improved corrosion resistance when subjected to carbonation, due to the increase in pH and the formation of a more protective oxide film.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Zhibin Li, Wenyu Wang, Pengcheng Xue, Xingyu Wei, Jian Xiong
Summary: This work proposes a design approach and manufacturing method for carbon fiber reinforced plastic (CFRP) corrugated sandwich truncated cones (CSTC) to improve their anti-debonding ability and ensure reliability. The study establishes theoretical models for CSTCs' stiffness and failure modes, which are verified through experiments and finite element analysis (FEA). The research reveals the effect of geometric parameters on failure modes and performs an optimal design for CSTC structures. The findings have significant implications for the design and application of lightweight CSTCs in constructions, such as launch vehicle adapters.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mingyu Zhang, Lei Chu, Jiahua Chen, Fuxun Qi, Xiaoyan Li, Xinliang Chen, Deng-Guang Yu
Summary: This review summarizes the different structures and construction methods of fibrous membranes with asymmetric wettability. It also reviews the biological applications of these membranes and suggests future challenges.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
E. Mofakhami, L. Gervat, B. Fayolle, G. Miquelard-Garnier, C. Ovalle, L. Laiarinandrasana
Summary: This study investigates the effects of fibre concentration on the mechanical response of welded glass-fibre-reinforced polypropylene (GF-PP). Experimental observations reveal a significant reduction in weld ratio, up to 60%, indicating a decreased strength compared to the bulk material. Increasing fibre content in the welded material results in a decrease in stress at break and strain at the maximum stress. The use of DIC technique and X-ray microtomography further confirms the localized strain amplification in the welded zone due to the significant increase in fibre density.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Emad Pourahmadi, Farjad Shadmehri, Rajamohan Ganesan
Summary: This research compares the mechanical properties of laminates manufactured using automated fiber placement and conventional autoclave curing methods. The results show that laminates manufactured using automated fiber placement have a lower interlaminar shear strength compared to laminates reconsolidated using autoclave curing. A finite element simulation method is proposed to quantitatively analyze these differences.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Johnny Jakobsen, Benny Endelt, Fahimeh Shakibapour
Summary: This study proposes a new bolted/pinned joining method for composite applications, which improves load transfer by introducing a patch-type reinforcement. Experimental results demonstrate significant improvements in both static and fatigue load conditions compared to existing methods. Finite element simulations highlight the advantage of this method, as it creates a more efficient load-transferring mechanism through different stress distributions.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Gisele G. Cintra, Janine D. Vieira, Daniel C. T. Cardoso, Thomas Keller
Summary: This paper proposes a novel approach to assess multi-crack behavior in layered fiber-polymer composites. The generated Compliance and R-curves provide useful insights into understanding the multiple delamination process and allow for separate evaluation of strain energy release rate (SERR) for each crack. The developed cohesive zone model successfully simulates the failure process zone of three parallel cracks, showing good agreement between the numerical model and experimental results.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Renil Thomas Kidangan, Sreedhar Unnikrishnakurup, C. Krishnamurthy, Krishnan Balasubramaniam
Summary: The induction heating process can accurately identify fiber orientation and stacking order, making it a valuable tool for large-area inspection and quality control in manufacturing fiber-reinforced composites.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Sungjun Hwang, Yousoo Han, Douglas J. Gardner
Summary: Bleached Kraft pulp, unbleached Kraft pulp, and old corrugated cardboard pulp are suitable for producing cellulose nanofibril suspensions. Spray drying is a fast, simple, cost-effective, and scalable drying method. Spray-dried cellulose nanofibrils can be used as reinforcing materials in polypropylene matrices. The particle size of cellulose nanofibrils affects the material properties.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mehdi Mahdavi, Abbas Zolfaghari
Summary: This study aims to improve the recovery forces of shape memory polymers (SMPs) through material extrusion additive manufacturing. By using glass fiber (GF) as reinforcement and manufacturing multi-layer composite specimens, it was found that PLA with 6.62% GF exhibited the best recovery force, which was further optimized through annealing heat treatment.
COMPOSITES PART B-ENGINEERING
(2024)
Review
Engineering, Multidisciplinary
Xiang Ao, Antonio Vazquez-Lopez, Davide Mocerino, Carlos Gonzalez, De-Yi Wang
Summary: The vulnerability of natural fibers to heat and fire poses a significant challenge for their substitution of traditional fiber reinforcements in composite materials. Natural fiber/polymer composites (NFCs) are regarded as potential candidates for engineering applications due to their environmental friendliness and low-impact sourcing. Thus, appropriate approaches need to be implemented to enhance the fire safety of NFCs. This review summarizes and discusses the latest understanding of flammability and thermal properties of natural fibers, with a special focus on their interaction with polymer matrix in fire behavior. Additionally, the latest developments in flame-retardant approaches for NFCs are reviewed, covering both flame retardancy and fire structural integrity. Finally, future prospects and perspectives on fire safety of NFCs are proposed, providing insights into further advancements of NFCs.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Cheng Wang, Siqi Huo, Guofeng Ye, Bingtao Wang, Zhenghong Guo, Qi Zhang, Pingan Song, Hao Wang, Zhitian Liu
Summary: The demand for multifunctional, transparent epoxy resin with superior dielectric, mechanical, and fire-safety performances is increasing in modern industries. Researchers have developed an epoxidized, phosphaphenanthrene-containing poly(styrene butadiene styrene) (ESD) for advanced fire-safe epoxy resin, which maintains high transparency and improves UV-blocking property. The addition of 10 wt% ESD results in improved mechanical properties, decreased dielectric constant and loss, and outperformance compared to other fire-safe epoxy resins. This research provides an effective method for developing multifunctional flame-retardant epoxy resin.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Bo Pang, Heping Zheng, Zuquan Jin, Dongshuai Hou, Yunsheng Zhang, Xiaoyun Song, Yanan Sun, Zhiyong Liu, Wei She, Lin Yang, Mengyuan Li
Summary: This study develops an internal superhydrophobic material (ISM) using waste denitrification fly ash, which maintains stable hydrophobicity under harsh conditions of use and does not rely on expensive fluor-based surface modifications. The synthesized ISM has excellent matrix strength, strong waterproof properties, and retains superhydrophobicity even at damaged or friction interfaces.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Meirbek Mussatayev, Qiuji Yi, Mark Fitzgerald, Vincent K. Maes, Paul Wilcox, Robert Hughes
Summary: Real-time monitoring of carbon fibre composites during Automated Fibre Placement (AFP) manufacturing remains a challenge for non-destructive evaluation (NDE) techniques. This study designed a directional eddy-current (EC) probe to evaluate the detectability of out-of-plane wrinkles. Experimental evaluations and finite element modeling were conducted to better understand the relationship between eddy-current density and defect detection. The findings suggest that the probe configuration with an asymmetric driver coil and differential pickup coils shows the best capability for wrinkle detection.
COMPOSITES PART B-ENGINEERING
(2024)