Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Dong Ma,Cheng Wang,Wenlong Xu,Shiyu Jia,Fangfang Qi
A novel shear thickening gel with micro-scale hard/soft interface structure and low reaction temperature was proposed in this article. The gel was named TH and used as core material within Kevlar fabrics. Storage modulus of TH was proved to increase by around two orders with increasing of shear frequency, and dynamic properties indicated that TH could dissipate or store more energy. TH can adhere with Kevlar fabrics well and satisfactorily fulfill the gap between fabrics. As a result, shock wave peak pressure and positive impulse decreased markedly. Wavelet decomposition analysis show that high frequency energy was filtered by protection materials. Meanwhile, impact resistance test suggested the existence of TH changed the stress propagation routes and avoided pulling out for Kevlar fabrics. Samples filled with TH demonstrated a better shock wave mitigation ability and impact resistance. Energy dissipation structures with TH have a promising prospect in the application of defending area.
研究领域:
材料科学
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机械工程
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Hanru Zhang,Chengqi Han,Gang Tong
Polyurea shows high promise as an elastomer in impact protection. However, significant challenges persist in the impact resistance mechanisms of the polyurea layer (PUAL) on ductile/brittle substrates under low-velocity impact. This study synthesized a high-strength, highly elastic polyurea and applied it to polyurea-6061Al/polyurea-epoxy resin composite structures. Low-velocity impact tests were conducted to obtain data on impact energy, impact strength, and residual deformation. Based on these results, a numerical model was established and validated. By combining experimental and simulation approaches, the impact resistance mechanism of polyurea was investigated. Results show that: (i) PUAL enhances the performance of the ductile 6061Al substrate more effectively than on the brittle epoxy resin; (ii) on the ductile substrate, PUAL exhibits a synergistic effect with the substrate, enhancing peak force and strain, while on the brittle substrate, enhancement relies on PUAL's deformation resistance; (iii) increased PUAL thickness significantly improves impact strength, but requires a balance with specific energy absorption, with solid PUAL outperforming discrete form; (iv) the optimal PUAL position varies with thickness, form, and substrate type. Overall, the impact resistance mechanisms of composite structures involve PUAL's recoverable multidirectional deformation, stress dispersion and energy transfer on the ductile substrate, structural maintenance for the brittle substrate, and interlayer interfacial dispersion. Therefore, it highlights polyurea's potential to improve low-velocity impact resistance.
研究领域:
材料科学
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机械工程
·
高分子科学
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复合材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Renjie Gu,Kunpeng Cheng,Lixiong Wen
Traditionally, study on the micromixing performance within reactors mostly relied on various competitive probe reactions through experiments or CFD simulations. In such simulations, component concentrations at the simulating-cell scale had to be firstly obtained and then applied to reaction kinetics to evaluate the micromixing. However, if reliable local concentration distributions can be obtained, no probe reactions are necessary anymore because intrinsically micromixing is about the mixing and distributions of the different components at the microscale . In this work, the engulfment model (E-model), without the aid of the probe reactions, was applied to simulate the micromixing time ( t m ) of a micro-impinging stream reactor based on the determination of the impinging zone through the flow field analysis with CFD. The effects of channel diameter and flow rates on t m were studied in details. The obtained t m agreed well with the results obtained through traditional approaches with the probe reactions.
研究领域:
化学工程
·
流体力学
·
微反应器技术
✓ 已验证
DOI
高影响因子
Energetic Materials Frontiers
·
2025
·
IF 3.9
Bo-wei Gao,Yan-ze Liu,Xiao-feng Guo,Xu-ran Xu,Hai-feng Yang,Guang-cheng Yang,Jing Lv,Ling-hua Tan
Based on a simple catechol-amine co-precipitation strategy and biomimetic adhesion characteristics, this study prepared a desensitized CL-20@PCPA core-shell energetic powder using the phenolic and amino compound containing low-cost polycatechol/polyamine (PCPA). The results indicate that the CL-20@PCPA composite powder exhibited an elevated characteristic drop height of impact sensitivity ( H 50 ) of 34.9 cm and a reduced friction explosion probability of 56% compared to pure CL-20. PCPA, containing catechol and amine groups, provided a stable platform for secondary modification to enhance the safety of the powder further. Notably, when the CL-20@PCPA@MXene powder was introduced into a propellant system, the resulting propellants displayed a high H 50 value of 20.3 cm while its heat of detonation remained unchanged. This study provides a simple and low-cost biomimetic interface modification strategy for preparing desensitized energetic materials.
研究领域:
材料科学
·
爆炸物安全
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Zhu Xiong,Lisheng Zhang,Songqi Ma,Yong Yang,Chuanzhi Zhang,Zhaobin Tang,Jin Zhu
Blends of entirely bio-sourced polymers, namely polylactide (PLA) and starch, have been melt-compounded by lab-scale co-extruder with castor oil (CO) as a plasticizer. The enrichment of castor oil on starch had great effect on the properties of the blends. If the castor oil was mainly dispersed in PLA matrix, the properties of the blends were poor, but when the hexamethylenediisocyanate (HDI) was grafted on starch granules the ready reactions between the hydroxyl on CO and the isocyante on the HDI-grafted starch (HGSTs) brought CO molecules enriched on starch particles. DSC analysis shows that the CO layer on starch has a positive effect on the crystallization of PLA in the ternary blend. The accumulation of CO on starch greatly improves the toughness and impact strength of PLA/starch blends. The grafting content of HDI on the starch granules primarily determined the compatibility and properties of the resulted blends.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Materials Today
·
2024
·
IF 7.2
Yi Yang,Ruixue Li,Chentong Gao,Ziwei Qin,Hao-Yang Mi,Binbin Dong,Xin Jing,Chuntai Liu,Changyu Shen
The intense mechanical impact that causes serious hazards has made stringent requirements for protective materials. Supramolecular elastomers integrating high toughness, impact resistance, and self-healing properties are desired as intelligent energy-absorbing materials. Herein, we construct a physical-chemical dual-network polyurethane (PU), via the dissociation and reconfiguration of dynamic hierarchical hydrogen bonds enables energy dissipation and self-healing properties, and the chemical cross-linking network maintains the stability and recoverability of the elastomer network. By tuning the proportion of the physical-chemical network in the elastomer, the supramolecular PU elastomer not only exhibits extraordinary ductility (1922.71 %), and excellent toughness (22.10 MJ m −3 ), but also shows outstanding impact resistance (an energy absorption efficiency of 85.6 %). The dissociation of dynamic hierarchical hydrogen bonds under high frequency renders the elastomer with special strain-hardening properties, which allows the material to absorb tremendous impact energy. The presence of a covalent crosslinking network prevents the creeping of the PU molecules and assists in the recovery and reconstruction of hydrogen bonds, as well as the self-healing of the material. In addition, the supramolecular PU demonstrates remarkable capability to enhance the energy absorption performance of commercial thermoplastic PU foam. By incorporating 30 % of supramolecular PU, the composite foam prepared by supercritical CO 2 foaming exhibits an outstanding energy absorption efficiency of 85.1 %, owing to the buffering property of the porous structure and the strain-hardening effect of the supramolecular PU. The physical-chemical dual-network elastomer provides a potential strategy for intelligent anti-impact materials and foams.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Tao Feng,Wanbo Hou,Mingde Tong,Hejun Li,Hongjiao Lin,Shifeng Wen
SiC nanowires (SiC nws ) modified SiC f /HfC-SiC composites were prepared by precursor infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI) methods. The microstructure, flexural strengths, impact and impact-ablation tests of the composites with and without SiC nws were investigated. The results showed that after introducing SiC nws , not only the retention rate of HfC ceramic produced by PIP was increased obviously, but also the fracture displacement of the modified composites was reduced due to the enhancement effect of SiC nws at interface between SiC fiber and matrix. After impact and impact-ablation, the strength retention of SiC nws modified composites was 91.6 % and 69.1 % respectively, higher than that of the composites without SiC nws (85.2 % and 54.8 %). As the impact resistance of the modified composites was improved by the pull-out and bridging of SiC nws , the ablation resistance of the impacted composites was enhanced as well.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
ANNALS OF BIOMEDICAL ENGINEERING
·
2022
·Vol. 50
·期 9
·1038-1052
·
IF 4.219
Du Zhibo,Li Zhijie,Wang Peng,Wang Xinghao,Zhang Jiarui,Zhuang Zhuo,Liu Zhanli
Intracranial pressure (ICP) during the interaction between blast wave and the head is a crucial evaluation criterion for blast-induced traumatic brain injury (bTBI). ICP variation is mainly induced by the blast wave transmission and skull deformation. However, how the skull deformation influences the ICP remains unclear, which is meaningful for mitigating bTBI. In this study, both experimental and numerical models are developed to elucidate the effect of skull deformation on ICP variation. Firstly, we performed the shock tube experiment of the high-fidelity surrogate head to measure the ICP, the blast overpressure, and the skull surface strain of specific positions. The results show that the ICP profiles of all measured points show oscillations with positive and negative change, and the variation is consistent with the skull surface strain. Further numerical analysis reveals that when the blast wave reaches the measured point, the peak overpressure transmits directly through the skull to the brain, forming the local positive ICP peak, and the impulse induces the local inward deformation of the skull. As the peak overpressure passes through, the blast impulse impacts the nearby skull supported by the soft and incompressible brain tissue and extrudes the skull outward in the initial position. The inward and outward skull deformation leads to the oscillation of ICP. These numerical analyses agree with experimental results, which explain the appearance of negative and positive ICP peaks and the synchronization of negative ICP with surface strain. The study has implications for medical injury diagnosis and protective equipment design.
研究领域:
生物力学
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医学工程
·
创伤医学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Ying Li,Meiqi Liu,Bindong Li
TP has similar advantages to dopamine and can form hydrogen bonds with energetic materials, enhancing interfacial interactions and achieving desensitization. In this study, RDX@TP and HNIW@TP were successfully prepared using TP as desensitized shells. The results indicated that the thermal decomposition temperature of RDX@TP and HNIW@TP increased by 4.4℃ and 11℃ respectively. Moreover, the impact sensitivity of RDX@TP and HNIW@TP decreased by 1.63 times and 2 times respectively. These findings demonstrate the successful application of TP as desensitized shells in energetic materials.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuangjie Xu,Huan Zheng,Chongqi Wang,Kaifeng Li,Xinyue Xu,Hongmeng Zhang,Yanda Ji,Lei Qiu,Hao Yang
Real-time impact monitoring is essential to ensure the safe service and efficient operation of the aircraft structure. By embedding the piezoelectric sensor array within the structure and applying appropriate signal processing algorithms, the impact position can be precisely localized, enabling real-time monitoring of the aircraft structure. With the development of supersonic aircraft, the fuselage skin of the aircraft is often exposed to high temperatures and other harsh environments during flight. However, the relatively low operating temperature significantly limits the application of traditional piezoelectric sensor arrays in high-temperature impact monitoring. The Mn-doped BiFeO 3 -BaTiO 3 ceramics exhibit excellent piezoelectric properties and high Curie temperature ( T c ), making them promising for high-temperature impact monitoring of the supersonic aircraft. In the present work, we fabricated a sensor array based on 0.7BiFeO 3 -0.3BaTiO 3 -0.25 %molMnO 2 (73BFBT-Mn) ceramic, which demonstrates a T c of 478 °C and a piezoelectric charge constant ( d 33 ) of 125 pC/N at room temperature. Significantly, the 73BFBT-Mn ceramic sensor array maintains a good impact localization accuracy from 25 °C to 200 °C combined with the improved path imaging algorithm. This is attributed to the construction of virtual paths within the sensor array and the extraction of impact signal features, which represent the major improvement compared to traditional path imaging algorithms. The 73BFBT-Mn ceramic sensor array exhibits significant prospects for high-temperature impact monitoring, particularly in the monitoring of supersonic aircraft fuselage skins.
研究领域:
材料科学
·
航空工程
·
传感器与执行器
·
信号处理
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2025
·Vol. 122
·期 15
·e2417978122
·
IF 9.1
Jiayu Wang,Shilong Zhang,Lingling Li,Xiaoliang Wang,Jiaofeng Xiong,Qingning Li,Weizheng Li,Feng Yan
Solvents within gels enhance the mobility of polymer chain segments while concurrently diminishing interchain interactions, thereby facilitating the ductility of glassy polymers at the cost of their mechanical strength. Here, we develop a solvent toughening strategy for the preparation of highly compressible and high-strength ionogels in the glassy state. This approach leverages the synergistic effects of the slow dissociation-shift kinetics of solvent ionic liquids and polymer crystallization. Ionogels exhibit an ultimate compressive stress of 2.3 GPa (at 98% compressive strain), toughness of 1219.3 MJ m−3, and energy dissipation rate of 81.9% (at 70% compression strain). The highly interacting ionic bonds of solvent and the fast crystallization of polymers under load toughen the ionogels and confer impact hardening and efficient energy dissipation behavior under fast impact. A 500-μm-thick ionogel coating can protect fragile items, such as glass, from impact damage. Ionogels, renowned for their impact resistance, hold promise for various applications across industries including human body implants, equipment, transportation, and aerospace.
研究领域:
材料科学
·
力学
·
工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2025
·
IF 4.7
Che Zhao,Yuxuan Zeng,Yuhan Zhou,Tianyu Wu,Meng Song,Lei Duan,Jiamei Dong,Yanlong Luo
Cross-linked polymeric damping materials with efficient energy dissipation mechanisms have attracted significant attention in impact protection applications. However, conventional viscoelastic damping materials frequently encounter limitations in processability and operational durability. Herein, a novel high-dielectric CaCu 3 Ti 4 O 12 /poly(lipoic acid) dynamic covalent network composite was introduced. This advanced material demonstrated an exceptional self-healing efficiency of 89.7% after 24 h at ambient temperature and remarkable reprocessability through thermally activated bond exchange reactions. Upon damage, the material's mechanical strength and integrity can be restored via the reformation of cross-linking points within the polymer network, thereby extending its operational lifespan. Notably, the synergistic combination of interfacial polarization effects from CaCu 3 Ti 4 O 12 particles and the dynamic equilibrium of coordination bonds establishes multiple energy dissipation pathways. This unique architecture achieves broadband damping performance with loss factors (tan δ) exceeding 0.3 across an extended frequency spectrum (0.009–100 Hz), coupled with a substantial enhancement in dielectric constant. The energy dissipation capability was verified through a steel ball rebound experiment, which demonstrated an exceptionally low rebound rate of 3.0%. This research offers an innovative design concept for developing sustainable impact-resistant materials. Highlights A novel high-dielectric self-healing CaCu 3 Ti 4 O 12 /poly(lipoic acid) damping material was successfully synthesized. The CaCu 3 Ti 4 O 12 /poly(lipoic acid) films exhibit outstanding self-healing ability and reprocessability. The CaCu 3 Ti 4 O 12 /poly(lipoic acid) composites achieve a superior impact resistance and a significantly elevated dielectric constant.
研究领域:
材料科学
·
高分子化学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）