【新文速递】2024年11月25日复合材料SCI期刊最新文章_ACT_Mechanical_Additive_System_Inspire_疲劳_断裂_复合材料_化学_隐身_通用_电子_增材_铸造_裂纹_理论_电机_材料

【新文速递】2024年11月18日复合材料SCI期刊最新文章

今日更新：Composite Structures 1 篇，Composites Part A: Applied Science and Manufacturing 3 篇，Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇Composite StructuresThree-dimensional graded metamaterials with customizable thermal responses under space-variant temperature stimuliKaiyu Wang, Zhengtong Han, Fan Lin, Xin-Lin Gaodoi:10.1016/j.compstruct.2024.118717在空间温度刺激下具有可定制热响应的三维梯度超材料Metamaterials with customizable thermal expansions are desirable for important engineering applications. However, existing metamaterials were designed by considering uniform temperature distributions. In the current study, a new design strategy is proposed to develop metamaterials with customizable thermal deformations under space-variant temperature (SVT) stimuli which are non-uniform. Three types of bi-material pyramidal units are first devised through using different material distributions and geometrical configurations. The coefficients of thermal expansion (CTEs) of these units are derived in closed-form expressions. Graded metamaterials are then constructed from the pyramidal units through combined periodic and graded tessellations. Based on targeted thermal deformations under prescribed stimuli, geometrical parameters are identified, and the thermal strains are determined using the newly derived analytical formulas and finite element simulations. The two sets of predictions are found to agree well, which indicates the effectiveness of the new design strategy for the graded metamaterials. The numerical results reveal that the graded metamaterials exhibit customizable uniform deformations under the SVT stimuli. In addition, targeted customizable thermal deformations with quadric-shape strain profiles are achieved in the graded metamaterials. Compared with the conventional design with uniform temperature distributions, the newly proposed design of metamaterials under non-uniform SVT stimuli is more versatile and flexible, thereby providing a systematic strategy for developing graded metamaterials.具有可定制热膨胀的超材料在重要的工程应用中是理想的。然而，现有的超材料都是考虑均匀温度分布来设计的。在当前的研究中，提出了一种新的设计策略来开发具有非均匀空间变温度（SVT）刺激下可定制热变形的超材料。通过不同的材料分布和几何结构，首先设计了三种类型的双材料金字塔单元。这些单元的热膨胀系数（CTEs）以封闭形式导出。然后，通过结合周期性和梯度镶嵌，从金字塔单元构建梯度超材料。根据在规定刺激下的目标热变形，确定几何参数，并利用新导出的解析公式和有限元模拟确定热应变。结果表明，两组预测结果吻合较好，表明了梯度超材料设计策略的有效性。数值结果表明，梯度超材料在SVT刺激下表现出可定制的均匀变形。此外，在梯度超材料中实现了具有二次型应变曲线的有针对性的可定制热变形。与传统的均匀温度分布设计相比，非均匀SVT刺激下的超材料设计更具通用性和灵活性，从而为梯度超材料的开发提供了系统的策略。Composites Part A: Applied Science and ManufacturingPrediction of compression after impact strength from surface profile of low-velocity impact damaged CFRP laminates using machine learningSaki Hasebe, Ryo Higuchi, Tomohiro Yokozeki, Shin-ichi Takedadoi:10.1016/j.compositesa.2024.108560基于机器学习的低速冲击损伤CFRP复合材料表面轮廓冲击后压缩强度预测Recently, Composite materials have been increasingly used in various actual structures, leading to active research on their damage and residual material properties. Therefore, the residual compressive strength of carbon fiber reinforced plastic subjected to low-velocity impacts has been considered. In particular, we determined the complexity of impact conditions that can occur in practical applications and the difficulty of obtaining internal damage information from experimental specimens. In addition, we applied machine learning to investigate the essential features calculated from surface profile data after the impact tests. This learning revealed that features representing changes in the contour of the specimen surface had high contributions. Therefore, the surface damages, such as fiber breakage and major matrix cracks, also influence the CAI strength.近年来，复合材料越来越多地应用于各种实际结构中，对其损伤和残余材料性能的研究也越来越活跃。因此，考虑了碳纤维增强塑料在低速冲击作用下的残余抗压强度。特别是，我们确定了在实际应用中可能发生的冲击条件的复杂性以及从实验样品中获得内部损伤信息的难度。此外，我们应用机器学习来研究从冲击试验后的表面轮廓数据计算出的基本特征。这一研究表明，表征试样表面轮廓变化的特征有很高的贡献。因此，纤维断裂、基体大裂纹等表面损伤也会影响CAI强度。COD and CSD based model for in-plane stiffness of symmetric laminates with cracks in plies and local delaminations: Analysis of crack face slidingJanis Varna, Rodrigo T.S. Freire, Mohamed Sahbi Loukil, Nawres J. Al-Ramahidoi:10.1016/j.compositesa.2024.108594 基于COD和CSD的层合板局部分层裂纹面内刚度模型：裂纹面滑动分析In-plane thermo-elastic constants of symmetric damaged laminates containing transverse cracks in plies and local delaminations starting from crack tip are predicted using a crack opening (COD) and crack sliding displacement (CSD) based approach. An exact elastic analysis shows that the displacement gap on the delamination crack surfaces does not enter the stiffness expressions explicitly. The delamination affects the stiffness via larger COD and CSD of the intralaminar crack. This means that the same expressions for cracked laminates with and without delaminations can be used but with different expressions for COD and CSD. Finite element method is used to analyze the CSD dependence on delamination length and crack density. The obtained approximative expressions for CSD are in a good agreement with FEM. It is shown that in cases when it depends on CSD only, the predicted shear modulus of laminates is in an excellent agreement with direct FEM calculations. The used homogenization over couples of off-axis plies (monoclinic materials) in CSD expressions for balanced laminates is validated.采用基于裂纹开度（COD）和裂纹滑动位移（CSD）的方法，预测了含有横向裂纹和从裂纹尖端开始的局部分层的对称损伤层合板的面内热弹性常数。精确的弹性分析表明，分层裂纹表面的位移间隙不显式地进入刚度表达式。分层通过层内裂纹较大的COD和CSD影响刚度。这意味着有和没有分层的裂纹层合板可以使用相同的表达式，但COD和CSD的表达式不同。采用有限元方法分析了裂纹强度随分层长度和裂纹密度的变化规律。所得的CSD近似表达式与有限元分析结果吻合较好。结果表明，在仅依赖CSD的情况下，层合板剪切模量的预测值与直接有限元计算值非常吻合。在平衡层压板的CSD表达式中，对离轴层对（单斜材料）使用的均匀化方法进行了验证。Multi-crosslinked Ta4C3TX MXene composites with “interlocked structure” for efficient gamma-ray shielding, behavioural detection and thermal management in nuclear environmentsXue Liu, Jianguo Deng, Yingchun Lu, Rong Huang, Fuhan Mai, Xin Li, Zhihua Deng, Lanxiang Ji, Xiaofeng Baidoi:10.1016/j.compositesa.2024.108597 具有“互锁结构”的多交联Ta4C3TX MXene复合材料，用于核环境中有效的伽马射线屏蔽，行为检测和热管理The creation of wearable protection materials with optimal overall performance is essential to meet the requirements of nuclear workers. Here, multilayer composites with “interlocked structure” were prepared by vacuum filtration and layer-by-layer assembly using Ta4C3TX MXene as filling, multi-crosslinked elastomers as matrix, and abrasive cloths as templates. To enhance the scattering attenuation, we constructed an alternating structure from two levels. When the template was 60 mesh, composites exhibited tensile strength at 8.95 MPa, tearing resistance at 72.59 N, and pull-out strength at 5.16 MPa. Gauge factor reached 19.41. Furthermore, the temperature of the composites could rise up to 88.5°C under a load of 1 sun and 1 V voltage, the mass attenuation coefficient for 59.6 KeV γ-rays was found to be 0.927 cm2/g. These indicate that the composites have excellent behavioural monitoring, thermal management and radiation protection capabilities, and have a wide range of applications within low-temperature nuclear environments.创造具有最佳综合性能的可穿戴防护材料对于满足核工作人员的要求至关重要。以Ta4C3TX MXene为填料，以多交联弹性体为基体，以磨料为模板，通过真空过滤和逐层组装制备了具有“互锁结构”的多层复合材料。为了增强散射衰减，我们从两层构造了一个交替结构。当模板为60目时，复合材料的抗拉强度为8.95 MPa，抗撕裂强度为72.59 N，抗拉强度为5.16 MPa。测量系数达到19.41。在1个太阳和1个 V电压的作用下，复合材料的温度最高可达88.5℃，对59.6 KeV γ射线的质量衰减系数为0.927 cm2/g。这表明该复合材料具有优异的行为监测、热管理和辐射防护能力，在低温核环境中具有广泛的应用前景。Composites Part B: EngineeringMicro-structure modified decalcified bone matrix scaffolds and bone marrow stem cell–chondrocyte co-cultures promote stable cartilage regenerationZheng Ci, Yingying Huo, Bin Tang, Genke Li, Zenghui Jia, Peiling Zhang, Pengli Wang, Jie Zhu, Xiao Song, Huitang Xia, Liang Duan, Guangdong Zhoudoi:10.1016/j.compositesb.2024.111976微结构改性脱钙骨基质支架与骨髓干细胞-软骨细胞共培养促进软骨稳定再生Achieving stable cartilage regeneration in vivo using bone marrow mesenchymal stem cells (BMSCs) has been a persistent challenge and requires the simultaneous resolution of two critical issues: a suitable scaffold and endochondral ossification. Decalcified bone matrix (DBM) is potentially an ideal scaffold because of its natural origin and non-toxic degradation. However, its large pore structures, poor mechanical properties after decalcification, and osteoinductive abilities limit its application for BMSC-based cartilage regeneration. To address these issues, we utilized gelatin (GT) freeze-drying, crosslinking technology to fabricate DBM-GT scaffolds and overcome the challenges posed by the pore structure and mechanical properties of DBM. We integrated BMSC–chondrocyte co-culture technology to address the issues of DBM osteogenic activity and endochondral ossification. Our results indicate that DBM-GT offered superior pore structure and mechanical properties over DBM, with an 86% increase in the cell-seeding efficiency, an 81.5% increase in the dry mechanical strength, and a remarkable 653.3% increase in the wet mechanical strength. Sequencing analysis showed that chondrocytes inhibited osteogenic differentiation and promoted chondrogenic differentiation by regulating the Wnt and HIF1 signaling pathways. Importantly, DBM-GT scaffolds loaded with seed cells (80% BMSCs and 20% chondrocytes) achieved regeneration of stable cartilage (in vitro and in vivo) and the complex morphology of chondrofibrous, alternating tracheal-like tissues. These achievements represent innovative solutions for expanding the application areas of DBM and overcoming the bottleneck of regenerating stable cartilage tissue in vivo using BMSCs.利用骨髓间充质干细胞（BMSCs）在体内实现稳定的软骨再生一直是一个持续的挑战，需要同时解决两个关键问题：合适的支架和软骨内成骨。脱钙骨基质（DBM）因其天然来源和无毒降解而成为一种理想的支架材料。但其孔隙结构大，脱钙后力学性能差，骨诱导能力差，限制了其在骨髓间充质干细胞软骨再生中的应用。为了解决这些问题，我们利用明胶（GT）冷冻干燥、交联技术制备了DBM-GT支架，克服了DBM的孔隙结构和力学性能带来的挑战。我们整合骨髓间充质干细胞-软骨细胞共培养技术来解决DBM成骨活性和软骨内成骨的问题。结果表明，DBM- gt具有优于DBM的孔隙结构和力学性能，细胞播种效率提高86%，干机械强度提高81.5%，湿机械强度提高653.3%。测序分析显示，软骨细胞通过调节Wnt和HIF1信号通路抑制成骨分化，促进软骨分化。重要的是，装载种子细胞（80% BMSCs和20%软骨细胞）的DBM-GT支架实现了稳定软骨（体外和体内）的再生，以及软骨纤维和气管样组织交替的复杂形态。这些成果为扩大DBM的应用领域和克服BMSCs在体内再生稳定软骨组织的瓶颈提供了创新的解决方案。Composites Science and TechnologyRVE Simulations of short fiber reinforced polyamide: Direct and inverse matrix parameter identification in view of the semi-crystalline polymer structurePaul Wetzel, Benjamin Schneider, Anna Katharina Sambale, Markus Stommel, Jan-Martin Kaiserdoi:10.1016/j.compscitech.2024.110961 短纤维增强聚酰胺的RVE模拟：基于半结晶聚合物结构的正反矩阵参数辨识This paper investigates the modeling capabilities of computational homogenization for the mechanical behavior of short fiber reinforced polyamide. Simulations on a representative volume element (RVE) with elastic fibers and an elastic–plastic matrix are compared to tensile experiments on specimens taken in parallel and transversal direction from injection molded plates. In view of the semi-crystalline polymer structure, focus is put on identifying the matrix parameters through two alternative methods:First, the matrix parameters are identified directly using tensile experiments on a non-nucleated and a nucleated unreinforced polyamide. In the RVE computations based on the non-nucleated grade, the composite stress–strain behavior is somewhat underestimated, and with the nucleated grade, the behavior is slightly overestimated. To explain this, the semi-crystalline polymer structure is studied. Polarized light microscopy images reveal that the non-nucleated grade has a coarser and the nucleated grade a finer spherulite structure, compared to the matrix present in the composite. However, the degree of crystallinity measured by differential scanning calorimetry is in a similar range.As an alternative, the matrix parameters are identified inversely by fitting the RVE model to the composite tensile experiments. As uncertainties with respect to the matrix material as well as possibly remaining simplifications in the micromechanical model are compensated for, this reverse engineering approach allows for a very good fit.本文研究了短纤维增强聚酰胺力学行为的计算均质化建模能力。将弹性纤维和弹塑性基体的典型体积元（RVE）模拟与平行方向和横向方向的注射成型板试样拉伸实验进行了比较。针对半结晶聚合物结构，重点通过两种方法识别基体参数：首先，通过非成核和成核非增强聚酰胺的拉伸实验，直接确定了基体参数。在基于非成核等级的RVE计算中，复合材料的应力-应变行为被略微低估，而对于成核等级，复合材料的应力-应变行为被略微高估。为了解释这一点，研究了半结晶聚合物的结构。偏振光显微镜图像显示，与复合材料中的基体相比，非成核级具有较粗的球晶结构，而成核级具有较细的球晶结构。然而，差示扫描量热法测量的结晶度在一个类似的范围内。作为一种替代方法，通过将RVE模型拟合到复合材料拉伸实验中来反演基体参数。由于基体材料的不确定性以及微力学模型中可能剩余的简化被补偿，这种逆向工程方法允许非常好的拟合。来源：复合材料力学仿真Composites FEM