今日更新：Composite Structures 4 篇，Composites Part A: Applied Science and Manufacturing 1 篇，Composites Science and Technology 1 篇Composite StructuresNumerical and Experimental Validation of Fiber Metal Laminate Structure for Li-ion Battery Protection Subjected to High-velocity Impact LoadingSigit Puji Santosa, Teresa Nirmaladoi:10.1016/j.compstruct.2024.117924高速冲击载荷下金属纤维层压结构对锂离子电池保护的数值与实验验证A novel structural protection for a Li-ion battery module based on fiber metal laminate (FML) was developed to address Electric Vehicle (EV) ground impact issues on the road. A new high-velocity impact test methodology to verify the battery structural protections and experimental validation was proposed. The FML was chosen due to its high strength-to-weight ratio. Finite element models, which consist of FML and lithium ferro phosphate batteries, were developed and iterated to find the best structural configuration. The numerical simulation results correlated well with the experiments. The FML model simulation allows for observation of the step-by-step perforation process and failure modes of the FML. In the full model experiment, the safety valve of the battery was compressed for 3.28 mm (3.42 mm in simulation). The subsequent experiment showed that the FML exhibited good protection for lithium-ion batteries, which was indicated by no change in the battery voltages during the high-velocity impact test.为了解决电动汽车在道路上的地面碰撞问题，开发了一种基于纤维金属层压板(FML)的新型锂离子电池模块结构保护。提出了一种新的高速冲击试验方法来验证电池的结构保护和实验验证。选择FML是因为它的高强度重量比。建立了由FML和磷酸铁锂电池组成的有限元模型，并进行了迭代，以找到最佳的结构配置。数值模拟结果与实验结果吻合较好。FML模型模拟允许观察逐步穿孔过程和FML的失效模式。在全模型实验中，电池安全阀被压缩3.28 mm(仿真为3.42 mm)。随后的实验表明，FML对锂离子电池具有良好的保护作用，在高速冲击试验中电池电压没有变化。Effect of fibre hybridization and stacking sequence on the low velocity impact response of flax/basalt/aluminum composite-metal jointsMuhammad Umar bin Ashraf, Aamir Mubashar, Manzar Masud, Hassan Ejaz, Syed Hameed Hussain, Muhammad Subhan Dilawardoi:10.1016/j.compstruct.2024.117925纤维杂化和叠层顺序对亚麻/玄武岩/铝复合金属接头低速冲击响应的影响A lot of composite materials with better impact resistance and better strength and stiffness can be manufactured these days. Many researchers have been using different materials to form new composites to understand their impact performance. This paper discusses such an attempt to make new composites by utilizing the concept of hybridization and then proposes which among them has better strength and performance under low-velocity impact (LVI) loading. In this work, circular patches of composites made up of a combination of basalt and flax fibers were used while being bonded with aluminum plate Al 2024-T3 of 3 mm thickness. The three different configurations which include asymmetric, symmetric, and sandwich were prepared using vacuum assisted bagging process and their impact performances were investigated using the Drop Weight Impact test. The results obtained were analyzed and they concluded that the asymmetric configuration of basalt/flax composite has better impact resistance, and strength and is better to use in structural components of automobiles, and the defense industry as compared to the other two.目前可以制造出许多具有更好的抗冲击性和更好的强度和刚度的复合材料。许多研究人员一直在使用不同的材料来形成新的复合材料，以了解它们的冲击性能。本文利用杂化的概念对这种制备新型复合材料的尝试进行了讨论，并提出了在低速冲击载荷下哪种材料的强度和性能更好。在这项工作中，使用由玄武岩纤维和亚麻纤维组合而成的圆形斑块复合材料，同时与3 mm厚度的铝板Al 2024-T3粘合。采用真空辅助装袋工艺制备了非对称、对称和夹层三种不同的装袋结构，并通过落锤冲击试验研究了它们的冲击性能。对所得结果进行了分析，得出结论:玄武岩/亚麻复合材料的不对称结构与其他两种相比，具有更好的抗冲击性和强度，更适合用于汽车结构件和国防工业。Lightweight honeycomb furniture panels with discreetly located strengthening blocksJerzy Smardzewski, Maciej Tokarczykdoi:10.1016/j.compstruct.2024.117927 轻巧的蜂窝家具面板与谨慎定位的加强块Furniture manufacturers indicate they know the benefits of lightweight honeycomb panels but still expect their higher mechanical properties. This work presents a numerical and experimental approach to designing new tables manufactured of paper honeycomb panels with discreetly arranged reinforcing blocks in the core. The main goal was to determine whether the discrete arrangement of the blocks affects the strength and amount of energy absorbed by the newly designed tables and stiffness of honeycomb panels. Optimization reduced the weight of the panels by up to 30%. At the same time, their linear elastic modulus was increased from 1579 MPa to 1771 MPa. After ten load cycles, tables with discrete reinforcements have a stiffness up 86.85% to 87.20% of the stiffness of the reference table. After destructive tests up 89.96% to 91.16%. Ultimately, the test results demonstrate the effectiveness of replacing wide slats with discreetly placed reinforcing blocks in the core structure.家具制造商表示，他们知道轻质蜂窝板的好处，但仍然期望其更高的机械性能。这项工作提出了一种数值和实验方法来设计由纸蜂窝板制造的新桌子，在核心处精心布置增强块。设计的主要目标是确定砖块的离散排列是否会影响新设计的桌子和蜂窝板的刚度所吸收的能量和强度。优化后的面板重量减少了30%。同时，其线弹性模量由1579 MPa提高到1771 MPa。经过10次荷载循环后，离散加筋表的刚度比参考表的刚度高86.85% ~ 87.20%。经破坏性试验上升89.96%至91.16%。最终，试验结果证明了在核心结构中用谨慎放置的配筋块代替宽板板的有效性。Modelling of Mode I Delamination using a Stress Intensity Factor Enhanced Cohesive Zone ModelDevon C. Hartlen, John Montesano, Duane S. Cronindoi:10.1016/j.compstruct.2024.117928基于应力强度因子增强内聚区模型的I型分层建模Cohesive zone modelling is a common approach to capture delamination in composite laminate structures. Recent experimental advancements now enable the direct measurement of Mode I traction-separation responses (TSRs) from a single specimen using the composite rigid double cantilever beam (cRDCB), overcoming a major obstacle in using cohesive zone modelling to model delamination. However, TSRs measured experimentally with the cRDCB specimen capture damage response as well as the stiffness contribution of the adjacent laminae, which can introduce significant artificial compliance into numerical models when modelling delamination separately from intralaminar behaviour. A two-stage analysis procedure utilizing a crack tip compensation function is presented to enhance the TSRs measured with the cRDCB specimen to accurately model Mode I delamination. The analysis procedure is demonstrated to improve the accuracy of delamination prediction within the statistical variation of published experimental data. Furthermore, the transferability of TSRs measured with cRDCB specimens is explored using available experimental DCB data. It is shown that the onset of damage and early damage behaviours measured with the cRDCB specimen appear to be transferable between geometries, whilst large-scale damage mechanics remain geometry dependent.内聚区建模是捕获复合材料层合结构中分层现象的常用方法。最近的实验进展现在可以使用复合刚性双悬臂梁(cRDCB)直接测量单个试样的I型牵引分离响应(tsr)，克服了使用内聚区建模来模拟分层的主要障碍。然而，用cRDCB试样实验测量的tsr捕获了损伤响应以及相邻层的刚度贡献，当将分层与层内行为分开建模时，这可能会在数值模型中引入显著的人工顺应性。提出了一种利用裂纹尖端补偿函数的两阶段分析程序，以提高用cRDCB试样测量的tsr，以准确地模拟I型分层。结果表明，该分析方法可以在已发表实验数据的统计变异范围内提高分层预测的准确性。此外，利用现有的实验数据，探讨了用cRDCB样品测量的tsr的可转移性。研究表明，用cRDCB试样测量的损伤开始和早期损伤行为似乎可以在几何形状之间转移，而大规模损伤力学仍然依赖于几何形状。Composites Part A: Applied Science and ManufacturingA dual cone actuator with high energy density and long fatigue life by developing a nano-silica reinforced dielectric elastomer compositeYuhao Wang, Yingjie Jiang, Wenpeng Zang, Xuzhi Ma, Wenju Wu, Jiashuai Yao, Nanying Ning, Ming Tiandoi:10.1016/j.compositesa.2024.108039利用纳米二氧化硅增强介电弹性体复合材料制备高能量密度、长疲劳寿命的双锥致动器Dielectric elastomer actuator (DEA) is considered as one of the most promising soft actuators due to its light weight, good flexibility, high actuated strain and energy density. Herein, a novel DEA material is developed by introducing a kind of SiO2 nanoparticles with strong interfacial polarizability into polydimethyl(methylvinyl) siloxane (PMVS). The 7.5 SiO2/PMVS DEA exhibits a high actuated strain of 31.3% and blocked stress of 68.4 kPa, 2.4 and 2.9 times of pure PMVS DEA. A dual cone DEA (DCDEA) device was self-designed by using 7.5 SiO2/PMVS films, which possesses a high actuated displacement of 1.3 mm, output force of 0.3 N and energy density of 4.7 J/kg. More importantly, because of the high elasticity and strong interfacial interaction, the 7.5 SiO2/PMVS DCDEA exhibits a long fatigue life of 500,000 times, and thus a full-life energy density of 2.3×106 J/kg, 39 times higher than that of the VHB based DCDEA.介质弹性体作动器(DEA)因其重量轻、柔韧性好、致动应变和能量密度高而被认为是最有前途的软作动器之一。本文将具有强界面极化能力的SiO2纳米颗粒引入聚二甲基(甲基乙烯基)硅氧烷(PMVS)中，制备了一种新型的DEA材料。7.5 SiO2/PMVS DEA的驱动应变高达31.3%，阻滞应力为68.4 kPa，分别是纯PMVS DEA的2.4倍和2.9倍。采用7.5 SiO2/PMVS薄膜自行设计了双锥DEA (DCDEA)装置，其驱动位移为1.3 mm，输出力为0.3 N，能量密度为4.7 J/kg。更重要的是，由于高弹性和强界面相互作用，7.5 SiO2/PMVS DCDEA具有50万次的长疲劳寿命，因此其全寿命能量密度为2.3×106 J/kg，比基于VHB的DCDEA高39倍。Composites Science and TechnologyConstructing a new multiscale “soft-rigid-soft” interfacial structure at the interphase to improve the interfacial performance of carbon fiber reinforced polymer compositesYongke Tan, Junhui Liu, Yujing Li, Qi Wang, Weibo Zhou, Yuhui Ao, Ming Lidoi:10.1016/j.compscitech.2024.110458 在界面构建一种新的多尺度“软-硬-软”界面结构，以提高碳纤维增强聚合物复合材料的界面性能The high strength and toughness of Carbon Fiber-Reinforced Polymers (CFRPs) are the main requirements for their properties in various fields. Herein, the “soft-rigid-soft” structure has been designed by us to achieve the aim of the improvement for the CFRP strength and toughness simultaneously. The soft-rigid-soft structural interface layer of CF was firstly constructed by carbon nanotubes (CNT) and Tannin/Aminopropyl isobutyl POSS (TA/NH2-POSS). The interfacial shear strength (IFSS) of the modified carbon fiber composite was 111.94 MPa, which was 84.08 % higher than that of the untreated fiber (60.81 MPa). Moreover the interlaminar shear strength(ILSS) and impact strength were increased by 50.43 % and 80.37 %. Enhancement of interface performance is mainly ascribed to CNT and TA/NH2-POSS, because they can effectively which is more effective to consume energy and decentralize stress. In this paper, the strength and toughness of CFRPs ware effectively improved by the in-depth and detailed design of the “soft-rigid-soft” multi-scale structure.碳纤维增强聚合物(CFRPs)的高强度和高韧性是其在各个领域性能的主要要求。为此，我们设计了“软-刚-软”结构，以达到同时提高CFRP强度和韧性的目的。首先用碳纳米管(CNT)和单宁/氨基丙基异丁基POSS (TA/NH2-POSS)构建了CF的软-硬-软结构界面层。改性碳纤维复合材料的界面抗剪强度(IFSS)为111.94 MPa，比未改性碳纤维复合材料(60.81 MPa)提高了84.08 %。层间剪切强度(ILSS)和冲击强度分别提高了50.43 %和80.37 %。纳米碳纳米管和TA/NH2-POSS对界面性能的增强主要归功于它们能有效地消耗能量和分散应力。本文通过对“软-刚-软”多尺度结构进行深入细致的设计，有效地提高了cfrp的强度和韧性。来源：复合材料力学仿真Composites FEM
