【新文速递】2023年11月11日固体力学SCI期刊最新文章

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今日更新：International Journal of Solids and Structures 1 篇，Mechanics of Materials 1 篇，Thin-Walled Structures 2 篇

International Journal of Solids and Structures

Multi-scale numerical simulation of fracture behavior for the gadolinia-doped ceria (GDC) under mechano-electrochemical coupling fields at high temperature

Huang Runze, Sun Yi, Yang Zhiqiang

doi:10.1016/j.ijsolstr.2023.112564

高温机械-电化学耦合场下钆掺杂陶瓷（GDC）断裂行为的多尺度数值模拟

The fracture toughness of gadolinia-doped ceria (GDC) solid oxide fuel cells (SOFCs) electrolyte with a central crack is significantly reduced under the mechano-electrochemical coupling fields at high temperature. In this work, an atom-to-continuum (AtC) multi-scale method combining the finite element method (FEM) and the molecular dynamics (MD) simulation is developed. Firstly, the AtC multi-scale method is validated by investigating the uniaxial tensile stress-strain curves of GDC with a central crack at different temperatures. Then, based on the theory of fracture mechanics, the macrostructure of GDC is transformed into a microscopic intermediate transition model, and a detailed computational procedure for analyzing the fracture toughness of the macrostructure of the GDC is given by the AtC multi-scale method. Finally, the fracture toughness of GDC macrostructure under the mechano-electrochemical coupling fields is studied by the proposed approach. The simulation results show that the fracture toughness of 10GDC and 20GDC under the mechano-electrochemical coupling fields is clearly reduced compared to the uniaxial tensile loading. Among them, the fracture toughness of 10GDC under the mechano-electrochemical coupling fields is decreased by 12.28% and 30.67% at 800℃ and 900℃, and the fracture toughness of 20GDC under the mechano-electrochemical coupling fields is decreased by 17.25% and 29.52% at 800℃ and 900℃. These findings are critical in predicting the fracture behavior of GDC electrolyte under real working conditions.

钆掺杂铈（GDC）固体氧化物燃料电池（SOFCs）电解质在高温机械-电化学耦合场作用下，中心裂纹的断裂韧性显著降低。本研究开发了一种结合有限元法（FEM）和分子动力学（MD）模拟的原子到连续（AtC）多尺度方法。首先，通过研究带有中心裂纹的 GDC 在不同温度下的单轴拉伸应力-应变曲线，验证了 AtC 多尺度方法。然后，基于断裂力学理论，将 GDC 的宏观结构转化为微观中间过渡模型，并通过 AtC 多尺度方法给出了分析 GDC 宏观结构断裂韧性的详细计算程序。最后，利用所提出的方法研究了机械-电化学耦合场下 GDC 宏观结构的断裂韧性。模拟结果表明，与单轴拉伸加载相比，10GDC 和 20GDC 在机械电化学耦合场下的断裂韧性明显降低。其中，10GDC在机械电化学耦合场下的断裂韧性在800℃和900℃时分别降低了12.28%和30.67%，20GDC在机械电化学耦合场下的断裂韧性在800℃和900℃时分别降低了17.25%和29.52%。这些发现对于预测 GDC 电解液在实际工作条件下的断裂行为至关重要。

Mechanics of Materials

The viscoelastic behavior of lignin: Quantification through nanoindentation relaxation testing on hot-pressed technical lignin samples from various origins

Schwaighofer Michael, Königsberger Markus, Zelaya-Lainez Luis, Lukacevic Markus, Serna-Loaiza Sebastián, Harasek Michael, Zikeli Florian, Friedl Anton, Füssl Josef

doi:10.1016/j.mechmat.2023.104864

木质素的粘弹性行为：通过对不同产地的热压工业木质素样品进行纳米压痕松弛测试进行量化

Lignin, the second most abundant organic polymer on earth, is one of the primary causes of the viscoelastic behavior of plants. An accurate characterization of its viscoelastic properties is essential for predicting the time-dependent response of natural materials, including wood and plant fibers, and for advancing lignin-based materials and their production methods, such as 3D printing of biocomposites. To enrich the still rather sparse knowledge on the viscoelasticity of lignin, we re-evaluate nanoindentation relaxation tests performed on five hot-pressed technical lignins extracted from different feedstocks, using three different extraction methods. The viscoelastic indentation problem is addressed using the method of functional equations combined with the homogenization theory to account for the production-induced porosity. This evaluation procedure allows for quantitatively assessing the viscoelastic properties of lignin, which can be very accurately described by an isochoric four-parameter Burgers model. Remarkably, the viscoelastic properties of all tested lignins are practically identical and independent of the feedstock and the extraction processes.

木质素是地球上含量第二高的有机聚合物，是植物粘弹性行为的主要成因之一。准确描述木质素的粘弹性能对于预测木材和植物纤维等天然材料随时间变化的响应，以及推进木质素基材料及其生产方法（如生物复合材料的三维打印）至关重要。为了丰富有关木质素粘弹性的知识，我们采用三种不同的提取方法，对从不同原料中提取的五种热压工业木质素进行了纳米压痕松弛测试。粘弹性压痕问题采用函数方程法结合均质化理论来解决，以考虑生产引起的孔隙率。该评估程序可定量评估木质素的粘弹性能，并可通过等速四参数伯格斯模型对其进行非常精确的描述。值得注意的是，所有受测木质素的粘弹性能几乎完全相同，且不受原料和提取工艺的影响。

Thin-Walled Structures

Seismic Performance of Weak-Beam-Type Steel Low-to-Middle-Rise Moment-Resisting Frame Determined by Local Buckling of Square Hollow Section Columns

Yamada Satoshi, Miyazawa Hiroki, Iyama Jun

doi:10.1016/j.tws.2023.111359

通过方形空心截面柱的局部屈曲确定弱梁型钢中低层力矩支撑框架的抗震性能

This study performed incremental dynamic analyses to investigate the relationship between the seismic performance and deformation capacity of the column of weak-beam-type steel moment-resisting frames (MRFs) with square hollow section (SHS) columns. A hysteresis model that accurately simulates the local buckling cyclic behavior was used for the analysis. From analytical results, a relationship between the required strength of the weak-beam-type steel MRFs and the width-to-thickness ratio of the SHS columns was obtained. Also, safety margin of MRFs up to collapse was evaluated in the relationship with the width-to-thickness ratio of the SHS column.

本研究进行了增量动态分析，以研究采用方形空心截面（SHS）柱的弱梁型钢力矩抵抗框架（MRF）的抗震性能与柱变形能力之间的关系。分析中使用了能精确模拟局部屈曲循环行为的滞后模型。根据分析结果，得出了弱梁型钢 MRF 所需强度与 SHS 柱宽厚比之间的关系。此外，还评估了 MRF 在坍塌前的安全裕度与 SHS 柱的宽厚比之间的关系。

High-fidelity prediction and temperature-rise mechanism for low-velocity impact of triaxially braided composites

Liu Peng, Cai Yinglong, Zhao Zhenqiang, Zhang Chao

doi:10.1016/j.tws.2023.111360

三轴编织复合材料低速冲击的高保真预测和温升机制

An elastoplastic mechanical-thermal constitutive model was integrated into the development of a mesoscale finite element model. This model aimed to analyze the temperature rise phenomenon and failure behavior of composites under impact loading conditions. Triaxially braided carbon/epoxy composite specimens were subjected to low-velocity impact using a drop weight tester, and the temperature variations within the specimens were monitored using an infrared camera. The numerical predictions successfully reproduced the observed failure modes and accurately captured the temperature distribution. A numerical study was performed to explore the main factors of temperature rise, indicating that plastic work of pure matrix and fracture transformed energy of fiber tow are the primary sources of temperature rise. The transverse specimen was found to exhibit superior energy absorption capacity under high-energy impacts.

在中尺度有限元模型的开发过程中集成了弹塑性机械-热构成模型。该模型旨在分析复合材料在冲击加载条件下的温升现象和破坏行为。使用落锤试验机对三轴向编织碳/环氧复合材料试样进行低速冲击，并使用红外摄像机监测试样内部的温度变化。数值预测成功地再现了观察到的失效模式，并准确捕捉到了温度分布。数值研究探讨了温升的主要因素，表明纯基体的塑性功和纤维束的断裂转化能是温升的主要来源。研究发现，横向试样在高能冲击下表现出卓越的能量吸收能力。

来源：复合材料力学仿真Composites FEM

【新文速递】2023年11月13日复合材料SCI期刊最新文章

今日更新：Composites Part B: Engineering 1 篇，Composites Science and Technology 1 篇Composites Part B: EngineeringBolted joint method for composite materials using a novel fiber/metal patch as hole reinforcement — Improving both static and fatigue propertiesJakobsen Johnny, Endelt Benny, Shakibapour Fahimehdoi:10.1016/j.compositesb.2023.111105采用新型纤维/金属补片作为孔补强的复合材料螺栓连接方法——提高静态和疲劳性能Several joining methods exist, and these are generally categorized as bolted joining methods, adhesive bonding methods, or hybrids of the two. Over the years several joining techniques have been proposed to improve the load transfer between components. This paper presents a new bolted/pinned joining methods for composite applications. This is done by introducing a new patch-type reinforcement. Both static and fatigue test results are presented and compared with unreinforced bolted joint data. Experimental data shows that significant improvements are obtained for both static and fatigue load conditions when this new joining method is utilized. Different metrics are used in the paper to compare the performance of the presented joining methods with existing methods. These metrics are a load transferring efficiency factor, bearing stress, and percentage improvement compared to a reference sample. For most of these metrics, the presented joining method performs similarly or significantly better than existing solutions. In addition, finite element simulations highlight that the advantage of the presented joining method is that the load is not only carried by compressive stresses above the loaded hole but also by tensile stresses below the hole. Therefore a much more efficient load-transferring mechanism is created with the presented joining method.存在几种连接方法，这些方法通常分为螺栓连接方法，粘合剂连接方法或两者的混合。多年来，人们提出了几种连接技术来改善构件之间的载荷传递。提出了一种新的复合材料螺栓/钉接方法。这是通过引入一个新的贴片类型的强化来实现的。给出了静力和疲劳试验结果，并与未加筋螺栓连接数据进行了比较。实验数据表明，采用这种新型连接方法，在静载荷和疲劳载荷条件下均能取得显著的改善。本文使用不同的度量来比较所提出的连接方法与现有方法的性能。这些指标是负载传递效率系数、轴承应力和与参考样品相比的改进百分比。对于这些指标中的大多数，所提出的连接方法的执行与现有解决方案相似或明显更好。此外，有限元模拟表明，该连接方法的优点在于，载荷不仅由加载孔上方的压应力承担，而且由孔下方的拉应力承担。因此，采用所提出的连接方法创建了一种更有效的荷载传递机构。Composites Science and TechnologyManufacture and characterisation of a structural supercapacitor demonstratorNguyen Sang, Anthony David B., Katafiasz Tomas, Qi Guocheng, Razavi Seyedalireza, Senokos Evgeny, Greenhalgh Emile S., Shaffer Milo S.P., Kucernak Anthony R.J., Linde Peterdoi:10.1016/j.compscitech.2023.110339 结构超级电容器演示器的制造与表征Structural power composites, a class of multifunctional materials, may facilitate lightweighting and accelerate widespread electrification of sustainable transportation. In the example considered in this paper, structural power composite fuselage components could provide power to open aircraft doors in an emergency and thus reduce or eliminate the mass and volume needed for supercapacitors currently mounted on the doors. To demonstrate this concept, an 80 cm long multifunctional composite C-section beam was designed and manufactured, which powered the opening and closing of a desktop-scale composite aircraft door. Twelve structural supercapacitor cells were made, each 30 cm × 15 cm × 0.5 mm, and two stacks of four cells were integrated into the web of the beam by interleaving and encasing them with low-temperature-cure woven carbon fibre/epoxy prepreg. This article culminates by considering the engineering challenges that need to be addressed to realise structural power composite components, particularly in an aerospace context.结构动力复合材料是一种多功能材料，可以促进轻量化和加速可持续交通的广泛电气化。在本文所考虑的示例中，结构动力复合材料机身部件可以在紧急情况下提供打开飞机舱门的动力，从而减少或消除目前安装在舱门上的超级电容器所需的质量和体积。为了证明这一概念，设计并制造了一个80 厘米长的多功能复合c截面梁，它为桌面级复合飞机舱门的打开和关闭提供动力。制作了12个结构超级电容器电池，每个30 cm × 15 cm × 0.5 mm，并通过交错和包裹低温固化编织碳纤维/环氧预浸料将两堆四个电池集成到梁的网状结构中。本文最后考虑了实现结构动力复合材料部件需要解决的工程挑战，特别是在航空航天环境中。来源：复合材料力学仿真Composites FEM