【新文速递】2024年11月28日固体力学SCI期刊最新文章

 

今日更新：International Journal of Solids and Structures 1 篇，Journal of the Mechanics and Physics of Solids 1 篇，Mechanics of Materials 1 篇，International Journal of Plasticity 1 篇，Thin-Walled Structures 6 篇

International Journal of Solids and Structures

Analytical and experimental studies on the sequential flaring-buckling behavior of combined bi-tubes in blind bolts

Jiaming Feng, Yuyin Sun, Wanjun Jin, Ridong Liao

doi:10.1016/j.ijsolstr.2024.113158

盲螺栓组合双管序贯扩曲行为的分析与实验研究

Combined bi-tubes are innovatively applied in modern composite blind bolts to provide the clamping force. In this study, the sequential flaring-buckling behavior of combined bi-tubes under axial compression on expanding dies was experimentally and analytically investigated. First, axial compression tests were performed on bi-tubes in three different dimension groups. Based on the test results, deformation modes and force–displacement curves were obtained to assess the specific energy absorption (SEA), clamping energy (ECL), and energy transfer ratio (ETR). The results show that bi-tubes have superior energy-absorbing capacity and clamping efficiency. SEA can reach 21 kJ/kg, and the ECL accounts for 50 ± 6 % of the total energy dissipated. Afterwards, a theoretical solution for flaring-buckling bi-tubes, which involves the flaring forming force, friction, and critical buckling force, was derived on the basis of an equal-thickness circular tube. A comparison of forces and deformation modes from analytical and experimental approaches leads to the observations that the analytical theory can assess the sequential flaring-buckling bi-tubes within acceptable proximity, the maximum deviations of flaring forming forces and critical buckling forces being 3.3 % and 6.6 %, and that it can effectively predict diverse deformation modes, i.e., a single bell-shaped bulb on the clamped structure, an upper bulb close to the platen, or double bulbs. This study is expected to provide guidance for the optimal design of the clamping structure on aircraft and automobiles.

复合双管在现代复合盲螺栓中创新性地用于提供夹紧力。在这项研究中，对在扩张模具上受轴向压缩的复合双管的渐进性失稳-屈曲行为进行了实验和理论研究。首先，对三种不同尺寸组的双管进行了轴向压缩试验。基于试验结果，获得了变形模式和力-位移曲线，以评估特定能量吸收（SEA）、夹紧能量（ECL）和能量传递比（ETR）。结果表明，双管具有优越的能量吸收能力和夹紧效率。SEA可达21千焦/千克，ECL占总能量耗散的50±6％。然后，基于等厚度圆管，推导了涉及鼓胀成形力、摩擦和临界屈曲力的渐进性失稳-屈曲双管的理论解。通过理论分析和实验方法对力和变形模式进行比较，可以得出以下观察结果：理论分析可以对可接受范围内的双管的渐进性鼓胀-失稳过程进行评估，鼓胀成形力的最大偏差为3.3%，失稳力的最大偏差为6.6%；它还可以有效地预测各种变形模式，如固定结构上的单个钟形凸起、靠近压板的上凸起或双凸起。这项研究有望为飞机和汽车的夹紧结构的优化设计提供指导。

Journal of the Mechanics and Physics of Solids

Foldable piecewise linear origami that approximates curved tile origami

Huan Liu, Richard D. James

doi:10.1016/j.jmps.2024.105962

可折叠的分段线性折纸，近似于弯曲的瓷砖折纸

Curved origami featuring curved tiles can store elastic energy and bias the structure toward a desired shape when subjected to appropriate constraints. Without constraints, however, a curved origami structure generally has infinitely many degrees of freedom. For engineering applications in which a particular folding motion is desired, a great many constraints have to be introduced. One natural strategy to reduce degrees of freedom is to discretize curved origami into piecewise linear origami while closely approximating the desired curved folding motion. Then, as we show, the degrees of freedom are vastly reduced (typically to one DoF in cases where the folding angle at the crease is not trivial, and excluding overall rigid body motions). In this paper we present a Lagrangian approach for constructing curved origami structures which is complementary to our approach in Liu and James (2024). Then, we generalize this approach to allow quite general curved creases. We outline a way to discretize curved crease patterns and present two optimization methods to refine these patterns. Our approach ensures that the deformed piecewise linear origami closely matches the folding angles and crease configurations of the curved origami. Piecewise linear origami structures that approximate curved origami offer promising potential for architectural and robotic design applications. They also give an efficient way to design desired smooth structures by optimizing finite-dimensional piecewise linear structures.

具有弯曲瓷砖的弯曲折纸可以存储弹性能量，并在受到适当的约束时使结构偏向所需的形状。然而，在没有约束的情况下，弯曲的折纸结构通常具有无限多个自由度。对于需要特定折叠运动的工程应用，必须引入许多约束条件。降低自由度的一种自然策略是将曲线折纸离散化为分段线性折纸，同时又近似于期望的弯曲折叠运动。然后，正如我们所示，自由度大大降低（通常在折痕处的折叠角度不是微不足道的情况下为一个DoF，并且排除了整体刚体运动）。在本文中，我们提出了一种构造弯曲折纸结构的拉格朗日方法，该方法与我们在Liu和James（2024）中的方法相补充。然后，我们将这种方法推广到允许相当一般的弯曲折痕。我们概述了一种离散化曲线折痕图案的方法，并提出了两种优化方法来细化这些图案。我们的方法保证了变形的分段线性折纸与弯曲折纸的折叠角度和折痕构型紧密匹配。近似曲面折纸的分段线性折纸结构为建筑和机器人设计应用提供了很好的潜力。通过优化有限维分段线性结构，给出了一种设计理想光滑结构的有效方法。

Mechanics of Materials

Predicting the evolution of texture and grain size during deformation and recrystallization of polycrystals using field fluctuations viscoplastic self-consistent crystal plasticity

Iftekhar A. Riyad, Marko Knezevic

doi:10.1016/j.mechmat.2024.105212

利用场波动粘塑性自洽晶体塑性预测多晶变形和再结晶过程中织构和晶粒尺寸的演变

This paper advances a recent formulation of a field fluctuations viscoplastic self-consistent (FF-VPSC) crystal plasticity model to predict not only the evolution of texture in polycrystalline metals undergoing deformation and recrystallization but also the evolution of grain size. The model considers stress and lattice rotation rate fluctuations inside grains to calculate intragranular misorientation spreads. The spreads are used for modeling of grain fragmentation during deformation and grain nucleation during recrystallization enabling the predictions of concomitant evolution of texture and grain size distributions. The evolutions of textures and grain size distributions are first simulated for commercially pure Cu undergoing severe plastic deformation (SPD) in high pressure torsion to agree well with corresponding experimental data. Next, the evolution of texture and grain size in an aluminum alloy (AA) 5182-O after simple tension and static recrystallization are predicted and compared with experiments. Finally, the predictions of texture and grain size distributions in a magnesium alloy WE43 undergoing a thermo-mechanical loading in the dynamic recrystallization regime are presented and compared with experiments. After validation, the model is coupled with the implicit finite element method (FEM) via a user-material subroutine (UMAT) in Abaqus to facilitate modeling of complex boundary conditions and geometries. The multilevel approach is referred to as FE-FF-VPSC in which every integration point embeds the FF-VPSC constitutive law, considering texture evolution and the directionality of deformation mechanisms operating at the single crystal level. FE-FF-VPSC is applied to simulate a sequence of rolling, recrystallization, and deep drawing of a circular cup of AA6022-T4. The simulated processing sequence demonstrates the versatility of the simulation framework developed in the present paper in not only predicting texture and grain size evolution and phenomena pertaining to behavior of materials but also geometrical shape changes important for the optimization of metal forming processes. To this end, the effects of initial texture and underlying anisotropy on the formation of earing profiles during deep drawing are simulated and discussed.

本文提出了一种新的场波动粘塑性自洽（FF-VPSC）晶体塑性模型，该模型不仅可以预测多晶金属在变形和再结晶过程中的织构演变，还可以预测晶粒尺寸的演变。该模型考虑了晶粒内部的应力和晶格旋转速率波动来计算晶粒内部的取向偏差扩展。扩展用于模拟变形过程中的晶粒碎裂和再结晶过程中的晶粒成核，从而预测织构和晶粒尺寸分布的伴随演变。首次模拟了商业纯铜在高压扭转下剧烈塑性变形（SPD）的织构演变和晶粒尺寸分布，与相应的实验数据吻合较好。其次，对铝合金（AA） 5182-O经过简单拉伸和静态再结晶后织构和晶粒尺寸的演变进行了预测，并与实验结果进行了比较。最后，对WE43镁合金在动态再结晶过程中的织构和晶粒尺寸分布进行了预测，并与实验结果进行了比较。验证后，通过Abaqus中的用户-材料子程序（UMAT）将模型与隐式有限元法（FEM）耦合，以方便复杂边界条件和几何形状的建模。多层方法被称为FE-FF-VPSC，其中每个积分点都嵌入了FF-VPSC本构律，考虑了织构演化和在单晶水平上运行的变形机制的方向性。采用FE-FF-VPSC模拟了AA6022-T4圆杯的轧制、再结晶和拉深过程。模拟的加工序列证明了本文开发的模拟框架的通用性，不仅可以预测材料的织构和晶粒尺寸演变以及与材料行为有关的现象，还可以预测金属成形工艺优化中重要的几何形状变化。为此，模拟并讨论了拉深过程中初始织构和下伏各向异性对耳纹轮廓形成的影响。

International Journal of Plasticity

The Derivation of CRSS in pure Ti and Ti-Al Alloys

Daegun You, Orcun Koray Celebi, Ahmed Sameer Khan Mohammed, Ashley Bucsek, Huseyin Sehitoglu

doi:10.1016/j.ijplas.2024.104187

纯Ti和Ti- al合金中CRSS的衍生

The work focuses on the determination of the critical resolved shear stress (CRSS) in titanium (Ti) and titanium-aluminum (Ti-Al) alloys, influenced by an array of factors such as non-symmetric fault energies and minimum energy paths, dislocation core-widths, short-range order (SRO) effects which alter the local atomic environment, and tension-compression (T-C) asymmetry affected by intermittent slip motion. To address these multifaceted complexities, an advanced theory has been developed, offering an in-depth understanding of the mechanisms underlying slip behavior. The active slip systems in these materials are basal, prismatic, and pyramidal planes, with the latter involving both 〈a〉and 〈c+a〉 dislocations. Each slip system is characterized by distinct Wigner-Seitz cell configurations for misfit energy calculations, varying partial dislocation separation distances, and unique dislocation trajectories—all critical to precise CRSS calculations. The theoretical CRSS results were validated against a comprehensive range of experimental data, demonstrating a strong agreement and underscoring the model's efficacy.

该研究旨在确定钛(Ti)和钛铝(Ti-Al)合金的临界解理应力(CRSS)，受到非对称断层能量和最小能量路径、位错芯宽度、改变局部原子环境的短程有序(SRO)效应以及由间歇滑移运动引起的拉伸压缩(T-C)不对称性的影响。为了解决这些复杂因素，开发了一种先进的理论，深入理解滑移行为背后的机制。这些材料中的活性滑移系统是基面、棱柱面和平面，后者涉及和<c+a>位错。每个滑移系统都有独特的威格纳-塞茨(Wigner-Seitz)胞结构，用于计算位错能，部分位错分离距离和独特的位错轨迹，这些都是精确计算CRSS的关键。理论计算的CRSS结果与广泛的实验数据相吻合，证明了模型的有效性。

Thin-Walled Structures

Inflation of a Toroidal Membrane within a Fluid-filled Elastic Spherical Enclosure

Satyajit Sahu, Soham Roychowdhury

doi:10.1016/j.tws.2024.112729

充液弹性球壳内环形膜的膨胀

The present research investigates the growth based inflation model of an inflated toroidal membrane within a fluid-filled environment enclosed by an elastic spherical cavity. This problem statement resembles the growth of toroidal vesicle membranes within biological cells. The toroidal membrane is described by hyperelastic Mooney–Rivlin model with meridional anisotropy. The rise in internal gauge pressure of the torus causes the surrounding incompressible fluid to exert a distributed radial force on the surface of the elastic sphere, resulting in its deformation. With a subsequent gradual increase in gauge pressure, a contact is initiated as the torus indents onto the inner surface of the elastic sphere. The contact condition is assumed to be frictionless, and a variational formulation is adopted for solving the contact problem. The maximum indentation as well as the generated contact stress are found to be higher with a lesser stiffness of the elastic spherical enclosure. As the contact patch grows, the phenomenon of membrane thinning is predominantly observed at the inner equator of the torus. The growth of the contact boundary varies linearly with increasing torus gauge pressure, but non-linearly with the fluid pressure within the spherical enclosure.

本文研究了弹性球腔包围的充液环境中膨胀环形膜的生长膨胀模型。这个问题陈述类似于生物细胞内环形囊泡膜的生长。环形膜采用具有子向各向异性的超弹性Mooney-Rivlin模型来描述。环面内部表压的升高，使周围不可压缩流体对弹性球表面施加分布径向力，造成弹性球变形。随着随后表压的逐渐增加，当环面缩进弹性球的内表面时，接触开始。假定接触条件为无摩擦，采用变分公式求解接触问题。最大压痕和产生的接触应力发现较高的刚度较小的弹性球面外壳。随着接触片的增大，在环面的内赤道处主要观察到薄膜变薄的现象。接触边界的增长随环面表压的增加呈线性变化，但与球壳内流体压力呈非线性变化。

First-order GBT for tapered regular convex polygonal tubes

Rodrigo Gonçalves

doi:10.1016/j.tws.2024.112735

锥形正则凸多边形管的一阶GBT

This paper presents an accurate and efficient first-order Generalized Beam Theory (GBT) for linearly tapered regular convex polygonal tubes, such as those widely employed in the construction industry. Even though tapered members require a significantly involved formulation, it is shown that it is possible to enforce the standard GBT assumptions exactly, without additional simplifications, a key aspect that (i) is essential for the accuracy and computational performance of the formulation and (ii) allows identifying the deformed configurations pertaining to inextensible deformation. Consequently, very accurate solutions are achieved even for complex cases, such as tubes with a high taper angle and undergoing localized deformation. The GBT deformation modes for the prismatic case are directly used, meaning that the proposed approach for tapered tubes does not require a specific GBT cross-section analysis procedure. All expressions are presented in a straightforward vector-matrix format, for implementation purposes. The excellent performance of the resulting displacement-based beam finite element and the advantages of the GBT modal decomposition features are highlighted through several numerical examples, where results obtained with refined shell finite element models are used for comparison purposes.

本文提出了一种精确有效的一阶广义梁理论（GBT），适用于建筑行业中广泛使用的线性锥形规则凸多边形管。尽管锥形构件需要一个非常复杂的公式，但研究表明，在没有额外简化的情况下，可以准确地执行标准GBT假设，这是一个关键方面，(i)对公式的准确性和计算性能至关重要，（ii）允许识别与不可扩展变形有关的变形配置。因此，即使对于复杂的情况，例如具有高锥度角和经历局部变形的管，也可以获得非常精确的解决方案。直接使用棱柱体情况下的GBT变形模式，这意味着锥形管的建议方法不需要特定的GBT截面分析程序。为了实现目的，所有表达式都以直接的向量矩阵格式呈现。通过几个数值算例，突出了基于位移的梁有限元的优异性能和GBT模态分解特征的优势，其中使用精细化壳有限元模型获得的结果用于比较目的。

Study on the blast mitigation behavior of metakaolin-based foam geopolymer (MKFG) as tunnel cushioning layer against external blasts

Wenxin Wang, Fangduo Xiao, Hang Zhou, Shikun Chen, Zhen Wang, Yi Liu, Dongming Yan

doi:10.1016/j.tws.2024.112752

偏高岭土基泡沫地聚合物（MKFG）作为隧道外爆缓冲层的缓震性能研究

In this study, the similarity model contact blast test and numerical simulations were carried out to investigate the protective behavior of tunnels with a metakaolin-based foam geopolymer (MKFG) cushioning layer under blast impacts. In contact blast test, Rock-Foam Geopolymer-Concrete Tunnel (RFGCT) structures with various densities (400, 600 and 800 kg/m3) of MKFG were tested against a blast impact of 100 g TNT. In numerical simulations, several parameters covering TNT equivalent as well as density and thickness of cushioning cladding, were comprehensively discussed. Test results show that the attenuation rate of cushioning cladding to the blast wave is enhanced from 34.7% to 71.0% with the reduction of the density of MKFG from 800 kg/m3 to 400 kg/m3. Meanwhile, the reflected tensile wave generated by blast wave falls from 1.85 MPa to 0.66 MPa. When the density of MKFG exceeds 600 kg/m3, the cladding exists obvious defects in energy absorption at the bottom of mid-span and free end, which gradually disappear as the TNT equivalent and cushioning thickness increases. Increasing thickness of the MKFG-400 can lead to excessive overall displacement of the tunnel lining. Full-size uncertainty analysis shows that at TNT equivalents of 2000 kg, the thickness of MKFG-800 as cushion is recommended to be 2-3 times that of the lining.

采用相似模型接触爆破试验和数值模拟方法，研究了在爆炸冲击作用下，采用变高岭土泡沫地聚合物（MKFG）缓冲层对隧道的保护作用。在接触爆炸试验中，采用不同密度（400、600和800 kg/m3）的MKFG对岩石-泡沫地聚合物-混凝土隧道（RFGCT）结构进行了100 g TNT爆炸冲击试验。在数值模拟中，对TNT当量、缓冲包层密度和厚度等参数进行了全面讨论。试验结果表明，当MKFG密度从800 kg/m3降低到400 kg/m3时，缓冲包层对冲击波的衰减率从34.7%提高到71.0%；同时，冲击波产生的反射拉伸波从1.85 MPa下降到0.66 MPa。当MKFG密度超过600 kg/m3时，包层在跨中底部和自由端存在明显的吸能缺陷，随着TNT当量和缓冲厚度的增加，吸能缺陷逐渐消失。增加MKFG-400厚度会导致隧道衬砌整体 位移过大。全尺寸不确定度分析表明，在TNT当量为2000 kg时，MKFG-800作为垫层的厚度建议为衬里厚度的2-3倍。

Residual compressive behaviour and CFRP strengthening of SRCFST columns after combined damage of fire and lateral impact

Sun-Hang Ji, Wen-Da Wang, Yan-Li Shi, Long Zheng

doi:10.1016/j.tws.2024.112756

SRCFST柱在火灾和侧向冲击复合损伤后的残余压缩性能及CFRP加固

Composite structure may be subjected to impact and fire during its service life, and the damaged member face challenges in the performance evaluation and strengthening. This study conducted an experimental and numerical investigation into the residual compressive behaviour of steel-reinforced concrete-filled steel tubular (SRCFST) columns after combined damage of fire and lateral impact. Thirteen damaged specimens under axial loading were tested, with three specimens strengthened with carbon fiber reinforced polymer (CFRP). The failure modes of specimens, residual compressive capacity, deflection distribution, and strain development were discussed. The finite element analysis model on the residual compressive behaviour of damaged SRCFST columns was then developed and calibrated. The full-range analysis on the residual performance of damaged columns was carried out, included the temperature development, distribution of axial load and bending moment, degradation mechanism of bearing capacity, stress development, and effects of fire exposure time. The parameter study was finally conducted to investigate the effects of various factors on the residual compressive performance of damaged SRCFST columns. The results indicated that increasing the fire exposure time and impact height reduces visibly the residual compressive capacity of fire-damaged specimens. As the two damages accumulate, the axial load of each component gradually reduces, while the axial compressive capacity proportion redistributes.

复合材料结构在使用寿命期间可能会受到冲击和火灾的影响，受损构件在性能评估和加固方面面临挑战。本文对钢管混凝土柱在火灾和侧向冲击双重作用下的残余压缩性能进行了试验和数值研究。对13个轴向损伤试件进行了试验，其中3个试件采用碳纤维增强聚合物（CFRP）加固。讨论了试件的破坏模式、残余抗压能力、挠度分布和应变发展情况。建立了钢筋混凝土混凝土损伤柱残余压缩特性有限元分析模型并进行了标定。对受损柱的残余性能进行了全面分析，包括温度发展、轴向荷载和弯矩分布、承载力退化机制、应力发展以及火灾暴露时间的影响。最后进行了参数研究，探讨了各种因素对损伤混凝土混凝土柱残余抗压性能的影响。结果表明，增加火灾暴露时间和冲击高度可明显降低火灾损伤试件的残余抗压能力。随着两种损伤的累积，各构件轴向载荷逐渐减小，轴向抗压能力比例重新分配。

General analytical solution for stress intensity factors of two asymmetrical radial cracks emanating from a single hole in an infinite isotropic plate

Shengfan Bi, Yong Huang, Hao Wang

doi:10.1016/j.tws.2024.112759

无限大各向同性板中单孔产生的两个不对称径向裂纹应力强度因子的一般解析解

Thin-walled perforated structures are widely used in modern industry, where cracks may emanate from the hole edges due to structural loads and manufacturing processes, potentially reducing the reliability of the structure. This paper presents a general solution for stress intensity factors (SIFs) of two asymmetrical radial cracks emanating from a single hole in an infinite isotropic plate, utilizing complex variable theory. Hole shapes, including quasi-square, parabolic, and pentagonal, etc., are considered as instances, and SIFs at crack tips and stress distributions around the hole edge are provided. The analytical solutions are compared with existing literature and finite element method (FEM) results, which confirm the reliability. Under uniaxial tension or pure shear, for quasi-square, parabolic, and pentagonal shapes with equal crack lengths (a/H=0.5), the maximum stress occurs near the geometric vertices. As the crack length increases, the influence of the hole shape diminishes, causing SIF values to approach those of a Griffith crack.

薄壁穿孔结构在现代工业中得到了广泛应用，但由于结构载荷和制造工艺的原因，孔边缘可能会产生裂纹，从而降低结构的可靠性。本文利用复变函数理论提出了一种通用的解法，用于计算两个不对称的径向裂纹从单个孔中萌生出的无限各向同性板的应力强度因子（SIFs）。考虑了包括准方形、抛物线形和五边形等孔形状作为实例，并提供了裂纹尖端和孔边缘的应力分布。将解析解与现有文献和有限元法（FEM）结果进行了比较，证实了其可靠性。在单轴拉伸或纯剪切作用下，对于具有相等裂纹长度（a/H=0.5）的准方形、抛物线形和五边形孔形状，最大应力出现在几何顶点附近。随着裂纹长度的增加，孔形的影响逐渐减弱，导致SIF值接近Griffith裂纹的值。

Diffusion bonding of TC4/TB8 titanium alloys with an interlayer by regulating temperature: Microstructure and mechanical performance

Tianle Li, Renhao Wu, Man Jae SaGong, Zaigham Saeed Toor, Hyoung Seop Kim

doi:10.1016/j.tws.2024.112760

调节温度对TC4/TB8钛合金间层扩散连接的影响：组织与力学性能

Diffusion bonding of α+β type TC4 (Ti-6Al-4V) and metastable β type TB8 (Ti-15Mo-2.7Nb-3Al-0.2Si) alloys with interlayer addition was systematically investigated by regulating temperature, revealing the discrepancies in interfacial microstructure and mechanical performance of the joints. Microstructural evolution at the TC4/Ti interfaces and TB8/Ti interfaces can be attributed to atomic interdiffusion and α/β transformation depending on temperature. Additionally, 7 of the 12 α variants that comply with the Burgers orientation relationship with β parents at the transitional layer are identified. The elongation of the bonded samples upon the tensile direction perpendicular to the interfaces becomes decreased compared to that of samples subjected to the tensile direction parallel to the interfaces. The dislocation characteristics and fracture models are analyzed after plastic deformation. This study indicates that a two-step method (first high-temperature and short-duration, then low-temperature and long-duration) can optimize the microstructure and mechanical performance of joints for Ti alloys exposed to high temperatures.

通过调节温度，系统研究了层间添加α+β型TC4 （Ti-6Al-4V）和亚稳型TB8 （Ti-15Mo-2.7Nb-3Al-0.2Si）合金的扩散结合，揭示了界面组织和接头力学性能的差异。TC4/Ti界面和TB8/Ti界面的微观组织演变可归因于原子间扩散和随温度的α/β转变。此外，12个α变体中有7个在过渡层与β亲本符合Burgers取向关系。与平行于界面的拉伸方向相比，在垂直于界面的拉伸方向上，粘结试样的伸长率降低。分析了塑性变形后的位错特征和断裂模式。本研究表明，采用高温短持续时间、低温长持续时间两步法可以优化钛合金高温接头的组织和力学性能。