今日更新：International Journal of Solids and Structures 2 篇，International Journal of Plasticity 2 篇，Thin-Walled Structures 9 篇
International Journal of Solids and Structures
Self-excited fluctuation of sliding velocity induced by LuGre friction in a minimal mechanical model
Balazs J. Bekesi, Gabor Csernak
doi:10.1016/j.ijsolstr.2025.113293
最小力学模型中LuGre摩擦引起的滑动速度自激波动
The paper explores various bifurcations that can occur due to the variation of the linear internal damping (bristle damping) term in the LuGre friction model. To capture the essence of the nonlinear effects associated with friction, we consider a minimal mechanical model: a block sliding on a horizontal surface, which is subjected to a constant external force and the LuGre friction force with a viscous damping term. Despite the simplicity of the mechanical model, six different bifurcation scenarios are identified, involving Hopf bifurcations. Due to the emerging limit cycles – that may undergo fold or homoclinic bifurcations, as well – the slipping velocity and the friction force fluctuate near the Stribeck characteristic at sufficiently large bristle damping values. This phenomenon can be considered as a self-excited counterpart of the well-known frictional lag phenomenon.
The determination of interfacial strength in Al/SiC long fibre composites
Luke J. Rollings, Samuel A. McDonald, M.J. Roy, Philip J. Withers
doi:10.1016/j.ijsolstr.2025.113335
Al/SiC长纤维复合材料界面强度的测定
The interfacial properties have been measured for a novel AA6061/SiC-C coated silicon carbide SM3256 monofilamentary fibre (Al/SiC f ) MMC with a variant of the single fibre test. In this test, fibre fragmentation is followed in situ using synchrotron X-ray diffraction to probe the axial fibre elastic strains as a function of applied loading, while X-ray radiography is used to follow the fracture sequence. In this way, the variation in axial fibre stress along the fibre is tracked and hence the variation in interfacial shear stress along the fibre inferred at stages of fibre fragmentation. Prior to loading, the fibre was in a state of axial compression ( ≈ 280 MPa) due to thermal residual stresses representative of cooling from 200 °C. During the fragmentation process, the variations in axial strain and interfacial stress show characteristic “stick–slip” behaviour, where the fibre interface must exceed a threshold stress ( τ deb = 94 ± 10 MPa), close to the shear strength of the matrix before debonding. Once debonded, the fibre slides at a frictional shear stress, τ fr , initially of around 40 MPa, but falling with increased sliding distance to around τ fr = 15 ± 5 MPa. Radiography taken during loading, and post-mortem, indicates that interfacial failure occurs at the fibre-coating interface, leaving coating material lining the pull-out within the matrix. The accumulation of coating damage may be responsible for the progressive decrease in sliding stress with increased sliding. These sliding stresses, are much lower than observed for comparable Ti/SiC composites, and would facilitate significant fibre-pull-out and fibre bridging under fatigue conditions.
Strain Gradient-induced Size Effect of Nickel-Titanium Shape Memory Alloys
Jae-Hoon Choi, Hyemin Ryu, Ji-Young Kim, Kwang-Hyeok Lim, Gi-Dong Sim
doi:10.1016/j.ijplas.2025.104309
应变梯度诱导的镍钛形状记忆合金尺寸效应
This study investigates size effect in nickel-titanium (NiTi) shape memory alloys (SMAs), focusing on their elastic deformation and phase transformation behaviors. A series of experiments, including bulk-scale tension tests, micro-scale tension, compression, and cantilever bending tests, were conducted to observe the effect of specimen dimensions on SMA behavior. Micro-scale tension and compression tests unveiled a notable asymmetry in the stress-induced phase transformation, irrespective of specimen dimensions. Moreover, micro-cantilever bending tests, spanning a thickness range from 1.9 to 21.0 μm, revealed a significant increase in both the effective elastic modulus and phase transformation stress as the beam thickness decreased. A constitutive model has been developed to address the tension/compression asymmetry and size effect based on couple stress theory, and implemented in finite element analysis of beam structures. Finally, experimental results were compared with simulation outcomes, and the deformation mechanisms responsible for the size effect were discussed. The growing prominence of SMAs in micro/nano-scale applications highlights the necessity of understanding and accounting for size effects. Therefore, developing the capability to measure and simulate size effects is crucial for ensuring the effective utilization of SMAs in these scales.
A texture-dependent yield criterion based on Support Vector Classification
Jan Schmidt, Surya R. Kalidindi, Alexander Hartmaier
doi:10.1016/j.ijplas.2025.104311
基于支持向量分类的纹理相关屈服准则
Conventional yield criteria for anisotropic plasticity rely on linear transformations of the stress tensor to map the directional dependence of critical stress tensors at yield onset onto a unit sphere in stress space. These linear transformations are made material specific by a number of anisotropic parameters, which need to be determined by experimental procedures for each material. One drawback of this approach is that these anisotropic parameters cannot be explicitly expressed as functions of the crystallographic texture. Hence, any change in the texture of a material, as it occurs during cold deformation, requires a complete re-parametrization of the yield function. In this work, we present a data-oriented yield criterion based on Support Vector Classification (SVC) that is an explicit function of the crystallographic texture. This texture-dependency is achieved by including the coefficients of the general spherical harmonics (GSH) series expansion of the orientation distribution function (ODF) to the feature space of the machine learning model. The capabilities of the proposed yield criterion are demonstrated by training the model on a dataset containing micromechanical data from over 8000 distinct cubic-orthorhombic textures. The trained SVC combines the efficiency of classical phenomenological models with the flexibility of elaborate CP models. It provides a path to efficient hierarchical materials modeling as the anisotropy of the macroscopic yield onset is explicitly linked to the crystallographic texture.
Testing, simulation and design of built-up cold-formed steel-lightweight concrete (CFS-LWC) composite beams subjected to elevated temperatures
Rohola Rahnavard, Hélder D. Craveiro, Rui A. Simões, Luís Laím, Aldina Santiago, Leroy Gardner
doi:10.1016/j.tws.2025.113212
高温下冷弯钢-轻量混凝土（CFS-LWC）组合梁的试验、模拟和设计
Cold-formed steel (CFS) products are lightweight, structurally efficient and highly versatile, making them suitable for a wide range of construction applications. Although studies have been performed to analyse the flexural behaviour of CFS composite beams at room temperature, their performance at elevated temperatures has yet to be investigated; this is, therefore, the focus of the present study. Through experiments, the structural fire performance of innovative built-up CFS-lightweight concrete (LWC) composite beams is examined. Two full-scale fire tests on simply-supported CFS-LWC composite beams are presented. The test setup, test procedure and obtained results, including the temperature evolution, fire resistance time and failure modes, are described. A numerical modelling study is also presented through which additional insights into the observed structural behaviour are gained. Comparisons between the experimental results and those determined according to EN 1994-1-2 design provision are presented. The results showed that, despite the studied CFS-LWC composite sections being beyond the scope of the code, good predictions of fire resistance were obtained.
Tensile and shear performance of detachable tapered-head bolt inter-module connection of steel modular structure
Anling Zhang, Jiadi Liu, Zhihua Chen
doi:10.1016/j.tws.2025.113228
钢组合结构可拆卸锥头螺栓模间连接的抗拉剪切性能
The connections between modular units significantly impact the construction speed and load-bearing capacity of modular steel structures. However, most existing inter-module connections struggle to meet the installation requirements at central connections, often necessitating openings in the module columns, walls, or floor slabs to provide installation space. This leads to internal redecoration after the connections have been installed, reducing construction efficiency and increasing costs. The detachable tapered-head bolt connection is a new type of connection that enables rapid installation and removal of central connection in modular buildings. In this paper, the tensile and shear performance of the connection under static loading is investigated, and the failure mode, bearing capacity and load-displacement response of the connection are investigated. The results indicate that the tensile failure mode of the connection includes the pull-out of the tapered-head bolt or the fracture of weld seam of the upper corner base plate. The shear failure mode is characterized by the shearing of the bolt and bearing-yield failure in the upper corner base plate. It is obtained that the thickness of the upper corner base plate and side plate as well as the diameter of the tapered-head bolt are the key design parameters of the connection. It is recommended that the thickness of the side plate should not be greater than that of the baseplate, otherwise the material strength of the side plate will not be fully utilized and the economy of the connection design will be reduced. Furthermore, the simplified analytical model of tensile resistance of the connection is established, and the calculation formula for the tensile capacity of the connection is developed. Additionally, the study confirms that the shear capacity of the connection can be calculated using the method outlined in GB50017-2017. These research results provide a reliable design basis and reference for the engineering application of detachable tapered-head bolt inter-module connection.
Defects in double-sided incremental forming of woven fabric prepreg: experimental and numerical analysis
Peng Xu, Xiaoqiang Li, XiaoBing Li, Yi Wang, Weizhao Zhang, Hongrui Dong, Quan Zhi
doi:10.1016/j.tws.2025.113229
机织物预浸料双面增量成形缺陷：实验与数值分析
Forming processes of fiber reinforced polymers have been widely investigated for decades, driven by the need for lightweight, high-performance components in industries such as aerospace and automotive. However, the traditional forming techniques for composites often depend on the use of dies, which can be expensive and time-consuming to produce, resulting in increased overall manufacturing costs and extended production timelines, particularly for small batch production and prototype manufacturing. In this study, a die-less forming method, namely double-sided incremental forming (DSIF), was firstly investigated for the forming of woven fabric prepregs. Key manufacturing parameters, including the auxiliary dummy sheets (material, thickness and combinations) and tool diameters as well as their influence on forming quality, were systematically investigated. The mechanisms underlying the formation of macroscopic defects, such as wrinkling and fabric breakage, were analyzed through both experimental and numerical approaches. Results showed that dummy sheet selection and tool diameter significantly impact the prepreg forming quality in DSIF and defect-free parts can be obtained through optimized parameters. Specially, the combination of a hard upper dummy sheet and soft lower dummy sheet helped mitigate deformation discrepancies between the sheets and reduced prepreg wrinkling, while larger tool diameters minimized yarn failure by alleviating the high local contact pressures on the prepreg. The study can provide insights for future research and highlights the potential of DSIF for industrial applications, enabling more efficient small batch production and prototype manufacturing of complex composite parts.
Mechanical Properties of a Novel Mechanical Metamaterial with Multi-stable and Mono-stable Characteristics
Min Sun, Zhiwei Qiu, Qiang Chen, Hongshuai Lei, Xia Hua, Zheng Zhang, Yi Song, Shaofei Jiang, Diyong Huang, Haonan Fu
doi:10.1016/j.tws.2025.113230
一种具有多稳定和单稳定特性的新型机械超材料的力学性能
This study designed a novel mechanical metamaterial with multi-stable and mono-stable characteristics, fabricated using carbon fiber composite through a hot-pressing process. The mechanical properties of the designed mechanical metamaterial were obtained through quasi-static compression tests, and the effects of structural geometric parameters on its mechanical performance were analyzed. The finite element model of the mechanical metamaterial was established, and the comparison between the simulation and experiment results showed good agreement. A torque test platform was constructed to measure the torque for transitions between the multi-stable and mono-stable characteristics. The results indicate that transitioning from mono-stable to multi-stable characteristics requires a higher torque than transitioning from multi-stable to mono-stable characteristics. The designed mechanical metamaterial has both multi-stable and mono-stable characteristics, which have potential for a wide range of applications in the field of impact energy absorption as well as vibration attenuation.
Experimental Study of Non-reinforced Thin-walled Concrete-filled Double Skin Steel Tubular Bridge Columns with Socket Connection
Jiang Yi, Fuxiang Zhu, Wenjing Xu
doi:10.1016/j.tws.2025.113231
无筋薄壁双皮钢管混凝土承插连接桥柱试验研究
A novel non-reinforced thin-walled concrete-filled double skin steel tubular (NRTW-CFDST) structure with a socket connection is proposed for bridge columns. The advantages of this column include the absence of reinforcement, elimination of formwork installation and removal, and ease of customization, making it ideal for the rapid construction of short-line bridge piers with individualized size and height. Through experiments and finite element simulation analysis, the bending capacity and seismic performance of connection joints are investigated, and design recommendations for the novel column are provided. Experimental results indicate that the failure mode of the column is characterized by concrete crushing due to bending at the plastic hinge, and the full hysteresis curves indicate its good seismic performance. Importantly, the joints remained undamaged, demonstrating a significant reserve of bending capacity. For optimal performance, it is recommended to use a socket depth of 1.0 D to 1.2 D (D is the column section width) and a 6 mm thick base end plate. This configuration ensures adequate bending stiffness of the pier structure and a reasonable failure location at the plastic hinge.
提出了一种新型无钢筋薄壁双皮钢管混凝土承插连接结构。该柱的优点包括无需加固，无需安装和拆卸模板，易于定制，非常适合快速建造具有个性化尺寸和高度的短线桥墩。通过试验和有限元模拟分析，对连接节点的抗弯能力和抗震性能进行了研究，提出了新型柱的设计建议。试验结果表明，该柱的破坏模式为塑性铰处弯曲导致混凝土破碎，其全滞回曲线表明其具有良好的抗震性能。重要的是，接头保持完好无损，显示出弯曲能力的显著储备。建议插座深度为1.0 D ~ 1.2 D （D为柱截面宽度），底座端板厚度为6mm，以获得最佳性能。这种结构保证了桥墩结构有足够的抗弯刚度和合理的塑性铰失效位置。
Nonlinear response of high-strength cold-formed steel built-up members subject to cyclic compression
Shin Rui Kho, Adeline LingYing Ng, Daniel TingWee Looi, Hieng-Ho Lau, Emad Gad, Krishanu Roy
doi:10.1016/j.tws.2025.113233
循环压缩作用下高强度冷弯型钢组合构件的非线性响应
Cold-formed steel (CFS) built-up sections have attracted attention for their enhanced strength and stability over single channels. While previous research has focused on the axial behaviour of CFS built-up sections under monotonic compression, studies on their cyclic performance are limited. Cyclic actions can affect the material properties and potentially cause early failure, making it crucial to understand the cyclic behaviours of CFS built-up sections. This research examined the cyclic responses of G550 high-strength CFS built-up compression members through experimental and numerical investigations. Different built-up sections, such as open-lipped built-up sections (OL series) and closed-unlipped built-up sections (CU series), composed of various section sizes and screw spacings, were studied. These proposed parameters assessed the influence of the member slenderness and section slenderness on the CFS built-up sections with thin-walled profiles. The results demonstrated that the cyclic actions have little influence on the structural performance of the CFS built-up sections at the pre-peak stage. At the post-peak stage, a faster degradation in strength and stiffness was observed for specimens with greater member slenderness and section slenderness. Moreover, the increase in section slenderness leads to higher axial ductility for the CU series but minimal influence on the OL series. Furthermore, a greater member slenderness leads to smaller energy dissipation capacity, especially for the specimens with smaller section slenderness. The OL series is recommended to be designed as a strength-control element that provides structural stability and integrity, such as primary columns. In contrast, the CU series can be used as the sacrificial element to dissipate energy, such as lateral bracing in the framing system, to minimise the risk of catastrophic collapse subject to extreme loadings such as typhoons or earthquakes.
Seismic Performance of Damaged Steel-Concrete Shear Wall with Prestressed Diagonal Bracing Repaired by CFRP Strips
Jian-Gui Qin, Jie Tian, Yi-Xin Mai, Kai Qian, Xiao-Fang Deng
doi:10.1016/j.tws.2025.113234
CFRP条修复预应力斜撑钢-混凝土剪力墙的抗震性能
To investigate the seismic performance of damaged steel-concrete shear wall with prestressed diagonal bracing repaired by Carbon Fiber Reinforced Polymer (CFRP) strips. Three steel-concrete shear walls with diagonal bracing seriously damaged by low reversed cyclic loading were repaired by replacing damaged concrete, repairing diagonal bracing, restoring buckled reinforcements, and wrapping walls with CFRP strips. The seismic performance of the repaired specimens was evaluated using the same quasi-static test as for the original specimens. The seismic performance including the failure modes, deformation capacity, bearing capacity, energy dissipation, stiffness degradation, and bearing capacity degradation of the repaired specimens were researched in the study. Experimental results show that the used repair schemes effectively restore specimens’ bearing capacity, ductility, and energy dissipation, as well as enhancing deformation capacity. Applying an "X"-shaped CFRP repair scheme which aligned with the direction of the bracing can effectively compensates for the reductions of stiffness and bearing capacity due to cyclic loading. Compared to shear wall with smooth steel tubes as diagonal bracing, those with threaded reinforcements create a stronger mechanical interlocking effect between the bracing and concrete. This enhanced synergy interaction increases the effective shear resistance section in the midsection of the wall panel, thereby forming a more efficient diagonal load transfer mechanism. Therefore, shear damage can be avoided in the middle of the wall limb. Additionally, the study presents the theoretical calculation model for the original and the repaired shear walls, and the comparison of the calculation results with test results demonstrates that the calculation model has high computational accuracy.
Data orbits similarity conversion law of scaled-down model tests of ship structures under strong impact loads
Xiongliang Yao, Renjie Huang, Kun Zhao, Yongran Yin
doi:10.1016/j.tws.2025.113235
强冲击载荷下船舶结构缩比模型试验数据轨道相似转换规律
The model test under strong impact loads constitutes a transient, strongly nonlinear, and non-stationary physical process that exhibits extreme sensitivity to system parameters, boundary conditions, and initial conditions. A minor perturbation induces bifurcation and abrupt changes in system dynamics, resulting in output uncertainty for model tests and significant challenges in achieving similarity conversion between models and prototypes. In this paper, the second law of similarity is applied to construct data orbits of impact responses for characterizing kinematic system evolution, and a principle of topologically conjugate conversion for similar systems in phase space is proposed. Through phase space reconstruction methodology, the kinematic evolution patterns of acceleration responses in ship structures under strong impact loads are investigated, with mapping functions of acceleration response data orbits derived in phase space. A similarity equation for model-to-prototype conversion is established based on the topologically conjugate conversion principle. Theoretical analysis demonstrates the rationality of introducing prediction coefficients in distortion models, while fundamental conditions for achieving similarity conversion in nonlinear dynamical systems are formulated. Finally, the numerical results from the single-layer reinforced plate rack and cabin section show that the data orbits corresponding to the acceleration responses of the 1:2 scaled model and the prototype have the same symbol sequences in the phase space under satisfying the similarity conversion condition, which verifies the correctness of the similarity conversion of data orbits for the scaling model test of the ship structures under the strong impact loads.
Nonlinear buckling and post-buckling of multilayered piezoelectric graded porous circular nanoplates considering of surface/interface effects
Qinglu Li, Xiaojie Niu, Zhaoyi Pan, Jinghua Zhang
doi:10.1016/j.tws.2025.113236
考虑表面/界面效应的多层压电梯度多孔圆形纳米板的非线性屈曲和后屈曲
The special characteristics of surfaces and interfaces significantly influence the durability and performance of materials. For the first time, this article introduces surface and interface effects into Kirchhoff thin plate theory to study the buckling and nonlinear post-buckling behavior of multilayer piezoelectric porous nanostructures. The bulk structure is a graded porous material and pores are embedded in the plate in two cosine forms of non-uniform porosity distribution with a pair of piezoelectric layers surface bonded on both sides of the bulk surface. Then, classical plate theory, combined with minimum potential energy principle, is utilized to derive the post-buckling governing equation coupling the piezoelectric effect. A shooting method is presented to obtain the buckling and post-buckling numerical solutions. The numerical results obtained reveal that the surface and interface effects, along with the applied potential, significantly influence the stability of multilayer piezoelectric graded porous circular nanoplates to varying extents.
