【新文速递】2026年4月27日复合材料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 2 篇，International Journal of Plasticity 2 篇International Journal of Solids and StructuresNonlinear vibrations from local shell buckling in composite tape spring hingesSaad Shabeer, Alex Kopetz, Derek Geiger, Andrew J. Leedoi:10.1016/j.ijsolstr.2026.114031复合胶带弹簧铰链局部壳屈曲引起的非线性振动The nonlinear steady-state responses for a thin-shelled composite tape spring hinge under translational base harmonic excitation are characterized both experimentally and through finite element an alysis. The motivation is to investigate how the nonlinear elastic deformation modes associated with pre-buckled and post-buckled stability regimes manifest into dynamic responses when a tape spring shell is subject to large amplitude vibrations. The first two linear vibration modes are found to be a twisting mode and a bending mode in both high-speed digital image correlation tests and finite element an alysis. Forwardc and backward frequency sweeps across the dominant bending mode are then experimentally conducted with a shaker setup and through nonlinear dynamic implicit simulations in Abaqus. The hinge structure is found to exhibit broadband nonlinear steady-state responses consisting of flexural–torsional, subharmonic, superharmonic, and chaotic oscillations as well as intermittencies. There is correlation between the experimental and simulation results in terms of the steady-state amplitudes and frequency content, nonlinear bandwidths, and response type. A detailed characterization is made for each observed response by visualizing both global and local deformations for the tape spring hinge.通过实验和有限元分析，研究了平动基谐激励下薄壳复合材料带状弹簧铰链的非线性稳态响应。研究的动机是研究当带式弹簧壳受到大振幅振动时，与预屈曲和后屈曲稳定机制相关的非线性弹性变形模式如何表现为动态响应。通过高速数字图像相关试验和有限元分析，发现其前两种线性振动模态分别为扭转模态和弯曲模态。在Abaqus中进行了非线性动态隐式模拟，并利用激振器对主弯曲模态进行了前向和后向频率扫描。发现铰链结构表现出宽带非线性稳态响应，包括弯曲-扭转，亚谐波，超谐波和混沌振荡以及间歇性。在稳态幅值和频率含量、非线性带宽和响应类型方面，实验结果与仿真结果之间存在相关性。通过可视化磁带弹簧铰链的全局和局部变形，对每个观察到的响应进行了详细的表征。Journal of the Mechanics and Physics of SolidsPolymer Necking Revisited: A Route to a New Oriented Material State in Poly(ethylene terephthalate)Danqi Sun, Christos E Athanasioudoi:10.1016/j.jmps.2026.106649聚合物颈缩：聚对苯二甲酸乙酯通向新取向材料状态的途径Necking in thermoplastic polymers is often viewed as a failure-related instability. In conventional tensile tests, once a neck forms, most additional deformation occurs through neck propagation rather than straining of the necked material, which obscures the intrinsic post-yield response. Here we show that stable neck propagation under an in-plane plane-strain constraint in a widely used commercial polymer film, poly(ethylene terephthalate) (PET), acts as a mechanical transformation that can create a new highly oriented material state. Under certain loading conditions, this state exhibits exceptional specific strength and strain rate insensitivity. PET films were stretched under conditions that promote steady neck propagation. Specimens were then excised from the necked zone and reloaded along directions parallel and transverse to the draw to decouple neck formation from post-neck deformation. The necked film exhibits strong anisotropy: along the draw direction, the elastic modulus increases from 1.67 GPa to 4.55 GPa, and the yield stress more than doubles, while transverse specimens display reduced yield stress and secondary necking. Although the parent material exhibits pronounced rate dependence in yielding and neck initiation, the draw-direction response of the necked state is nearly rate-independent over strain rates from 10 − 5 to 10 − 3 / s , and remains rate-insensitive under cyclic loading. These findings recast necking from an instability into a route for creating rate-insensitive, high-specific-strength polymer states and provide a compact experimental benchmark for constitutive models coupling localization, anisotropy evolution, and rate sensitivity.热塑性聚合物中的颈缩通常被视为与失效相关的不稳定性。在常规的拉伸试验中，一旦颈部形成，大多数附加变形都是通过颈部扩展而不是颈部材料的应变发生的，这掩盖了固有的屈服后响应。本研究表明，在广泛使用的商用聚合物薄膜——聚对苯二甲酸乙酯（PET）中，在平面内平面应变约束下，稳定的颈部传播作为一种机械转变，可以创造一种新的高度定向的材料状态。在一定的加载条件下，这种状态表现出特殊的比强度和应变速率不敏感。PET薄膜在促进颈部稳定扩展的条件下拉伸。然后从颈部区域切除标本，沿平行和横向方向重新加载，以使颈部形成与颈部后变形脱钩。颈缩膜表现出较强的各向异性：沿拉伸方向，弹性模量从1.67 GPa增加到4.55 GPa，屈服应力增加一倍以上，而横向试样则表现出屈服应力降低和二次颈缩。尽管母材在屈服和颈状萌生过程中表现出明显的速率依赖性，但颈状状态的拉伸方向响应在10−5 ~ 10−3 / s的应变速率范围内几乎与速率无关，并且在循环加载下保持速率不敏感。这些发现将颈缩从不稳定性转变为一种创建速率不敏感、高比强度聚合物状态的途径，并为本构模型耦合定位、各向异性演化和速率敏感性提供了一个紧凑的实验基准。Latent-Lagrangian Neural Networks for Reduced Order Modeling of Non-autonomous Nonlinear Dynamical SystemsAnand Kumar Agrawal, Anders Thorindoi:10.1016/j.jmps.2026.106633非自治非线性动力系统的隐-拉格朗日神经网络降阶建模This work proposes a latent Lagrangian-based framework for reduced-order modelling of forced nonlinear dynamical systems. In contrast with conventional Lagrangian or Hamiltonian neural networks, our approach learns a set of latent coordinates sufficient to capture the dynamics conjointly with two neural networks for the latent kinetic and latent potential energies, and leverages force supervision to eliminate the need for an ODE solver during training. Consistency of physical laws in the latent space is ensured through the principle of virtual work. Results show that the model effectively learns the subtle dynamics induced by the system’s nonlinearity and non-convex potential energy, and generalizes well to unseen forces and initial conditions. These observations confirm the physical relevance of the proposed approach, and its interest for model reduction.这项工作提出了一个基于潜在拉格朗日的框架，用于强制非线性动力系统的降阶建模。与传统的拉格朗日或哈密顿神经网络相比，我们的方法学习了一组足以捕获动态的潜在坐标，并结合两个神经网络来获取潜在的动能和潜在的势能，并利用力监督来消除训练过程中对ODE求解器的需要。虚功原理保证了隐空间物理规律的一致性。结果表明，该模型能有效地学习由系统非线性和非凸势能引起的细微动力学，并能很好地推广到不可见的力和初始条件。这些观察结果证实了所提出的方法的物理相关性，以及它对模型简化的兴趣。International Journal of PlasticityThe effect of trace Fe on the mechanical properties and microstructure evolution of CP-TiJiajun Hu, Dongmei Zhang, Xiaohuan Liu, Shuaizhuo Wang, Yi Liu, Lirong Xiao, Bo Gao, Dongdi Yin, Hao Zhou, Yonghao Zhaodoi:10.1016/j.ijplas.2026.104706微量铁对CP-Ti力学性能及微观组织演变的影响Conventional perspectives have often considered the influence of trace Fe impurities in commercial purity titanium (CP-Ti) to be minimal. This study, however, demonstrates that even at low concentrations, Fe plays a critical role in regulating microstructural evolution and mechanical performance. Comparative an alysis of three alloy systems—pure Ti, Ti-0.3O, and Ti-0.3O-0.2Fe—processed under identical conditions revealed that trace Fe additions significantly enhance grain refinement during plastic deformation. Following the same thermomechanical processing, the average grain size in the nanocrystalline region of the Ti-0.3O-0.2Fe sample was refined to approximately 33 nm. Subsequent annealing further highlighted the distinct role of Fe: samples containing Fe exhibited markedly inhibited recrystallization behavior and a substantially increased recrystallization activation energy, underscoring its key contribution to thermal stability. The underlying mechanis m was elucidated through atom probe tomography, which revealed multi-scale segregation of Fe at grain boundaries and dislocation structures. This segregation exerts a strong pinning effect, effectively hindering boundary migration and dislocation recovery, thereby providing a fundamental explanation for the enhanced thermal stability. While the direct solid solution strengthening from Fe is limited, it notably improves the work hardening capacity. In coarse-grained microstructures, Fe segregation at grain boundaries can reduce ductility. Conversely, in refined microstructures, the work-hardening capability is further improved, resulting in a concurrent increase in both strength and ductility. This study elucidates by which trace Fe regulates microstructural evolution in CP-Ti, thereby establishing a theoretical foundation for designing alloys with enhanced microstructural stability and superior mechanical properties.传统观点通常认为痕量铁杂质对商业纯钛（CP-Ti）的影响很小。然而，这项研究表明，即使在低浓度下，铁在调节微观结构演变和力学性能方面也起着关键作用。在相同条件下加工的纯Ti、Ti-0.3 o和Ti-0.3 o -0.2Fe三种合金体系的对比分析表明，微量Fe的加入显著提高了塑性变形过程中的晶粒细化程度。经过相同的热处理，Ti-0.3O-0.2Fe样品的纳米晶区平均晶粒尺寸细化到约33 nm。随后的退火进一步突出了铁的独特作用：含铁的样品表现出明显抑制再结晶行为和显著增加的再结晶活化能，强调其对热稳定性的关键贡献。原子探针层析成像揭示了铁在晶界和位错结构处的多尺度偏析。这种偏析产生了强烈的钉住效应，有效地阻碍了边界迁移和位错恢复，从而为热稳定性的增强提供了基本的解释。铁的直接固溶强化作用有限，但显著提高了加工硬化能力。在粗晶组织中，晶界处的铁偏析会降低延展性。相反，在细化的组织中，加工硬化能力进一步提高，导致强度和塑性同时提高。本研究阐明了微量铁对CP-Ti合金微观组织演化的调控作用，为设计组织稳定性强、力学性能优越的合金奠定了理论基础。High-Ti induced planar-fault transformation toward superlattice extrinsic stacking faults and microtwins in crept CoNi-based superalloysZhida Liang, Xiang Xu, Fengxian Liu, Xi Zhang, Xin Liu, Mingyang Zhang, Li Wang, Jing Zhang, Florian Pyczak, Yinan Cuidoi:10.1016/j.ijplas.2026.104705蠕变镍基高温合金中高钛诱导平面错误向超晶格外层错误和微孪晶转变Controlling planar fault shearing modes is key for improving the high-temperature creep performance of γ′-strengthened superalloys. This work investigates the effect of Ti concentration on planar fault shearing modes during creep in L1₂-strengthened CoNi-based superalloys. Interrupted compressive creep tests were conducted at 1223 K under low applied stress and at 1123 K under high applied stress. We found, for the first time, that high Ti additions shift the dominant γ′ shearing mode from antiphase boundaries (APBs) in Ti-free and low-Ti alloys to superlattice extrinsic stacking faults (SESFs). Systematic ab initio calculations show that in high-Ti alloys, the elevated APB energy renders APB-shearing mode unfavorable. Nevertheless, the SESF energy decreases relative to that in low-Ti compositions, and an increased ratio of complex intrinsic stacking fault (CISF) to SESF energy promotes the transformation of high-energy CISFs into lower-energy SESFs. Chemical an alysis using scanning trans mission electron microscopy combined with energy-dispersive X-ray spectroscopy further reveals that, SESFs in high-Ti alloys are enriched in Ti, Mo and W, yet no grid-like ordering is observed. Combined with the ab initio calculations, the results suggest that Mo and W additions facilitate the transformation from the L1₂ structure to the lower-energy D0₂₄ structure. This indicates that Mo and W segregation along SESFs is energetically favourable. Furthermore, the successive SESF thickening facilitates microtwinning in the absence of D024 ordering along SESFs, as an additional major carrier for creep strain. These new findings clarify the role of Ti in controlling planar fault shearing modes, providing new insights for optimizing the creep performance of next-generation CoNi-based superalloys.控制平面断层剪切模式是改善γ′强化高温合金高温蠕变性能的关键。本文研究了Ti浓度对L1₂强化镍基高温合金蠕变过程中平面断层剪切模式的影响。在1223 K低外加应力和1123 K高外加应力条件下进行了间断压缩蠕变试验。我们首次发现，高Ti添加量将无Ti和低Ti合金中的主要γ′剪切模式从反相边界（APBs）转变为超晶格外源层错（sesf）。系统从头计算表明，在高ti合金中，APB能量的升高不利于APB剪切模式。然而，相对于低ti成分，SESF能量降低，复杂本征层错（CISF）与SESF能量之比的增加促进了高能CISF向低能SESF的转变。利用扫描透射电子显微镜结合能量色散x射线能谱进一步分析表明，高Ti合金的SESFs富集Ti、Mo和W，但未观察到网格状有序结构。结合从头计算，结果表明Mo和W的加入促进了L1₂结构向低能D0₂₄结构的转变。这表明Mo和W沿sesf的偏析在能量上是有利的。此外，连续的SESF增厚有助于在没有D024沿SESF排序的情况下微孪晶，作为蠕变应变的额外主要载体。这些新发现阐明了Ti在控制平面断层剪切模式中的作用，为优化下一代镍基高温合金的蠕变性能提供了新的见解。来源：复合材料力学仿真Composites FEM