【新文速递】2026年5月8日复合材料SCI期刊最新文章

今日更新：International Journal of Solids and Structures 2 篇，International Journal of Plasticity 1 篇International Journal of Solids and StructuresPrediction of USP-induced gradient nanostructuring: A novel DEM-FEM coupling approach using probability distribution functionXingjian Dong, Cheng Wang, Xinrong Tao, Shuyi Yang, Wentao Zhou, Shuai Gao, Huayan Pu, Jun Luodoi:10.1016/j.ijsolstr.2026.114032 usp诱导的梯度纳米结构预测：一种基于概率分布函数的DEM-FEM耦合方法Ultrasonic shot peening (USP) is an effective surface severe plastic deformation (SPD) technique for fabricating gradient nanostructured (GNS) materials. However, predicting the resultant gradient nanostructure remains challenging owing to the inherent randomness of multi-shot impacts. This study proposes a novel probability distribution function (PDF)-based coupling approach that integrates the discrete element method (DEM) and finite element method (FEM) to simulate the USP process and predict the gradient nanostructure in pure copper. The DEM simulation was initially validated against single-shot impact experiments, confirming its accuracy in capturing shot dynamics under ultrasonic excitation. Subsequently, the positions and velocities of multiple shots impacting the specimen, derived from DEM simulations, were statistically characterized using PDFs. These PDFs were incorporated into the FEM to construct a realistic finite element model. A physics-based constitutive model, which accounts for thermal activation, dislocation density evolution, the Hall–Petch effect, and dislocation drag, was implemented within this framework. The coupled model successfully predicted depth-dependent distributions of equivalent plastic strain, dislocation density, and dislocation cell size. The predicted gradient in dislocation density exhibited a direct correlation with microhardness profiles, showing good agreement with experimental measurements. Finally, the validated model was employed to systematically investigate the influences of key USP parameters, including ultrasonic vibration amplitude, shot diameter, USP time, and USP height, on the resultant gradient nanostructure. The proposed PDF-based DEM-FEM method provides an efficient and accurate numerical tool for optimizing USP processes aimed at fabricating gradient-nanostructured metallic materials.超声喷丸技术是制备梯度纳米结构材料的一种有效的表面剧烈塑性变形（SPD）技术。然而，由于多重冲击的随机性，预测最终的梯度纳米结构仍然具有挑战性。本文提出了一种基于概率分布函数（PDF）的耦合方法，将离散元法（DEM）和有限元法（FEM）相结合，模拟纯铜的USP过程并预测其梯度纳米结构。通过单发弹丸冲击实验对DEM模拟进行了初步验证，证实了其在超声激励下捕获弹丸动态的准确性。随后，从DEM模拟中得出的多次射击撞击试样的位置和速度，使用pdf进行统计表征。这些pdf文件被纳入有限元，以建立一个现实的有限元模型。在此框架内实现了基于物理的本构模型，该模型考虑了热激活、位错密度演化、Hall-Petch效应和位错阻力。耦合模型成功地预测了等效塑性应变、位错密度和位错单元尺寸的深度相关分布。预测的位错密度梯度与显微硬度曲线直接相关，与实验结果吻合良好。最后，利用验证模型系统地研究了超声振动振幅、射丸直径、超声脉冲时间和超声脉冲高度等关键超声脉冲参数对所得梯度纳米结构的影响。本文提出的基于pdf的DEM-FEM方法为优化梯度纳米结构金属材料的USP工艺提供了一种高效、准确的数值工具。Consistent treatment of ageing-time evolution in McCormick type material modelsLars Rose, Andreas Menzeldoi:10.1016/j.ijsolstr.2026.114030麦考密克型材料模型老化时间演化的一致性处理This work enhances conventional constitutive models for dynamic strain ageing (DSA) based on McCormick’s ageing-time evolution, which incorrectly predicts continuous hardening even within loading stages without plastic flow. An adapted evolution equation is proposed that ties ageing-time progression to the yield surface, ensuring that DSA develops only when dislocations are energetically inclined to glide. To implement such a model consistently, the classical predictor–corrector scheme is revised, and two alternative return-mapping algorithms are established to ensure robust classification of elastic, pseudo-elastic, and plastic states. Numerical examples and experimental data demonstrate that both approaches maintain the predictive capability of the original model while ensuring a consistent and physically meaningful evolution of internal variables.这项工作改进了基于McCormick时效时间演变的动态应变老化（DSA）的传统本构模型，该模型错误地预测了即使在没有塑性流动的加载阶段也会出现连续硬化。提出了一个适应的进化方程，将老化时间进程与屈服面联系起来，确保只有当位错能量倾向于滑动时，DSA才会发展。为了实现该模型的一致性，对经典的预测校正方案进行了修正，并建立了两种可选的返回映射算法，以确保弹性、伪弹性和塑性状态的鲁棒分类。数值算例和实验数据表明，这两种方法都保持了原始模型的预测能力，同时确保了内部变量的一致和物理上有意义的演变。International Journal of PlasticityMicrostructure sensitive fatigue life prediction and size effects in notched specimens: application to Ni-based superalloy GH4169Jin-Chao He, Gabriel Zarzoso, Xing Song, Shun-Peng Zhu, Javier Seguradodoi:10.1016/j.ijplas.2026.104713缺口试样的显微组织敏感疲劳寿命预测及尺寸效应：在ni基高温合金GH4169中的应用Fatigue behavior of Ni-based superalloy GH4169 is significantly influenced by the microstructural characteristics and the presence of notches. In this study, a statistically based microstructure sensitive multiscale modelling framework is developed to an alyze the fatigue behavior of Ni-based superalloy GH4169 notched components. At the macroscale, notched specimens are simulated with the FE method under applied stress range using the Chaboche cyclic plastic model. At the microscale, the local strain range tensor on the notch tip is used as input of FFT-based homogenization with the crystal plasticity model, allowing to capture the grain-level mechanical response under cyclic loading. Fatigue life prediction is done at the microlevel using the FIPs extracted from the CP-FFT simulation. To explore the probabilistic dispersion of fatigue failure, FIPs obtained from multiple microstructural realizations are an alyzed using Gumbel distribution and statistical assess ments are conducted to evaluate fatigue life distribution. Finally, the notch effect associated with variations in the dimensions of the stress-affected zones around the notch is considered. The predicted results are compared with experimental data, demonstrating the reliability of the proposed methodology in estimating the fatigue life of notched specimens in a probabilistic manner.ni基高温合金GH4169的疲劳行为受显微组织特征和缺口存在的显著影响。为了分析ni基高温合金GH4169缺口构件的疲劳行为，建立了基于统计的微结构敏感多尺度建模框架。在宏观尺度上，采用Chaboche循环塑性模型对缺口试件在外加应力范围内进行有限元模拟。在微观尺度上，将缺口尖端的局部应变范围张量作为基于fft的均匀化输入，结合晶体塑性模型，可以捕获循环加载下的晶粒级力学响应。使用从CP-FFT模拟中提取的FIPs在微观层面上进行疲劳寿命预测。为了探索疲劳失效的概率分布，采用Gumbel分布对多个微观组织实现的fip进行了分析，并对疲劳寿命分布进行了统计评估。最后，缺口效应与缺口周围应力影响区尺寸的变化有关。将预测结果与实验数据进行了比较，证明了所提出的方法以概率方式估计缺口试件疲劳寿命的可靠性。来源：复合材料力学仿真Composites FEM