Article
Engineering, Civil
Renaud Franssen, Serhan Guner, Luc Courard, Boyan I. Mihaylov
Summary: The study proposes a numerical material modeling approach for the nonlinear finite element analysis of UHPFRC to simulate both shear- and flexure-critical members made from strain-softening or -hardening UHPFRC. The approach aims to capture the unique behavior of UHPFRC using a comprehensive set of crack spacing formulations and modeling recommendations. When applied to experimental data, the proposed modeling approach accurately predicts the strength ratios with a low coefficient of variation.
ENGINEERING STRUCTURES
(2021)
Article
Polymer Science
Weiqin Tang, Dayong Li, Yinghong Peng, Peidong Wu
Summary: The study investigates the mechanism of shear band formation and evolution in amorphous glassy polymers, and finds that the initiation and propagation of shear bands are caused by intrinsic strain softening. Shear bands form and propagate during forward shearing, but gradually disappear during reverse shearing. Furthermore, shear bands cannot be recovered through reverse straining during plastic deformation.
Article
Engineering, Geological
Zongxing Zou, Rui Mu, Yinfeng Luo, Bing Guo, Lei Tan, Aijun Su, Chunyan Tang
Summary: This study proposes a progressive evaluation method for buckling landslide stability considering the shear mechanical characteristics of the slip zone. The proposed method was validated with a case study, showing good agreement between the evaluation result and observation.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Tianyi Zhao, Yue Zhao, Zhandong Wan, Pengcheng Shang, Aiping Wu, Quan Li, Dongyang Yan
Summary: The prediction of welding residual stresses (WRS) can be inaccurate if the mechanical property model of the material is inaccurate in the finite element model. In this study, the influence of temperature, working hardening, and anneal softening on the mechanical properties of TIG welded 2219-T8 aluminum alloy was investigated. Tensile properties were obtained using the Gleeble and DIC system, and working hardening and anneal softening were studied through tensile curves. A refined mechanical property model was then built for welding simulation. The results showed that anneal temperature had a significant influence on the longitudinal residual stress (LRS) in certain regions, and correct consideration of anneal softening led to lower LRS and reduced yield strength in these regions, while regions with lower maximum temperature were less affected by anneal softening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Ocean
Run Liu, Yu Yuan, Dengfeng Fu, Guodong Sun
Summary: The effect of cyclic loading on the bearing capacity of offshore foundations is a significant problem in geotechnical design. This paper proposes a soil model combining isotropic and kinematic hardening, and investigates the cyclic loading effect on the capacity of embedded circular foundations. The model's reliability and the strain softening mechanism of clayey soil are examined, and the post-cyclic capacities are evaluated. The effect of vertical loading magnitude on cyclic loading capacities is also considered.
APPLIED OCEAN RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Robert Keqi Luo
Summary: The effective shear strain Yt criterion was developed to evaluate fatigue damage in rubber components. The relation between the Yt criterion and the existing effective tensile strain et criterion was revealed. Six damage criteria, including maximum principal strain, stress, and strain energy density, were compared using cylindrical dumbbell samples under different fatigue cases. The proposed criteria were successfully validated and found to be useful for predicting crack orientation and for antivibration product design.
MECHANICS OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yinfeng Luo, Zongxing Zou, Changdong Li, Haojie Duan, Nang Mon Mon Thaw, Bocheng Zhang, Bingdong Ding, Junrong Zhang
Summary: This study investigates the shear constitutive model of slip zone soil and finds that the Gamma distribution function is the optimal model for describing the shear damage evolution process of slip zone soil.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Composites
Lei Zhang, Hanyu Zhang, Zhao Liu, Ping Zhu
Summary: This study aims to obtain a refined strain-softening model (SSM) for carbon fiber reinforced polymer (CFRP) composites and apply it to the progressive damage analysis (PDA) of corresponding components. A novel cyclic-loading-based strain-softening model (CLSSM) was proposed based on the theory of equivalent dissipation energy. The results show that CLSSM effectively simulates the progressive failure process of CFRP components.
POLYMER COMPOSITES
(2022)
Article
Engineering, Multidisciplinary
Wei-Li Song, Quan Ma, QingLei Zeng, ShengXin Zhu, MingBin Sui, TangQing Cao, Wei Qi, YinQiang Chen, XiaoQi Yu, YunFei Xue, Hao-Sen Chen
Summary: This study investigates the mechanism of dynamic shear banding in a BCC HEA HfNbZrTi, and finds that in this material, dynamic shear banding is primarily controlled by damage softening, with thermal softening playing a secondary role.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Maximilian Koehler, Daniel Balzani
Summary: A new relaxation approach is proposed to describe stress and strain softening at finite strains. The model constructs a convex hull to represent damage, allowing for the homogenization of a microstructure bifurcated in weakly and strongly damaged phases. The strongly damaged phase is allowed to elastically unload and its volume fraction increases within the convexified regime, enabling strain-softening. The proposed approach ensures mesh-independent structural simulations without additional length-scale parameters or nonlocal quantities.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Optics
Haohao Zeng, Xiangtao Hu, Dong Yang
Summary: Laser-assisted milling (LAM) is a promising method for machining hard-to-cut materials. This study presents an analytical model to predict the residual stress distribution in the LAM process. The model considers the material softening behavior caused by laser heating and its effect on distributed loads and mechanical stresses. LAM experiments are performed to verify the model, and the findings suggest a moderate feed rate for higher surface compressive residual stresses.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Suleiman M. BaniHani, Faris M. AL-Oqla, Mohammad Hayajneh, Samer Mutawe, Thakir Almomani
Summary: A new approach for modeling cracks in the element free Galerkin method is introduced in this study. It utilizes a discrete crack model and the visibility method to accurately predict crack behavior with minimal computational effort.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Ocean
Shujin Zhou, Mi Zhou, Yinghui Tian, Xihong Zhang
Summary: In this study, a numerical model is established to investigate the soil flow mechanism of caissons with pad-eye stiffeners. The soil strain softening effect is considered. The study finds that the soil failure mechanisms and penetration resistances of locally stiffened caissons at the pad-eye are significantly different from unstiffened caissons or caissons with interval rings. A simplified flow mechanism is proposed and approximating expressions are derived for predicting the penetration resistance of the caisson.
APPLIED OCEAN RESEARCH
(2022)
Article
Computer Science, Interdisciplinary Applications
Chunlei Li, Long Yu, Xianjing Kong, Heyue Zhang
Summary: This study simulated the continuous penetration of a spherical penetrometer (ball) into softening and rate-dependent soil, revealing three stages from shallow failure mechanism to deep flow-round mechanism. The effects of strain rate and softening parameters on the failure mechanism and the evolved bearing factor profile were investigated. The dimensionless soil strength sum /gamma ' D and the frictional condition of the soil-ball interface were explored as well. Empirical formulas were developed to estimate the critical depths of the ball penetration test. A practical interpretation framework, incorporating the effects of strain rate and softening, was developed to assess the soil undrained shear strength using the ball penetrometer.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Construction & Building Technology
Victor Zolotarev
Summary: The text discusses the temperature-rheological behavior of bitumen, pointing out the relationship between penetration values and shear stress, and proposes a method to convert penetration into shear stress. The research indicates that there is a certain regularity in the shear stress of bitumen at different penetration values.
CONSTRUCTION AND BUILDING MATERIALS
(2022)