Article
Materials Science, Multidisciplinary
Cedric Gourdin, Gregory Perez, Hager Dhahri, Laurent De Baglion, Jean-Christophe Le Roux
Summary: This paper introduces a new device, FABIME2e, developed for quantifying the effect of a PWR environment on disk specimens, combining structural effects and environmental penalty effects.
Article
Engineering, Mechanical
Amit Vikram Rex, Surajit Kumar Paul, Akhilendra Singh
Summary: The present study investigates the impact of different tensile pre-straining on the mechanical properties and fatigue life of AA2024-T4. Pre-strained specimens exhibit increased ultimate tensile strength and yield stress, reduced ductility, and a significant enhancement in fatigue performance.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Markus Haertel, Christian Illgen, Tobias Panzner, Enrico Bruder, Stefan Schmaltz, Steven Van Petegem, Kai Willner, Karsten Durst, Helena van Swygenhoven, Martin F. -X. Wagner
Summary: This research investigates the Bauschinger effects in sheet metal DC06 under equi-biaxial loading conditions. The results show that the material exhibits distinct Bauschinger effects when subjected to equi-biaxial load path changes, which differ from similar observations under uniaxial loading. These effects can be explained by considering the evolution of dislocation densities and the formation of substructures, as well as the influence of residual stresses.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
M. J. Cordill, P. Kreiml, B. Putz, C. Mitterer, D. Thiaudiere, C. Mocuta, P-O Renault, D. Faurie
Summary: This study investigates thin film architectures consisting of brittle Mo and ductile Al layers on a polyimide substrate, analyzing the effects of layer arrangement on stress and deformation mechanisms. The position of the Mo layer is shown to significantly affect the fracture strain of the bilayers in stretchable applications.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Mechanical
Amit Vikram Rex, Surajit Kumar Paul, Akhilendra Singh
Summary: The low cycle fatigue performance of AA2024-T4 aluminium alloy with different tensile pre-straining histories is investigated. Equi-biaxial tensile pre-strained specimens have the same fatigue life as 0% pre-strained specimens, while all uniaxial tensile pre-strained specimens show improved fatigue life. As-received specimens exhibit noticeable cyclic hardening at all strain amplitudes. Pre-strained specimens have a nearly stable cyclic stress-strain response for each strain amplitude. Electron backscattered diffraction examination reveals large lattice distortion in equi-biaxial tensile pre-strained specimens compared to the other two cases.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
V. Chaves, A. Navarro, L. Susmel, D. Taylor
Summary: This study analyzes several models of multiaxial fatigue for notches, focusing on the interaction between the crack, its associated plastic zone, and the material microstructural barriers. The models are then applied to predict the fatigue limit of a plate with a circular hole under different cyclic loading conditions. The results show that an increase in the hole radius can lead to an increase in the predicted fatigue limit.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Multidisciplinary
Yang Liu, Yawei Qin, Jin-Yong Dong
Summary: The copolymerization of 1,9-decadiene/ethylene is a potential method for producing long chain-branched polyethylene using Ziegler-Natta catalysts. However, increasing the feed of 1,9-decadiene may result in gelation of the polymer.
Article
Materials Science, Multidisciplinary
A. Greco, E. Sgambitterra, F. Furgiuele, D. Furfari
Summary: This study aims to develop a hybrid procedure for measuring equi-biaxial residual stresses using finite element simulations and experimental analyses. By combining nanoindentation experiments with finite element analyses, the non-linear relationship between residual stresses and peak load variation is better understood. The proposed method offers an improved correlation between residual stresses and peak load variation, and a more accurate assessment of residual stresses can be achieved by integrating nanoindentation experiments and finite element analyses.
EXPERIMENTAL MECHANICS
(2023)
Article
Engineering, Chemical
Renchu He, Keshuai Ju, Linlin Li, Jian Long
Summary: In this paper, a multi-objective collaborative optimization strategy is proposed for decision-making in a distillation column group. The operating modes of the tower group are determined using the fuzzy C-means clustering method, and a discrete state-space model is constructed for the main towers. A MOCO optimization model is designed for the ethylene plant, and NSGA-III is used to solve the optimization problem. The results are compared with historical data, and an appealing operation area is obtained.
Article
Polymer Science
Feng-Yang Wu, Sheng Yang, Hao Lin, Jun Lei, Ling Xu, Li Zhou, Kun Dai, Gan-Ji Zhong, Zhong-Ming Li
Summary: The structural evolution of propylene-ethylene copolymer (coPP) and propylene-ethylene copolymer/polypropylene (coPP/iPP) films during a tensile process was studied. Both types of films showed melt-recrystallization during deformation. At low strain rate, molecular chains were easier to pull from the lattice, resulting in decreased crystallinity in the films. Interestingly, there was a difference in the growth process for lamellae between coPP and coPP/iPP samples.
Article
Polymer Science
Traian Zaharescu
Summary: This paper investigates the stabilization effects of kelp extract on an engineering elastomer, EPR, which may be used for packaging. The results show that the addition of kelp extract increases the oxidation induction time and raises the onset oxidation temperatures of the thermally aged and gamma-irradiated EPR samples. The stabilization effect is attributed to the activity of alginic acid, one of the main active components in kelp extract. The presence of kelp extract slows down the accelerated degradation caused by gamma-exposure.
Article
Mechanics
Tong Liang, Weike Yuan, Gangfeng Wang
Summary: This study used the finite element method to simulate the indentation of pre-stressed strain hardening materials by a rigid sphere, revealing the influence of residual stress on contact pressure. A nominal contact pressure was defined to quantify the effect of residual stress, and a new method for measuring residual stress through spherical indentation tests was proposed based on the nominal pressure deviation caused by residual stress.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2021)
Article
Engineering, Mechanical
V. Chaves, J. A. Balbin, A. Navarro, L. Susmel, D. Taylor
Summary: This study used different models to predict the fatigue limit in notched components under biaxial cyclic loading. The predictions of these models are based on elastic stresses along a representative crack direction. The experimental crack direction is unique, but the modeled directions vary. However, the models still provide good predictions for the experimental fatigue limits, showing surprising insensitivity to their own assumptions.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Electrical & Electronic
Shaojun Song, Junfeng Jing, Wei Cheng
Summary: Glass fiber-based composites are widely used due to their excellent properties, but they are prone to fatigue-induced deformation damage. Existing monitoring methods are not suitable for industrial production. This article proposes a machine vision-based online monitoring system that can identify fatigue deformation in real-time. The system has a high deformation accuracy and a low false alarm rate, as confirmed by on-site testing and evaluation.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Chemistry, Physical
Yueyang Han, Lingyin Du, Yuan Zhu, Youhao Xu, Xuhui Bai, Ying Ouyang, Yibin Luo, Xingtian Shu
Summary: The research investigated the effects of reaction conditions on the yield of ethylene and propylene from pentene cracking. The maximum total yield of ethylene and propylene was achieved at 700 degrees C and 57 h(-1). A thermal/catalytic cracking proportion model was established to explore the reaction mechanism at high temperatures, revealing that catalytic cracking played a major role in the production of ethylene and propylene. The suitable reaction network for pentene catalytic cracking was deduced and estimated.
