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Simulation Analysis of Mechanical Properties of DC Transmission Lines Under Mountain Fire Condition 山火条件下直流输电线路机械特性的仿真分析
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-19 DOI: 10.1007/s11223-024-00680-2
G. Q. Li, Z. B. Han, H. Zhu, W. Cui, H. D. Zhao, Y. Zheng, L. T. Fan

In the development and construction of the power grid, the transmission line corridor inevitably passes through the area with dense vegetation. Forest fires are common in the dry season, seriously affecting the normal operation of the transmission line. Due to the sharp increase in air temperature and a large amount of smoke during combustion, the steel-core aluminum strand without a sheath is directly exposed to the air of the fire field. Due to the high temperature and adhesion, the structure of the wire changes and the tensile strength decreases accordingly, which can lead to serious damage to the wire, including broken strands and fractures, and it can no longer be used. To solve the problem that it is difficult to assess the operational characteristics of transmission lines after a fire, the mechanical characteristics of transmission lines under forest fire conditions are studied through theory and simulation so that the mechanical characteristics of transmission lines after a forest fire can be quantitatively expressed. It is proposed that a mechanical design manual for conductors under mountain fire conditions be created and the online monitoring system for transmission conductors under mountain fire conditions be improved.

在电网开发建设过程中,输电线路走廊不可避免地要经过植被茂密的区域。旱季森林火灾频发,严重影响输电线路的正常运行。由于空气温度急剧升高,燃烧时产生大量烟雾,没有护套的钢芯铝绞线直接暴露在火场的空气中。由于高温和附着力的作用,导线的结构发生变化,抗拉强度相应降低,会导致导线断股、断裂等严重损坏,无法继续使用。为了解决火灾后输电线路运行特性难以评估的问题,通过理论和仿真研究森林火灾条件下输电线路的力学特性,从而定量表达森林火灾后输电线路的力学特性。建议编制山火条件下导线机械设计手册,完善山火条件下输电导线在线监测系统。
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引用次数: 0
Eulerian Formulation of the Constitutive Relation for an Electro-Magneto-Elastic Material Class 电磁弹性材料类构造关系的欧拉模型
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-18 DOI: 10.1007/s11223-024-00678-w
Deepak Kumar

A novel class of electro-magneto-elastic (EME) materials comprises electro-active and magneto-active particles in the polymer matrix that change their elastic behavior with an applied electromagnetic field. The material response for such a material class is usually formulated using Lagrangian strain tensor and Lagrangian electromagnetic field vectors as “push forward” to the current configuration. This article presents a novel formulation of an electro-magnetoelasticity in terms of an Eulerian strain tensor and Eulerian electromagnetic field vectors referring to the current configuration. Such an Eulerian formulation is often favorable from both theoretical and computational standpoints, which avoids the “push forward” operation to get the current configuration. An exercise to deduce the constitutive relation for an EME material class available in the existing literature from the newly proposed relation is also illustrated.

一类新型的电-磁-弹性(EME)材料由聚合物基体中的电活性和磁活性粒子组成,这些粒子在外加电磁场的作用下会改变其弹性行为。对于这类材料的响应,通常采用拉格朗日应变张量和拉格朗日电磁场矢量来 "向前推动 "当前配置。本文以欧拉应变张量和欧拉电磁场矢量为参考,提出了一种电磁弹性的新表述方法。从理论和计算的角度来看,这种欧拉公式通常是有利的,它避免了为获得当前配置而进行的 "向前推 "操作。此外,还说明了如何根据新提出的关系推导出现有文献中某类 EME 材料的构成关系。
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引用次数: 0
Simulation of Low-Temperature Localized Serrated Deformation of Structural Materials in Liquid Helium Under Different Loading Modes and Potential Energy Accumulation 模拟液氦中结构材料在不同加载模式和势能积累下的低温局部锯齿状变形
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-18 DOI: 10.1007/s11223-024-00668-y
E. V. Vorobyov, T. V. Anpilogova

Numerical results are presented for the low-temperature serrated deformation process in tension induced by a suspended load of 03Kh20N16AG6 austenitic steel and AMg5 aluminum alloy specimens in liquid helium at 4 K. In practice, large loads at cryogenic temperatures are met with liquefied gas tanks, in particular in hydrogen tanks of launch vehicles. The local one-dimensional multiparametric nonlinear mathematical model of the low-temperature serrated metal deformation process was constructed, with its adequate display and quantitative estimates based on mechanical material properties and loading system characteristics. This effect manifests the local thermomechanical metal deformation instability under adiabatic conditions. The mathematical problem was formulated as a nonlinear differential equation of second order with certain initial and other conditions. It represents the dynamic equilibrium of the specimen-loading device system and describes the process of serrated specimen deformation as the system motion. The model is specified for 03Kh20N16AG6 steel and AMg5 aluminum alloy specimens creep-tested in liquid helium. The numerical experiment demonstrated adequate accuracy with the computational method. The qualitative similarity of the process was revealed for the materials of different classes, with the strain levels achieved differing markedly. Comparative computations established that potential energy of the gravitational field induced a much larger localized deformation of the specimen than potential elastic energy, even in combination with additional factors, viz operation of an electric or hydraulic drive, when the deformation rate is two orders of magnitude higher than the standard one for static metal tests in tension. A very large strain arising and localized under slow loading relaxation inevitably fails before the serrated process is complete.

本文给出了 03Kh20N16AG6 奥氏体钢和 AMg5 铝合金试样在 4 K 液氦中悬浮载荷引起的低温锯齿状拉伸变形过程的数值结果。低温锯齿状金属变形过程的局部一维多参数非线性数学模型已经建立,并根据材料的机械性能和加载系统特性进行了充分的显示和定量估算。这种效应体现了绝热条件下局部热机械金属变形的不稳定性。数学问题被表述为一个具有特定初始条件和其他条件的二阶非线性微分方程。它表示试样-加载装置系统的动态平衡,并将锯齿状试样的变形过程描述为系统运动。该模型适用于在液氦中进行蠕变试验的 03Kh20N16AG6 钢和 AMg5 铝合金试样。数值实验证明计算方法具有足够的准确性。不同等级材料的蠕变过程在本质上具有相似性,但达到的应变水平有明显差异。比较计算表明,当变形率比静态金属拉伸试验的标准变形率高出两个数量级时,重力场势能引起的试样局部变形比弹性势能引起的变形大得多,即使结合其他因素(即电动或液压驱动装置的运行)也是如此。在缓慢加载松弛条件下产生的局部大应变不可避免地会在锯齿过程完成之前失效。
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引用次数: 0
Impact Damage Prediction of Carbon Fiber Foam Sandwich Structure Based on the Hashin Failure Criterion 基于哈申失效准则的碳纤维泡沫夹层结构冲击破坏预测
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-18 DOI: 10.1007/s11223-024-00677-x
K. Yang, Y. P. Zhang, Y. Yang, S. D. Ji, J. Wang, Z. Lv

In the process of use and manufacture, carbon fiber foam sandwich structures were often damaged by low-energy impact, resulting in performance degradation. Therefore, it was necessary to study the damage caused by the low-speed impact of composite sandwich structures. Based on the Hashin failure criterion, this paper established an equivalent finite element model of carbon fiber foam sandwich panels under low-velocity impact. The model was used to simulate the damage of the foam sandwich panel with [±45°/±45°/(core)/±45°/±45°] ply structure under the impact energy of 10.58, 21.17, 31.75, and 42.34 J. The simulation results of impact damage depth were compared with the experimental results. The error was less than 10%, which proved the rationality of the impact equivalent model. The model was used to predict and analyze the damage of foam sandwich panels with [±45°/(core)/±45°], [±45°/ (0°, 90°)/(core)/±45°], and [±45°/(0°, 90°)(core)/(0°, 90°)/±45°] ply structures under 21.17J impact energy. The low energy impact resistance was analyzed by comparing and analyzing the damage situation, impact force response time, and impact velocity response time. The results showed that increasing the number of ply layers [±45°] can reduce the impact damage degree and improve the bearing capacity of sandwich panels.

在使用和制造过程中,碳纤维泡沫夹层结构经常受到低能量冲击的破坏,导致性能下降。因此,有必要对复合材料夹层结构的低速冲击破坏进行研究。本文基于 Hashin 失效准则,建立了低速冲击下碳纤维泡沫夹层板的等效有限元模型。利用该模型模拟了[±45°/±45°/(芯材)/±45°/±45°]层结构泡沫夹芯板在 10.58、21.17、31.75 和 42.34 J 冲击能量下的破坏情况。误差小于 10%,证明了冲击等效模型的合理性。该模型用于预测和分析[±45°/(芯材)/±45°]、[±45°/(0°,90°)/(芯材)/±45°]和[±45°/(0°,90°)(芯材)/(0°,90°)/±45°]层结构泡沫夹芯板在 21.17J 冲击能量下的破坏情况。通过比较和分析破坏情况、冲击力响应时间和冲击速度响应时间,分析了低能量抗冲击性能。结果表明,增加[±45°]层数可降低冲击破坏程度,提高夹芯板的承载能力。
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引用次数: 0
Experimental and Numerical Stress-Strain Analyses of Conventional and Intricate Shapes of LCS (1008-AISI) Sheet Metal Under Deep Drawing Operation 深拉操作下 LCS(1008-AISI)板材常规形状和复杂形状的应力-应变实验和数值分析
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-17 DOI: 10.1007/s11223-024-00676-y
K. H. Mukhirmesh, H. Dalfi

The research intends to produce conventional and intricate shapes using a deep drawing operation experimental work and finite element analysis (FEA). So, to perform experiment work, the dies of deep drawing were designed, manufactured, and then employed to produce the mugs of cylindrical and polygonal shapes from low-carbon steel (1008-AISI). In addition, a commercial software program, ANSYS (workbench), was applied to perform the numerical analysis. The research aim is to create conventional (cylindrical) and intricate (polygonal has eight edges) shapes in a deep drawing process and compare the experimental work results and the FEA of both shapes. The comparison saw that with the intricate shapes, the maximum drawing force demanded to create a polygonal mug registered at 39.865 and 33.675 kN with the cylindrical mug. The maximum effective strain registered was 0.4542 with mugs of intricate shapes. Conventional shapes (cylindrical) are easier than the production of intricate shapes (polygonal has eight edges) by employing the deep drawing operation.

该研究旨在利用深拉操作实验工作和有限元分析(FEA)来生产传统和复杂的形状。因此,为了进行实验工作,我们设计、制造了深拉模具,然后用低碳钢(1008-AISI)生产出圆柱形和多边形的杯子。此外,还应用商业软件 ANSYS (workbench) 进行了数值分析。研究目的是在深拉工艺中创建传统形状(圆柱形)和复杂形状(有八个边的多边形),并比较两种形状的实验结果和有限元分析结果。比较结果显示,在复杂形状中,制作多边形马克杯所需的最大拉拔力为 39.865 千牛,而制作圆柱形马克杯所需的最大拉拔力为 33.675 千牛。复杂形状马克杯的最大有效应变为 0.4542。传统形状(圆柱形)比采用拉深操作生产复杂形状(多边形有八个边)更容易。
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引用次数: 0
Influence of Stress Corrosion Cracking on Crack Tip Creep and Crack Propagation Rate in Welded Joints 应力腐蚀开裂对焊接接头裂纹尖端蠕变和裂纹扩展速率的影响
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-17 DOI: 10.1007/s11223-024-00675-z
Y. H. Cui, J. L. Zhang

Crack tip creep is a key parameter affecting the stress corrosion cracking (SCC) growth rate of nickel base alloy structural materials, significantly impacting the stress corrosion cracking rate of austenitic stainless steel and other materials. To explore the variation law of the crack tip creep field at different positions from the weld-seam of the welded joint, a numerical calculation model of the welded joint under different crack initiation positions was established based on alloy 600, and the crack tip stress field and creep were analyzed in detail. Results show that the unevenness of the material will cause obvious stress discontinuity at the crack tip of the material boundary; as the distance between the crack position and the weld interface increases, the stress of the crack tip before creep is affected by the mechanical properties of the base metal decreases. The creep rate of the weld side cracks gradually increases with the distance from the material interface. The minimum crack growth rate appears when the crack is located at the interface between the Ni-based alloy and base metal. The increased distance from the material interface increases the crack growth rate gradually. When the distance from the interface (d>) 0.1mm, the influence of mechanical properties on the growth rate is weakened.

裂纹尖端蠕变是影响镍基合金结构材料应力腐蚀开裂(SCC)增长速率的关键参数,对奥氏体不锈钢等材料的应力腐蚀开裂速率有显著影响。为探索焊接接头焊缝不同位置裂纹尖端蠕变场的变化规律,建立了基于合金 600 的不同裂纹起始位置下焊接接头的数值计算模型,并对裂纹尖端应力场和蠕变进行了详细分析。结果表明,材料的不均匀性会在材料边界的裂纹尖端造成明显的应力不连续;随着裂纹位置与焊接界面之间距离的增加,蠕变前裂纹尖端的应力受母材力学性能的影响减小。焊缝侧裂纹的蠕变速率随着与材料界面距离的增加而逐渐增大。当裂纹位于镍基合金和基体金属的界面时,裂纹增长率最小。与材料界面的距离增加,裂纹生长率也逐渐增加。当与界面的距离(d>)为 0.1mm 时,机械性能对裂纹生长率的影响减弱。
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引用次数: 0
Recrystallization in Welded Joints of Steamers During Long-Term Operation 蒸汽船焊接接头在长期运行过程中的再结晶现象
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-17 DOI: 10.1007/s11223-024-00667-z
V. V. Dmytryk, O. I. Balytskyi, I. V. Kasyanenko, A. V. Glushko, Yu. M. Latynin

It has been established that due to the peculiarities of the recrystallization process, the structure of welded joints of steam lines made of heat-resistant pearlite steels 15Kh1M1F and 12Kh1MF under creep conditions of more than 270 thousand hours undergoes recovery processes. The process of resting with an increasing service life of welded joints accelerates after their service life exceeds 270 thousand hours and begins to transition to recrystallization. During the recrystallization process, individual grain boundaries gradually crumble, which leads to an increase in their size and a change in shape. The speed of recrystallization processes in welded joints’ heat-affected zone (HAZ) differs significantly. The recrystallization processes in the heat-affected zone areas’ structure are more intense compared to the base metal of welded joints that have not been exposed to welding heat. When a common boundary between two contacting grains is crumbled, a single grain is formed, eventually acquiring the same crystallographic orientation. In the area of overheating of the zone of thermal influence of welded joints made of 12Kh1MF steel, the average initial grain size corresponded to the 9th point (DSTU 8972:2019). After 280 thousand hours of operation (about 40 years), it is the 7th. Such processes are accompanied by a decrease in the density of dislocations in a-phase grains and along their boundaries, which does not significantly affect the decrease in mechanical properties. The dependence of the recrystallization on the self-diffusion of alloying elements, the distribution of dislocations in the grains of the a-phase, and the coagulating carbides was established. In this case, the recrystallization process results in a decrease in the mechanical properties of welded joints. Recrystallization in incomplete recrystallization, overheating, and fusion of the filler material is more intense than in the weld metal and the base metal of the welded joints. Recrystallization contributes to damage to welded joints by creep and fatigue mechanisms.

已经证实,由于再结晶过程的特殊性,在蠕变条件下超过 27 万小时的蒸汽管线中,由耐热珠光体钢 15Kh1M1F 和 12Kh1MF 制成的焊接接头结构会经历恢复过程。随着焊接接头使用寿命的增加,其恢复过程在使用寿命超过 27 万小时后会加速,并开始向再结晶过渡。在再结晶过程中,单个晶界逐渐破碎,导致晶界尺寸增大,形状发生变化。焊接接头热影响区(HAZ)中再结晶过程的速度差别很大。与未受焊接热影响的焊点母材相比,热影响区结构中的再结晶过程更为剧烈。当两个接触晶粒之间的共同边界破碎时,就会形成单个晶粒,最终获得相同的结晶取向。在 12Kh1MF 钢焊接接头热影响区的过热区域,平均初始晶粒大小相当于第 9 点(DSTU 8972:2019)。在运行 28 万小时(约 40 年)后,则为第 7 点。伴随着这些过程,a 相晶粒中的位错密度以及沿晶粒边界的位错密度都会降低,但这并不会显著影响机械性能的下降。再结晶与合金元素的自扩散、位错在 a 相晶粒中的分布以及凝固碳化物的关系已经确定。在这种情况下,再结晶过程会导致焊接接头的机械性能下降。与焊接接头的焊缝金属和母材相比,填充材料在不完全再结晶、过热和熔合过程中的再结晶更为强烈。再结晶通过蠕变和疲劳机制导致焊接接头损坏。
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引用次数: 0
Enhancing High-Temperature Fatigue Performance of AA2024-T4 Alloy Through Shot Peening: A Comprehensive Numerical Simulation 通过喷丸强化提高 AA2024-T4 合金的高温疲劳性能:综合数值模拟
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-17 DOI: 10.1007/s11223-024-00674-0
A. H. Alwin, H. Ksibi

This research is part of a series of previous studies aiming to advance technology for aluminum alloys, particularly focusing on AA2024-T4 alloy. The main objective encompassed predicting the fatigue life of a standard specimen under varying experimental conditions associated with the shot peening process. The study delved into forecasting the fatigue life stemming from the cyclic impacts of shots, followed by an endeavor to enhance the specimen’s surface longevity through numerical simulation techniques under varying temperatures, including room and high temperatures. The study predicted the fatigue life resulting from cyclic shot impacts, followed by an attempt to improve the specimen’s surface longevity using numerical simulation techniques under different temperatures, including ambient and elevated temperatures. Interestingly, the research also revealed that static stress becomes apparent after the first 106 cycles, consistent with the results observed in different test cases with different forces applied. Indeed, to guarantee the validity of the results, the interpretations and conclusions drawn have been rigorously validated both at room temperature and at an elevated temperature of 250°C. In summary, this research successfully investigates the numerical analysis of the structure of the AA2024-T4 alloy, providing valuable information on its fatigue behavior at different temperatures.

这项研究是之前一系列研究的一部分,旨在推动铝合金技术的发展,尤其是针对 AA2024-T4 合金的研究。主要目标包括预测标准试样在与喷丸强化工艺相关的不同实验条件下的疲劳寿命。研究深入预测了喷丸循环冲击产生的疲劳寿命,随后通过数值模拟技术努力提高试样在不同温度(包括室温和高温)下的表面寿命。该研究预测了循环弹丸撞击产生的疲劳寿命,然后尝试在不同温度(包括常温和高温)下利用数值模拟技术提高试样的表面寿命。有趣的是,研究还发现,静态应力在最初的 106 次循环后变得明显,这与不同试验案例中施加不同力时观察到的结果一致。事实上,为了保证结果的有效性,所得出的解释和结论在室温和 250°C 高温下都经过了严格验证。总之,这项研究成功地对 AA2024-T4 合金的结构进行了数值分析,为其在不同温度下的疲劳行为提供了有价值的信息。
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引用次数: 0
Effect of Structural Anisotropy on a Fracture Mode of Ferromagnetic Steels Under Cyclic Loading 结构各向异性对循环载荷下铁磁钢断裂模式的影响
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-17 DOI: 10.1007/s11223-024-00666-0
O. P. Gopkalo, G. Ya. Bezlyudko, Yu. P. Kurash

The potentials of nondestructive test methods are experimentally substantiated to get a cyclic loading fracture mode of ferromagnetic steels against their structural anisotropy, determined by coercive force measurements. Elastic static or cyclic loading was revealed to be consistent with a stable structure with certain anisotropy kinetics due to applied stresses. After plastic deformation, a new stable structure is formed induced by residual stresses. The anisotropy factor depended on the level of active relative stresses under elastic and elastoplastic, static, or cyclic loading. The change in kinetics direction for the anisotropy factor with elastic or elastoplastic loading defines the safe range of mechanical loading caused by reversible damage processes, as well as the ranges of accumulation risks for irreversible fatigue, high- and low-cycle fatigue and quasistatic damages giving rise to corresponding fracture modes. The nondestructive coercimetric method permits setting the metal endurance, yield limit, and transition stress from low-cycle fatigue to low-cycle quasistatic fracture.

通过实验证实了无损检测方法的潜力,从而获得了铁磁钢的循环加载断裂模式与结构各向异性之间的关系。结果表明,弹性静态或循环加载与稳定结构一致,并因外加应力而具有一定的各向异性动力学。塑性变形后,新的稳定结构在残余应力的作用下形成。各向异性因子取决于弹性和弹塑性、静态或循环加载下的有效相对应力水平。各向异性因子随弹性或弹塑性载荷的动力学方向变化,确定了由可逆损伤过程引起的机械载荷的安全范围,以及不可逆转疲劳、高循环和低循环疲劳以及引起相应断裂模式的准静态损伤的累积风险范围。无损矫顽法可设定金属耐久性、屈服极限以及从低周期疲劳到低周期准静态断裂的过渡应力。
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引用次数: 0
Residual Stress Effect on Limiting Cycle Amplitudes in Welded Joints 残余应力对焊接接头极限循环振幅的影响
IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Pub Date : 2024-09-17 DOI: 10.1007/s11223-024-00669-x
V. O. Degtyarev

The paper proposes a method for determining diagrams of the limiting cycle amplitudes of welded joints with steady-state residual tensile stresses based on the test results of small-sized specimens and presents the corresponding calculation dependencies. This technique is an express method for estimating the fatigue resistance characteristics of welded joints if full-scale tests are not feasible. The analysis of literature data for various types of welded joints shows a good fit of the experimental and calculated values of the endurance limits of welded joints of low-carbon steels with low-alloy, low-strength steels. It is shown that the inclined section of the diagram with steady-state residual stresses is shifted in parallel relative to the diagram of cycle amplitudes of welded specimens without residual stresses. It has been established that the diagrams of the limiting cycle amplitudes of welded joints with different values of the steady-state residual stresses end on a line where each point at different average cycle stresses corresponds to the minimum limiting cycle amplitude of the welded joint with its particular value of the ultimate steady-state residual stress, which ensures the realization of the ultimate stress cycle. With the same value of the steady-state residual stress, the endurance limit of welded joints decreases with an increase in the yield strength. It is shown that low values of steady- state residual stresses result in nearly the same endurance limit reduction of butt welded joints of steels of different strengths. In contrast, their higher values aggravate the endurance limit deterioration of steels with higher mechanical characteristics.

本文提出了一种根据小尺寸试样的试验结果确定具有稳态残余拉应力的焊接接头极限循环振幅图的方法,并给出了相应的计算依赖关系。在无法进行全尺寸试验的情况下,该技术是估算焊接接头抗疲劳特性的一种有效方法。对各种类型焊接接头的文献数据分析显示,低碳钢与低合金、低强度钢焊接接头耐久极限的实验值和计算值非常吻合。结果表明,与无残余应力的焊接试样周期振幅图相比,稳态残余应力图的倾斜部分平行移动。已经确定,具有不同稳态残余应力值的焊接接头的极限循环振幅图在一条直线上结束,在这条直线上,不同平均循环应力下的每个点都对应于具有特定极限稳态残余应力值的焊接接头的最小极限循环振幅,这确保了极限应力循环的实现。在稳态残余应力值相同的情况下,随着屈服强度的增加,焊接接头的耐久极限会降低。研究表明,稳态残余应力值较低时,不同强度钢材的对接焊点的耐久极限降低幅度几乎相同。相反,残余应力值越高,机械特性越高的钢材的耐久极限越差。
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引用次数: 0
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