Engineering Failure Analysis最新文献_第5页

Failure analysis of photovoltaic strings by constructing a digital multi-twin integrating theory, features, and vision 通过构建集理论、特征和愿景于一体的数字多重双绞线分析光伏串的故障

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-16 DOI: 10.1016/j.engfailanal.2024.108980

Timely and accurate failure analysis of photovoltaic (PV) systems is crucial forensuring the stable operation of power grids. However, existing failure analysis and diagnosis algorithms based on deep neural networks excessively rely on high-quality failure state data collected by sensors. This is extremely difficult to achieve in real photovoltaic power plants that are commonly equipped with self-protection mechanisms. To address this issue, we propose a Digital Multi-Twin integrating Theory, Features, and Vision (TFV-DMT) for failure analysis of PV strings in PV systems. This method first constructs theoretical simulation twins, feature twins, and visual twins based on the concept of digital twins, specifically tailored for actual PV systems, and designs a multi-twin collaborative model for model updating and failure diagnosis. Secondly, to better construct the visual twin, we introduce a Two-Dimensional Gram Angle Field Transformation Algorithm (TDGAF) to achieve targeted two-dimensional mapping of PV feature data, facilitating a more direct expression of failure characteristics. Furthermore, by constructing a Swish-activated Deep Convolutional Generative Adversarial Network (SDCGAN) to achieve balanced augmentation of mapping data, the model bias of theoretical simulation twins can be reduced. Finally, we propose a Swin-LT network that incorporates a Lightweight Dual-Channel Attention Module (LDAM) to better analyze the features of the visual twin, enabling more precise fault diagnosis. The algorithm has been validated on a real 250 kW grid-connected PV system, with results indicating that the proposed digital twin model is effective, achieving a diagnosis accuracy rate of 98.8 % for string failures.

对光伏（PV）系统进行及时、准确的故障分析是确保电网稳定运行的关键。然而，现有的基于深度神经网络的故障分析和诊断算法过度依赖于传感器收集的高质量故障状态数据。这在通常配备有自我保护机制的真实光伏电站中极难实现。为解决这一问题，我们提出了一种集理论、特征和视觉于一体的数字多双胞胎（TFV-DMT），用于光伏系统中光伏串的故障分析。该方法首先基于数字孪生的概念，专门针对实际光伏系统构建了理论模拟孪生、特征孪生和视觉孪生，并设计了用于模型更新和故障诊断的多孪生协同模型。其次，为了更好地构建视觉孪生，我们引入了二维革兰氏角场变换算法（TDGAF），有针对性地实现光伏特征数据的二维映射，从而更直接地表达故障特征。此外，通过构建 Swish 激活深度卷积生成对抗网络（SDCGAN）来实现映射数据的均衡增强，可以减少理论模拟双胞胎的模型偏差。最后，我们提出了一种结合了轻量级双通道注意模块（LDAM）的 Swin-LT 网络，以更好地分析视觉孪生体的特征，从而实现更精确的故障诊断。该算法已在一个实际的 250 千瓦并网光伏系统上进行了验证，结果表明所提出的数字孪生模型是有效的，对组串故障的诊断准确率达到 98.8%。

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引用次数: 0

Failure analysis of forged aluminium components 锻造铝部件的失效分析

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-16 DOI: 10.1016/j.engfailanal.2024.108979

Defects identified as bubbles and fissures were found in aluminium components used in internal combustion engines forged from flat extruded bars. Samples exhibiting these features were sectioned and prepared for microstructural characterization using light optical and scanning electron microscopy. The analyses were also conducted in samples that did not have such defects for comparison. The bubbles revealed the presence of oxidation and carbon residues in their interior and a series of cracks that developed from them. The fractured surface of the cracked samples revealed the presence of similar residues. The study was complemented with metallographic observations on samples cut from extruded bars from which the components were forged to identify the origin of the defects in forged pieces. These studies revealed the presence of cracks and voids close to the surface of the extruded bars. Therefore, it was concluded that the bubbles and cracks originated from the lubricant used in forging trapped within the voids and cracks of the extruded bars. The lubricant will volatilize and expand in such a case, causing bubbles and cracks in the forged components. The analyses conducted to the establishment of a quality criterion for acceptance of extruded bars.

在用扁平挤压棒锻造的内燃机铝部件中发现了气泡和裂缝等缺陷。使用光学显微镜和扫描电子显微镜对具有这些特征的样品进行切片和微结构表征。同时还对没有这些缺陷的样品进行了分析，以进行比较。气泡显示其内部存在氧化和碳残留物，并由此产生了一系列裂纹。裂纹样品的断裂表面也发现了类似的残留物。除了这项研究之外，还对从挤压棒材上切割下来的样品进行了金相观察，以确定锻造部件中缺陷的来源。这些研究表明，挤压棒表面附近存在裂缝和空隙。因此，得出的结论是，气泡和裂纹源于锻造过程中使用的润滑剂滞留在挤压棒的空隙和裂纹中。在这种情况下，润滑剂会挥发膨胀，导致锻造部件出现气泡和裂纹。通过分析，制定了验收挤压棒材的质量标准。

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引用次数: 0

Fatigue crack initiation and failure analysis of IN718 alloy after push–pull loading at room temperature and at 700 °C IN718 合金在室温和 700 °C 条件下受到推拉载荷后的疲劳裂纹起始和失效分析

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-16 DOI: 10.1016/j.engfailanal.2024.108977

The paper deals with the effect of applied fatigue loading with cycle asymmetry parameter R = −1(a symmetric push–pull, σ_m = 0 MPa), test temperature and loading frequency on the initiation of fatigue cracks in superalloy IN718. Two sets of experimental specimens were fabricated, for fatigue tests at ambient temperature and fatigue tests at 700 ± 5 °C. The loading frequency was f ≈ 20 150 Hz at ambient temperature and f ≈ 58 Hz at 700 ± 5 °C. The number of cycles to fracture, N_f = 2.10⁷, was determined as the so-called “run-out”. SEM fractography analysis was performed on all specimens to define the fatigue crack initiation mechanism. Fatigue crack initiation was always performed on the surface of the samples, most often by the slip mechanism (PSB′s − Persistent Slip Bands) − tests at ambient temperature, in the case of tests at 700 ± 5 °C, initiation was observed on the oxide phases on the surface or just below the surface. The initiation of oxide phases (mostly of NiO or FeO type) on the surface at 700 ± 5 °C is related to the creep-fatigue load interaction. After fatigue tests, S-N fatigue life curves were plotted with emphasis on determining the N_i − critical number of cycles required to initiate a fatigue crack with approximate length “a” ≈ 25 μm. Based on the tests performed, it can be concluded that the number of cycles required to initiate a crack of critical dimensions increases with decreasing load amplitude σ_a. In general, the fatigue crack initiation (depending on the microstructure and the δ-phase fraction) in the case of superalloy IN718 represents approximately 80–90 % of the total fatigue life.

本文论述了循环不对称参数 R =-1（对称推拉，σm = 0 MPa）、试验温度和加载频率对超耐热合金 IN718 产生疲劳裂纹的影响。我们制作了两组实验试样，分别用于环境温度下的疲劳试验和 700 ± 5 °C 下的疲劳试验。环境温度下的加载频率为 f≈20 150 Hz，700 ± 5 °C 下的加载频率为 f≈58 Hz。断裂循环次数 Nf = 2.107，即所谓的 "跑偏"。对所有试样进行了 SEM 断裂分析，以确定疲劳裂纹的起始机制。疲劳裂纹总是在试样表面产生，最常见的是滑移机制（PSB′s - 持久滑移带）--在环境温度下进行的测试，在 700 ± 5 °C 下进行的测试，在表面或表面下的氧化物相上观察到裂纹产生。在 700 ± 5 °C的温度下，表面氧化物相（主要是氧化镍或氧化铁类型）的形成与蠕变-疲劳载荷相互作用有关。疲劳试验后，绘制了 S-N 疲劳寿命曲线，重点是确定产生疲劳裂纹（长度 "a"≈ 25 μm）所需的 Ni 临界循环次数。根据所进行的试验，可以得出结论：产生临界尺寸裂纹所需的循环次数随着载荷振幅σa的减小而增加。一般来说，超合金 IN718 的疲劳裂纹起始（取决于微观结构和 δ 相分数）约占总疲劳寿命的 80-90%。

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引用次数: 0

Dynamic mechanical behavior and failure characteristics of jointed rock-like specimen under impact load 冲击载荷下节理岩状试样的动态力学行为和破坏特征

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-15 DOI: 10.1016/j.engfailanal.2024.108975

Understanding the mechanical response and failure characteristics of jointed rock masses under multiple dynamic disturbances is crucial for the stability and safety of rock engineering projects. In this study, multi-stage impact loading tests and numerical simulations were conducted on jointed rock-like specimens with sawtooth joints to investigate the effect of joint roughness and joint morphology on dynamic properties and failure characteristics of jointed rock. The results indicate that the dynamic strength, average Young’s modulus, and total impact numbers decreased with the increase of the Joint roughness coefficient (JRC). The triangular tooth-shaped joints with smaller joint heights had higher bearing capacities. The failure modes and damage evolution characteristics of jointed specimens under impacts were also investigated from the energy perspective. The results show that the dynamic failure modes of jointed rock-like specimens mainly include two types: abrasive failure and tensile cracking failure, and tensile cracking failure can be further divided into tensile splitting failure and oblique tensile failure. The total energy and energy density of the specimens with different JRC were investigated. The results show that the total deformation energy and energy density decreased with the increase of JRC under impact loading. The higher the roughness of the specimens, the faster the increase in the damage variable. The asperity height had a significant impact on the damage evolution under impact load. The higher the triangle joint asperity height, the fewer the number of impacts required to reach the same level of damage under the same swing angle. These findings contribute to a deeper understanding of the complex failure mechanisms in jointed rock masses, providing valuable insights for designing safer and more resilient rock engineering structures.

了解节理岩体在多重动态扰动下的力学响应和破坏特征对于岩石工程项目的稳定性和安全性至关重要。本研究对具有锯齿状节理的节理岩类试样进行了多级冲击加载试验和数值模拟，以研究节理粗糙度和节理形态对节理岩动态特性和破坏特征的影响。结果表明，随着节理粗糙度系数（JRC）的增加，动态强度、平均杨氏模量和总冲击次数都有所下降。节理高度较小的三角形齿状节理具有较高的承载能力。此外，还从能量角度研究了接合试样在冲击下的破坏模式和损伤演变特征。结果表明，类岩石节理试件的动态破坏模式主要包括磨蚀破坏和拉裂破坏两种类型，拉裂破坏又可分为拉裂破坏和斜拉破坏。研究了不同 JRC 试样的总能量和能量密度。结果表明，在冲击载荷作用下，总变形能和能量密度随 JRC 的增加而降低。试样的粗糙度越高，破坏变量的增加速度越快。棱台高度对冲击载荷下的损伤演变有显著影响。在相同摆动角度下，三角接合处的表面高度越高，达到相同破坏程度所需的冲击次数就越少。这些发现有助于加深对节理岩体复杂破坏机制的理解，为设计更安全、更具弹性的岩石工程结构提供了宝贵的见解。

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引用次数: 0

Failure mechanism of severe deformation in gob-side entry rib and unloading-supporting coupling control technology 鹅卵石侧入口肋严重变形的失效机理和卸载支撑耦合控制技术

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-15 DOI: 10.1016/j.engfailanal.2024.108973

Given the problem of the solid coal side produces strong mine pressure in the stage of strong mining and lagging dynamic pressure in the gob-side entry retaining (GER). Using the W3₂33 ventilation roadway in the West-Third mining area as a case study, the research employs numerical simulation, field observation, and engineering analogy. Key findings include: (1) The optimal plan reduces maximum stress on the coal side and shifts it inward, primarily by severing the main roof and alleviating the gangue wall load, offering limited pressure relief on the solid coal rib. (2) When hole-creating depth is too close to the solid coal rib (b = 6 m), it compromises integrity. If the depth exceeds the stress maximum region (b = 10 m), it fails to effectively sever the peak stress area. However, a depth within the stress maximum region (b = 8 m) effectively absorbs and transfers stress, with a buffer area of approximately 3.7 m from the external support area. (3) The length of the hole (l = 2, 4, 6 m) directly affects deformation absorption and pressure relief, while longitudinal row spacing (s = 2.7, 3.6, 4.5 m) has an inverse effect. For optimal results, a hole length of 4 m and a row spacing of 3.6 m are recommended. (4) After 150 days, the new bag pressure regulating system maintains about 40 % of the absorbable deformation space in the LPRH, confirming simulation results. Observations show that external support forces remain stable at around 250 kN, and coal rib displacement is controlled within 350 mm, over 65 % less than similar GER sections with comparable geological conditions. This research introduces a novel technology and methodology for managing large deformations of the solid coal rib in gob-side dynamic pressure roadways, providing significant reference value.

鉴于固体煤面在强采阶段会产生强大的矿压，而在掘进进尺（GER）中又会产生滞后动压的问题。该研究以西三采区 W3233 通风巷道为例，采用数值模拟、现场观测和工程类比等方法进行研究。主要研究结果包括(1) 最佳方案主要通过切断主顶板和减轻矸石壁载荷来减少煤侧最大应力并将其内移，从而有限地减轻实心煤肋的压力。(2）当开孔深度太靠近实心煤筋（b = 6 米）时，会影响完整性。如果深度超过应力最大区域（b = 10 米），则无法有效切断应力峰值区域。但是，如果深度在应力最大区域内（b = 8 米），则可有效吸收和传递应力，缓冲区距外部支撑区约 3.7 米。(3) 孔洞长度（l = 2、4、6 米）直接影响变形吸收和压力释放，而纵向行距（s = 2.7、3.6、4.5 米）则具有反向影响。为达到最佳效果，建议孔长为 4 米，行距为 3.6 米。(4) 150 天后，新的袋压力调节系统在 LPRH 中保持了约 40% 的可吸收变形空间，证实了模拟结果。观测结果表明，外部支撑力稳定在 250 kN 左右，煤肋位移控制在 350 mm 以内，比地质条件相当的类似 GER 断面减少 65% 以上。这项研究引入了一种新的技术和方法来管理巷侧动压巷道中实煤肋的大变形，具有重要的参考价值。

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引用次数: 0

Numerical and experimental research on the bearing characteristics and failure mechanism of zinc-cast socket termination for wire rope. Part 1: Methodology and theory 钢丝绳用锌铸插座终端的轴承特性和失效机理的数值和实验研究。第 1 部分：方法与理论

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-15 DOI: 10.1016/j.engfailanal.2024.108957

To investigate the effects of various parameters on the load-bearing characteristics and failure mechanism of the zinc-cast socket termination for wire rope, a simulation model was constructed using a 7-wire strand (1 + 6 structure) with Zinc alloy filled socket termination as an example in this study, including three inverse methods used to obtain the precise material properties and interface bonding property (IBP) and cohesive element used to characterize the bonding effects obtained from pull-out tests. Additionally, full-scale rope pull-out tests were carried out, and the constructed model was validated by comparing simulation with experiment results. Finally, based on the model, the effects of anchorage length, material properties of Zinc alloy, IBP, friction coefficient between socket and cast cone on the load-bearing characteristics and failure mechanism of the socket termination were investigated. Results demonstrate that the load-bearing performance of the socket is highly influenced by the elastic modulus and yield strength of the Zinc alloy and IBP, which should be paid attention to in the future design and application. Furthermore, the methodology employed in this paper to construct a finite element model of zinc-cast socket termination for wire rope has been demonstrated to be both reasonable and effective. This provides a foundation for subsequent research of zinc-cast socket termination for wire rope with complex structures.

为了探究各种参数对钢丝绳锌铸嵌套端头的承载特性和失效机理的影响，本研究以锌合金填充嵌套端头的 7 股钢丝绳（1 + 6 结构）为例，建立了一个模拟模型，其中包括用于获得精确材料特性和界面粘合特性（IBP）的三种反演方法，以及用于表征拉出试验中粘合效应的内聚元素。此外，还进行了全尺寸绳索拉出试验，并通过比较模拟和试验结果验证了所构建的模型。最后，在模型的基础上，研究了锚固长度、锌合金材料特性、IBP、套筒与铸锥之间的摩擦系数对套筒终端承载特性和失效机理的影响。结果表明，承插口的承载性能受锌合金和 IBP 的弹性模量和屈服强度影响较大，这在今后的设计和应用中应引起重视。此外，本文采用的构建钢丝绳锌铸插座终端有限元模型的方法被证明是合理而有效的。这为后续研究具有复杂结构的钢丝绳用锌铸插座终端奠定了基础。

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引用次数: 0

Investigation into the erosion damage mechanism of High-Temperature, High-Pressure, and High-Speed gasflow on metal surfaces 高温高压高速气流对金属表面侵蚀破坏机理的研究

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-15 DOI: 10.1016/j.engfailanal.2024.108976

High-temperature, high-pressure, and high-speed gasflow can accelerate material loss on metal components, shortening their service life. To explore the mechanisms behind this erosion damage, a stepwise experimental approach was conducted, using high-pressure, high-speed argon gas and high-temperature, high-pressure, high-speed propellant gas to erode the surfaces of gun steel specimens. The investigation centered on the interaction of thermal, chemical, and mechanical factors. An analysis of the surface after erosion was conducted using scanning electron microscopy-energy dispersive spectrometry (SEM-EDS), X-ray diffractometry (XRD), and electron backscatter diffraction (EBSD) to evaluate the morphology of the surface, distribution of elements, and composition of phases. The findings indicate that the primary cause of material loss is the mechanical effect of the gasflow scouring. While the initial impact on smooth surfaces is minimal, it becomes significant once cracks develop and the surface becomes rough. This leads to a continuous erosion process and a wear phenomenon of the surface material. The white layer promoted by the thermal and chemical actions is partitioned into two distinct layers. The outer white layer is made up of the austenite, the cementite, and the iron oxide. It is very brittle, easily broken, and flaked. The inner white layer consists of a fine-grained mixture of martensite and austenite. During the rapid and intense heat transfer, the shallow layer experiences thermal stresses, forming small cracks that weaken the integrity of the surface. Ultimately, due to the combined impact of three factors, the surface of the component fractures and deteriorates inwardly.

高温、高压和高速气流会加速金属部件的材料损耗，缩短其使用寿命。为了探索这种侵蚀破坏背后的机理，我们采用了逐步实验的方法，使用高压、高速氩气和高温、高压、高速推进气体侵蚀枪钢试样的表面。研究集中于热、化学和机械因素的相互作用。使用扫描电子显微镜-能量色散光谱仪（SEM-EDS）、X 射线衍射仪（XRD）和电子反向散射衍射仪（EBSD）对侵蚀后的表面进行了分析，以评估表面形态、元素分布和相组成。研究结果表明，材料流失的主要原因是气流冲刷的机械效应。虽然最初对光滑表面的影响很小，但一旦出现裂缝，表面变得粗糙，这种影响就会变得很大。这导致了持续的侵蚀过程和表面材料的磨损现象。热作用和化学作用产生的白层分为两个不同的层。白色外层由奥氏体、雪明体和氧化铁组成。它非常脆，容易破碎和剥落。白色内层由马氏体和奥氏体的细粒混合物组成。在快速而强烈的热传递过程中，浅层受到热应力，形成细小裂纹，削弱了表面的完整性。最终，在三个因素的共同作用下，部件表面发生断裂并向内退化。

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引用次数: 0

Investigation of surface structuring and oxidation performance of Inconel 718 superalloy by laser remelting with different patterns 通过不同模式的激光重熔研究 Inconel 718 超合金的表面结构和氧化性能

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-13 DOI: 10.1016/j.engfailanal.2024.108974

The current paper deals with the effect of CO₂ laser remelting on the surface structuring and oxidation performance of Inconel 718 superalloy, pointing out different laser-induced surface patterns that make a difference in their oxidation properties vital for high-temperature applications. Surface roughness, microstructure, and oxidation behavior characterization were performed using 3D optical profilometry, SEM, and XRD techniques. The oxidation tests conducted at 1000 °C for 24 h have revealed that remelted surfaces offered better oxidation resistance compared to untreated samples. Notably, the patterned sample showed the lowest weight gain under oxidation, and a parabolic regime in oxidation occurred after 100 min; while in an untreated reference sample, this appears only after 200 min. This improvement in performance results from the formation of a chromium-rich oxide layer on the melt pools, which acts as an effective barrier against further oxidation. The findings show that laser remelting, especially with grid-like surface patterns, results in an improvement in both durability and high-temperature performance of Inconel 718; therefore, it is apparently a very promising technique for lifespan extension of industrially relevant materials.

本文论述了二氧化碳激光重熔对 Inconel 718 超合金表面结构和氧化性能的影响，指出了不同的激光诱导表面模式对其氧化性能的影响，这些模式对高温应用至关重要。采用三维光学轮廓仪、扫描电镜和 XRD 技术对表面粗糙度、微观结构和氧化行为进行了表征。在 1000 °C 下进行 24 小时的氧化测试表明，与未经处理的样品相比，重熔表面具有更好的抗氧化性。值得注意的是，经过图案化处理的样品在氧化过程中的增重最小，在 100 分钟后出现了氧化抛物线；而未经处理的参考样品在 200 分钟后才出现这种情况。性能的改善是由于在熔池上形成了富铬氧化层，该层可有效阻止进一步氧化。研究结果表明，激光重熔，特别是采用网格状表面模式，可提高铬镍铁合金 718 的耐久性和高温性能；因此，这显然是一种非常有前途的技术，可用于延长工业相关材料的使用寿命。

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引用次数: 0

Failure of a tantalum lined tee induced by hydrogen embrittlement 氢脆引发的钽内衬三通失效

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-12 DOI: 10.1016/j.engfailanal.2024.108969

A lined tee leaked a high temperature mixture of HCI gas and steam from the inner tantalum liner into the external carbon pipe. The main causes of failure have been proposed based on several analysis methods, including macroscopic examination, metallographic inspections, chemical composition analysis, hardness test, scanning electron microscopy analysis and energy dispersive spectrometry test. On the basis of experimental analyses, computational fluid dynamics simulations were employed to explore the flow fields of HCI gas and steam in pipelines. It was found that the failure region of the tantalum liner was coincidence with the mixture zone of two media. The root cause of failure was the formation of liquid hydrochloric acid during the start-up of equipment, causing that hydrogen ions in liquid hydrochloric acid penetrated into tantalum, resulting in hydrogen embrittlement cracks. Meanwhile, pitting corrosion was caused in mixing areas. Adjusting the structure of tee pipe from T-type to Y-type was put forward to prevent equipment failure.

内衬三通将高温 HCI 气体和蒸汽混合物从钽内衬泄漏到外部碳管中。根据几种分析方法，包括宏观检查、金相检查、化学成分分析、硬度测试、扫描电子显微镜分析和能量色散光谱测试，提出了失效的主要原因。在实验分析的基础上，利用计算流体动力学模拟探索了管道中 HCI 气体和蒸汽的流场。结果发现，钽衬垫的失效区域与两种介质的混合区重合。失效的根本原因是设备启动过程中盐酸液的形成，导致盐酸液中的氢离子渗入钽，从而产生氢脆裂纹。同时，在混合区域也造成了点状腐蚀。为防止设备故障，提出将三通管的结构由 T 型调整为 Y 型。

引用次数: 0

TVMS calculation model for gear tooth tip chipping failure with EHL 使用 EHL 的齿轮齿尖崩齿失效 TVMS 计算模型

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis

Pub Date : 2024-10-12 DOI: 10.1016/j.engfailanal.2024.108971

This paper proposes a calculation method for Time-Varying Mesh Stiffness (TVMS) in the presence of tooth tip chipping defects under elastohydrodynamic lubrication (EHL). A contact stiffness model for tooth tip chipping defects under EHL is established, and an analytical equation for the TVMS of chipping defects under EHL is derived. The torsional stiffness at the chipping defect under EHL is introduced, considering the influence of roughness at the chipping defect on the characteristics of the oil film and its stiffness. The effects of chipping defect size, torsional stiffness of the chipping defect under EHL, roughness, and oil film stiffness on TVMS are analyzed, providing methodological support for improving the calculation accuracy of gear TVMS.

本文提出了一种在弹性流体动力润滑（EHL）条件下存在齿尖崩裂缺陷时的时变网格刚度（TVMS）计算方法。建立了 EHL 下齿尖崩刃缺陷的接触刚度模型，并推导出 EHL 下崩刃缺陷 TVMS 的解析方程。考虑到崩角缺陷处的粗糙度对油膜特性及其刚度的影响，引入了 EHL 下崩角缺陷处的扭转刚度。分析了缺口尺寸、EHL 下缺口扭转刚度、粗糙度和油膜刚度对 TVMS 的影响，为提高齿轮 TVMS 的计算精度提供了方法支持。

引用次数: 0