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【新文速递】2023年10月6日复合材料SCI期刊最新文章

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今日更新:Composite Structures 2 篇,Composites Part A: Applied Science and Manufacturing 1 篇,Composites Part B: Engineering 2 篇,Composites Science and Technology 2 篇

Composite Structures

Comprehensive investigation into grinding characteristics and damage behavior of Cf/SiC composite modified by picosecond-laser ablating

Xiao Guijian, Li Xin, Zhou Kun, Yang Zhengyu

doi:10.1016/j.compstruct.2023.117600

皮秒激光烧蚀改性 Cf/SiC 复合材料的磨削特性和损伤行为综合研究

Cf/SiC composite is known as difficult-to-machine materials. This study introduced laser-ablating assisted grinding (LAAG) method, and explored the relationship between processing parameters and surface/subsurface damage behavior of Cf/SiC composite. It was revealed that SiO2 ablation products with a loose structure were formed during picosecond-laser ablating, and the ablated layers showed excellent machinability during grinding. Cf/SiC composite underwent brittle removal during conventional grinding (CG); however, significant ductile fracture and smeared removal appearance were clearly observed on the ground surfaces during LAAG. As the grinding speed increased, the grinding forces during LAAG were further decreased, and the brittle-ductile transformation of the normal fiber became more significant. The increase of feed speed would increase the grinding forces and enhance the brittle removal behavior of Cf/SiC composite. The laser power affected the machined quality through the ablation depth and the ablative transformation, and a smaller laser scanning distance would result in a flatter ground surface. Furthermore, subsurface damage of Cf/SiC composite after LAAG was slight, which primarily displayed as interface debonding and SiC matrix cracking. The grinding chips generated during LAAG were primarily composed of cut fiber-bundle and curled SiC matrix, rather than macro-fractured fiber and matrix with unordered size and shape.

Cf/SiC 复合材料是众所周知的难加工材料。本研究引入激光烧蚀辅助研磨(LAAG)方法,探讨了 Cf/SiC 复合材料的加工参数与表面/次表面损伤行为之间的关系。结果表明,在皮秒激光烧蚀过程中形成了结构疏松的二氧化硅烧蚀产物,烧蚀层在研磨过程中表现出良好的可加工性。Cf/SiC复合材料在传统磨削(CG)过程中会发生脆性去除;但在LAAG过程中,磨削表面明显出现韧性断裂和斑点状去除。随着磨削速度的增加,LAAG 磨削过程中的磨削力进一步减小,普通纤维的脆-韧性转变更加明显。进给速度的增加会提高磨削力,并增强 Cf/SiC 复合材料的脆性去除行为。激光功率通过烧蚀深度和烧蚀转变影响加工质量,激光扫描距离越小,磨削表面越平整。此外,LAAG 后 Cf/SiC 复合材料的次表面损伤轻微,主要表现为界面脱粘和 SiC 基体开裂。LAAG 过程中产生的磨屑主要由切割的纤维束和卷曲的碳化硅基体组成,而不是尺寸和形状无序的宏观断裂纤维和基体。


Natural frequencies of submerged microplate structures, coupled to stationary fluid, using modified strain gradient theory

Khorshidi Korosh, Soltannia Babak, Karimi Mahdi, Zakaryaei Mahdi

doi:10.1016/j.compstruct.2023.117583

利用修正的应变梯度理论计算与静止流体耦合的浸没式微板结构的固有频率

This paper investigates the free vibration analysis of a microplate, interacting with a stationary fluid. For the fluid part, the potential flow assumptions are considered, and it is supposed to be incompressible, irrotational and inviscid. Different positions for the fluid relative to the structure are studied: a structure in contact with a fluid with a free surface, a submerged microplate and a floating structure. For the structure, the mechanical properties of the microplate such as density, Young modulus and shear modulus are assumed to be a function of structure thickness. Besides, the modified strain gradient theory on the basis of higher-order plate theory is adopted to capture the size effects of the microplate. Using Bernoulli’s relation and fluid velocity potential function, the fluid pressure affecting the microplate is calculated, and then Hamilton’s principle is employed to derive coupled fluid-solid equations of motion. After validation of the presented formulations, a comprehensive parametric study is conducted to exhibit the response of the system under variations of some parameters such as structure mechanical properties, fluid parameters and size- effect parameters.

本文研究了与静止流体相互作用的微孔板的自由振动分析。对于流体部分,考虑了势流假设,并假定其为不可压缩、不旋转和不粘性流体。研究了流体相对于结构的不同位置:与自由表面流体接触的结构、浸没微孔板和浮动结构。对于结构,假定微孔板的力学性能(如密度、杨氏模量和剪切模量)是结构厚度的函数。此外,在高阶板理论的基础上采用修正应变梯度理论来捕捉微板的尺寸效应。利用伯努利关系和流体速度势函数计算影响微板的流体压力,然后利用汉密尔顿原理推导流固耦合运动方程。在对所提出的公式进行验证后,进行了全面的参数研究,以展示系统在一些参数(如结构机械性能、流体参数和尺寸效应参数)变化时的响应。


Composites Part A: Applied Science and Manufacturing

Understanding the static performance of composite helical springs with braided nested structures

Chen Ling, Chong Joel, Jiang Qian, Wu Liwei, Tang Youhong

doi:10.1016/j.compositesa.2023.107822

 

了解具有编织嵌套结构的复合螺旋弹簧的静态性能

Application of composite helical springs (CHSs) is constrained by their poor static compression performance. In this study, a novel composite helical spring with a braided nested structure (BNCHS) is proposed. The fiber volume fraction (Vf) of BNCHS with braided angle of 15° and 30° (BNCHS15° and BNCHS30°) only increases by 0.9% and 1.8% respectively comparing with that of unidirectional composite helical spring with Vf of 55% (UCHS55%). The compression experimental results show that the spring constant of BNCHS15° and BNCHS30° can reach 105.4% and 171.4% higher than that of UCHS55% respectively. The internal mechanism of significantly improving compression performance of BNCHS is revealed by using a meso model. Numerical result shows that the mises stress of BNCHS15° and BNCHS30° can be 2.43 and 3.14 times higher than that of UCHS55% respectively. Finally, the resilience and specific spring stiffness of BNCHS and steel are compared, highlighting the obvious advantage of static performance of BNCHS.

复合螺旋弹簧(CHS)的应用因其较差的静态压缩性能而受到限制。本研究提出了一种新型编织嵌套结构复合螺旋弹簧(BNCHS)。与 Vf 为 55% 的单向复合螺旋弹簧(UCHS55%)相比,编织角为 15° 和 30° 的 BNCHS(BNCHS15° 和 BNCHS30°)的纤维体积分数(Vf)分别只增加了 0.9% 和 1.8%。压缩实验结果表明,BNCHS15° 和 BNCHS30° 的弹簧常数分别比 UCHS55% 高出 105.4% 和 171.4%。利用中观模型揭示了 BNCHS 压缩性能大幅提高的内部机理。数值结果表明,BNCHS15° 和 BNCHS30° 的米塞斯应力分别是 UCHS55% 的 2.43 倍和 3.14 倍。最后,比较了 BNCHS 和钢的回弹性和特定弹簧刚度,突出了 BNCHS 在静态性能方面的明显优势。


Composites Part B: Engineering

SiC/Co composite fibers with enhanced conductivity and magnetic coupling developed for reinforcing and high-efficiency electromagnetic absorbing (EMA) materials

Guan Zhen-Jie, Yang Bo-An, Sun Xue-Yin, Li Yang, Jiang Jian-Tang, Song Bo, Gong Yuan-Xun, Zhen Liang

doi:10.1016/j.compositesb.2023.111010

 

开发出具有增强导电性和磁耦合性的 SiC/Co 复合纤维,用于增强和高效电磁吸收 (EMA) 材料

For the design requirements for structural/functional integrated components, it is urgent to find EMA materials combining high-efficient EMA performances and load bearing capacity. Herein, high-strength SiC fibers are modified by Co nanoparticles to construct SiC/Co composite fibers by the liquid-phase method and subsequent hydrogen-thermal annealing. The conductivity of single SiC/Co fiber can be improved by increasing the diameter and content of Co nanoparticles, which leads to enhanced conduction loss and then dominates the dielectric loss. The cross-linked SiC/Co fibers with high conductivity also contribute to significant eddy current loss. Micromagnetic simulation based on Landau-Lifshitz-Gilbert equation (LLG) quantificationally reveals that reducing Co diameter from 140 nm to 30 nm can enhance the ferromagnetic loss by 17.19 times, and this law also can be confirmed by the effect medium theory. Maximum reflection loss (RL max) can reach −78.0 dB at 11.8 GHz and effective absorbing bandwidth with RL < −10 dB (ERL10) of 6.6 GHz can be observed in these SiC/Co-400 filled specimens with the thickness of only 2.7 mm. These SiC/Co fibers present excellent absorbing performances and display the potential for developing into load-bearing and high-efficiency EMA materials.

为满足结构/功能一体化组件的设计要求,迫切需要找到兼具高效 EMA 性能和承载能力的 EMA 材料。本文采用液相法和氢热退火法对高强度碳化硅纤维进行钴纳米颗粒改性,从而构建碳化硅/钴复合纤维。单根 SiC/Co 纤维的导电性可以通过增加 Co 纳米粒子的直径和含量得到改善,从而提高传导损耗,进而主导介电损耗。具有高导电率的交联碳化硅/钴纤维也会造成显著的涡流损耗。基于 Landau-Lifshitz-Gilbert 方程(LLG)的微磁模拟定量地揭示了将 Co 的直径从 140 nm 减小到 30 nm 可使铁磁损耗增加 17.19 倍,这一规律也可通过效应介质理论得到证实。最大反射损耗(RL max)可达到 -78.0 dB,频率为 11.8 GHz,RL < -10 dB 的有效吸收带宽(ERL 10)的有效吸收带宽为 6.6 千兆赫,而这些填充有 SiC/Co-400 的试样厚度仅为 2.7 毫米。这些 SiC/Co 纤维具有出色的吸收性能,有望发展成为承重和高效的 EMA 材料。


Modelling the gradual through thickness porosity formation and swelling during the thermal aggression of thermoplastic based laminates

Philippe D., Vieille B., Barbe F.

doi:10.1016/j.compositesb.2023.111026

基于热塑性塑料的层压板在热侵蚀过程中逐渐通过厚度形成孔隙和膨胀的建模

Impacting thermoplastic-based laminates by a high thermal energy -e.g. a flame- essentially causes the progressive deterioration of the matrix, involving solid-state transformations and dramatic variations of the thermomechanical properties. Throughout this process and because it is associated with significant through thickness gradients, the laminates retains a substantial capacity to sustain a mechanical load, even after matrix has melted. For temperatures higher than the melting temperature, the dominant mechanism of the matrix thermal decomposition is the formation of voids. Whereas they constitute a weakness from the mechanical point of view, they act as thermal insulators and contribute to the protection of the matrix on the side opposite to thermal aggression. Thus, describing accurately the kinetics of their formation is the key to a reliable control of the laminates thermomechanical properties evolution under fire conditions. As a prerequisite to this objective, the formation process was experimentally investigated. Results have evidenced the strong dependence of the porosity content and of the related swelling phenomenon to the time and temperature of thermal exposure. A mesoscopic Finite Element model representing porosities at a structural level was developed based on these observations. The porosity nucleation and the induced swelling were reproduced using a probabilistic approach to drive the progressive transformation of elements into porosities according to their thermal state.

以热塑性塑料为基础的层压板受到高热能(如火焰)的冲击,基本上会导致基体逐渐退化,其中包括固态转化和热机械性能的剧烈变化。在整个过程中,由于存在明显的厚度梯度,即使在基体熔化后,层压板仍能保持较强的承受机械负荷的能力。当温度高于熔化温度时,基体热分解的主要机制是形成空隙。虽然从机械角度来看,空隙是一个弱点,但它们却能起到热绝缘体的作用,有助于保护与热侵蚀相反一侧的基体。因此,准确描述空隙的形成动力学是可靠控制层压板在火灾条件下的热机械性能演变的关键。作为实现这一目标的先决条件,我们对形成过程进行了实验研究。结果表明,孔隙率和相关的膨胀现象与热暴露的时间和温度密切相关。基于这些观察结果,我们开发了一个介观有限元模型,在结构层面上表示多孔性。利用概率方法再现了多孔成核和诱导膨胀现象,从而根据元素的热状态将其逐步转化为多孔。


Composites Science and Technology

Bioinspired polysiloxane/WS2 composites with stretchable and near-infrared light remote-controlled self-healing abilities for deployable deformation actuators

Chen Juxiang, Zhang Kuiyuan, Shi Xiangrong, Huang Yudong, Jiang Bo

doi:10.1016/j.compscitech.2023.110297

 

生物启发聚硅氧烷/WS2 复合材料具有可拉伸和近红外光遥控自愈合能力,可用于可部署形变致动器

Despite tremendous advancement of actuators based on self-healing polymeric composites, inevitable trade-offs in maintaining sensitive stimuli response and mechanical and self-healing properties are still left in suspense. Inspired by the character of butterfly wings, herein, we proposed a brand-new strategy to design polysiloxane composites with bioinspired network structure, which consists of tannic acid modified photothermal reagent tungsten disulfide nanosheets as vein and self-healing polysiloxane elastomers with multiple dynamic bonds as embedded membrane. High dense hydrogen bonds between nanosheets and elastomers enable interfaces to enhance interfacial strength of composite. The elaborate bioinspired network was employed as an essential role to endow composites with conspicuous stretchability (1146%), and near-infrared light (NIR) remote-controlled self-healing efficiency (97%). Moreover, the composite with conspicuous bioinspired network structure is connected with low coefficient of thermal expansion film by hydrogen bonds gathered around the interface, which endows deployable deformation actuator with a remarkably fast NIR response (7.50 s) due to bioinspired heat conduction network pathway. This work offers a versatile bioinspired strategy for design of self-healing actuators with conspicuous responding deformation and mechanical properties that enables an application to a wide range of flexible and smart devices.

尽管基于自愈合聚合物复合材料的致动器取得了巨大进步,但在保持灵敏的刺 激响应、机械性能和自愈合性能方面仍存在不可避免的权衡问题。受蝴蝶翅膀特性的启发,我们在本文中提出了一种设计具有生物启发网络结构的聚硅氧烷复合材料的全新策略,即以单宁酸修饰的光热试剂二硫化钨纳米片为脉络,以具有多重动态键的自愈合聚硅氧烷弹性体为嵌入膜。纳米片和弹性体之间的高密度氢键使界面成为可能,从而增强了复合材料的界面强度。精心设计的生物启发网络在赋予复合材料明显的拉伸性(1146%)和近红外线(NIR)遥控自愈合效率(97%)方面发挥了重要作用。此外,这种具有明显生物启发网络结构的复合材料通过界面周围聚集的氢键与低热膨胀系数薄膜相连,由于生物启发热传导网络途径,这种复合材料赋予了可部署形变致动器显著的快速近红外响应(7.50 秒)。这项工作为设计具有明显响应形变和机械特性的自愈合致动器提供了一种多功能生物启发策略,可广泛应用于柔性和智能设备。


Correlating microstructure-property relationships in carbon fiber-expanded graphite hybrid composites for synergistic improvements in thermal and mechanical properties

Kadiyala Ajay, Owoeye Samuel, Hana John, Krishnamurthy Ajay, Venkatesan Karthik Rajan, Zekriardehani Shahab, Mapkar Javed A., Lawrence Joseph

doi:10.1016/j.compscitech.2023.110293

 

关联碳纤维-膨胀石墨混合复合材料的微观结构-性能关系,协同改善热性能和机械性能

Thermally conductive and structurally reinforcing polymer composites are in high demand for applications such as electric vehicles, rapid prototyping, and thermal interface materials. Including a single geometry (platelet or rod) filler is a common strategy to improve the performance of polymers. However, the thermal and mechanical properties follow an inverse dependence and often require high filler loadings that compromise the overall properties. Hybridization of filler geometries has effectively improved the thermal conductive network while retaining mechanical performance. The focus of this work is to understand the effect of microstructure and interactions of hybrid fillers in high strength thermally conductive composites. For this study, expanded graphite, and carbon fibers (CFs) were used as the hybrid filler system to improve the thermal conductivity and mechanical properties of polyamide-based thermoplastic composites. The detailed microstructural study revealed that at a lower normalized weight ratio of CFs, the fibers bridge the expanded graphite particles to create a filler-filler network which leads to synergistic effect on both the tensile strength (by 29%) and thermal conductivity (by 290%) compared to a single-filler expanded graphite-based system. Above a critical mass fraction of CF, the planar graphitic orientation led to a loss in thermal conductivity which is attributed to reduced exfoliation and packing density of fillers.

导热和结构增强聚合物复合材料在电动汽车、快速原型制造和热界面材料等应用中需求量很大。采用单一几何形状(板状或棒状)填料是提高聚合物性能的常用策略。然而,热性能和机械性能之间存在反比关系,通常需要较高的填充量,从而影响整体性能。填料几何形状的杂化可有效改善导热网络,同时保持机械性能。这项工作的重点是了解高强度导热复合材料中混合填料的微观结构和相互作用的影响。在这项研究中,膨胀石墨和碳纤维(CFs)被用作混合填料体系,以改善聚酰胺基热塑性复合材料的导热性和机械性能。详细的微观结构研究表明,在较低的碳纤维归一化重量比条件下,碳纤维会与膨胀石墨颗粒架桥,形成填料-填料网络,与基于膨胀石墨的单一填料体系相比,这种网络对拉伸强度(提高 29%)和热导率(提高 290%)都有协同作用。当 CF 的质量分数超过临界质量分数时,平面石墨取向会导致热导率下降,这是由于填料的剥离和堆积密度降低所致。



来源:复合材料力学仿真Composites FEM
ACTMechanicalSystemInspireMAGNET振动断裂复合材料汽车理论材料控制
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【新文速递】2023年9月26日固体力学SCI期刊最新文章

今日更新:International Journal of Plasticity 1 篇,Computer Methods in Applied Mechanics and Engineering 1 篇,Thin-Walled Structures 1 篇International Journal of PlasticityDamage-coupled unified constitutive modeling of 316LN stainless steel including dynamic strain aging under various tension dwell time: A macroscopic phenomenological studyChen Gang, Li Chengcheng, Xie Mingwei, Li Bingbing, Lin Qiangdoi:10.1016/j.ijplas.2023.103764316LN 不锈钢的损伤耦合统一构成模型,包括各种拉伸停留时间下的动态应变时效:宏观现象学研究A damage-coupled unified constitutive model is developed for 316LN stainless steel based on the framework of the Abdel-Karim and Ohno model. In the modified model, a kinematic hardening coefficient related to accumulated plastic strain is introduced in the linear hardening term, and a damage coefficient is incorporated in the static recovery term. Meanwhile, the parameters of isotropic hardening and kinematic hardening are associated with the maximum plastic strain rate and plastic strain memory to describe the effects of dynamic strain aging and plastic strain memory. Additionally, the kinematic hardening coefficients and static recovery coefficients correlate with dwell time to simulate stress relaxation throughout the whole-life time. The comparison between the simulation and experimental results indicates the validity of the modified model under the conditions of low-cycle fatigue and creep-fatigue interaction. After identifying the material parameters using a combination of classic parameter determination methods and optimization algorithms, the cyclic stress response and hysteresis loops can be accurately simulated throughout the whole-life time.在 Abdel-Karim 和 Ohno 模型的框架基础上,为 316LN 不锈钢建立了损伤耦合统一构成模型。在修改后的模型中,线性硬化项中引入了与累积塑性应变相关的运动硬化系数,静态恢复项中加入了损伤系数。同时,各向同性硬化和运动硬化参数与最大塑性应变速率和塑性应变记忆相关联,以描述动态应变老化和塑性应变记忆的影响。此外,运动硬化系数和静态恢复系数与停留时间相关,以模拟整个寿命期间的应力松弛。模拟结果与实验结果的对比表明,修改后的模型在低循环疲劳和蠕变-疲劳相互作用条件下是有效的。在结合使用经典参数确定方法和优化算法确定材料参数后,可精确模拟整个寿命周期内的循环应力响应和滞后环。Computer Methods in Applied Mechanics and EngineeringExplicit synchronous partitioned scheme for coupled reduced order models based on composite reduced basesde Castro Amy, Bochev Pavel, Kuberry Paul, Tezaur Irinadoi:10.1016/j.cma.2023.116398基于复合缩减基的耦合缩减阶模型的显式同步分区方案This paper formulates, analyzes and demonstrates numerically a method for the explicit partitioned solution of coupled interface problems involving combinations of projection-based reduced order models (ROM) and/or full order models (FOMs). The method builds on the partitioned scheme developed in Peterson et al. (2019), which starts from a well-posed formulation of the coupled interface problem and uses its dual Schur complement to obtain an approximation of the interface flux. Explicit time integration of this problem decouples its subdomain equations and enables their independent solution on each subdomain. Extension of this partitioned scheme to coupled ROM–ROM or ROM–FOM problems requires formulations with non-singular Schur complements. To obtain these problems, we project a well-posed coupled FOM–FOM problem onto a composite reduced basis comprising separate sets of basis vectors for the interface and interior variables, and use the interface reduced basis as a Lagrange multiplier. Our analysis confirms that the resulting coupled ROM–ROM and ROM–FOM problems have provably non-singular Schur complements, independent of the mesh size and the reduced basis size. In the ROM–FOM case, analysis shows that one can also use the interface FOM space as a Lagrange multiplier. We illustrate the theoretical and computational properties of the partitioned scheme through reproductive and predictive tests for a model advection–diffusion transmission problem.本文阐述、分析并数值演示了一种显式分区求解耦合界面问题的方法,该方法涉及基于投影的减阶模型(ROM)和/或全阶模型(FOM)的组合。该方法以 Peterson 等人(2019)开发的分区方案为基础,从耦合界面问题的拟合公式出发,利用其对偶舒尔补码获得界面通量的近似值。该问题的显式时间积分将其子域方程解耦,使其在每个子域上都能独立求解。将这种分区方案扩展到 ROM-ROM 或 ROM-FOM 耦合问题,需要使用非邢格舒尔补集的公式。为了求解这些问题,我们将问题解决得很好的耦合 FOM-FOM 问题投影到由界面和内部变量的独立基向量集组成的复合还原基上,并将界面还原基用作拉格朗日乘法器。我们的分析证实,由此产生的 ROM-ROM 和 ROM-FOM 耦合问题具有可证明的非奇异舒尔补全,与网格大小和还原基大小无关。在 ROM-FOM 的情况下,分析表明我们也可以使用界面 FOM 空间作为拉格朗日乘法器。我们通过对模型平流-扩散传输问题的再现和预测测试,说明了分区方案的理论和计算特性。Thin-Walled StructuresAnalytical Method for Deformation and Stress Calculation of Bell-and-spigot Joints in PVC-U PipesXue Xiang, Hu Shaowei, Shan Changxi, Qi Hao, Tian Xinrudoi:10.1016/j.tws.2023.111228聚氯乙烯(PVC-U)管道钟罩和插销接头的变形和应力计算分析方法The stable operation of water supply pipelines relies significantly on the structural safety of pipe joints. A novel analytical pipe joint structural calculation method based on the Novozhilov thin shell theory was proposed to calculate the deformation and stress of bell-and-spigot joints in unplasticized polyvinyl chloride (PVC-U) pipes under internal pressure. An equivalent stress index was established to investigate and evaluate the safety performance of pipe joints. The effects of various factors, including spigot insertion depth, the clearance between the bell and spigot, internal pressure, and different pipe nominal outside diameter (DN) and nominal pressure (PN) series, on the maximum equivalent stress of pipe joints, were thoroughly analyzed. The results indicate that the maximum equivalent stress under nominal pressure is located on the inner surface of the bell and consistently exceeds the design stress. The influence of spigot insertion depth on the maximum equivalent stress is minimal. However, as the clearance value between the bell and spigot decreases and the internal pressure increases, the maximum equivalent stress increases significantly. Pipes with smaller DN and PN series result in a higher maximum equivalent stress at the joint. The analytical method indicates that increasing pipe thickness and reinforcing the bell with continuous carbon fiber filament winding are two potentially effective methods to enhance the mechanical performance of the joint and reduce the maximum equivalent stress. This study&#39;s findings offer valuable theoretical support for designing and selecting joints in PVC-U pipelines.供水管道的稳定运行在很大程度上取决于管道接头的结构安全。基于诺沃日洛夫薄壳理论,提出了一种新的管道接头结构分析计算方法,用于计算未塑化聚氯乙烯(PVC-U)管道中喇叭口接头在内部压力作用下的变形和应力。建立了等效应力指数,用于研究和评估管道接头的安全性能。深入分析了各种因素,包括拉钉插入深度、喇叭口与拉钉之间的间隙、内压以及不同管道公称外径 (DN) 和公称压力 (PN) 系列对管道接头最大等效应力的影响。结果表明,公称压力下的最大等效应力位于喇叭口内表面,且持续超过设计应力。拉钉插入深度对最大等效应力的影响很小。但是,随着喇叭口和拉钉间间隙值的减小以及内压的增加,最大等效应力会显著增加。DN 和 PN 系列较小的管道会导致接头处的最大等效应力增大。分析方法表明,增加管道厚度和用连续碳纤维丝缠绕加固喇叭口是提高接头机械性能和降低最大等效应力的两种潜在有效方法。这项研究结果为设计和选择 PVC-U 管道接头提供了宝贵的理论支持。来源:复合材料力学仿真Composites FEM

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