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Stability of a Composite Plate in a High-Enthalpy Gas Flow 复合板在高焓气体流中的稳定性
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700990
B. A. Antuf’ev, A. A. Orekhov, U. S. Tsareva

Abstract

The divergence of a thin elastic plate reinforced by stiff ribs (stringers) with cyclic symmetry is considered, with some approximations. The incoming air flow is assumed to be supersonic, and so the aerodynamic load is described by means of approximate piston theory, for a steady temperature field. In taking account of the composite structure, attention is paid to the configuration of the stiffening ribs; a contact formulation is adopted. The lower critical velocity of the incoming air flow is determined by the first approximation, and its dependence on the number of stiffening ribs is investigated. It is shown numerically that, with increase in the distance between the ribs, the critical rate of divergence approaches its value for a smooth plate.

摘要 通过一些近似值，考虑了由具有周期对称性的刚性肋条（弦杆）加固的弹性薄板的发散问题。假设进入的气流是超音速的，因此气动载荷是通过近似活塞理论来描述稳定温度场的。在考虑复合结构时，注意了加强筋的配置；采用了接触式公式。通过第一近似法确定了进入气流的下临界速度，并研究了其与加劲肋条数量的关系。数值结果表明，随着加劲肋条间距的增加，临界发散速度接近光滑板的数值。
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引用次数: 0
New Approach to Preventing External Overheating of High-Speed Aircraft 防止高速飞机外部过热的新方法
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700904
V. F. Formalev, S. A. Kolesnik, B. A. Garibyan, O. A. Pashkov, E. A. Pegachkova

Abstract

External overheating of high-speed aircraft may be prevented by means of composites with significant longitudinal anisotropy. (The longitudinal thermal conductivity is two orders of magnitude greater than the transverse thermal conductivity.) In this approach, the heat fluxes that result from aerodynamic heating are channeled within the anisotropic composites from the hottest region (the front critical point) to the tail of the truncated cone. As a result, the vicinity of the front critical point is cooled and the tail of the cone is heated, with considerable decrease in the associated heat fluxes.

摘要 利用具有显著纵向各向异性的复合材料可以防止高速飞机的外部过热。(纵向热导率比横向热导率大两个数量级）。在这种方法中，气动加热产生的热通量会在各向异性复合材料内从最热区域（前临界点）流向截顶锥的尾部。因此，前临界点附近被冷却，锥体尾部被加热，相关的热通量大大减少。
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引用次数: 0
Stress-Strain Analysis of the Initial Material of Workpieces during Broadening Extrusion 拓宽挤压过程中工件初始材料的应力应变分析
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700813
P. A. Ermolenkov, A. S. Gusev, E. Yu. Remshev

Abstract

The stress-strain state of the workpiece material during plastic deformation with broadening extrusion, which is used to improve the mechanical characteristics of materials in the form of rods and wires of blank production, is calculated analytically. The analysis has shown the technological feasibility of using broadening extrusion for wires made of different materials in order to increase their initial strength.

摘要 分析计算了工件材料在加宽挤压塑性变形过程中的应力应变状态，加宽挤压用于改善坯料生产中棒材和线材形式材料的机械特性。分析表明，对不同材料制成的线材采用加宽挤压以提高其初始强度在技术上是可行的。
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引用次数: 0
Dynamics of Composite Cylindrical Panels with Honeycomb Filler after Internal Damage by Aircraft Engine Jet 带蜂窝填料的复合材料圆柱板在受到航空发动机喷气机内部损伤后的动力学特性
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700953
L. N. Rabinskiy, M. I. Martirosov, D. V. Dedova, A. V. Khomchenko

Abstract

The influence of defects (splitting) on the stress–strain state of a three-layer cylindrical panel under the action of an aircraft engine jet is studied numerically, by the finite-element method. Two versions of honeycomb filler are considered. The polymer’s sheathing consists of individual polymer composite layers. Results for panels with and without defects are compared.

摘要 通过有限元方法，对飞机发动机喷流作用下三层圆柱形面板的应力-应变状态的缺陷（分裂）影响进行了数值研究。研究考虑了两种蜂窝状填料。聚合物护套由单个聚合物复合层组成。比较了有缺陷和无缺陷面板的结果。
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引用次数: 0
Influence of the Thermal Expansion of Carbon–Carbon Composites on Their Tribological Stability 碳碳复合材料的热膨胀对其摩擦稳定性的影响
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700771
I. Yu. Tsukanov, A. N. Lyubicheva, P. O. Bukovskiy

Abstract

The influence of the thermal expansion of carbon–carbon composite disks on their tribological stability in a frictional pair with an annular ceramic counterbody is studied theoretically and experimentally. The thermal characteristics of composites with fibrous and fabric structure are investigated. Experimental time dependences of the load in frictional heating are compared with a model corresponding to the mechanics of contact interaction. The relation between the rigidity of the interface and the temperature dependence of the thermal expansion coefficient is determined for various materials. In the initial stage, wear of the fabric composite is found to be nonuniform, with destruction of fabric layers and breakaway of structural components.

摘要 通过理论和实验研究了碳-碳复合材料盘在与环形陶瓷对体的摩擦对中的热膨胀对其摩擦稳定性的影响。研究了纤维结构和织物结构复合材料的热特性。摩擦加热载荷的实验时间相关性与接触相互作用力学模型进行了比较。确定了各种材料的界面刚度与热膨胀系数随温度变化的关系。在初始阶段，发现织物复合材料的磨损是不均匀的，织物层被破坏，结构组件断裂。
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引用次数: 0
Peeling of Polymer Coating from a Substrate: Analysis as a Binary Composite 聚合物涂层从基底剥离：二元复合材料分析
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700801
I. K. Arkhipov, S. I. Koryagin, V. I. Abramova

Abstract

The failure of the adhesive bond between a substrate and a polymer coating may be analyzed on the basis of findings in the failure mechanics of binary composites. On that basis, the relation between the destructive normal and tangential stresses and the linear concentration of the initial cracks is determined.

摘要 可根据二元复合材料失效力学的研究结果来分析基体和聚合物涂层之间粘合剂的失效。在此基础上，确定了破坏性法向和切向应力与初始裂纹线性集中之间的关系。
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引用次数: 0
Methodology for Preliminary Assessment of Design Parameters of Suction Valve and Discharge Valve of a Piston Hybrid Energy Machine of Volumetric Action with Regenerative Heat Exchange 带再生热交换的容积式混合能源机吸入阀和排出阀设计参数的初步评估方法
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700758
V. E. Shcherba, E. V. Khodoreva, E. A. Dorofeev

Abstract

A method for preliminary assessment of the ratio of the flow sections areas of the suction and discharge valves in a piston hybrid energy machine with regenerative heat exchange when operating in pump and compressor modes at a constant angular velocity of the crankshaft is developed. It is shown that this ratio in pump mode should be twice as large as in compressor mode. The basic designs of self-acting valves in piston compressors and piston pumps are considered. Options for improving the designs of suction and discharge valves of piston hybrid energy volumetric machines with regenerative heat exchange are proposed.

摘要 开发了一种方法，用于初步评估具有再生热交换功能的活塞式混合能源机在曲轴角速度恒定的情况下，以泵和压缩机模式运行时，吸气阀和排气阀的截流面积之比。结果表明，在泵模式下，该比率应是压缩机模式下的两倍。考虑了活塞压缩机和活塞泵中自力式阀门的基本设计。提出了改进具有再生热交换功能的活塞式混合能量容积机器吸气阀和排气阀设计的方案。
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引用次数: 0
Considerations on the Study of the Mechanism of Delamination of a Steel Plate Reinforced with Carbon Nanotubes during the Pull-Out Test 对碳纳米管增强钢板在拉拔试验中分层机理研究的思考
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700928
G. I. Kriven’, E. S. Senina, D. S. Shavelkin

Abstract

The study investigates the process of delamination of a steel plate from the matrix during the pull-out test. Experimental results are obtained for two types of specimens—unreinforced and reinforced steel plates. The reinforced plate is coated with a thin layer of carbon nanotubes on one of its surfaces. The results of the experiment reveal that the load under which the reinforced plate delaminates from the matrix block is over 150% greater than that value for the unreinforced plate. The load-displacement curves demonstrate several characteristic phases preceding complete delamination—elastic strain phase, fracture phase, and friction sliding phase. Considerations on determining the interfacial strength, as well as effective properties of the reinforced plate and catastrophic delamination lengths, are presented.

摘要 本研究探讨了钢板在拉拔试验过程中与基体分层的过程。实验结果针对两种类型的试样--未加固钢板和加固钢板。加固钢板的一个表面涂有一薄层碳纳米管。实验结果表明，加固钢板从基体块脱落的荷载比未加固钢板的荷载大 150%以上。载荷-位移曲线显示了完全脱层之前的几个特征阶段--弹性应变阶段、断裂阶段和摩擦滑动阶段。本文介绍了在确定界面强度、增强板的有效特性和灾难性分层长度方面的考虑因素。
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引用次数: 0
Experimental Researches on the Conductivity of Shock Impacts from Track Sled Supports to Products during Supersonic Tests 超音速试验中轨道雪橇支架对产品的冲击传导性实验研究
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700874
S. A. Astakhov, V. I. Biryukov

Abstract

The paper presents the methodology and results of experimental studies of vibrations and shock effects perceived by sliding supports during high-speed track tests of aircraft and their elements. Fire launches of the developed two-rail rocket carriage with vibration sensors spaced along the carriage elements from the sliding supports to the test object were carried out. The obtained results were processed by statistical analysis methods. Recommendations have been developed to reduce the amplitude of shocks and vibration loads acting on supports, the carriage itself and objects during high-speed tests.

摘要 本文介绍了对飞机及其部件进行高速轨道测试期间滑动支撑所感受到的振动和冲击效应进行实验研究的方法和结果。对所开发的双轨火箭车厢进行了火力发射，从滑动支架到测试对象，沿车厢元件间隔安装了振动传感器。获得的结果通过统计分析方法进行了处理。提出了一些建议，以减少高速试验期间作用在支架、火箭车厢本身和物体上的冲击和振动载荷的振幅。
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引用次数: 0
Research of the Impact of SLM Printing Parameters on Residual Deformation Levels in Aluminum Products SLM 印刷参数对铝制品残余变形水平的影响研究
Q3 Engineering
Russian Engineering Research
Pub Date : 2024-06-26 DOI: 10.3103/s1068798x24700965
A. V. Babaytsev, S. A. Shumskaya, A. V. Ripetskiy

Abstract

A significant limitation for application in industry of final products obtained by selective laser fusion technology is the formation of residual stresses due to temperature gradients during the formation of layers, which can lead to undesirable deformations of the product, cracks or tearing off of layers in the printing process. The main method of reducing residual stresses is tempering. However, this method does not always contribute to a complete reduction of residual strains. Another, less studied, method can be accomplished by varying the printing process parameters. This approach is particularly effective when residual stresses are accumulated locally due to the geometric shape of the printed object or due to the peculiarities of their arrangement in the 3D printer chamber. In this paper we study the influence of layer-by-layer synthesis parameters on the level of residual stresses in the products obtained by selective laser fusion technology. The probing hole method using digital image correlation was used to estimate the residual strain level. Based on the test results, the residual stress level was evaluated depending on the printing mode.

摘要 通过选择性激光熔融技术获得的最终产品在工业应用中的一个重要限制是，在层的形成过程中，由于温度梯度会形成残余应力，这可能会导致产品在印刷过程中出现不理想的变形、裂缝或层的撕裂。减少残余应力的主要方法是回火。然而，这种方法并不总能完全减小残余应变。另一种研究较少的方法是改变印刷工艺参数。当残余应力因打印对象的几何形状或其在三维打印机腔内的特殊布置而在局部累积时，这种方法尤为有效。在本文中，我们研究了逐层合成参数对通过选择性激光熔融技术获得的产品中残余应力水平的影响。采用数字图像相关的探孔法估算残余应变水平。根据测试结果，评估了不同印刷模式下的残余应力水平。
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