Analysis of the Cyclic Strength of Technical Systems under Complex Operating Loading Conditions

IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY
N. A. Makhutov, M. M. Gadenin, O. N. Yudina
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Abstract

The main cyclic thermomechanical and relevant time-variable vibration and aero-hydrodynamic loadings affect modern energy facilities and space, air, water, and land transport during their operation. The total number of loading cycles with allowance for the operating time turns out to vary within very wide limits. It has been shown that a general time range of loads affecting the aforementioned objects appears to be very complex in terms of load levels, frequencies, and action times. Taking into account a wide variation of service impacts in the loading level, frequency, and total number of loading cycles, the general analysis of the resistance to deformation, damage, and fracture of highly loaded modern technical objects has been carried out. The results obtained have shown that, under combined mechanical, vibration, and aero-hydrodynamic loadings, the limit state, by the cyclic strength criteria with the use of the rule of linear summation of damage expressed in deformation parameters, will be attained earlier than in the case when only the main thermomechanical loading is taken into account. To substantiate the strength and operating life of the investigated objects, standard and unified mechanical isothermal tests for static and cyclic loading have been performed to determine the basic mechanical properties of a material, and special mechanical programmed tests with variable modes simulating complex operational thermomechanical, vibration, and aero-hydrodynamic impacts have been carried out. The results of these tests are used in the computational and experimental estimations of the strength and durability for the corresponding spectra of operational loads. A refined verification calculation of the cyclic strength and durability is becoming increasingly relevant for modern machines operating under the conditions of increasing speeds of movement, operating pressures with increased levels of pulsation, and accompanying mechanical oscillations, vibrations, and aero-hydroacoustic impacts.

Abstract Image

复杂工作负载条件下技术系统的循环强度分析
摘要 现代能源设施以及空间、空中、水上和陆地运输在运行过程中会受到主要的周期性热机械和相关时变振动以及空气流体动力载荷的影响。考虑到运行时间,加载循环的总次数变化范围非常大。研究表明,影响上述物体的一般载荷时间范围在载荷水平、频率和作用时间方面显得非常复杂。考虑到服务影响在加载水平、频率和加载周期总数方面的巨大差异,我们对高负载现代技术物体的抗变形、抗损坏和抗断裂能力进行了总体分析。分析结果表明,在机械、振动和空气流体动力的综合载荷作用下,根据循环强度标准,并使用以变形参数表示的损伤线性求和规则,将比只考虑主要热机械载荷的情况下更早达到极限状态。为了证实研究对象的强度和使用寿命,我们进行了标准和统一的静态和循环加载机械等温试验,以确定材料的基本机械性能,还进行了具有可变模式的特殊机械程序试验,以模拟复杂的运行热机械、振动和空气流体动力冲击。这些测试结果被用于计算和实验估算相应工作载荷频谱下的强度和耐久性。对循环强度和耐久性进行精细的验证计算,对于在运动速度不断提高、工作压力和脉动水平不断增加、伴随着机械振动、振动和空气-流体-声学冲击的条件下运行的现代机器来说越来越重要。
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来源期刊
Inorganic Materials
Inorganic Materials 工程技术-材料科学:综合
CiteScore
1.40
自引率
25.00%
发文量
80
审稿时长
3-6 weeks
期刊介绍: Inorganic Materials is a journal that publishes reviews and original articles devoted to chemistry, physics, and applications of various inorganic materials including high-purity substances and materials. The journal discusses phase equilibria, including P–T–X diagrams, and the fundamentals of inorganic materials science, which determines preparatory conditions for compounds of various compositions with specified deviations from stoichiometry. Inorganic Materials is a multidisciplinary journal covering all classes of inorganic materials. The journal welcomes manuscripts from all countries in the English or Russian language.
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