Strength of Materials最新文献_第3页

Degradation of Ship Pipe Metal Due to Long-Term Operation 长期运行导致的船管金属退化

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-29 DOI: 10.1007/s11223-024-00648-2

V. D. Makarenko, O. E. Chygyrynets, Yu. L. Vynnykov, V. I. Gots, S. Yu. Maksymov, V. V. Pipa, Yu. V. Makarenko

{"title":"Degradation of Ship Pipe Metal Due to Long-Term Operation","authors":"V. D. Makarenko, O. E. Chygyrynets, Yu. L. Vynnykov, V. I. Gots, S. Yu. Maksymov, V. V. Pipa, Yu. V. Makarenko","doi":"10.1007/s11223-024-00648-2","DOIUrl":"https://doi.org/10.1007/s11223-024-00648-2","url":null,"abstract":"Previous studies have shown that with increasing service life of shipbuilding steels, a strong hydrogen charging of their internal near-surface layers occurs, especially if the service life exceeds 3 years or more. This is known to cause changes in the mechanical properties of steels. Therefore, there is a need to conduct additional experimental studies on the effect of hydrogen in a wide temperature range on the degradation of the structural and phase states of steels, in particular, on changes in the crystal lattice and redistribution of cementite, which directly leads to a decrease in the ductile and deformation properties of the metal, especially at subzero air temperatures. The effect of service life and subzero temperatures on the stress state of the a-matrix lattice and its parameters for the 10KhSND and D32 steels was investigated. A tendency to increase in the value of lattice distortion stresses and decrease in the mass fraction of cementite in specimens of these steels after long-term operation was revealed. Metallographic studies showed that with decrease in the temperature of the cooling medium, the volume fraction of hydrides increases significantly, which leads to embrittlement and softening of steels.","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"23 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermo-Fluid-Solid Coupling Analysis on the Hot Water Pipeline in the Nuclear Reactor Water System 核反应堆水系统中热水管道的热流体-固体耦合分析

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-29 DOI: 10.1007/s11223-024-00653-5

Z. J. Sun, J. T. Dai, H. D. Liu, L. F. Qu

引用次数: 0

Critical Plane Approach-Based Fatigue Life Prediction for Multiaxial Loading: A New Model and its Verification 基于临界面法的多轴载荷疲劳寿命预测：新模型及其验证

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-29 DOI: 10.1007/s11223-024-00647-3

P. V. Yakovchuk, E. V. Savchuk, S. M. Shukayev

引用次数: 0

Effect of Heat Treatment on the Microstructure and Vickers Hardness of Aluminum Alloy Gradient Plate Prepared Through Friction Stir Processing 热处理对摩擦搅拌加工制备的铝合金梯度板显微组织和维氏硬度的影响

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-29 DOI: 10.1007/s11223-024-00652-6

W. W. Song, J. F. Pu, D. Jiang, X. L. Ge, Q. Dong, H. F. Wang

{"title":"Effect of Heat Treatment on the Microstructure and Vickers Hardness of Aluminum Alloy Gradient Plate Prepared Through Friction Stir Processing","authors":"W. W. Song, J. F. Pu, D. Jiang, X. L. Ge, Q. Dong, H. F. Wang","doi":"10.1007/s11223-024-00652-6","DOIUrl":"https://doi.org/10.1007/s11223-024-00652-6","url":null,"abstract":"Aluminum alloy plates with varying properties were prepared through the superposition friction stir processing of three different aluminum alloys with friction stir joining technology and subjected to solid solution aging. Experimental results showed that friction stir joining yielded a relatively smooth aluminum alloy surface gradient change plate. The plate surface presented a circular superposition trajectory with a clear outline and a rough surface with a flying edge during preparation. The three superimposed aluminum alloy plates achieved good fusion. In particular, fusion was most evident between the uppermost 5052 aluminum alloy and the middle layer of the 6061 aluminum alloy. The fusion of the middle layer of the 6061 aluminum alloy and the lower layer of the 7075 aluminum alloy weakened, and an obvious dividing line was observed. The average Vickers hardness values of the uppermost and undersurfaces of the samples heat-treated at 540°C were the highest, which were 1.34 and 119.06% higher than those of the samples without heat treatment, respectively. The most notable cross-section Vickers hardness gradient was obtained at the solution temperature of 500°C.","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"46 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Personnel Protection Armor Strength Enhancement by Nested Structures 通过嵌套结构增强人员防护装甲强度

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-29 DOI: 10.1007/s11223-024-00651-7

A. V. Kovtun, V. O. Tabunenko, S. I. Nesterenko

{"title":"Personnel Protection Armor Strength Enhancement by Nested Structures","authors":"A. V. Kovtun, V. O. Tabunenko, S. I. Nesterenko","doi":"10.1007/s11223-024-00651-7","DOIUrl":"https://doi.org/10.1007/s11223-024-00651-7","url":null,"abstract":"The Armed Forces of Ukraine pay great attention to the development of personnel protection armor. However, despite the availability of protective equipment, the practice of warfare shows that the tasks of protecting military personnel are not fully resolved. The task of developing protective structures against bullets and shrapnel remains urgent. The analysis of scientific and technical information showed that the processes that occur during the impact interaction of elements of mechanical systems have not been fully studied, and the development of means to protect against kinetic damage has not been fully covered in scientific papers. The process of interaction between the impactor and the protective barrier may change if nested structures are used as a protective barrier. The possibility of developing a new method for increasing the strength of armor protection by using nested structures (bullet–cylinder) is investigated. A new analytical dependence for determining the depth of penetration of a bullet into a cylinder is obtained. The novelty of the analytical dependence lies in the absence in the scientific literature of a mathematical model of bullet penetration into a cylinder whose inner diameter is smaller than the outer diameter of the bullet, taking into account the effective friction coefficient between the bullet and the inner surface of the cylinder, and the fact that the depth of penetration of a bullet into a cylinder can be equal to the length of the bullet, or be greater or less than it. On the basis of the proposed analytical dependence for determining the depth of penetration of a bullet into a cylinder, the dependences of the depth of penetration of a bullet into a cylinder on the value of tension (between the bullet and the cylinder) and the thickness of the cylinder are constructed. The research results indicate the fundamental possibility of reducing the depth of penetration of a bullet by using nested structures.","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"14 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of Image Analysis Technique in Visualization of Failure During the Testing Of Materials 图像分析技术在材料测试过程中故障可视化中的应用

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-29 DOI: 10.1007/s11223-024-00658-0

H. Rupani, J. T. Chavda

{"title":"Application of Image Analysis Technique in Visualization of Failure During the Testing Of Materials","authors":"H. Rupani, J. T. Chavda","doi":"10.1007/s11223-024-00658-0","DOIUrl":"https://doi.org/10.1007/s11223-024-00658-0","url":null,"abstract":"In experimental investigations, conventional measuring instruments such as dial gauges, linear variable differential transformers, and extensometers are used to measure the displacement at a specific gauge length (i.e., global deformation). They are contact-based instruments which are not able to evaluate the displacements within the gauge length (i.e., localized deformations). The image analysis techniques are able to evaluate the displacements at each point within the gauge length. In the present study, the applicability and effectiveness of the image analysis technique are assessed for four different materials, i.e., concrete, steel, wood, and geomembrane which are widely used in the field of geotechnical engineering as construction material for geo-structures. For this, four different tests, i.e., compression testing of the concrete cube, tensile testing of the steel plate and wooden strip, and wide-width tensile testing of the geomembrane are performed in a systematic manner. The image analysis technique is used to evaluate the displacement fields for each material under given loading conditions. The results obtained from the image analysis technique are compared with those of conventional measuring instruments to emphasize the applicability and effectiveness of the image analysis technique for different materials having different properties.","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"74 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modernization of the VK-350 Instrumented Drop Weight Impact Testing Machine for Impact Testing of Various Types 用于各种类型冲击试验的 VK-350 型仪器式落下砝码冲击试验机的现代化改造

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-29 DOI: 10.1007/s11223-024-00650-8

A. V. Kravchuk, E. A. Kondryakov, V. N. Zhmaka, V. V. Kharchenko

{"title":"Modernization of the VK-350 Instrumented Drop Weight Impact Testing Machine for Impact Testing of Various Types","authors":"A. V. Kravchuk, E. A. Kondryakov, V. N. Zhmaka, V. V. Kharchenko","doi":"10.1007/s11223-024-00650-8","DOIUrl":"https://doi.org/10.1007/s11223-024-00650-8","url":null,"abstract":"This study conducted modernization of the VK-350 instrumented drop weight impact testing machine (DWITM) developed at the Pisarenko Institute of Problems of Strength of the National Academy of Sciences of Ukraine, equipped with a high-speed strain and force recording system that allows recording a load diagram with a sampling rate of up to 20 MHz, and heating and cooling systems for testing specimens in a wide temperature range. Modernization was carried out to expand the functionality of the DWITM, namely, a new dynamometer and specimen fixing units for impact shear, compression and dynamic pushing tests were installed. The new dynamometer was calibrated for two ranges of amplification and test specimens of various types were tested. The DWITM was also equipped with a video recording system, which includes a high-speed PHOTRON FASTCAM NOVA S9 camera that allows recording the deformation and fracture process at a speed of up to 200,000 frames per second. The camera is equipped with a 12x zoom lens and stroboscopic high-frequency lamps for illumination with the GSVITEC MultiLED G8 control system. Based on the results of the impact bending and shear tests, video signals of the deformation and fracture of the specimens were obtained, which made it possible to determine the time of onset of plastic deformation and formation of adiabatic shear zones in the impact shear specimens, as well as the moment of crack appearance on the side surface of the Charpy specimen and to estimate the rate of its propagation.","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"296 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141873313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of Static and Fatigue Characteristics of Thermoplastic CF-UD/PEKK Material for Rotorcraft Lug Parts 用于旋翼机吊耳部件的热塑性 CF-UD/PEKK 材料的静态和疲劳特性研究

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-26 DOI: 10.1007/s11223-024-00655-3

U. G. Çakıcı, R. E. Ece, S. Toros, T. Apatay, B. Yıldırım

{"title":"Investigation of Static and Fatigue Characteristics of Thermoplastic CF-UD/PEKK Material for Rotorcraft Lug Parts","authors":"U. G. Çakıcı, R. E. Ece, S. Toros, T. Apatay, B. Yıldırım","doi":"10.1007/s11223-024-00655-3","DOIUrl":"https://doi.org/10.1007/s11223-024-00655-3","url":null,"abstract":"In rotary wing aircraft, composite lug structures are perforated structures that connect the rotor and blades. They play a significant structural role in rotary wing aircraft. In this study the effect of lay-up parameters on mechanical strength of a thick composite part that represents a blade root. This part is autoclave manufactured polyetherketoneketone matrix carbon fiber reinforced (CF/PEKK) composites, which have recently been researched for usage in defense and aerospace is investigated. The chosen material carbon-fiber-reinforced polyetherketoneketone composites (CF-PEKK) have an excellent mechanical, physical, thermal performance. Aerospace sector has a special interest on this material due to material’s low density and versatility. In this study, static and fatigue performance of rotorcraft lug part were investigated by applying non-destructive-test (NDT) methods and the mechanical strength values were discussed according to the experimental results. It has been observed that the component parts with ∓45° layup has the highest mechanical strength. As a result of the static and fatigue tests, it is seen that satisfactorily performance in the view of the both static and dynamic loading states.","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"24 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Prediction of Strain Hardening and Durability Based on the Calculated Non-Proportional Cyclic Hardening Coefficient 根据计算得出的非比例循环硬化系数预测应变硬化和耐久性

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-26 DOI: 10.1007/s11223-024-00646-4

M. V. Borodii

{"title":"Prediction of Strain Hardening and Durability Based on the Calculated Non-Proportional Cyclic Hardening Coefficient","authors":"M. V. Borodii","doi":"10.1007/s11223-024-00646-4","DOIUrl":"https://doi.org/10.1007/s11223-024-00646-4","url":null,"abstract":"The effectiveness of the previously proposed improved approach for determining the non-proportional cyclic hardening coefficient in predicting the maximum level of strain hardening and durability of metallic materials was tested. The approach is based on the correlation between static and cyclic strain hardening of metallic materials, takes into account the amplitude of cyclic deformation, and does not require fatigue experiments under non-proportional loading. The calculated and experimental values of this coefficient were compared for structural materials with different cyclic and physical properties. For the 27 analyzed materials, the maximum level of strain hardening was predicted using the obtained calculated coefficient, and a good agreement with experimental data was demonstrated. Using the strain criterion for assessing durability, which includes the calculated non-proportional cyclic hardening coefficient, the durability for circular cyclic trajectories of non-proportional deformation was predicted on the basis of the basic uniaxial fatigue diagram. Satisfactory results of durability prediction (in comparison with the experiment) were obtained for materials with FCC metal lattice structure. For materials with BCC structure, the agreement between the calculated and experimental data was somewhat worse. It is shown that for this type of materials, the use of an alternative method for determining the non-proportional cyclic hardening coefficient can improve the results of durability prediction.","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"62 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of a Procedure for Determining the Brinell Hardness of Structural Steels Based on the Results of Instrumented Indentation 根据仪器压痕结果改进测定结构钢布氏硬度的程序

IF 0.7 4区材料科学

Strength of Materials Pub Date : 2024-07-24 DOI: 10.1007/s11223-024-00649-1

O. A. Katok, R. V. Kravchuk, A. V. Sereda, M. P. Rudnytskyi, V. V. Kharchenko

{"title":"Improvement of a Procedure for Determining the Brinell Hardness of Structural Steels Based on the Results of Instrumented Indentation","authors":"O. A. Katok, R. V. Kravchuk, A. V. Sereda, M. P. Rudnytskyi, V. V. Kharchenko","doi":"10.1007/s11223-024-00649-1","DOIUrl":"https://doi.org/10.1007/s11223-024-00649-1","url":null,"abstract":"Using the created experimental equipment for testing metals by the method of instrumented indentation, a procedure for determining Brinell hardness during the nondestructive testing of structural elements has been developed. In contrast to the conventional method, the hardness is determined by the proposed procedure using the proportionality parameter of plastic indentation, a, which is equal to the slope of the instrumented indentation diagram in the coordinates maximum force of cycle Fmax – residual indentation depth hp after removing the test load of this cycle. Based on the results of a series of tests by the method of instrumented indentation of hardness standards, a linear correlation dependence was obtained between the Brinell hardness value and the proportionality parameter of plastic indentation in a wide range of measured hardness values of 110–650 HBW. The peculiarities of using this procedure and its limitations are analyzed on a number of structural carbon, heat-resistant, and high-strength steels. It is shown that the Brinell hardness measurement results, obtained by the improved procedure, agree within the permissible error with the results of the conventional DSTU ISO 6506-1:2019 method. The difference between their values does not exceed 3.9%. The presented improved procedure can be used in the laboratories of research and educational institutes, central factory laboratories and specialized divisions of various subordination, and other organizations involved in monitoring the condition of the operating critical equipment and setting its further service life both in the laboratory and in the field.","PeriodicalId":22007,"journal":{"name":"Strength of Materials","volume":"66 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141785511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0