Mechanics of Solids最新文献_第8页

Fatigue Strength under High Frequency Loading of Materials Produced by Selective Laser Melting

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424604762

I. S. Nikitin, N. G. Burago, A. D. Nikitin, B. A. Stratula

{"title":"Fatigue Strength under High Frequency Loading of Materials Produced by Selective Laser Melting","authors":"I. S. Nikitin, N. G. Burago, A. D. Nikitin, B. A. Stratula","doi":"10.1134/S0025654424604762","DOIUrl":"10.1134/S0025654424604762","url":null,"abstract":"The mathematical modeling of the selective laser melting process of metallic alloy powders for the construction of metal products has been carried out within the framework of the enthalpy formulation of the three-dimensional non-stationary nonlinear heat conductivity problem for a multiphase system. The parameters of the geometry of a single track, as well as single-layer and multilayer systems of overlapping tracks, depending on the power and speed of the laser beam have been determined that makes it possible to estimate the structure and types of defects occuring during layer-by-layer printing of specimens. To study the effect of single and multiple defects on the fatigue behavior of printed specimens under high-frequency loading, the previously proposed multi-mode model of cyclic damage has been used. It is shown that the internal heterogeneity of the microstructure of materials printed by selective laser melting can lead to earlier subsurface nucleation of fatigue cracks and significantly reduce the fatigue strength and durability. This effect is more pronounced for systems of multiple defects. The proposed models and calculation algorithms allow us to calculate the fatigue strength and durability of specimens for various systems of microstructure defects corresponding to the specified characteristics of a moving laser beam, as well as to determine the range of parameters of the selective laser melting process, in which the best fatigue strength indicators are achieved under high-frequency loading.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":"59 5","pages":"2789 - 2805"},"PeriodicalIF":0.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual-Phase-Lag Model on Reflection of P- and SV- Magneto-Thermoelastic Waves from Isothermal Boundary of a Half-Space

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424604567

S. M. Abo-Dahab, A. E. Abouelregal, Maha M. Helmi, A. M. Abd-Alla, Mnahil M. Bashier

引用次数: 0

Healing of Long Fatigue Cracks in Steel Plates by High-Density Current Pulses

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424605949

K. V. Kukudzhanov, G. R. Khalikova, E. A. Korznikova, A. V. Chentsov, S. V. Dmitriev

{"title":"Healing of Long Fatigue Cracks in Steel Plates by High-Density Current Pulses","authors":"K. V. Kukudzhanov, G. R. Khalikova, E. A. Korznikova, A. V. Chentsov, S. V. Dmitriev","doi":"10.1134/S0025654424605949","DOIUrl":"10.1134/S0025654424605949","url":null,"abstract":"The healing of cracks in metals and alloys by means of exposure to strong pulsed electromagnetic fields is of considerable interest, since it allows to increase the reliability and service life of structural materials and products made of them. In spite of practical importance, the methodology of selection of the parameters of the electric pulse treatment, which would allow to heal the defects, has not been developed yet. Healing of long macrocracks in thin plates by welding of their edges under electric pulse action is of particular difficulty. The present work is devoted to the study of the possibility of selecting the parameters of electric pulse treatment for such a case. The mechanism of healing of macrocracks in flat specimens is considered. The proposed multistage method of electric pulse treatment allowed to heal a significant length of macrocrack in a steel plate. The conducted studies of microstructure of cross-sections of AISI201 stainless steel samples confirm that healing occurs by the mechanism of welding of crack edges by molten material. The electric pulse creates at the tip of the crack significant compressive stress and high temperature, causing the melting of steel. The experiments showed significant heterogeneity of healing along the macrocrack front and in depth, however, the quality of healing improved with increasing distance from the plate surface. In the healed region along the crack edges, a zone with elongated grains surrounding a central zone with equiaxed grains is observed, which reflects the kinetics of cooling of the molten region of the specimen exposed to the current pulse.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":"59 5","pages":"3223 - 3234"},"PeriodicalIF":0.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of Photothermal Interactions in Semiconductor Media with Energy Dissipation

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424605494

Aatef Hobiny, Ibrahim Abbas

引用次数: 0

Quasi-3d Shear Deformation Theory for the Vibration Study of Viscoelastic FGM Nanoplates Resting on Visco Winkler-Pasternak Substrate Medium

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424604968

S. Hamzi, D. Ghali, I. Mechab, B. Mechab, N. Elmeiche

{"title":"Quasi-3d Shear Deformation Theory for the Vibration Study of Viscoelastic FGM Nanoplates Resting on Visco Winkler-Pasternak Substrate Medium","authors":"S. Hamzi, D. Ghali, I. Mechab, B. Mechab, N. Elmeiche","doi":"10.1134/S0025654424604968","DOIUrl":"10.1134/S0025654424604968","url":null,"abstract":"This study provides an analysis of the free vibration of functionally graded nano-plates with variable parameters resting on viscoelastic foundations using quasi three-dimensional shear deformation theory. The plate is assumed to be made of a functionally graded material with visco-elastic behavior resting on a visco-elastic foundation to reduce the vibration of the plate. The scaling effect is induced by Erigin’s nonlocal model and Kelvin–Voigt’s visco-elastic behavior are applied to define the equilibrium equations of the system. A new shear function is proposed to calculate the fundamental frequencies. A detailed parametric study is then carried out to examine the effects of non-local parameters, the viscoelastic foundation and internal damping on the vibration characteristics of the visco-elastic nano-plates are also presented and discussed in detail. The present solutions are in good agreement with those found in the literature. We note that the various parameters studied in this work have a significant effect on the durability of the structure.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":"59 5","pages":"3108 - 3127"},"PeriodicalIF":0.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of Stiffener Configurations on the Bending Behavior of Thin Stainless-Steel Plates: Experimental and Numerical Study

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424605123

M. Hamadi, A. Zatar, A. M. Al-Nadhari, D. Hamadi

{"title":"Impact of Stiffener Configurations on the Bending Behavior of Thin Stainless-Steel Plates: Experimental and Numerical Study","authors":"M. Hamadi, A. Zatar, A. M. Al-Nadhari, D. Hamadi","doi":"10.1134/S0025654424605123","DOIUrl":"10.1134/S0025654424605123","url":null,"abstract":"This study investigates the influence of stiffeners and their positioning on the bending behavior of thin stainless-steel plates. Three experimental models were employed: a simple un-stiffened plate, a plate with one stiffener and a plate with two cross stiffeners with clamped boundary conditions. Numerical analysis with ABAQUS software and the C3D8IH solid finite element is carried out and the obtained results are compared to those found experimentally. The findings reveal that the introduction of stiffeners significantly enhances the structural rigidity of the plates, leading to reduced displacements under applied loads. Very good efficiency was observed where the accuracy of the numerical model improved with increasing load, particularly for the cross-stiffened configuration. The error rates between the numerical and experimental results decreased from 19.9336% at lower loads to as low as 0.1675% at higher loads, underscoring the effectiveness of stiffeners in minimizing deflection and aligning theoretical predictions with the experimental outcomes. This research provides valuable insights into the design of stiffened plates for applications requiring enhanced load-bearing capacity and reduced deformations.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":"59 5","pages":"3038 - 3049"},"PeriodicalIF":0.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the Vibration Response of an Automatic Rifle Barrel in Hot and Cold States

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424605299

C. Dai, Y. C. Fu, Y. F. Cao, H. Y. Lyu, C. Xu

{"title":"Study on the Vibration Response of an Automatic Rifle Barrel in Hot and Cold States","authors":"C. Dai, Y. C. Fu, Y. F. Cao, H. Y. Lyu, C. Xu","doi":"10.1134/S0025654424605299","DOIUrl":"10.1134/S0025654424605299","url":null,"abstract":"To gain a deeper understanding of the vibration characteristics of an automatic rifle barrel in both hot and cold states, a non-contact measurement method was used to measure the amplitude and vibration velocity of the barrel during single and repeated shots of a small-caliber automatic rifle. Displacement and velocity curves of the barrel vibration were obtained, and the muzzle vibration in hot and cold states was compared. The study also analyzed the effects of firing loads and the elastic modulus of the barrel material on the barrel’s vibration in a hot state, as well as the applicability of the eccentric rotating stepped beam model. The formation mechanism of the differences in vibration response between hot and cold states was revealed. The research results show that: (1) In both hot and cold states, the muzzle vibration pattern begins with a downward movement of the muzzle, followed by a significant upward motion. After three cycles of forced vibration as the bullet exits the muzzle, the barrel enters a free-damping vibration state until the vibrations dissipate. During Repeated shots, the barrel vibration accumulates, resulting in a larger amplitude than single-shot firing. (2) In the hot state, the barrel’s amplitude and velocity increase, while the vibration frequency decreases. The main reasons for the increased amplitude in the hot state are the decrease in the elastic modulus of the barrel and the increased firing load. (3) The eccentric rotating stepped beam model applies to calculating muzzle vibration in the hot state.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":"59 5","pages":"3163 - 3181"},"PeriodicalIF":0.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Flexoelectric Hollow Cylinder with Thermopolarization Effect

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424605068

Pengfei Yu, Dianhan Yang, Liming Peng, Yaohong Suo, Yihan Wu

{"title":"Analysis of Flexoelectric Hollow Cylinder with Thermopolarization Effect","authors":"Pengfei Yu, Dianhan Yang, Liming Peng, Yaohong Suo, Yihan Wu","doi":"10.1134/S0025654424605068","DOIUrl":"10.1134/S0025654424605068","url":null,"abstract":"Classic thermoelectric coupling effects, such as the Seebeck effect, Peltier effect, and Thomson effect, highlight the significant impact of temperature on the electrical properties of materials. In contrast to these traditional effects, recent studies have identified the emergence of thermopolarization effects, where temperature gradients induce polarization changes in materials, leading to heat flow. Moreover, temperature gradients can also result in strain gradients within the material, which, unlike the piezoelectric effect, can induce polarization, giving rise to the flexoelectric effect. Despite the growing interest in thermopolarization phenomena, there remains a lack of thorough qualitative and quantitative analysis. In this study, we present a thermo-electro-elastic coupling model for an isotropic hollow cylinder incorporating thermopolarization and flexoelectric effects. This model necessitates modifications to the heat conduction equation, constitutive equation, and governing equation. Through numerical simulations, the impact of thermopolarization coefficient and flexoelectric coefficient on radial displacement, temperature, potential, and electrical displacement is investigated. The results show that the steady-state radial displacement and temperature initially increase and then decrease with variations in the thermal polarization coefficient. Moreover, an increase in the thermal polarization coefficient speeds up the thermo-electro-elastic coupling process towards a steady state. Additionally, mutual interactions between flexoelectric and thermal polarization effects are observed. This comprehensive model provides valuable insights for the design and optimization of microelectronic devices.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":"59 5","pages":"3024 - 3037"},"PeriodicalIF":0.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship Between the Results of Analytical Solutions of Elasticity Theory Problems and of Stress State Optimization in the Vicinity of Singular Points

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424604919

A. Yu. Fedorov, V. P. Matveenko

引用次数: 0

Dynamic Bending of a Beam

IF 0.6 4区工程技术

Mechanics of Solids Pub Date : 2025-02-09 DOI: 10.1134/S0025654424603422

V. V. Saurin

{"title":"Dynamic Bending of a Beam","authors":"V. V. Saurin","doi":"10.1134/S0025654424603422","DOIUrl":"10.1134/S0025654424603422","url":null,"abstract":"The article discusses problems of dynamic bending for beams of semi-infinite length. To solve such problems, the article uses a method based on the implementation of the conservation laws, namely, the law of energy conservation, the law of change in momentum and the law of change in angular momentum. The results obtained are compared with the analytical solution for the problem of a semi-infinite beam motion loaded at the free end with a transverse force. The peculiarity of this solution is that the change in the stress-strain state of the rod is characterized by a wave front. It is considered that all changes in the state of the beam occur at an infinite speed. All designed solutions are characterized by the presence of a wave front in the beam. It is shown that, in contrast to the transfer of longitudinal disturbances along the length of the beam, which occur at a constant speed, bending disturbances propagate at a variable speed, and, with increasing time, this speed decreases and tends to zero at an infinitely distant point of the beam. It was discovered that the propagation velocity of the wave front during the transfer of concentrated force and concentrated moment differs from each other. In this case, the speed of transverse force transfer is almost twice as high as the speed of the wave front from the bending moment.","PeriodicalId":697,"journal":{"name":"Mechanics of Solids","volume":"59 5","pages":"2706 - 2718"},"PeriodicalIF":0.6,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0025654424603422.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143373371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0