Search Results (421)

Background: Genioplasty is a well-established surgical technique for reshaping the chin and enhancing facial harmony. However, conventional fixation methods may present biomechanical and aesthetic limitations. Objective: This study introduces and evaluates a novel Anatomical Chin Plate (ACP), designed to enhance mechanical performance and facial aesthetics compared to the conventional chin plate (CP). Methods: A three-dimensional finite element analysis (FEA) was conducted to compare stress distribution in ACP and CP models under a standardized oblique load of 60 N, simulating muscle forces from the mentalis and digastric muscles. Plates were modeled using Blender and analyzed using ANSYS software 2025 r2. Mechanical behavior was assessed based on von Mises stress, concentration sites, and potential for plastic deformation or fatigue failure. Results: The ACP demonstrated a significantly lower maximum von Mises stress (77.19 MPa) compared to the CP (398.48 MPa). Stress distribution in the ACP was homogeneous, particularly around the lateral fixation holes, while the CP exhibited concentrated stress between central screw holes. These findings indicate that the anatomical geometry of the ACP enhances load dispersion, reduces critical stress concentrations, and minimizes fatigue risk. Conclusions: The ACP design offers superior biomechanical behavior and improved aesthetic potential for genioplasty procedures. Its optimized shape allows for better integration with facial anatomy while providing stable fixation. Further studies are recommended to validate in vitro performance and explore clinical applicability in advanced genioplasty and complex osteotomies. Full article

This paper deals with the analysis of four-point bending two- and three-layer corrugated boards along the direction perpendicular to the machine direction. The taken segments of paperboard were examined to determine the bending stiffness for three different configurations. The investigations were carried out experimentally and numerically. The tests of bending were analysed only in the elastic range of the material. Each configuration of paperboard was modelled as an orthotropic material. The numerical analysis was based on the finite element method by applying Ansys^® software. Several material properties and the thicknesses of papers were assumed to determine the general stiffness in bending. In the analysis, two different discrete models based on geometries of the paperboard were elaborated to adjust the results to the experimental ones. The results of analyses for some configurations showed good agreement with the experiment. This paper indicates some differences in stiffness between two- and three-layer paperboards. Full article

This study addresses recurring failures of a gas boiler with a steam capacity of 65,000 kg/h, which is operating in a Polish industrial plant. To determine the cause, material examinations were carried out, including chemical composition and microstructural analysis of SA178A steel, as well as strength tests. The results revealed no significant material degradation outside the cracking zones, suggesting that the failures were primarily caused by thermo-mechanical interactions. A finite element model in Ansys Workbench software was developed, incorporating thermal and mechanical boundary conditions, to reproduce the behavior of the critical section. The analysis demonstrated stress concentrations at the junction between the box and the membrane wall, resulting from large thermal displacement differences. The plastic strains under static loading do not exceed 5%, which implies that, without considering the cyclic nature of boiler operation, the wall should not experience failure. Analysis taking into account only 3 full operating cycles indicates a continuous increase in plastic deformation, which leads to the occurrence of ratcheting. To mitigate these effects, a modification of the sealing box design was proposed. Simulations indicated a reduction in plasticized zones by approximately 65%, and the effectiveness of the solution was confirmed by two years of failure-free operation. The findings highlight the importance of an integrated diagnostic, numerical, and design approach to improving boiler durability. Full article

Long-span prestressed structures present distinct challenges during tensioning. Their considerable length inherently induces significant tendon friction, resulting in substantial prestress loss. Additionally, prestressing operations within buildings will induce initial stresses that affect adjacent structural members. However, research on the design and construction of ultra-long-span prestressed systems with composite materials in building structures remains limited. To investigate prestress effects in long-span building structures, this study examines prestress loss and tension timing for the 94.34 m arch tie girder in Shenzhen Museum. This project marks the first application of the bonded post-tensioning method to an ultra-long composite structural member. The analysis of the prestress loss is conducted by considering the friction, relaxation of steel tendon, creep, and shrinkage. An innovative finite element method, integrating creep and shrinkage effects for composite members, is developed in ANSYS. Four tensioning schemes are compared using nonlinear staged-construction simulation in NIDA software. The results demonstrate that the presented analytical method can effectively quantify the prestress loss. Early-stage prestressing effects can be minimized by optimizing the force transmission paths through construction joints. These findings provide practical and theoretical guidance for designing and constructing similar long-span structures. Full article

The linear rolling guide (LRG) is widely used in the computer numerical control machine tool industry and other industries. To accurately evaluate the performance of LRGs, a multi-parameter test bench was developed to measure motion accuracy, preload drag force (PDF), vibration, temperature rise, and fatigue life. The mechanical structure and measurement and control system of the test bench were designed based on established principles and methods. ANSYS 19.0 software was used for static analysis of the gantry, modal analysis of the upper bed, and simulation of the impact of loading block thickness on load distribution uniformity. At the same time, we used an impact hammer modal test to verify the correctness of the finite element analysis of the upper bed. The analysis results validated the structural design. To verify the test bench’s repeatability, comparative experiments were conducted with the Hilectro LGD35-type LRGs, focusing on motion accuracy, PDF, and fatigue life. The experimental results confirmed the test bench’s high repeatability and validated the derived equations for measuring motion accuracy. Full article

To evaluate the mechanical properties of connectors in timber–concrete composite (TCC) structures under low-cycle reversed loading, eighteen push-out specimens were designed and fabricated following the standard push-out test method. This study presents the first comparative analysis of the seismic performance between notch-bolted and ordinary bolted connections across three bolt diameters (12 mm, 16 mm, and 20 mm), addressing a gap in systematic experimental data for different connection types. Key performance indices under cyclic loading—including stiffness degradation, strength degradation, energy dissipation capacity, and ductility—were investigated. Furthermore, cumulative damage analysis elucidated the damage accumulation process, establishing a damage index (Dw) based on an energy method and proposing Dw = 0.6 as a critical early-warning threshold for failure. Practical recommendations for seismic design and engineering applications are provided. The results demonstrate that compared to ordinary bolted connections, notch-bolted connections achieve a 15–30% increase in ultimate bearing capacity and exhibit superior stiffness. Specimens with 16 mm bolts exhibited optimal ductility (ductility coefficient ξ = 3.6), while notch-bolted connections maintained stable ductility within the range of ξ = 2–3. Finally, a numerical model was developed using ANSYS finite element software. Validation against experimental results confirmed the model’s accuracy in simulating structural behavior. This research elucidates the cumulative damage mechanisms in TCC structures under cyclic loading, providing a theoretical basis for design optimization and valuable insights for promoting the seismic application of these composite systems. Full article

To explore the effects of ultrasonic burnishing strengthening technology on the surface morphology and mechanical properties of 40Cr rods for hydraulic applications, a conical transition composite amplitude transformer was designed using ANSYS (Workbench 2024 R1) finite element analysis software, with a frequency of 18,158 Hz, an amplification factor (M_p) of 2.0, and a maximum stress of 122.9 MPa. The ultrasonic burnishing strengthening process was numerically simulated via ABAQUS finite element analysis software. Based on the single-factor analysis method, the influence of spindle speed, ultrasonic amplitude, and burnishing passes on the maximum residual compressive stress of the hydraulic rod was investigated, and key parameters such as surface roughness and microhardness of the rod before and after ultrasonic burnishing strengthening were comparatively analyzed. The results show that ultrasonic burnishing strengthening technology can reduce the surface roughness of the hydraulic rod, enhance its microhardness, and increase the depth of the plastic deformation layer. Ultrasonic amplitude and burnishing passes exert a significant influence on the maximum residual compressive stress on the rod surface, while the effect of spindle speed is relatively minor. When the ultrasonic amplitude is 10 μm, the spindle speed is 120 r/min, and the burnishing passes are 3, the surface residual compressive stress of the hydraulic rod reaches the maximum experimental value of 433.39 MPa. This study reveals the influence law of process parameters on the surface properties of rods for hydraulic applications, verifies the feasibility of the ultrasonic burnishing system, and provides a technical reference for improving the performance of rods for hydraulic applications. Full article

Hoop-wrapped vessels with metal liners (Type II vessels) are susceptible to the risks of brittle fracture and fatigue failure in high-pressure hydrogen environments. However, there is limited research concerning fitness-for-service (FFS) assessments of Type II vessels. An FFS assessment was conducted on a specific Type II vessel designed for high-pressure hydrogen storage. The mechanical properties of the liner material 4130X were obtained through in situ mechanical testing in a hydrogen environment. Based on the measured data, the stress distribution within the Type II vessel under different working conditions was determined using a finite element analysis by ANSYS Workbench 2019 R2 software. A leak-before-burst (LBB) analysis and a brittle fracture assessment of the Type II vessel were performed using the failure assessment diagram (FAD) methodology. The results indicate that the measured fracture toughness of 4130X under high-pressure hydrogen is 46 MPa·m^0.5, which is significantly lower than the 178 MPa·m^0.5 required for LBB failure for the studied vessel. However, the vessel remains in a safe state when the crack depth is under 3.03 mm. Furthermore, the remaining fatigue life of a Type II vessel containing a crack was calculated. The relationship between the non-destructive testing (NDT) capability requirement and the inspection interval for this type of vessel was explored, providing references for establishing inspection schedules for Type II vessels. Full article

Pumping station structures are widely employed to supply circulating cooling water systems in nuclear power plants (NPPs) throughout China. Investigating their seismic performance under complex heterogeneous site conditions and load scenarios is paramount to meeting nuclear safety design requirements. This study proposes and implements a novel, efficient, and accurate viscous-spring boundary methodology within the ANSYS 19.1 finite element software to assess the seismic safety of NPP pumping station structures. The Maximum Initial Time-step (MIT) method, based on Newmark’s integration scheme, is employed for nonlinear analysis under coupled static–dynamic excitation. To account for radiation damping in the infinite foundation, a Compact Viscous-Spring (CVs) element is developed. This element aggregates stiffness and damping contributions to interface nodes defined at the outer border of the soil domain. Implementation leverages of ANSYS User Programmable Features (UPFs), and a comprehensive static–dynamic coupled analysis toolkit is developed using APDL scripting and the GUI. Validation via two examples confirms the method’s accuracy and computational efficiency. Finally, a case study applies the technique to an NPP pumping station under actual complex Chinese site conditions. The results demonstrate the method’s capability to provide objective seismic response and stability indices, enabling a more reliable assessment of seismic safety during a Safety Shutdown Earthquake (SSE). Full article

This study proposes a design and initial validation of a biocompatible artificial human heart that mimics beating behavior. Advanced geometrical modelling in SolidWorks software (student version) and finite element analysis (FEA) using ANSYS 2024 (student version) has been made, including Neo-Hookean hyper elastic material i.e., medical-grade silicone for cardiac tissue replication. The design consists of four-chambers, where the chambers’ dimensions were optimized to maintain uniform pressurization. We observed controlled wall displacement and low stress under simulated physiological conditions with our model. These results provide the basis of the design to be used as an effective teaching platform for medical students and a platform to future progress toward an implantable circulatory assistance device. These findings provide deeper insights into cardiac biomechanics and represent a novel approach to managing a growing need for cardiac alternatives to transplantation. Additionally, the report details the application of pressure and records displacement and stress outcomes from FEA. Through integration of hyper elastic material behavior into the design framework, the research provided critical insights into the performance of silicone-based models, informing future experimental studies and clinical translation. Full article

The aim of this work is to analyse the effectiveness of the medical use of the Cavitron Ultrasonic Surgical Aspirator (CUSA) in microsurgical treatment of Intramedullary Spinal Cord Tumors (IMSCTs), with a focus on the thermo-mechanical effects on neighbouring tissues to assess any potential damage. Indeed, CUSA emerges as an innovative solution, minimally invasive tumor excision technique, enabling controlled and focused operations. This study employs a Finite Element Analysis (FEA) to simulate the vibratory and thermal interactions occurring during CUSA application. A computational model of a vertebral column segment affected by an IMSCT was developed and analysed using ANSYS 2024 software. The simulations examined strain distribution, heat generation, and temperature propagation within the biological tissues. The FEA results demonstrate that the vibratory-induced strain remains highly localised to the application site, and thermal effects, though measurable, do not exceed the critical safety threshold of 46 °C established in the literature. These findings suggest that CUSA can be safely used within defined operational parameters, provided that energy settings and exposure times are carefully managed to mitigate excessive thermal accumulation. These conclusions contribute to the understanding of the thermo-mechanical interactions in ultrasonic tumour resection and aim to assist medical professionals in optimising surgical protocols. Full article

In the present work, the optimization of ceramic-based composite WC(Co,Ni) welds by laser cladding was carried out using response surface methodology based on finite element analysis. The heat distribution and temperature field of laser-melted WC(Co,Ni) ceramic coatings were simulated using ANSYS software, which allowed the computation of the distribution of residual stresses. The results show that the isotherms in the simulation of the temperature field are elliptical in shape, and that the isotherms in front of the moving heat source are dense with a larger temperature gradient, while the isotherms behind the heat source are sparse with a smaller temperature gradient. In addition, the observed microstructural evolution shows that the melting zone domains of WC(Co,Ni) are mainly composed of unmelted carbides. These carbides are dendritic, rod-like, leaf-like, or net-like, and are agglomerated into smaller groups. The W content of these unmelted carbides exceeds 80%, while the C content is around 1.5–3.0%. The grey areas are composed of WC, Co and Ni compounds. Based on the regression model, a quadratic model was successfully constructed. A three-dimensional profile model of the residual stress behaviour was further explored. The estimated values of the RSM-based FEA model for residual stress are very similar to the actual results, which shows that the model is effective in reducing residual stress by laser cladding. Full article

This paper focuses on the sealing failure problem of double-lip seal rings for high-speed ball bearings used in unmanned aerial vehicles. By using ANSYS 2023R1 software, a thermal–stress–wear coupled finite element model was established. Taking the contact pressure and volume loss due to wear as indicators to evaluate sealing performance, this study analyzed the influence of lip seal structural parameters on sealing performance, performed response surface optimization of the seal structure parameters and conducted a comparative test on lip seals before and after optimization. The research results show that the contact pressure at the main lip of the lip seal was the greatest, which was 0.79 MPa, and the volume loss due to wear lip seal was 7.94 × 10⁻⁷ mm³. Optimal sealing performance is achieved when the seal lip inclination angle is 41.68°, the middle width of the lip seal is 0.153 mm, the main lip height is 0.179 mm, the spring center distance is 0.37 mm and the radial interference is 0.0034 mm. After optimization, the grease leakage rate of the sealing ring decreased by 48% compared to before optimization. Full article

The constitutive model is widely employed to characterize the rheological properties of metallic materials under high-temperature conditions. It is typically derived from a series of high-temperature tests conducted at varying deformation temperatures, strain rates, and strains, including hot stretching, hot compression, separated Hopkinson pressure bar testing, and hot torsion. The original experimental data used for establishing the constitutive model serves as the foundation for developing phenomenological models such as Arrhenius and Johnson–Cook models, as well as physical-based models like Zerilli–Armstrong or machine learning-based constitutive models. The resulting constitutive equations are integrated into finite element analysis software such as Abaqus, Ansys, and Deform to create custom programs that predict the distributions of stress, strain rate, and temperature in materials during processes such as cutting, stamping, forging, and others. By adhering to these methodologies, we can optimize parameters related to metal processing technology; this helps to prevent forming defects while minimizing the waste of consumables and reducing costs. This study provides a comprehensive overview of commonly utilized experimental equipment and methods for developing constitutive models. It discusses various types of constitutive models along with their modifications and applications. Additionally, it reviews recent research advancements in this field while anticipating future trends concerning the development of constitutive models for high-temperature deformation processes involving metallic materials. Full article

With the increasing environmental pollution and resource consumption caused by automobiles, a lightweight design of automobiles is the best solution at present. In this paper, the load-bearing frame of pure electric SUVs is taken as the research object. The finite element analysis method is used to analyze the strength, stiffness and modal performance of the load-bearing frame, and the material selection of the frame is optimized according to the analysis results to achieve a lightweight design. First, a three-dimensional model of the pure electric SUV frame is established using SolidWorks software 2019 and then imported into ANSYS 2024 R1 Workbench for meshing and material property definition. Then, through finite element static analysis, the various force conditions of the frame under three typical working conditions of full-load bending, full-load braking and full-load turning are simulated; the stress distribution and deformation of the frame under different working conditions are confirmed; and the strength and stiffness performance of the frame are evaluated. After the above analysis, a modal analysis of the frame is carried out, and the natural frequency and vibration mode of the frame are finally obtained. According to the analysis results, the material replacement method is selected to optimize the lightweight design of the frame. The results show that the weight of the frame is significantly reduced after material optimization, while still meeting the strength, stiffness and modal performance requirements. This article provides a certain reference value for the lightweight design of pure electric SUV frames in the future. Full article