Abstract Based on the inverse piezoelectric effect and other characteristics of piezoelectric ceramics, a new type of piezoelectric variable friction damper is developed, and the output performance test of piezoelectric ceramic actuator and piezoelectric variable friction damper is carried out, and the parametric mechanical model of the damper is established by using Simulink to carry out numerical simulation, and compared and analyzed with the test results. The results of the study show that the simulation and the test present a good regular agreement. With the increment of loading voltage, the displacement deformation and zero-displacement thrust of piezoelectric ceramic actuator are approximately linear with the loading voltage; when the loading voltage is increased by 15V every time, the test value of the output damping force of the damper increases by 259.66N on average step by step, and the simulated value increases by 256.14N step by step, and the damping force has a linearly incremental relationship with the voltage and the slope of the linear increase is 16.434. ceramics developed agreement zerodisplacement zero V time 25966N N 259 66N 25614N 256 14N 16434 16 434 16.434 25 1643 1 43 16.43 2 164 4 16.4 16.

Abstract To further improve the strike accuracy and penetration power of explosively-formed projectile (EFP) after long-distance flight, a polygonal charge capable of forming EFP with tail fins was designed during the study. A model for calculating the EFP velocity was derived from the effective charge and detonation projection theories with the integration of calculus. The circumferential velocity distributions of EFP formed using polygonal charges were obtained using this model, and the mechanisms underlying the formation of tail fins were elucidated. The feasibility of using this polygonal charge to form tail fin EFP was verified by conducting multi-media soft recovery tests and numerical simulations. Furthermore, the feasibility of forming tail fin EFP using polygonal charges with different numbers of sides and the effects of the structural parameters of a hexagonal charge on the formation of tail fin EFP were investigated by simulation. The ranges of optimal values for the structural parameters of a hexagonal charge capable of forming high-performance tail fin EFPs were determined. explosivelyformed explosively (EFP longdistance long distance flight study calculus elucidated multimedia multi media simulations Furthermore simulation highperformance high performance determined

Abstract This work introduces a new family of strain tensors based on the hyperbolic sine function: The Generalized Hyperbolic Sine (GHS). This family is obtained by using any given strain measure as an argument in a normalized hyperbolic sine function. Particularly, this paper adopts the Seth-Hill family as an argument and shows how some drawbacks of the classical strain measures can be overcome by means of the proposed strain family. A broad analytical study of pure deformation modes (simple axial extension, equi-biaxial loading and simple shear) is presented to show the behavior of the proposed strain family and investigate the physical coherence of their responses. Obtained results are promising as the GHS family proved itself capable of enhancing the physical behavior of the Seth-Hill strain measures and providing versatility with the addition of just one material constant with clear physical meaning. Materials investigated in the article are isotropic and homogeneous. The proposed Hookean-type hyperelastic models can be applied for both incompressible and compressible materials without additional strain energy density function changes. GHS. . (GHS) Particularly SethHill Seth Hill extension equibiaxial equi biaxial shear responses meaning homogeneous Hookeantype Hookean type changes (GHS

Abstract The detonation of conventional munitions due to accidents or hostile actions causes urban destruction and loss of life, underscoring the need for improved safety measures. This study addresses the scarcity of research in munitions safety by investigating the threat of small and medium munitions. Experimental setups using 50mm shaped charges were developed and simulated with ANSYS AUTODYN, featuring JH-2 explosive and oxygen free high conductivity copper liner. Aluminum buffer plates were added to align jet energy levels with small and medium munitions' requirements. Safety assessments of JH-2 explosive against standard charges utilized φ45x40mm JH-2 targets covered with steel. Numerical simulations employed the Lee-Tarver ignition and growth model, comparing JH-2 explosive response with insensitive explosives like LX-17 and TATB. Results showed JH-2's failure in experimental tests, corroborated by simulations, while TATB and LX-17 remained stable. This study advocates for the adoption of cost-effective, insensitive explosives in next generation weaponry to mitigate unintentional detonations. life measures mm AUTODYN JH2 JH 2 JH- liner requirements φxmm φ x steel LeeTarver Lee Tarver model LX17 LX 17 LX-1 JH2s JHs s tests stable costeffective, costeffective cost effective, effective cost-effective detonations LX1 1 LX-

Abstract The study aims to enhance the bonding strength in reinforced concrete using a novel Auxetic Tubular Deformed Rebar (ATDR). A high-resolution non-linear finite element model was developed to perform numerical analysis of pull-out tests (PoT). Two sets of numerical simulations were conducted: one to replicate the concrete behavior under compression and tension tests, and the other for PoT, validated with experimental and numerical data. Numerical tests utilized a microplane model with plasticity–damage, regularized by an implicit gradient. Auxetic geometry involves adding ellipsoidal orifices to the rebar surface. Comparing the behavior of ATDR with the conventional rebar, we observed an increase in the negative value of Poisson's ratio, resulting in higher normal and shear forces, enhancing adherence. This study presents the first comprehensive simulation of Auxetic Metamaterial Rebar in concrete, offering a promising approach to enhance bond strength. Further research, both numerical and experimental, is essential to assess Auxetic Reinforcement's mechanical behavior in diverse structural elements and load scenarios. ATDR. . (ATDR) highresolution high resolution nonlinear non linear pullout pull out PoT. PoT (PoT) conducted data plasticitydamage plasticity damage plasticity–damage gradient surface Poissons Poisson s ratio forces adherence research Reinforcements Reinforcement scenarios (ATDR (PoT

Abstract In this paper, the penetration resistance of 6061 aluminum plates to explosively formed projectiles (EFPs) at the incidence angles of 0°, 15°, 30°, and 45° was studied. The penetration process was roughly divided into three typical stages—the plastic flanging stage of the target, the righting stage of the projectile, and the plug formation stage of the target. Through the energy analysis, the energy consumption of the aluminum plate increased with the increase in the incidence angle during the entire penetration process. Through the microscopic analysis of the perforated wall surface of the aluminum plate, it was found that there were distinct boundaries and differences between the plastic reaming zone and the punching plug fracture zone.. Overall, four kinds of classification modes were proposed for the damage of the aftereffect plate, which provides a method to evaluate the aftereffect of EFP oblique penetration into 6061 aluminum plates. paper 606 EFPs (EFPs 0 0° 15 15° 30 30° 45 studied stagesthe stages target projectile zone. Overall 60 1 3 4 6

Abstract To study the propagation and evolution of one-dimensional elastoplastic waves within the system under rectangular, trapezoidal, and half-sine incident waves, leveraging elastoplastic incremental wave theory and numerical simulation calculations, the research qualitatively investigates the distribution and evolution of the stress field within the specimen, the impact of Bar 2 parameters, and the deformation characteristics of Bar 2 under these three types of incident waves. The findings indicate: Regardingthe overall stress uniformity of Bar 2 during the entire loading phase, the rectangular incident wave is the most effective, while the half-sine and trapezoidal waves are more advantageous for analyzing the stress conditions in Bar 2 during the early loading phase. The diameter and dimensionless density of the specimen significantly influence the stress non-uniformity, showing an approximate negative and positive correlation, respectively. onedimensional one dimensional halfsine half sine calculations parameters indicate phase effective nonuniformity, nonuniformity non uniformity, non-uniformity correlation respectively

Abstract This paper introduces the Julia programming language as a dynamic, cost-effective, and efficient framework for implementing structural analysis packages. To achieve this, the finite element method was implemented for plane frames addressing the elastic instability problem through the Finite Element Method (FEM). Julia is a language open source, multiplatform, high-level and high-performance for technical and scientific computing, its compiler allows you to achieve speeds comparable to languages such as C and FORTRAN, but with more productive development dynamics due to its programming flexibility. Benchmarks between Julia and MATLAB are employed to discuss the processing costs, the programming techniques and paradigms used for computational performance. The results demonstrate that Julia performed the same analysis as the language used for comparison in 88.40% of the time, in addition to the fact that in loops comparisons case it reached 41.7% of the time for iteration, confirming its significant potential as a development tool of computational packages for structural analysis and scientific computing in general. dynamic costeffective, costeffective cost effective, effective cost-effective this FEM. FEM . (FEM) source multiplatform highlevel high level highperformance performance FORTRAN flexibility costs 8840 88 40 88.40 417 41 7 41.7 iteration general (FEM 884 8 4 88.4 41. 88.

Abstract In this study, stress variations in cylindrical single lap joints under tensile loading were investigated as both elastic and viscoelastic(time-dependent) solutions. Analytical modeling utilized the Pugno-Carpinteri method and the Lubkin-Reissner method, while numerical modeling employed the Abaqus analysis program. The viscoelastic solution was derived from the associated elastic solution application using the Alfrey correspondence principle. Transformed elastic modulus values for the viscoelastic solution were obtained through methodologies proposed by Schapery and the generalized Maxwell-Wiechert model. The analyses revealed that maximum stress occurred at the initiation of loading, with stress values decreasing over time at the adhesive edges, and an increase in stiffness observed in the central region of the adhesive. In single lap joints, it was found that overall in-plane stiffness remained constant independent of the adhesive modulus value. study viscoelastictimedependent dependent viscoelastic(time-dependent solutions PugnoCarpinteri Pugno Carpinteri LubkinReissner Lubkin Reissner program principle MaxwellWiechert Maxwell Wiechert model edges inplane plane value

Abstract The flexibility matrix finds extensive application in detecting damage in civil and mechanical engineering structures, a focus explored in-depth within this paper. This study meticulously examines distinct components of the flexibility matrix, namely the proposed Diagonal of the Flexibility Matrix Vector (DFV) and a singular row/column of the flexibility matrix (RFV). Both DFV and RFV can be represented uniquely as a specialized form-a weighted combination of the Hadamard product of two mode shapes. Sensitivity analysis reveals that DFV undergoes a sharp change in proximity to damage, establishing it as a dependable indicator for pinpointing damage locations. Conversely, this characteristic is not consistently observed with RFV. The results of numerical simulations conducted on a 16-story frame structure corroborate the outcomes of the sensitivity analysis, underscoring the efficacy of DFV not only in localizing damage but also in gauging its severity. To illustrate the potential and limitations of DFV/RFV in practical scenarios, damage localization for the I-40 Bridge is provided. structures indepth depth paper (DFV rowcolumn row column . (RFV) forma form shapes locations Conversely 16story story 16 severity DFVRFV scenarios I40 I 40 I-4 provided (RFV 1 I4 4 I-

Abstract For the design of scaled model and similarity prediction of vibration of 300,000m3 blast furnace gasholder body, based on energy method and discrete stiffening theory, the scaling principle relation of gasholder body free vibration are derived. By using the thickness scale factor of the gasholder body skin and rib is distorted, and utilizing the stiffness equivalence, respectively, gasholder body scaled models (stiffened rib equivalent to rectangle) with geometric distortion and with both geometric and material distortion are designed and fabricated respectively. The free vibration of distortion similarity prediction of gasholder body prototype is carried out by the method of simulation and test. Results show that both two kinds of gasholder body scaled models, can predict the prototype frequency more accurately by using the similarity coefficient calculated by the average bending stiffness of column, ring rib, and wind-resistant ring. The proposed design method and scaling principle relation for gasholder body scaled model with free vibration and distortion are suitable for the design of scaled model distortion and similar prediction of free vibration of longitudinal ring-stiffened large thin-walled cylindrical shells with T-shaped and I-shaped stiffeners. 300000m3 m 300 000m3 300,000m theory derived distorted equivalence respectively stiffened rectangle test column windresistant wind resistant ringstiffened thinwalled thin walled Tshaped T shaped Ishaped I stiffeners 300000m 30 000m 3

Abstract This work leverages Finite Element (FE) modelling to optimise the deck geometry in continuous composite slab systems, focusing on trapezoidal profile decks. Subsequently, it examines the effectiveness of reinforcing the hogging moment area with Carbon Fiber Reinforced Polymer (CFRP). The main objective is to improve the structural performance when subjected to static loads by optimising geometric factors such as deck height and thickness. The deck profile that yielded the best results had a height of 60 mm, a thickness of 1 mm, and a shear span of 850 mm and resulted in a 7.6% increase in the ultimate load compared to a deck with a thickness of 0.75 mm. The study also assesses the impacts of CFRP reinforcement configurations. The optimal outcome was attained by utilising carbon fiber reinforced polymer (CFRP) sheets that spanned the whole width of the slab for a length of 1.7 m, resulted in a significant 43.17% enhancement in ultimate load. The CFRP enhanced slab, which spans the whole width, demonstrated a maximum load-carrying capability of 176.78 kN. Theoretical analysis indicated a high level of concurrence with FEM. FE (FE systems decks Subsequently CFRP. . 6 85 76 7 7.6 075 0 75 0.7 configurations (CFRP 17 1. m 4317 43 43.17 loadcarrying carrying 17678 176 78 176.7 kN FEM 8 7. 07 0. 431 4 43.1 1767 176. 43.

Abstract For solving a large amount of data processing and reducing the cost to improve detection accuracy, this paper proposes an intelligent detection model for railway vehicle wheels flat. We propose an automatic data processing algorithm for labeling large-scale data to maximize the benefits of each experiment data. To improve the generalization of the detection model to improve the accuracy, we combine the vehicle dynamics simulation data and the simulation experiment data based on the single wheel rolling test bench to construct the data set for detecting the wheel flat. Different from the existing detection models, this paper provides a method for constructing the data sets, which is used to assist machine learning in constructing the intelligent detection model. The data set and its construction method can also promote the application of data mining in the field of railway transportation. This paper verified the effectiveness of the features obtained from data processing in the detection model. The data set is used to detect and identify the wheel flat and the recognition accuracy is 98.6%. largescale scale models sets transportation 986 98 6 98.6% 9 98.6 98.

Abstract This research proposes an innovative method to convert the modeling of three-dimensional structures to the modeling of two-dimensional structures for the stability analysis of long tubular buildings. The process of the proposed method is in the form of modeling the equivalent frame and then modeling the reduced frame using the equivalent moment of inertia for beams and columns. The second-order elastic analysis has been performed considering the effects of P-Δ and P-δ. Framed-tube and frame tube-in-tube systems have been used for modeling. Newton's Raphson and Crisfield's Arc Length methods have also been used for nonlinear analysis. The accuracy and speed of analysis of the new method have been checked by comparing the displacements and drifts in the modeled systems for 40 and 50 stories tall buildings. For each structure, two framed-tube and tube-in-tube systems are considered. In the presented method, the number of nodes and elements in the reduced model is much less. The method presented in this research can reduce the amount of calculating the response of tall structures and the duration of the analysis. One of the advantages of the presented method is the acceptable accuracy of the analysis along with the high speed of the analysis. The results show that the proposed method has reduced the amount of calculations by 80% along with a 5% reduction in the accuracy of structural responses. threedimensional three dimensional twodimensional buildings columns secondorder second order PΔ P Δ Pδ. Pδ δ. δ P-δ Framedtube Framed tube tubeintube Newtons Newton s Crisfields Crisfield 4 5 structure framedtube framed considered less 80 responses 8

Abstract In this paper, a methodology is proposed to evaluate the optimal design of truss structures considering progressive collapse. This methodology combines Total-Lagrangian formulation for material and geometrical nonlinear analysis, using nodal positions and log-strain measure; the Systematic Reliability-based Approach to Progressive Collapse method; and risk-optimization formulation. Two benchmark examples are analyzed and discussed. The results demonstrate the accuracy, robustness, and efficiency of the proposed methodology in evaluation the optimal design of truss structures subjected to progressive collapse. It is shown that material behavior (elastic, elastoplastic, and hyperelastic) and rate of loading (step and linear load) can lead to different optimal design configurations. In the redundant hyperstatic truss example, the coefficient of vulnerability identifies the most critical bar for each truss configuration. The most vulnerable bars in the reference design become less vulnerable in the optimal design, leading to load redistribution, or alternate load paths, which reduce the probability of occurrence of progressive collapse. paper collapse TotalLagrangian Total Lagrangian analysis logstrain log strain measure Reliabilitybased Reliability based method riskoptimization risk optimization discussed accuracy robustness elastic, elastic (elastic elastoplastic hyperelastic step configurations example configuration redistribution paths