Relevant bibliographies by topics / Quasi-static loading conditions

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Quasi-static loading conditions'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Quasi-static loading conditions.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Quasi-static loading conditions"

1

Marzec, I., and J. Tejchman. "Computational modelling of concrete behaviour under static and dynamic conditions." Bulletin of the Polish Academy of Sciences: Technical Sciences 61, no. 1 (March 1, 2013): 85–96. http://dx.doi.org/10.2478/bpasts-2013-0007.

Full text
Abstract:
Abstract The paper presents results of FE simulations of the concrete behaviour under quasi-static and dynamic loading. For quasi-static cyclic analyses, an enhanced coupled elasto-plastic-damage constitutive model has been used. To take the effect of the loading velocity into account, viscous and inertial terms have been also included. To ensure the mesh-independence and to properly reproduce strain localization in the entire range of strain rates, a constitutive formulation has been enhanced by a characteristic length of micro-structure by means of a non-local theory. Numerical results have been compared with some corresponding laboratory tests
APA, Harvard, Vancouver, ISO, and other styles
2

Bozhevolnaya, Elena, and Ole Thybo Thomsen. "Structurally graded core junctions in sandwich beams: quasi static loading conditions." Composite Structures 70, no. 1 (August 2005): 1–11. http://dx.doi.org/10.1016/j.compstruct.2004.08.030.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Csomós, Zilia, and János Lukács. "Fatigue Crack Growth Tests on Glass Fibre Reinforced Polymer Matrix Composite." Materials Science Forum 473-474 (January 2005): 189–94. http://dx.doi.org/10.4028/www.scientific.net/msf.473-474.189.

Full text
Abstract:
E-glass fibre reinforced polyester matrix composite was investigated, which was made by pullwinding process. Round three point bending (RTPB) specimens were tested under quasi-static and mode I cyclic loading conditions. Load vs. displacement (F-f), load vs. crack opening displacement (F-v) and crack opening displacement range vs. number of cycles (ΔCOD-N) curves were registered and analysed. Interfacial cracks were caused the final longitudinal fracture of the specimens under quasi-static and cyclic loading conditions.
APA, Harvard, Vancouver, ISO, and other styles
4

Liu, Yang, and Shaoyi Zhang. "Damage Localization of Beam Bridges Using Quasi-Static Strain Influence Lines Based on the BOTDA Technique." Sensors 18, no. 12 (December 15, 2018): 4446. http://dx.doi.org/10.3390/s18124446.

Full text
Abstract:
The diagnosis of damage in a bridge superstructure using quasi-static strain influence lines (ILs) is promising. However, it is challenging to accurately localize the damage in a bridge superstructure due to limited numbers of strain IL measurement points and inconsistencies between the loading conditions before and after damage. To address the above issues, the Brillouin optical time domain analysis (BOTDA) technique is first applied to bridge damage localization using quasi-static strain ILs, and the number of strain IL measurement points is substantially increased. Additionally, a damage localization index based on quasi-static strain ILs that is independent of differences in the loading conditions before and after damage is proposed to localize damage in the superstructure of a beam bridge. Finally, the effectiveness of the proposed method is demonstrated through both numerical analysis and measured data from a quasi-static test of a model bridge.
APA, Harvard, Vancouver, ISO, and other styles
5

Zeng, Cong, Bin Wu, Guoshan Xu, Zhen Wang, and Tianlin Pan. "Dual – loop force – displacement mixed control strategy and its application on the quasi – static test." Engineering review 38, no. 3 (2018): 296–302. http://dx.doi.org/10.30765/er.38.3.6.

Full text
Abstract:
The Quasi-static test is a well-known powerful methodology to evaluate the seismic performance of structural components and systems. One of the most important challenges in the Quasi-static testing is to achieve precise boundary conditions, especially for the axial loading of vertical components. The requirement of synchronized displacement loading and target axial force formed a pair of contradiction. A dual-loop force-displacement mixed control strategy is proposed. The presented approach is successfully verified through the quasi-static testing for a full-scale concrete filled steel tube column. The control targets are achieved with an excellent control performance.
APA, Harvard, Vancouver, ISO, and other styles
6

Nozères, Frédéric, Hervé Couque, Rémi Boulanger, Yann Quirion, Patrice Bailly, and Jérôme Limido. "Numerical modelling strategies using implicit and explicit methods to simulate quasi-static and dynamic three-points bend fracture tests of a ductile steel." EPJ Web of Conferences 250 (2021): 02033. http://dx.doi.org/10.1051/epjconf/202125002033.

Full text
Abstract:
Three-point bend fracture tests have been conducted at different loading rates with a quadratic martensitic steel. The failure energy has been found to increase with loading rate. To get insights in this increase a numerical investigation has been undertaken with different strategies using ABAQUS and IMPETUS softwares in order to address quasi-static and dynamic loading conditions. Simulations were conducted with the ABAQUS software in order to carry out a comparative analysis of both implicit and explicit approaches. In addition to standard Finite Element Method (FEM) applied to quasi-static and dynamic conditions, the eXtended-Finite Element Method (X-FEM) was applied to quasistatic conditions. In both approaches, implicit and explicit, crack initiation and propagation were governed by a critical plastic strain threshold combined with a displacement-based damage evolution criterion. Simulations conducted with the IMPETUS software use an explicit approach and second order elements for both quasi-static and dynamic loading conditions. A node-splitting method using an energy-based damage criterion was employed to simulate the crack initiation and propagation. Experimental data and numerical results have been compared, allowing to determine the ability of these two softwares to simulate accurately three-point bend fracture tests.
APA, Harvard, Vancouver, ISO, and other styles
7

Osnes, Karoline, Odd Sture Hopperstad, and Tore Børvik. "Quasi-Static and Dynamic Testing of Annealed Float Glass." Proceedings 2, no. 8 (June 29, 2018): 495. http://dx.doi.org/10.3390/icem18-05412.

Full text
Abstract:
Three different experimental set-ups were employed in the investigation of the fracture strength of annealed float glass. These included four-point bending tests on three different specimen sizes, and quasi-static and dynamic pressure tests. The latter tests were conducted in a shock tube, i.e., a device that produces pressure loadings similar to that from a far-field blast event. The experimental work demonstrated that the fracture strength of glass varies largely within the same test set-up. It also revealed that the fracture strength and its scatter are dependent on the size of the specimen, the boundary conditions and the loading situation. By employing a newly proposed strength prediction model, which relies on the physical fracture behaviour of glass, the trends observed in the experiments were correctly recreated.
APA, Harvard, Vancouver, ISO, and other styles
8

Hu, Wen Jun, Xi Cheng Huang, Fang Ju Zhang, and Yong Mei Chen. "Compression Tests of Polycarbonate under Quasi-Static and Dynamic Loading." Applied Mechanics and Materials 442 (October 2013): 125–28. http://dx.doi.org/10.4028/www.scientific.net/amm.442.125.

Full text
Abstract:
Strain rate response of polycarbonate was investigated under uniaxial compression at different rates of strain ranging from 0.0001/sec to about 8200/sec and different temperature ranging from 145k to about 423k. A split Hopkinson pressure bar was used to determine the dynamic compressive responses. A pulse-shaping technique was employed in dynamic compression experiment to ensure that valid experimental conditions were satisfied. Results show that, compared with quasi-static behavior, dynamic compression results in significantly higher compressive strengths for polycarbonate materials.
APA, Harvard, Vancouver, ISO, and other styles
9

Weidenmann, Kay André, Eberhard Kerscher, Volker Schulze, and Detlef Löhe. "Mechanical Properties of Compound-Extruded Aluminium-Matrix Profiles under Quasi-Static Loading Conditions." Advanced Materials Research 10 (February 2006): 23–34. http://dx.doi.org/10.4028/www.scientific.net/amr.10.23.

Full text
Abstract:
Compound-extruded unidirectionally reinforced lightweight profiles are a novel class of materials for the realisation of load-bearing structures. They may be fabricated in a flexible and rapid near-net-shape process. The authors present investigations of the reinforcing effect of wires in compound-extruded aluminum profiles under quasi-static tension and compression. In particular, the compounds were characterized by metallographic examinations focusing on the fracture morphology. Furthermore, specimens subject to compression tests were examined using micro computer tomography (µ-CT) and light microscopy (LM). It is shown, that the mechanical properties of wire-reinforced profiles are improved under both positive and negative quasi-static loads in comparison to non-reinforced profiles.
APA, Harvard, Vancouver, ISO, and other styles
10

Zhang, Wen Hao, Qing Qian, Zong Bao Shen, You Juan Ma, and Hui Xia Liu. "Numerical Simulation Study of Quasi-Static Loading and Dynamic Loading for Micro Bending Forming of Copper Foil." Key Engineering Materials 723 (December 2016): 503–11. http://dx.doi.org/10.4028/www.scientific.net/kem.723.503.

Full text
Abstract:
A variety of micro forming processes has been invented, and the size effects have become a research hotspot at home and abroad. Micro bending molds with different feature sizes were designed. Quasi-static tester loading and dynamic laser shock loading with soft punch for micro bending forming was studied by numerical simulation respectively based on ANSYS implicit analysis and LS-DYNA explicit analysis. The constitutive models of workpiece are bilinear kinematic hardening model and Johnson-cook model respectively. The effects of different loading conditions and feature sizes of the die on the forming depth, equivalent plastic strain and equivalent plastic strain rate were studied. The results of numerical simulation show that, with the increasing of feature size of the mold, the forming depth under two kinds of loading conditions shows a tendency to increase. In dynamic laser shock loading, the equivalent plastic strain and equivalent plastic strain rate of the key position of the bent part would decrease with the increasing of the feature size of the die. While in quasi-static loading, the opposite law is shown. The research shows that, the flexible micro-bending processes with different loading models showed similar size effect. However, compared with quasi-static loading, in dynamic loading, the strain of forming parts is more centralized, and there is a high strain rate and better formability of the workpiece.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Quasi-static loading conditions"

1

Jearanaisilawong, Petch 1979. "Investigation of deformation and failure mechanisms in woven and nonwoven fabrics under quasi-static loading conditions." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/30296.

Full text
Abstract:
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.
"September 2004."
Includes bibliographical references (leaves 107-115).
The mechanical responses of high performance ballistic woven and nonwoven fabrics under in- plane quasi-static loading conditions have been investigated. The investigations focused on the responses of fabrics at the mesostructural level as well as at the macroscopic level under uniaxial tensile and in-plane shear modes of deformation. A number of experimental methods have been developed, including techniques to test individual fibers (coupon fiber test), techniques to test fabric specimens with the aid of custom-designed fixtures, and techniques relying on image analysis to capture the deformation response of the fabric. Two continuum models have been developed for each type of fabric based on the deformation and failure mechanisms observed in the experiments. The models are able to capture essential features of the in-plane deformation of the fabrics in a computationally efficient framework.
by Petch Jearanaisilawong.
S.M.
APA, Harvard, Vancouver, ISO, and other styles
2

Caupp, Sarah N. "PMHS Shoulder Stiffness Determined by Lateral and Oblique Impacts." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397649566.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Král, Petr. "Verifikace nelineárních materiálových modelů betonu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2015. http://www.nusl.cz/ntk/nusl-227601.

Full text
Abstract:
Diploma thesis is focused on the description of the parameters of nonlinear material models of concrete, which are implemented in a computational system LS-DYNA, interacting with performance of nonlinear test calculations in system LS-DYNA on selected problems, which are formed mainly by simulations of tests of mechanical and physical properties of concrete in uniaxial compressive and tensile on cylinders with applying different boundary conditions and by simulation of bending slab, with subsequent comparison of some results of test calculations with results of the experiment. The thesis includes creation of appropriate geometric models of selected problems, meshing of these geometric models, description of parameters and application of nonlinear material models of concrete on selected problems, application of loads and boundary conditions on selected problems and performance of nonlinear calculations in a computational system LS-DYNA. Evaluation of results is made on the basis of stress-strain diagrams and load-displacement diagrams based on nonlinear calculations taking into account strain rate effects and on the basis of hysteresis curves based on nonlinear calculations in case of application of cyclic loading on selected problems. Verification of nonlinear material models of concrete is made on the basis of comparison of some results of test calculations with results obtained from the experiment.
APA, Harvard, Vancouver, ISO, and other styles
4

"DEFORMATION AND DAMAGE MECHANISMS IN SELECTED 2000 SERIES ALUMINUM ALLOYS UNDER BOTH QUASI-STATIC AND DYNAMIC IMPACT LOADING CONDITIONS." Thesis, 2015. http://hdl.handle.net/10388/ETD-2015-08-2193.

Full text
Abstract:
In recent times, application of aluminum alloys is favored in the transportation sectors such as the aerospace and automobile industries where reduced fuel consumption and greenhouse gas emission are major priorities. In these applications, these alloys can be exposed to dynamic shock loading conditions as in the case of car crash and birds’ collision during aircraft’s take-off or landing. This study therefore focused on the deformation and damage mechanisms in AA 2017, AA 2024 and AA 2624 aluminum alloys under both quasi-static and dynamic impact loading conditions. Cylindrical specimens of the selected aluminum alloys were investigated under both quasi-static loading at 3.2 x10-3 s-1 using an Instron R5500 mechanical testing machine and dynamic impact loading using the split Hopkinson pressure bar at strain rates ranging between 2000 and 8000 s-1. The effects of strain rate and temper condition on the microstructural evolution in the alloys during mechanical loading were studied. The electron backscatter diffraction (EBSD) technique was used to investigate the texture of the naturally-aged AA 2017 and AA 2624 alloys before and after dynamic shock loading. The contributions of the major alloying elements such as copper, magnesium and silicon to the microstructural evolution and deformation behavior of the alloys under the dynamic shock loading condition were also studied using the energy dispersive spectroscopy (EDS) technique. Results showed that the morphology and atomic distribution of particles in the investigated alloys are functions of the temper condition. The hardness of all the three alloys was higher in the age-hardened conditions than the annealed ones. Although deformation of the alloy under quasi-static compressive loading was dominated by strain hardening, flow softening leading to strain localization and formation of shear bands occurred once certain critical strain values were reached. Under both quasi-static and dynamic loading, the alloys with low Cu:Mg ratio (AA 2024 and AA 2624) showed higher mechanical strength in age-hardened condition than that with high Cu:Mg ratio (AA 2017). All the alloys in the annealed condition exhibited an enhanced plasticity and formability. Intense strain localization leading to formation of adiabatic shear bands (ASBs) was the principal contributor to failure in the alloys under dynamic impact loading. Both deformed and transformed bands were observed, with cracking occurring mainly along the transformed shear bands. The tendency for formation of adiabatic shear bands is observed to be a function of the alloy composition, temper condition, strain, strain rate and strain hardening rate. In the natural aging condition, AA 2024 showed the highest susceptibility to formation of ASBs followed by AA 2624 and AA 2017 in that order. On the other hand, AA 2024 has the least susceptibility in the artificially-aged condition. Occurrence of bifurcation of transformed bands in dynamic impacted specimens is dependent on temper condition, strain and strain rate. The mechanism of fracture of the precipitation hardened samples is typical of ductile fracture occurring sequentially by nucleation, growth, and coalescence of micro-voids processes within transformed band. Elongated grains were observed to arrest propagating shear band depending on the angle the band makes with elongated grains. The higher the angle of inclination of a shear band to the grain on its path, the higher the tendency of the grain to stop its propagation. Texture analysis of the impacted specimens of AA 2017-T451 and AA 2624-T351 shows that the former has a higher tendency for the evolution of ultra-fine DRX grains within the transformed shear band. High strain rate led to the development of CD//<111> orientations at the expense of CD//<110> orientations. Schmid factor calculations performed on few different orientations in the starting microstructure shows that CD//<110> is less susceptible to slip deformation and consequently underwent rotation to CD//<111>.
APA, Harvard, Vancouver, ISO, and other styles
5

Lam, Hon-Fai, and 林漢輝. "The analysis of microstructure characteristics and mechanical properties of 35NCD16 alloy steel under quasi-static and dynamic compression loading conditions." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/20307735199540287489.

Full text
Abstract:
碩士
國立成功大學
機械工程研究所
81
The purpose of this thesis is to investigate the misro- structure characteristics and mechanical properties of (NF) 35NCD16 high strength alloy steel under quasi-static and dynamic compression loading conditions. At the same time, deformation constitutive equation is used to descibe the plastic deformation behaviour of material properties. Quasi- static mechanical tests adopt the SAGINOMIYA 100 tons forging machine for testing material at low strain rate from 10^-2 to 1 s^-1, and the strainrange from 10% to 80%. Fro dymanic tests, one dimensional elastic wave theory as analysis a basis and the Hopkinson bar tester device are used to invesgate the impact properties of present material at high strain rate from 10^2 to 5*10^3 s^-1 and a low defor- mation from 5% to 25%.Form the result of mechanical tests analysis, it is found that the flow stress increases with the rise of strain rate. The strain rate sensitivity and the activation volume are changed with the incresing of strain rate and strain. Therefore, the different strain rate regions for deformation mechanism can be distinguished. The material deformation is maniniy controlled by thermally activated mech- anism as the strain rate regions for deformation is mainly controlled by thermally activated mechanism as the strain rate less than 10^3 s^-1. If the strain rate is larger than 10^3 s^ -1, the thermally activated meshanism will transform to a dis- location drag mechanism. Microstructural evaluation are made by (OM) AND (SEM) for observing the metallographic structer and the fracture behaviour.Furthermore, with (STEM), microstructure of this material, such as dislocation desity and dislocation cells is analysed and observed.
APA, Harvard, Vancouver, ISO, and other styles
6

(9178907), Ankit Agarwal. "Particle Mechanics and Continuum Approaches to Modeling Permanent Deformations in Confined Particulate Systems." Thesis, 2020.

Find full text
Abstract:
The research presented in this work addresses open questions regarding (i) the fundamental understanding of powder compaction, and (ii) the complex mechanical response of particle-binder composites under large deformations. This work thus benefits a broad range of industries, from the pharmaceutical industry and its recent efforts on continuous manufacturing of solid tablets, to the defense and energy industries and the recurrent need to predict the performance of energetic materials. Powder compacts and particle-binder composites are essentially confined particulate systems with significant heterogeneity at the meso (particle) scale. While particle mechanics strategies for modeling evolution of mesoscale microstructure during powder compaction depend on the employed contact formulation to accurately predict macroscopic quantities like punch and die wall pressures, modeling of highly nonlinear, strain-path dependent macroscopic response without a distinctive yield surface, typical of particle-binder composites, requires proper constitutive modeling of these complex deformation mechanisms. Moreover, continued loading of particle-binder composites over their operational life may introduce significant undesirable changes to their microstructure and mechanical properties. These challenges are addressed with a combined effort on theoretical, modeling and experimental fronts, namely, (a) novel contact formulations for elasto-plastic particles under high levels of confinement, (b) a multi-scale experimental procedure for assessing changes in microstructure and mechanical behavior of particle-binder composites due to cyclic loading and time-recovery, and (c) a finite strain nonlinear elastic, endochronic plastic constitutive formulation for particle-binder composites.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Quasi-static loading conditions"

1

Lach, R., and W. Grellmann. "Time-Dependent Fracture Behaviour of Polymers at Impact and Quasi-Static Loading Conditions." In Deformation and Fracture Behaviour of Polymer Materials, 3–21. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-41879-7_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Sharan Chandran, M., and K. Padmanabhan. "A Fractographic Study of PE, PP Self-reinforced Composites in Quasi-static Loading Conditions." In Lecture Notes in Mechanical Engineering, 603–18. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1071-7_50.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Tiamiyu, A. A., A. G. Odeshi, and J. A. Szpunar. "Deformation and Strengthening Mechanisms in AISI 321 Austenitic Stainless Steel Under Both Dynamic and Quasi-Static Loading Conditions." In TMS 2017 146th Annual Meeting & Exhibition Supplemental Proceedings, 191–202. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51493-2_19.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Diestmann, Thomas, Nils Broedling, Benedict Götz, and Tobias Melz. "Surrogate Model-Based Uncertainty Quantification for a Helical Gear Pair." In Lecture Notes in Mechanical Engineering, 191–207. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_16.

Full text
Abstract:
AbstractCompetitive industrial transmission systems must perform most efficiently with reference to complex requirements and conflicting key performance indicators. This design challenge translates into a high-dimensional multi-objective optimization problem that requires complex algorithms and evaluation of computationally expensive simulations to predict physical system behavior and design robustness. Crucial for the design decision-making process is the characterization, ranking, and quantification of relevant sources of uncertainties. However, due to the strict time limits of product development loops, the overall computational burden of uncertainty quantification (UQ) may even drive state-of-the-art parallel computing resources to their limits. Efficient machine learning (ML) tools and techniques emphasizing high-fidelity simulation data-driven training will play a fundamental role in enabling UQ in the early-stage development phase.This investigation surveys UQ methods with a focus on noise, vibration, and harshness (NVH) characteristics of transmission systems. Quasi-static 3D contact dynamic simulations are performed to evaluate the static transmission error (TE) of meshing gear pairs under different loading and boundary conditions. TE indicates NVH excitation and is typically used as an objective function in the early-stage design process. The limited system size allows large-scale design of experiments (DoE) and enables numerical studies of various UQ sampling and modeling techniques where the design parameters are treated as random variables associated with tolerances from manufacturing and assembly processes. The model accuracy of generalized polynomial chaos expansion (gPC) and Gaussian process regression (GPR) is evaluated and compared. The results of the methods are discussed to conclude efficient and scalable solution procedures for robust design optimization.
APA, Harvard, Vancouver, ISO, and other styles
5

"Variations of State under Dynamic and Quasi-Static Loading Conditions." In Physics of Strength and Fracture Control, 327–92. CRC Press, 2002. http://dx.doi.org/10.1201/9781420040722-11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

"Variations of State under Dynamic and Quasi- Static Loading Conditions." In Physics of Strength and Fracture Control. CRC Press, 2002. http://dx.doi.org/10.1201/9781420040722.ch4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bibik, Olena, and Oleksandr Popovich. "INCREASING THE EFFICIENCY OF ELECTRIC DRIVES WITH PERIODICAL LOADING BY USING COMPREHENSIVE MATHEMATICAL MODELING MEANS." In Priority areas for development of scientific research: domestic and foreign experience. Publishing House “Baltija Publishing”, 2021. http://dx.doi.org/10.30525/978-9934-26-049-0-31.

Full text
Abstract:
The mode of operation of induction motors (IMs) affects their performance. In most cases, motors are optimally designed for steady state operation. When operating in other modes, additional attention is required to the problems of energy efficiency. Induction motors are the most common type of electromechanical energy converters, and a significant part of them operate under conditions of periodic changes in the load torque. The work is devoted to solving the problem of increasing the energy efficiency of asynchronous motors of electromechanical systems with a periodic load, including pumping and compressor equipment. The traditional solution to this problem for compressor equipment is the optimal design of an IM under static conditions, as well as the use of flywheels, the use of an IM with an increased slip value and controlled IM with a squirrel-cage rotor and with frequency converters. In this work, the modes of operation of asynchronous motors with periodic loading are investigated. For this, complex mathematical models are developed in the simulation system. Such models are effective in modeling taking into account periodic load changes: repetitive transient processes, their possible asymmetry and non-sinusoidality, increased influence of nonlinearity of electromagnetic parameters. In complex mathematical modeling, the mutual influence of the constituent parts of the electromechanical system is taken into account. Simulation allowed quantifying the deterioration in energy efficiency under intermittent loading, in comparison with static modes. Criteria for evaluating quasi-static modes have been developed and areas of critical decrease in efficiency have been determined. The paper proposes and demonstrates a methodology for solving this problem. For this purpose, tools have been created for the optimal design of asynchronous motors as part of electromechanical systems with periodic loading. These tools include: complex mathematical models of electromechanical systems with asynchronous motors with periodic load, mathematical tools for determining the parameters of quasi-steady-state modes, the methodology of optimal design based on the criterion of the maximum efficiency of processes under quasi-steady-state modes of operation. The possibilities, advantages and prospects of using the developed mathemati-cal apparatus for solving a number of problems to improve the efficiency of electric drives of compressor and pumping equipment are demonstrated. It is shown that by taking into account quasi-static processes, the use of complex mathematical models for the optimal design of asynchronous motors with a periodic load provides an in-crease in efficiency up to 8 ... 10%, relative to the indicators of motors that are de-signed without taking into account the quasi-static modes. The areas of intense quasi-steady-state modes are determined using the devel-oped criterion. In these areas, there is a critical decrease in efficiency compared to continuous load operation. A decrease in efficiency is associated with a decrease in the amount of kinetic energy of the rotating parts compared to the amount of electromagnetic energy. In connection with the development of a frequency-controlled asynchronous drive of mechanisms with a periodic load, the relevance of design taking into account the peculiarities of quasi-static has increased significantly. For example, a variable frequency drive of a refrigerator compressor or a heat pump can increase energy efficiency up to 40%, but at low speeds, due to a decrease in kinetic energy, the efficiency can decrease to 10 ... 15%, unless a special design methodology is applied. This problem can be solved by using the complex mathematical modeling tools developed in the article.
APA, Harvard, Vancouver, ISO, and other styles
8

Kubade, Pravin R., Amol N. Patil, and Hrushikesh B. Kulkarni. "Structure Properties Relationship Studies of Vinyl Ester Hybrid Syntactic Foam." In Handbook of Research on Advancements in Manufacturing, Materials, and Mechanical Engineering, 368–94. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4939-1.ch018.

Full text
Abstract:
Syntactic foam is the porous composite produced by mixing prefabricated hollow spherical particle into the matrix. Syntactic foams are used as energy absorption sandwich core for several applications like marine, automotive, and aerospace. In this work, low density hollow glass microspheres are hybridized with fly ash cenosphere in Bisphenol-A epoxy-based vinyl ester matrix. Hybrid syntactic foams is created with 60% total filler content. Within these hybrid systems internal composition of two fillers were varied in a step of 25 vol% with respect to each other. Hybrid syntactic foams are prepared by the hand lay-up (molding) method. The physical characterization parameter contains density and matrix porosity whereas tensile, quasi-static compression, flexural (3-point bending), Izod impact, and micro Vickers hardness are grouped as mechanical characterization parameters. Scanning electron microscopy was performed on fractured surfaces to examine deformation and fracture mechanisms related with each loading condition.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Quasi-static loading conditions"

1

Abdel-Haq, M., and G. Newaz. "Modeling the Crushing Response of PMC Tubes Under Quasi-Static and Dynamic Loading Conditions." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32952.

Full text
Abstract:
Non-linear finite element technique was used to predict the crushing response and energy absorption of fiberglass/polyester tubes under quasi-static and dynamic conditions. The major failure modes including axial splitting of the tube wall and delamination were modeled using the available features in LSDYNA and ABAQUS codes for dynamic and quasi-static analysis, respectively. The results show that the finite element models were able to predict the average and peak load levels for the tubes with and without using an external constraint. Finally, it was concluded that modeling the major failure modes in the crushing process in addition to using an appropriate material failure model is essential to capture the load levels and specific energy absorption of the crushed tubes.
APA, Harvard, Vancouver, ISO, and other styles
2

Pająk, Małgorzata, and Jacek Janiszewski. "Steel fibre reinforced self-compacting concrete subjected to quasi-static and dynamic loading conditions." In 3RD NATIONAL CONFERENCE ON CURRENT AND EMERGING PROCESS TECHNOLOGIES – CONCEPT 2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0007804.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Carolan, Michael E., David Y. Jeong, A. Benjamin Perlman, Yim H. Tang, and Francisco Gonza´lez. "Deformation Behavior of Welded Steel Sandwich Panels Under Quasi-Static Loading." In 2011 Joint Rail Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/jrc2011-56054.

Full text
Abstract:
For the past two decades, the Federal Railroad Administration (FRA) Office of Research and Development has sponsored research conducted by the Volpe National Transportation Systems Center (Volpe Center) in safety matters related to the transportation of hazardous materials by railroad tank cars. Recent research conducted by the Volpe Center has included the application of semi-empirical and computational (i.e., finite element analysis) methods to estimate the puncture resistance of conventional railroad tank cars under generalized head and shell impact scenarios. Subsequent work identified sandwich structures as a potential technology to improve the puncture resistance of the commodity-carrying tank under impact loading conditions. This paper summarizes basic research (i.e., testing and analysis) conducted to examine the deformation behavior of flat-welded steel sandwich panels under two types of quasi-static loading: (1) uniaxial compression; and (2) bending through an indenter. The objectives of these tests were to: (1) confirm the analytical and computational (i.e., finite element) modeling of sandwich structures, (2) examine the fabrication issues associated with such structures (e.g., material selection and welding processes), and (3) observe the deformation behavior and local collapse mechanisms under the two different types of loading. In addition, the uniaxial compression tests were performed to rank or screen different core geometries. Five core geometries were examined in the compression tests: pipe or tubular cores with outer diameters equal to 2, 3, and 5 inches; a 2-inch square diamond core; and a double-corrugated core called an X-core with a 5-inch core height. The compression tests showed excellent repeatability of structural (i.e., force-crush) response for panels with similar cores and welding. The 3-inch pipe core and the diamond core were selected as candidate cores for the next test series because they possess attributes of moderate strength and moderate relative density. In addition, force-crush curves calculated from finite element analysis were in reasonable agreement with the measured curves for all cores. Bend tests using a 12-inch by 12-inch indenter with 1-inch radius rounded edges were also conducted. The panels were simply-supported over 4-inch diameter rollers spanning 24 inches between the centers of the rollers. The bend tests included three variables: (1) core type (diamond core and 3-inch pipe core); (2) core orientation relative to the supports (cores running either parallel or perpendicular to the rollers used to support the panels); and (3) face sheet type (solid plates on both sides, strips used as face sheets on both sides, and a combination of solid plates and strips. Finite element analysis of the bend tests produced nearly identical shapes to the measured force-displacement curves.
APA, Harvard, Vancouver, ISO, and other styles
4

Kiapour, Ata M., Carmen E. Quatman, Richard C. Ditto, Jason W. Levine, Samuel C. Wordeman, Timothy E. Hewett, Vijay K. Goel, and Constantine K. Demetropoulos. "Global Quasi-Static Mechanical Characterization of the Human Knee Under Single- and Multi-Axis Unconstrained Loading Conditions." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80676.

Full text
Abstract:
A substantial number of knee injuries are reported in the United States annually, and are principally observed among young athletes. ACL (anterior cruciate ligament) injury is one of the most common and devastating knee injuries [1]. Many factors influence such injuries, from anatomical variability to magnitude and direction of loading. A better understanding of knee biomechanics and injury mechanisms may improve current preventative, surgical and rehabilitation strategies, and thus, mediate injury risk. Considerable study of knee joint biomechanics under various modes of loading has been undertaken [2–4]. Additional work is needed to characterize the effects of different loading factors on knee biomechanics, especially ACL loading patterns under more physiologically relevant conditions. The purpose of this study is to develop a new technique to investigate the effects of various single- and multi-axes loading conditions on knee kinematics, ACL and MCL (medial collateral ligament) strains, and TF (tibiofemoral) articular cartilage pressure distribution under quasistatic loading conditions that simulate various weight bearing activities.
APA, Harvard, Vancouver, ISO, and other styles
5

Tippur, Hareesh V., and Liming Xu. "Real-time shearing interferometry for studying interfacial crack tip fields under quasi-static and dynamic loading conditions." In SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, edited by Malgorzata Kujawinska, Ryszard J. Pryputniewicz, and Mitsuo Takeda. SPIE, 1995. http://dx.doi.org/10.1117/12.211883.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Tran, V. X., P. C. Lin, Jwo Pan, T. Pan, and T. Tyan. "Failure Loads of Spot Friction Welds in Aluminum 6111-T4 Sheets under Quasi-Static and Dynamic Loading Conditions." In SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-0983.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Kim, Jin Weon, Myung Rak Choi, and Yun Jae Kim. "Fracture Behavior of Aged CF8A Austenite Cast Stainless Steel Under Dynamic and Cyclic Loading Conditions." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65676.

Full text
Abstract:
This study conducted J-R fracture toughness tests using aged CF8A cast austenitic stainless steel (CASS) under dynamic and cyclic loading conditions at room temperature (RT) and 316°C and investigated the effect of seismic loading characteristics on the fracture behavior of age-related degraded material. For comparison, J-R fracture tests were also conducted on unaged CF8A CASS. CF8A CASS was made as a static casting, and it was aged thermally at 400°C for 175 days, which is equivalent to thermal aging at the operating temperature of nuclear power plants (NPPs) for 32 effective full power years (EFPYs). Monotonic J-R tests were conducted at both quasi-static and dynamic loading rates, and cyclic J-R tests were conducted at a quasi-static loading rate. The results showed that the fracture resistance of aged CF8A CASS under monotonic load was lower, by ∼35%, than that of unaged CF8A CASS, regardless of test temperatures and loading rates. The dynamic loading effect on fracture behavior was almost negligible for both unaged and aged CF8A CASSs at RT and 316°C. Cyclic loading reduced J-R fracture toughness of unaged CF8A CASS considerably at both test temperatures. Such a cyclic loading effect on fracture behavior was still observed from aged CF8A CASS. Thus, we conclude that the dynamic and cyclic loading effects on fracture behavior of CF8A CASS were not altered by thermal aging at the operating temperature of NPPs for 32 EFPYs.
APA, Harvard, Vancouver, ISO, and other styles
8

Nam, Hyun-Suk, Ji-Soo Kim, Yun-Jae Kim, Jin-Weon Kim, and Chang-Young Oh. "Ductile Fracture Simulation Considering Strain Rate Loading Effect." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45204.

Full text
Abstract:
This paper is based on a ductile failure simulation under dynamic loading conditions using finite element (FE) analyses. Recently a simple finite element method in a quasi-static test has been proposed to implement fracture simulation based on the well-known stress modified fracture strain model. The stress-modified fracture strain model is determined to be incremental damage in terms of stress triaxiality and fracture strain for dimple fracture from tensile test result with FE analyses technique. Since dynamic loading effect is especially important to assess pipe with crack-like defect, this work propose the integrated model which combines quasi-static with dynamic loading effect. In order to validate stress-modified fracture strain model in dynamic loading conditions, this paper compares results of FE analysis using proposed method with strain dependent smooth bar tests and notch tensile tests using Johnson-Cook equation. In conclusion, the stress-modified fracture strain model criterion can be calibrated by FE analyses with strain rate dependent fracture toughness test results.
APA, Harvard, Vancouver, ISO, and other styles
9

Zheng, W., D. Bibby, J. Li, J. T. Bowker, J. A. Gianetto, R. W. Revie, and G. Williams. "Near-Neutral pH SCC of Two Line Pipe Steels Under Quasi-Static Stressing Conditions." In 2006 International Pipeline Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ipc2006-10084.

Full text
Abstract:
Most published SCC results for the near-neutral pH condition were produced under cyclic loading. However, the presence of stress corrosion cracks in pipeline systems involving very small pressure fluctuations suggests the cracking should initiate and grow without large dynamic loads. This study was designed to investigate this issue. A Grade 448 (X-65) line pipe steel and a prototype Grade 550 (X-80) steel were evaluated in near-neutral pH solutions. The maximum stress applied was at 95% of the respective yield strengths and the R values applied were between 0.98 and 1.0. Two solutions were used for each steel: NS4 and NS4/clay mixture. The solutions were purged with a gas mixture of 95%N2 and 5%CO2. Recognizing that the crack propagation rate can be very slow under such near-static conditions, relatively long-term tests were carried out. The durations of the three tests using the prototype Grade 550 (X-80) steel were 110 days, 54 days and 26 days, and the duration for the X-65 steel was 110 days. After 110 days, the majority of the cracks in the Grade 550 (X-80) steel were in the range of 5 to 30 micrometers (μm) deep, giving an average crack propagation rate of 2*10−9 mm/s. Tests at short durations revealed that only a few cracks were detectable after 26 days and that several more cracks were produced after 54 days. So majority of the cracks in the 110-day were likely produced after 54 days of testing. The NS4/clay mixture was found to be less aggressive than the NS4 solution for both steels studied. The cracks in the prototype Grade 550 (X-80) steel were deeper and more numerous in comparison with the X-65 steel. Possible reasons for this observation are also explored in terms of the presence of martensite-austenite (MA) phase in the Grade 550 (X-80) steel.
APA, Harvard, Vancouver, ISO, and other styles
10

Zhang, Runyu, Huiluo Chen, Sadeq Malakooti, Simon Oman, Bing Wang, Hongbing Lu, and Huiyang Luo. "Quasi-Static and Dynamic Confined Compressive Behavior of Glass Beads by In-Situ X-Ray Micro-Computed Tomography." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23399.

Full text
Abstract:
Abstract Granular materials are one of the most important materials in several industries such as civil engineering, agriculture, and energy production. They are a collection of distinct macroscopic particles. Although these materials appear very simple to be described, they exhibit highly different mechanical behavior under quasi-static and dynamic loading conditions. Traditionally, glass beads have been considered as a benchmark granular material for the fundamental understanding of the mechanics of granular materials under complex mechanical loadings. In this study, we intend to characterize the compressive behavior of glass beads under confinement using in-situ X-ray micro-computed tomography at low (quasi-static) and high strain (dynamic) rates. At high strain rates, samples with similar bulk densities to the quasi-static samples are compressed using a long split Hopkinson pressure bar and later imaged with the tomography system to acquire their volumetric images. In the case of low strain rates, a similar sample is compressed, and subsequently, its volumetric images are captured at the same strain level as the dynamically compressed samples using the long split Hopkinson pressure bar. The volumetric images for each case are then analyzed to determine three-dimensional morphologies and to investigate and compare the damage and crushing characteristics of the glass beads at quasi-static and dynamic loading conditions.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Quasi-static loading conditions"

1

Broome, Scott Thomas, Timothy W. Scofield, Stephen Tedford Montgomery, Stephen J. Bauer, and John H. Hofer. Phase transformation of PZST-86/14-5-2Nb ceramic under quasi-static loading conditions. Office of Scientific and Technical Information (OSTI), February 2010. http://dx.doi.org/10.2172/984102.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Montgomery, Stephen Tedford, Moo Yul Lee, Diane A. Meier, and John H. Hofer. Phase transformation of "chem-prep" PZT 95/5-2Nb HF1035 ceramic under quasi-static loading conditions. Office of Scientific and Technical Information (OSTI), July 2006. http://dx.doi.org/10.2172/888995.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lee, Moo Yul, Stephen Tedford Montgomery, and John H. Hofer. Phase transformation of poled "chem-prep" PZT 95/5-2Nb ceramic under quasi-static loading conditions. Office of Scientific and Technical Information (OSTI), October 2004. http://dx.doi.org/10.2172/919629.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Brannon, Rebecca Moss, Moo Yul Lee, and David R. Bronowski. Uniaxial and triaxial compression tests of silicon carbide ceramics under quasi-static loading condition. Office of Scientific and Technical Information (OSTI), February 2005. http://dx.doi.org/10.2172/920770.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Quasi-static loading conditions' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography