Search results for: torsion - Bridge of Knowledge

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Search results for: torsion

Search results for: torsion

  • Continuum models for pantographic blocks with second gradient energies which are incomplete

    Publication
    • M. Stiltz
    • F. dell'Isola
    • I. Giorgio
    • V. Eremeev
    • G. Ganzmuller
    • S. Hiermaier

    - MECHANICS RESEARCH COMMUNICATIONS - Year 2022

    We postulate a deformation energy for describing the mechanical behavior of so called pantographic blocks, that is bodies constituted by stacking of layers of pantographic sheets. We remark that the pantographic effect is limited in the plane of pantographic sheets and therefore only the second derivatives of transverse displacements along the pantographic fibers appear in the chosen deformation energy. We use this novel energy...

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  • Process zone in the Single Cantilever Beam under transverse loading. - Part I: Theoretical analysis

    Publication

    - THEORETICAL AND APPLIED FRACTURE MECHANICS - Year 2011

    Single Cantilever Beam (SCB) specimen loaded with a transverse force parallel to the crack front is proposed for the analysis of crack propagation phenomena under mixed mode conditions. The stress redistribution in the adhesive layer in the vicinity of the crack front so as the beam deformation are estimated using a Timoshenko beam on elastic foundation model. This model emphasizes the Mode II contribution due to flexural beam...

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  • 2022-2023 - Strenght of materials towards applications, PG_00053661

    e-Learning Courses
    • M. K. Gerigk

    The course is mainly dedicated to the DAPE Students.  From the theoretical point of view the course consists of the following problems to be discussed during the lectures and exercises: -fundamentals of strength of materials -basic structures and environment -loads on structures -strength of materials: tension, stress, analysis of stress and strain, bending moments and shearing forces, longitudinal and shearing stress in beams,...

  • Strenght of materials towards applications , PG_00053661

    e-Learning Courses
    • M. K. Gerigk

    The course is dedicated to the DAPE WIMiO Students.  From the theoretical point of view the course consists of the following problems to be discussed during the lectures: -fundamentals of strength of materials -basic structures and environment -loads on structures -strength of materials: tension, stress, analysis of stress and strain, bending moments and shearing forces, longitudinal and shearing stress in beams, bending stress...

  • Multiaxial Fatigue Behaviour of SLM 18Ni300 Steel

    Publication
    • R. Branco
    • J. D. Costa
    • J. A. M. Ferreira
    • C. Capela
    • F. Berto
    • W. Macek

    - Structural Integrity - Year 2022

    Fatigue behaviour of SLM 18Ni300 steel under proportional bending-torsion loading is studied. The fatigue tests are conducted under pulsating loading conditions using tubular specimens with a transversal circular hole. Three ratios of the normal stress to shear stress are considered, namely σ/τ=4,σ/τ=2 and σ/τ = 4/3. Crack initiation sites were found for two diametrically opposite points around the hole, whose locations are governed...

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  • STRENGTH of MATERIALS TOWARDS APPLICATIONS (2024)

    e-Learning Courses
    • M. K. Gerigk

    The SMTA DATE Course consists of the following problems to be discussed during the lectures: - Introduction to strength of materials towards applications - Fundamentals of modelling in strength of materials towards applications - Materials and basic structures - Fundamentals of modelling in strength of materials towards applications - Definition of environment and loads - General, energy-based and advanced methods for analysis...

  • π-Stacking attraction vs. electrostatic repulsion: competing supramolecular interactions in a tpphz-bridged Ru(ii)/Au(iii) complex

    Publication
    • D. Sorsche
    • M. Schaub
    • F. Heinemann
    • J. Habermehl
    • S. Kuhri
    • D. Guldi
    • J. Guthmuller
    • S. Rau

    - DALTON TRANSACTIONS - Year 2016

    The synthesis and characterization of a mixed metal ruthenium(II)/gold(III) complex bridged by tetrapyridophenazine (tpphz) are described. It is isostructural and isoelectronic to the well-known photocatalysts with palladium(II) or platinum(II). Concentration dependent 1H-NMR spectroscopy and XRD studies show that the electrostatic repulsion between the gold(III) moieties exceeds the attractive π-stacking interaction. Theoretical...

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  • Mechanical behaviour of the implant used in human hernia repair under physiological loads

    In laparoscopic operations of abdominal hernias some recurrences still take place, even when applying a surgical mesh. This is usually caused by a failure of the connection between the tissue and the implant. The study deals with the influence of an implant’s orientation on forces in joints, which connect the mesh to human tissues. In the paper, the implant is modelled as a membrane structure within framework of the Finite Element...

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  • Comparison of different one-parameter damage laws and local stress-strain approaches in multiaxial fatigue life assessment of notched components

    Publication
    • R. Branco
    • J. D. Costa
    • L. Borrego
    • F. Berto
    • S. M. N. Razavi
    • W. Macek

    - INTERNATIONAL JOURNAL OF FATIGUE - Year 2021

    This paper aims to compare the predictive capabilities of different one-parameter damage laws and local stress-strain approaches to assess the fatigue lifetime in notched components subjected to proportional bending-torsion loading. The tested fatigue damage parameters are defined using well-known stress-based, strain-based, SWT-based and energy-based relationships. Multiaxial cyclic plasticity at the notch-controlled process zone...

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  • On local buckling of cold-formed channel members

    Publication

    The paper deals with local buckling of the compressed flanges of cold-formed thin-walled channel beams subjected to pure bending or axially compressed columns. Arbitrarily shaped flanges of open cross-sections and the web-flange interactions are taken into account. Buckling deformation of a beam flange is described by displacement related to torsion of the flange about the line of its connection with the web. Total potential energy...

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  • LCF behavior of 2024AA under uni- and biaxial loading taking into account creep pre-deformation

    Publication

    - ENGINEERING FRACTURE MECHANICS - Year 2024

    This study presents the results of experimental low-cycle fatigue (LCF) tests of aluminum 2024 alloy T3511 temper in uni- and biaxial loading states. Tests were carried out on both the as-received material (hardened extruded rods) and material with different pre-deformation histories. These deformations were carried out in the creep process at 200 °C and 300 °C for two different levels of at each temperature. The pre-deformed material’s...

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  • Estimation of nonstructural stiffness in instrumented steel frames

    Publication

    - ENGINEERING STRUCTURES - Year 2022

    Lateral stiffness of nonstructural components may significantly influence the initial stiffness of the entire structure and consequently alter its dynamic characteristics. While methods for simulating structural members are well-established, approaches for modeling nonstructural components that also participate in seismic response are notably less developed. In this paper a simplified, physically-intuitive approach for estimating...

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  • (R,R)-1-Acetyl-1'-(2,4,6-trinitrophenyl)-2,2'-bipyrrolidine

    (R,R)-1-Acetyl-1'-(2,4,6-trinitrophenyl)-2,2'-bipyrrolidine has been synthesized and its rentgenostructure has been determined. The structure of the title molecule, C16H19N5O7, is mainly determined by the steric effect of a bulky 2,4,6-trinitrophenyl group attached to the N atom of a pyrrolidine ring. Both pyrrolidine rings adopt an envelope conformation, with one of the methylene C atoms as the flap in each case, and the N-C-C-N...

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  • BODIPY‐Perylene Charge Transfer Compounds; Sensitizers for Triplet‐Triplet Annihilation Up‐conversion

    Publication
    • R. A. Arellano-Reyes
    • A. Prabhakaran
    • R. C. Sia
    • J. Guthmuller
    • K. K. Jha
    • T. Yang
    • B. Dietzek‐Ivanšić
    • V. McKee
    • T. E. Keyes

    - CHEMISTRY-A EUROPEAN JOURNAL - Year 2023

    BODIPY heterochromophores, asymmetrically substituted with perylene and/or iodine at the 2 and 6 positions were prepared and investigated as sensitizers for triplet-triplet annihilation up conversion (TTA-UC). Single-crystal X-ray crystallographic analyses show that the torsion angle between BODIPY and perylene units lie between 73.54 and 74.51, though they are not orthogonal. Both compounds show intense, charge transfer absorption...

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  • Debonding of coin-shaped osseointegrated implants: Coupling of experimental and numerical approaches

    Publication
    • Y. Hériveaux
    • S. Le Cann
    • K. Immel
    • E. Vennat
    • V. Nguyen
    • V. Brailovski
    • P. Karasinski
    • R. Sauer
    • G. Haiat

    - Journal of the Mechanical Behavior of Biomedical Materials - Year 2023

    While cementless implants are now widely used clinically, implant debonding still occur and is difficult to anticipate. Assessing the biomechanical strength of the bone–implant interface can help improving the understanding of osseointegration phenomena and thus preventing surgical failures. A dedicated and standardized implant model was considered. The samples were tested using a mode III cleavage device to assess the mechanical...

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  • Medium-sized cyclic bis(anisylphosphonothioyl)- disulfanes and their corresponding cyclic sulfane-structures and most characteristic reactions

    Cyclic 8-, 9-, 10-, and 12-membered bis(anisylphosphonothioyl)disulfanes were synthesized. Next, structurally related 7 to 9-membered cis and trans sulfanes were isolated as a result of sulfur atom extrusion from the parent cyclic disulfanes. The results of the desulfurization of the disulfanes were compared to the results obtained for desulfurization of the respective bis(anisylphosphodithioates). Cyclic disulfanes predominantly...

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  • Wiktoria Wojnicz dr hab. inż.

    DSc in Mechanics (in the field of Biomechanics)  - Lodz Univeristy of Technology, 2019 PhD in Mechanics (in the field of Biomechanics)  - Lodz Univeristy of Technology, 2009 (with distinction)   List of papers (2009 - ) Wojnicz W., Wittbrodt E., Analysis of muscles' behaviour. Part I. The computational model of muscle. Acta of Bioengineering and Biomechanics, Vol. 11, No.4, 2009, p. 15-21 Wojnicz W., Wittbrodt E., Analysis of...