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Thursday, August 26, 2021 | History

1 edition of Quasi-static viscoelasticity loading measurements of an aircraft tire found in the catalog.

Quasi-static viscoelasticity loading measurements of an aircraft tire

Quasi-static viscoelasticity loading measurements of an aircraft tire

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Published by National Aeronautics and Space Administration, Langley Research Center, NASA Center for AeroSpace Information in Hampton, Va, Linthicum Heights, Md .
Written in English

    Subjects:
  • Airplanes -- Tires -- Testing.,
  • Space shuttles -- Tires -- Testing.

  • Edition Notes

    StatementAngela J. Mason and John A. Tanner, Arthur R. Johnson.
    SeriesNASA technical memorandum -- 4779, ARL technical report -- 1402, Army Research Laboratory technical report -- ARL-TR-1402.
    ContributionsJohnson, Arthur R., Mason, Angela J., Tanner, John A., Langley Research Center., U.S. Army Research Laboratory., United States. National Aeronautics and Space Administration.
    The Physical Object
    Pagination20 p. :
    Number of Pages20
    ID Numbers
    Open LibraryOL20725006M

      The Effects of Detailed Tire Geometry on Automobile Aerodynamics - a CFD Correlation Study in Static Conditions A correlation study was performed between static wind tunnel testing and computational fluid dynamics (CFD) for a small hatchback vehicle, with the intent of evaluating a variety of different wheel and tire designs for. Three different mechanisms for interfacial friction damping in nanotube films were identified in this paper. These include: 1) Energy dissipation due to inter-tube interactions, 2) Energy dissipation due to nanotube-polymer interactions and 3) Energy dissipation due to .   The tire is one of the key components that affect vehicle performance and ride quality. The rigid ring model has been widely used in the dynamic simulation of tire rolling uneven road surface, and calculate the tire stiffness and force of rim under quasi-static conditions.


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Quasi-static viscoelasticity loading measurements of an aircraft tire Download PDF EPUB FB2

Quasi-static viscoelasticity loading measurements of an aircraft tire [microform] Angela J. Mason and John A.

Tanner, Arthur R. Johnson National Aeronautics and Space Administration, Langley Research Center ; National Technical Information Service, distributor Hampton, Va.

: [Springfield, Va. Wikipedia Citation. computational part of an effort in which the quasi-static viscoelastic loading and unloading of an aircraft tire was measured and computationally simulated.

The experimental effort and the load measurements have been reported elsewhere. 10 In several previous studies viscoelastic. Planman, W.

Server, in Comprehensive Nuclear Materials, Dynamic Versus Static Fracture Toughness. The Master Curve concept, developed originally for quasistatic loading condition, has proven to be useful for dynamic K Jd tests conducted at a high loading rate.

Assuming that only the value of T 0 is rising (along with the material yield strength) with increasing loading rate. load can be considered static, quasi-static, or dynamic.

This characteristic time is the fundamental period of free vibration of the system. Dynamic Load Magnification factor (DLF) is the ratio of the maximum dynamic force experienced by the system and the maximum applied load. The small period of vibration results in a small DLF.

He conducted the quasi-static, 2D analysis on contact pressure, vertical tire stiffness and stress which are affected by spoke structures and shear band by creating two NPTs, a tire with a composite ring and another without composite ring.

The results showed that shape and size of spokes has effect on tire behavior and the shear layer reduces the. Cent. Eur. Eng. 3(2) DOI: s Central European Journal of Engineering Thermomechanical analysis of an aircraft tire in. Displacement measurements were also taken and used to calculate beam rotations.

Comparisons between static and quasi-dynamic responses are presented, along with a comparison of energy absorbed by the system. Results show that the speed of the applied load matters when considering the response of the system to interactive forces and moments.

this case, the equivalent static load may be as much as one order of magnitude more conservative than the true dynamic load in terms of the resulting stress levels.

Load Specification Ideally, the dynamics engineer and the static stress engineer would mutually understand, agree upon, and document the following parameters for the given component.

Quasi-static tensile test - introduction. January DOI: _ In book: Polymer Solids and Polymer MeltsMechanical and Thermomechanical Properties of Polymers (pp tire and the road, the power dissipation of the radial-ply tire could be as low as 60 of that of the bias-ply tire under similar conditions, and the life of the radial-ply tire could be as long as twice that of the equivalent bias-ply tire [].

For a radial-ply tire, there is a relatively uniform ground pressure over the entire contact area. A quasi-static stress analysis in AbaqusStandard: is used to analyze problems with time-dependent material response (creep, swelling, viscoelasticity, and two-layer viscoplasticity); is used when inertia effects can be neglected; and can be linear or nonlinear.

relationship between the radial deformation and radial load is developed as a linear quasi-static model, the nonlinear stiffness relationship between the vertical spindle load and the vertical tire deflection that exists in real tires is captured by the model via the unidirectional geometric boundary condition at the tire-road interface.

two subclasses of problems related to tire mechanics which encompass some signifi-cant and complex features of tire behavior: 1) The general rolling contact problem of finite deformation of a flexible, viscoelastic cylinder in steady-state motion on a rough foundation (roadway) 2) The finit~ deformation of cord-reinforced rubber composites.

Quasi-static Analysis Following conventional tensile analysis, the engineering stress in the fi ber is calculated as where A is the cross-sectional area of the fi ber. The engineering strain is calculated as Where L is the original length of the fi ber, and ΔL is the change in length. A plot of stress vs.

strain is a useful way to identify key. to input ultimate flight condition parameters (load factor, dynamic pressure and pitch rate) into the static aeroelastic optimisation module, and then the wing structural size and weight can be estimated efficiently by Nastran.

Static aeroelastic equation The basic equation (9) for the static aeroelastic analysis of an aircraft is. Find many great new used options and get the best deals for Quasi-static Viscoelastic Finite Element Model of an Aircraft Tire at the best online prices at. Lateral and force-and-aft spring constants and damping factors of a 49 x 17 size aircraft tire for different tire pressure and vertical loads were measured assuming a rate-independent damping form.

maximum inflation pressure of MPa and maximum load capacity of kg obtained from the tyre size specification load index. The results obtained from the study show that the tyre material developed from Natural RubberOrganomodified kaolin will perform well under static structural analysis, as the.

An aircraft tire is constructed for the purpose it serves. Unlike an automobile or truck tire, it does not have to carry a load for a long period of continuous operation. However, an aircraft tire must absorb the high impact loads of landing and be able to operate at high speeds even if only for a short time.

As shown previously in sectionall displacement levels applied induce strains that remain in the elastic and viscoelastic parts of quasi-static behavior of this composite.

Then, the evolution of residual strength can be obtained using the formula mentioned below, as specified by the ASTM D standard for 3-points flexural tests. Costal cartilage (CC) is one of the load-bearing tissues of the rib cage.

Literature on material characterisation of the CC is limited. Atomic force microscopy (AFM) has been extremely successful in characterising the elastic properties of soft biomaterials such as articular cartilage and hydrogels, which are often the material of choice for cartilage models.

This causes the load factor 'n' to be greater than 1. Creating inertia load on the structure to be nMg, where: n 1 V 2 Rg. R Radius of curvature of the flight path. Steady Banked Turn. The aircraft flies in a horizontal turn without any sideslip and at a constant speed.

where: n sec φ; tan φ V 2 gR, for φ 60 o, n 2 Static. tires operated at typical loads and inflation pressures. The field study showed that tire inflation pressures are much higher on the road than those typically used in design procedures or even in analysis.

Truck tire pressures average between 95 and psi on the road and psi is typically used in design. Static and Dynamic Structural Response of an Aircraft Wing with Damage Using Equivalent Plate Analysis A process to generate an equivalent plate based on an optimization approach to predict the static and dynamic response of flight vehicle wing structures is proposed.

Geometric-scale and frequency-scale factors are defined to construct an equivalent plate with any desired scale to use in. A finite element tire model has been used to examine pavement pressure distributions developed by statically loaded aircraft tires.

This paper briefly describes the tire model's characteristics and presents load versus deflection curves and pavement pressure distributions calculated for three different aircraft tires.

specific energy represents state of aircraft. Units are in feet. Curves are universal P s (TW-DW)V specific excess power Represents ability of aircraft to change energy state. Curves depend upon aircraft (thrust and drag) Maybe used to climb andor accelerate Function of altitude Function of load factor.

Loading was applied on the floor boards of the fuselage, on a temporary frame on top of the fuselage and, for side loading, via a horizontal cable from a tubular member carried in two wooden frames fitted to the fin, and then over a large diameter pulley to a weight platform.

generic load line r S a m. of r. of r. Table lists the coordinates on the S a-S m diagram where the load line intersects the Langer and the Goodman lines. (Goodman). These are two eqns in two unknowns S a and S m, as r σ a m is considered known). These are two eqns in two unknowns S a and S m, as r σ a σ is considered known.

the emergence of the tire sensor concept, it is expected that such a gap can be lled. A tire sensor system provides direct measurements of tire operating states such as tire component deformations, and then estimates vehicle states, including the friction potential [1], lateral force [2], and contact patch dimension [3].

Various tire sensors. The subject of pavement loading by aircraft is treated by presenting a series of tables and figures designed to cover the essentials of pavement loading through the various phases of aircraft operation.

The phases in-clude static, slow taxi, steady-state turnsat various speeds and turn radii, takeoff roll, roughness, landing impact, and braking.

In addition to this load, we assumed, dynamic load of kg is acting on frame. Thus frame which bears load of kg is supposed to be design. Europian frame model was considered while designing this frame.

Here, we can use C section channel of Mild-Steel. From design data book, dimensions of C section channel are finelised. 0. A quasi-static process is in equilibrium at all times, tracing a well-defined trajectory in thermodynamic phase space. If you can follow that trajectory in the opposite direction, the process is called reversible.

It is not enough to find another trajectory that brings you back to the initial state. This paper experimentally investigated the seismic behavior of a reduced-scale model of concrete-encased steel frame-reinforced concrete core tube building. The quasi-static testing with multipoint loading was carried out, and mode-superposition response spectrum method was adopted to control the amplitude of displacement.

The damage process, crack pattern, and failure mode were observed. static tension and compression testing, aspects of fatigue andor durability, and even fracture mechanics. Traditional materials testing systems allow for larger specimens to be evaluated.

This is particularly important with stiffer polymers, composites (like sections of a tire tread), and pavement materials where a larger volume of material. PROCEEDINGS VOLUME Smart Structures and Materials Industrial and Commercial Applications of Smart Structures Technologies.

Adapted from the book Viscoelastic Materials and from selected research articles accessible via the main viscoelasticity page above. For an elastic two-phase composite, the stiffness of Voigt and Reuss composites represent rigorous upper and lower bounds on the Young's modulus for a given volume fraction of one phase.

The risk of traffic accidents may rise significantly when the skid resistance is lower than a certain threshold []. The skid resistance is measured as a resistive drag force, generally using the locked-wheel, dynamic friction tester or grip tester with standard testing tires or rubber sliders [].

The pavement interface friction is affected by many factors, such as vehicle factors (load, speed. In fact, the term "quasi-static process" is a misnomer because what it designates it is not a process at all but a range of constrained equilibrium states. Giving this range of constrained equilibrium states determines nothing about the various actual possible processes that could navigate the system from one equilibrium state to the next.

This thesis presents a method for: (1) Correlating experimental load-deflection diagrams for aircraft tires. (2) Analytically determining the vertical tire deflection.

(3) Developing an equation for the rolling coefficient of friction;Results obtained by this analysis were compared with measure deflections at aircraft tires in which as much as 50 deflection is allowed.

Viscoelasticity and F1 tyres. Formula 1 aerodynamics is all about utilising a viscous fluid, to maximize the forces generated by a viscoelastic solid. As Mark Hughes explained in last week's Autosport, an F1 tyre generates grip by two different mechanisms: physical grip and chemical adhesion.

The latter is only triggered when the tyre reaches a. Tire/Pavement Force Tensor Differential Evaluation Between Dynamometric Wheel and Infrastructure-Based System The Effect of Cracks Interaction on the Critical Strain in Orthotropic Heterogeneous Material Under Compressive Static Loading.

B. Winiarski, I. A. Guz. IMECE Deep Learning for Intelligent Bubble Size Detection in the.Tire Inflation Pressure and Load Tire inflation pressure determines the tire elasticity and combination with load, determines the deflection in the sidewalls and contact region.

The overall effect of rolling resistance is depends on the elasticity of the ground. On the soft surfaces like sand, high inflation pressure results in. Hence we tend to define the static load patterns to verify this, yet most engineers don’t design using static earthquake load combinations (including me).

Thought it could be a fun fact. Keep up the good work! Like Liked by 1 person. Reply. Engr Dennis Mercado says: July 3, at am.