Results 171 to 180 of about 1,119 (212)
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Uniaxial ratchetting behavior of vulcanized natural rubber
Polymer Engineering & Science, 2007AbstractMost of rubber engineering components endure cyclic loading during their service, and a nonzero mean stress during cyclic loading may cause an accumulation of strain which is known as ratchetting phenomenon. In order to study the ratcheting effect of rubber, a series of uniaxial ratchetting experiments were conducted on vulcanized natural ...
Weiwei Yu +4 more
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Thermal Ratcheting Criteria and Behavior of Piping Elbows
Journal of Pressure Vessel Technology, 1990A thermal ratcheting test was performed using an elbow model test specimen subjected to sustained primary load and cyclic thermal transient strains. Under severe loading conditions incremental longitudinal strains are observed in the region where a circumferential angle is around ± π/9 from the side of the elbow, while the elbow cross section was ...
M. Ueda, T. Kano, A. Yoshitoshi
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Ratchet-induced anisotropic behavior of superparamagnetic microdroplet
Applied Physics Letters, 2009Microscale ratchet structured surfaces were coated with nanoparticles, which resulted in anisotropic behavior of superparamagnetic microdroplet by magnetic field actuation. This ratchet structure enables superparamagnetic microdroplets to generate the anisotropic behavior through the alternative external magnetic field.
Jihua Zhang +3 more
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Ratcheting Behavior of Sintered Copper Joints for Electronic Packaging
IEEE Transactions on Components, Packaging and Manufacturing Technology, 2021This study experimentally investigated the whole-life ratcheting behavior of sintered copper joints with consideration of the effects of stress rate, stress amplitude, mean stress, maximum stress, and stress ratio. Deformation of joints under cyclic load was measured by a noncontact displacement detecting system.
Yanliang Shan +6 more
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Uniaxial ratcheting and failure behaviors of two steels
Theoretical and Applied Fracture Mechanics, 2005The strain cyclic characteristics, ratcheting and failure behaviors of 25CDV4.11 steel and SS304 stainless steel were experimentally studied under uniaxial cyclic tests and at room temperature. The cyclic hardening/softening features of the materials were first observed under uniaxial strain cycling; and then the ratcheting and failure behaviors of the
G.Z. Kang +4 more
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Effect of particle mass on the behavior of stochastic ratchets
Technical Physics Letters, 1998Nonlinear Brownian motion in stochastic rachets is investigated by electronic simulation methods. It is shown experimentally that it is possible to sort particles by mass using a discrete random process, binary noise, as the source of the nonequilibrium stochastic ratchets.
A. P. Nikitin, D. É. Postnov
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Ratcheting of cyclically hardening and softening materials: I. Uniaxial behavior
International Journal of Plasticity, 1994Abstract Part II of this study is concerned with ratcheting phenomena of cyclically hardening and softening materials under biaxial, cyclic loading. Two sets of biaxial experiments were performed on carbon steel 1018 and stainless steel 304 thin-walled tubes. In the first tyoe of experiment, a constant internal pressure was prescribed while the tubes
Tasnim Hassan, Stelios Kyriakides
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Transactions of the Indian Institute of Metals, 2014
The objective of this work is the study of ratcheting fatigue behavior and post fatigue tensile properties of the commercial aluminum via heat treatment like annealing and normalizing. In view of this, stress controlled fatigue tests carried out at room temperature up to 150 cycles under different combinations of mean stress and stress amplitude using ...
R. Kreethi, Preeti Verma, Krishna Dutta
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The objective of this work is the study of ratcheting fatigue behavior and post fatigue tensile properties of the commercial aluminum via heat treatment like annealing and normalizing. In view of this, stress controlled fatigue tests carried out at room temperature up to 150 cycles under different combinations of mean stress and stress amplitude using ...
R. Kreethi, Preeti Verma, Krishna Dutta
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Ratchet-type micro-hydraulic actuator to mimic muscle behavior
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013Piezo actuators are usually found in applications where high precision, high stiffness, but small displacement are required. This makes them the actuation principle of choice for many microand nano-positioning applications. In contrast, animal and human muscles have a comparatively small stiffness, but long displacements.
Andreas Gödecke +2 more
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Molecular dynamics simulation on creep-ratcheting behavior of columnar nanocrystalline aluminum
Journal of Molecular Graphics and Modelling, 2023Creep-ratcheting deformation behavior of columnar nanocrystalline (NC) Al varying in grain sizes have been studied using molecular dynamics simulations at three different temperatures (300 K, 467 K, and 653 K). The underlying deformation mechanisms of columnar NC Al for two stress ratios of ratcheting are also evaluated in this study.
Pokula Narendra Babu, Snehanshu Pal
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