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Influence Of The Base Material On The Hydrogen Embrittlement Of A Nuclear Reactor Pressure Vessel

Published: 2014
Authors: J. Toribio, D. Vergara and M. Lorenzo

A hydrogen diffusion simulation through the wall of a nuclear reactor pressure vessel of the type WWER-440 is shown in this paper, using a numerical model of hydrogen diffusion assisted by stresses and strains. The nuclear reactor pressure vessel is composed by a bi-material of stainless steel, acting as a cladding material, and low carbon steel, acting as a base material.

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Improvement Of Fatigue Properties Of Cast Aluminum Alloy A356 By Warm Deformation

Published: 2014
Authors: M. J. Roy, D. M. Maijer, Y. Nadot

Aluminum foundry alloys such as A356 are used extensively in applications where high cycle fatigue (HCF) resilience is a key design consideration. Fully reversed, multiaxial HCF studies on this alloy in the T6 condition have shown that endurance limits are governed by maximum principal stress and driven by crack propagation as opposed to initiation.

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Role Of Dispersoids On The Fatigue Behavior Of Aluminum Alloys: A Review

Published: 2014
Authors: Raghavan Srinivasan, M. Ashraf Imam

Aluminum alloys contain dispersoids, namely thermodynamically stable second phase particles ranging in size from 0.1 to 1.0 um, which are used, for example, to control grain size. The presence of second phase particles could have a beneficial or detrimental effect on fatigue behavior depending on their properties and distribution with in the aluminum matrix. Hard non-shearable particles promote cross-slip and deformation homogenization that delays fatigue crack initiation, while shearable particles result in planar slip, which promote strain reversal and crack closure and slows crack propagation.

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A Study On Fatigue Crack Closure Behavior In Aluminum Alloy 7075 T6

Published: 2014
Authors: Kenichi Masuda, Sotomi Ishihara, Yuki Tochikawa, Arthur J. McEvily, Masaki Okane, Seiichi Nishino

In this study, fatigue tests were conducted on aluminum alloy 7075-T6 to study fatigue crack growth and crack closure behavior of the material. The experiments included the determination of the crack-opening levels Kop as a function of AK, the rate of fatigue crack growth da/dN as a function of AKeff, where AKef (= Kmax-Kop) is the effective stress intensity factor range.

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Fatigue Behavior Of Ultra-Fine Grained Ti-6Al-4V Alloy

Published: 2014
Authors: R. Ebara , M. Endo , H.J. Kim , J. Nakahigashi

This paper reviews fatigue strength, fatigue crack initiation and fatigue crack propagation behavior of protium treated ultra-fine grained Ti-6Al-4V alloy in air and in 3% NaCl aqueous solution. First the protium treatment procedure for Ti-6Al-4V alloy and characteristics of ultra- fine grained Ti-6Al-4V alloy such as microstructure and mechanical properties is briefly summarized.

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Quasi-Static, Fatigue And Fracture Behavior Of Aluminum Alloy Composite Used In Brake Drums

Published: 2014
Authors: K. Manigandan, T.S. Srivatsan, T. Quick

In this paper the results of a study aimed at investigating and understanding the quasi-static, cyclic fatigue properties and final fracture behavior of an aluminum alloy reinforced with particulates of ceramic, a viable candidate for use in brake drums of emerging automobiles, is highlighted. The processing treatment used to engineer the aluminum alloy composite is detailed.

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Effect Of Cobalt Content On Fatigue Lifetimes And Short Fatigue Crack Growth Behavior Of Tungsten-Cobalt Cemented Carbides

Published: 2014
Authors: Hiroko Mikado, Sotomi Ishihara, Noriyasu Oguma, Kenichi Masuda, Shingo Kawamura

Fatigue lifetimes and crack growth behavior of the cemented carbides with different Co content were investigated. Effect of the Co content on the fatigue lifetimes is found to be minimal within the Co content, 13 -18 wt% tested in the present study.

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Experimental And Numerical Studies On Multistage Strength Degradation In Notched Concrete Beams Under Repeated Loads: A Review

Published: 2014
Authors: Masaaki Nakano, Zihai Shi, Yukari Nakamura, Cuiping Liu, Hiroshi Tanaka

The multistage strength degradation theory states that fatigue is caused by the sporadic sudden change o f c racking behaviour in a system under cyclic loading, leading to intermittent strength reduction of the system and its eventual failure. To prove this theory, an experimental study on the load-carrying capacity of notched concrete beams was carried out first, in which the sizes of several notches were enlarged sequentially to simulate the growth of cracks under repeated loading

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Strain Energy Diagram For Characterising Fatigue Behaviour In Structural Members And Machine Parts Subjected To Repeated Loads

Published: 2014
Authors: Zihai Shi, Yukari Nakamura, Masaaki Nakano

According to the multistage strength degradation theory which has recently emerged from studies on the material and structural behaviour of concrete, fatigue is caused by the sporadic sudden change of cracking behaviour in a system under cyclic loading, leading to intermittent strength reduction of the system and its eventual failure. Here we report a new finding on the waveform variation of the maximum strain energy along the axis of load cycles in a structural member or machine part under fatigue.

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Cyclic Strain Resistance, Deformation And Fracture Behavior Of A Novel Alloy Steel

Published: 2014
Authors: K. Manigandan and T. S. Srivatsan V. K. Vasudevan, D. Tammana and B. Poorbangi

In this paper, the results of a study on microstructural influences on cyclic strain response, deformation and fracture behavior of an alloy steel is presented Cyclic strain resistance exhibited a linear trend for the variation of both elastic strain amplitude with reversals-to-failure, and plastic strain amplitude with reversals-to-failure.

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