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Authors: Ian V. Kidd, Elan J. Weiss, Laura S. Bruckman, Olivier Rosseler, Roger H. French
Optical and chemical properties are used to track degradation of hardcoat acrylic systems with PET and TPU substrates. Magnitude and variance of yellowness is correlated to UV irradiance, 0.92 and haze is correlated to moisture in UV irradiance, 0.84, in PET substrate candidates.
Authors: Lindsey Goodman and Eric Caldwell
As oil and gas extraction moves deeper and farther offshore, many technical challenges arise. Deeper wells are often produced with flowing wellhead temperatures in excess of 300°F (150°C), and equipment is subject to hydrostatic conditions nearing 5,000 psi (345 bar) hydrostatic pressure. Despite high temperatures of produced fluids, it is often necessary to insulate subsea production equipment and flow-lines to prevent blockages such as hydrates and waxes that can form during shutdowns.
Authors: Yunusa A. Balogun, Ryan Ubelhor
The likelihood of successful system operation following long periods of dormancy can be increased by assessing the long-term environmental effects on the performance of materials and subsystems. Because of the long experimental times often required in many accelerated aging programs, the need for faster and more reliable methods for investigating the degradative aging of polymeric materials under various environments becomes important.
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.
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.
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.
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.
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.
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.
Effect Of Cobalt Content On Fatigue Lifetimes And Short Fatigue Crack Growth Behavior Of Tungsten-Cobalt Cemented Carbides
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.