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2019
In general, the load spectrum is too large and extensive to test the lifetime of a component. To hasten the testing time and to reduce costs, the load spectrum should be accelerated so that its much shorter testing time is equivalent to the real lifetime for the load spectrum. The equivalent load spectrum is called the accelerated load spectrum.
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In general, the load spectrum is too large and extensive to test the lifetime of a component. To hasten the testing time and to reduce costs, the load spectrum should be accelerated so that its much shorter testing time is equivalent to the real lifetime for the load spectrum. The equivalent load spectrum is called the accelerated load spectrum.
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Effects on Lifetime under Spectrum Loading*
Materials Testing, 2010Abstract Most components and structures are submitted to load-time histories with variable amplitudes during their service life. Their safe design, in the context of weight reduction requirements, demands detailed and deep knowledge about the effects of spectrum shape, blocked or random sequences, material response, cumulative damage ...
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Fatigue Crack Growth Under Spectrum Loads
1976Description The Symposium on Fatigue Crack Growth Under Spectrum Loads was held on 23-24 June 1975 at the Seventy-eighth Annual Meeting of the American Society for Testing and Materials in Montreal, Quebec, Canada. Committee E24 on Fracture Testing of Metals and Committee E09 on Fatigue sponsored the symposium. R. P.
RP Wei, RI Stephens
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Fatigue testing using offshore load spectrum
1987The results of an Internordic co-operative project are described. A standard spectrum for fatigue testing is proposed. It simulates the long term wave action history to inertia dominated structures in the North-Sea. Facilities for crack growth testing using the proposed spectrum have been developed and used in comparative tests.
Bronsted, Povl, Slind, Tor, Solin, Jussi
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Fatigue crack growth measurements under spectrum loading
Engineering Fracture Mechanics, 2000Abstract Fatigue crack growth rates under variable amplitude stress cycles were measured on two center-cracked tension specimens made of SM520B steel. Four loading spectra, right-skewed and left-skewed β distributions with the minimum or maximum stress constant, were applied to the specimens.
Kentaro Yamada +2 more
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Equivalent wind loading spectrum technique
1996Wind forces on structures are usually schematized by the sum of their mean static part and a nil mean fluctuation generally treated as a stationary process randomly varying in space and time. The multi-dimensional nature of such a process gives rise to relevant numerical efforts in order to carry out the dynamic analysis of the structural response ...
PICCARDO, GIUSEPPE, SOLARI, GIOVANNI
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Load-aware spectrum distribution in Wireless LANs
2008 IEEE International Conference on Network Protocols, 2008Traditionally, the channelization structure in IEEE 802.11-based wireless LANs has been fixed: Each access point (AP) is assigned one channel and all channels are equally wide. In contrast, it has recently been shown that even on commodity hardware, the channel-width can be adapted dynamically purely in software.
Thomas Moscibroda +5 more
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The Modal Spectrum of Ferrite-Loaded Striplines
MTT-S International Microwave Symposium Digest, 2005This paper presents the latest results of a theoretical investigation into the full modal spectrum of those ferrite-loaded planar waveguiding structures which represent the device geometries employed in broad-band stripline isolators and circulators.
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Load spectrum editing for automotive fasteners based on bolt critical load
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile EngineeringThe durability of threaded fasteners is critical to chassis reliability. Conventional load spectrum editing often retains low-amplitude, high-cycle loads that extend test time without affecting preload. This study introduces an accelerated editing method that integrates the bolt critical load threshold with the S-transform to account for the loosening ...
Zhenyi Cheng +3 more
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Fatigue of composite materials under spectrum loading
Composites Part A: Applied Science and Manufacturing, 2010Abstract A method to predict fatigue of composites under spectrum loading is proposed. It is based on a recently developed approach for constant amplitude loading where the cycles to failure are determined using the cycle-by-cycle probability of failure under a given loading. Failure under spectrum loading occurs when the residual strength equals the
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