2,843 research outputs found
On static and fatigue strength determination of carbon fibre/epoxy composites Part 1: experiments
No full textThis work seeks to investigate the static and fatigue properties and the failure mechanisms of T300/QY8911 carbon-fibre-reinforced composite laminates with different layups to optimize the stacking sequence effect. Three different layups have been studied, namely, [45/0(2)/–45/90(2)/–45/0/45/90]s, [45/–45/0/–45/0/45/90/45/0/–45]s and [45/0/–45/0/45/0/45/0/90/0]s. The results for static strength and fatigue residual strength under different fatigue stress amplitudes are evaluated and compared with each other. The damage and failure mechanisms of the composite laminates are discussed. It is observed that all tension–tension fatigue damage patterns of the notched laminates are similar while the tension–tension fatigue properties vary with the laminate layup. The reduction of stress concentration caused by the tension–tension fatigue damage leads to an improvement of the residual strength of the notched specimens in contrast to their static strength properties. The damage mechanics of the notched laminates under compression–compression loading are more complex than those of the tension–tension fatigue specimens; their damage patterns are influenced by the test clamping fixture, the layup, the size of specimens and the diameter of the hole. The residual strengths are lower than those of the specimens without fatigue damage. It is verified that in a high-temperature and moisture environment, there is a decrease in static compression strength. The results of this study provide an insight into fatigue damage development in composites and constitute a fundamental basis for the development of a strain-based residual strength model
The Yarn of the Howling Gale by W.B. Cameron
No full textPamphlet - A satirical poem written by W.B. Cameron about the Social Credit Party during the 1930s in Alberta (6 pages
Ulnar collateral ligament injuries of the thumb- An overview of the injury and treatment
No full textOn static and fatigue strength determination of carbon fibre/epoxy composites Part 2: theoretical formulation
No full textThis paper outlines a practical model to evaluate fatigue residual strength for reliability-based design. A new formulation is presented for a fatigue-driven residual strength surface based on controlling fatigue strain. The parameter determination formulae of the residual strength surface are established to deal with the test data effectively and easily. Finally, the model is applied to experimental data, demonstrating the practical and effective use of the proposed model. It is shown that fatigue-driven residual strength can be obtained realistically according to the small sample test data using the new formulae
"...a small fish in a small pond..." The Reverend W.B. Clarke (1798-1878): 200 Years On
No full textThe Reverend W.B. Clarke remains something of an enigma in the annals of Australian science, despite the publication of numerous books and articles on his life and times. The author argues that this is mainly due to the deficiencies of previous researchers in addressing the full gamut of that Reverend gentleman’s work. Though the basic details of Clarke’s life are clearly known, numerous significant gaps exist in the surviving archive. For example, his personal collection of rocks, fossils, geological maps and library was destroyed in the Garden Palace fire of 1882; his large corpus of work which appeared in Australian newspapers between 1839-78 has only recently been identified; and a collection of personal correspondence awaits ‘translation’ and publication. Until these omissions are addressed, the jury must remain out as to whether W.B. Clarke deserves the title ‘Father of Australian Geology’ or any similar accolade
Institutions and Elegies: viewing the dead in W.B. Yeats and John Wieners
No full textIn this chapter we ask how poetic elegy encodes the modern institutional spaces of dying. But rather than visiting the hospital ward, we consider this at one remove, from the perspective of another modern institution where the aesthetic, natural-scientific as well as political dimensions of the relation between the living and the dead are made apparent: namely, the museum gallery. In addition to pointing out the structural similarity between the public spaces of the hospital ward and the art museum, and acknowledging their historical status as imperial institutions, we make a claim for their importance to a modern elegiac consciousness. More specifically, we turn to the examples of W.B. Yeats and John Wieners as two poets for whom the gallery affords the most vital occasion for encountering the dead. This is a study of poetic influence, yet it is also a study that allows us to move from questions of personal style to impersonal and institutionally framed modes of transmission
Confirming subsurface initiation at non-metallic inclusions as one mechanism for white etching crack (WEC) formation
No full textWhite etching crack (WEC) formation beneath the contact surface in steel rolling element bearings causes a premature wear failure mode called white structure flaking (WSF). The drivers and initiation mechanisms are contested. Extensive work previously conducted by the authors showed strong evidence for one mechanism of WEC initiation being subsurface at inclusions. This paper conducts further work for final verification. Rolling contact fatigue testing of bearings on a FAG-FE8 test rig was conducted. Serial sectioning was used to map WECs in their entirety that formed under non-hydrogen charged conditions for the first time. Evidence from this paper and previous works by the authors confirms that subsurface initiation of WECs at non-metallic inclusions is at least one mechanism of WEC formation.<br/
Synthesis of polyurethane elastomers hypercross-linked by partially hydrated polyhydroxylated C60
No full text
Letter From William Bell Scott to My Dear Sir
No full textabstract: Concerning Scott's declining of a book he was to borrow.Curator's Note: Handwritten note on letter reads:
W.B. Seth
Painter & Author
officer of the worldTranscription Details: {Herartto} 13 March
1852.
My dear Sir
I shall not need this copy of the Monograms of Man {I've} mention{ed}, having had 4 sent me by Hill.
Very truly Yours
William B. Scot
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