Journal ArticleDOI
Acoustic emission monitoring of fatigue crack growth
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TLDR
In this paper, the authors used the acoustic emission technique to monitor fatigue crack growth, and attributed the peak load emissions to both crack extension and deformation and fracture events occurring within the crack tip plastic zone, and these emissions have been correlated with the energy released during crack growth.About:
This article is published in Materials Science and Engineering.The article was published on 1978-01-01. It has received 240 citations till now. The article focuses on the topics: Crack closure & Paris' law.read more
Citations
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Polymer‐Fullerene Bulk‐Heterojunction Solar Cells
Christoph J. Brabec,Srinivas (Jimmy) Gowrisanker,Jonathan Halls,Darin W. Laird,Shijun Jia,Shawn P. Williams +5 more
TL;DR: An outlook is presented on what will be required to drive this young photovoltaic technology towards the next major milestone, a 10% power conversion efficiency, considered by many to represent the efficiency at which OPV can be adopted in wide-spread applications.
Journal ArticleDOI
Acoustic emission monitoring of fatigue crack propagation
T. M. Roberts,M. Talebzadeh +1 more
TL;DR: In this article, the monitoring of fatigue crack propagation in steel and welded steel compact tension and T-section girder test specimens, using an advanced acoustic emission system with accurate source location, is described.
Journal ArticleDOI
New Thiophene-Linked Conjugated Poly(azomethine)s: Theoretical Electronic Structure, Synthesis, and Properties
TL;DR: In this article, a joint theoretical and experimental study of several new thiophene-based poly(azomethine)s was performed and the optical and electrochemical band gaps of the polymer films were in the ranges 2.33−2.67 eV, which are smaller than that of the phenylene-based polymer.
Journal ArticleDOI
Donor–Acceptor–Donor-based π-Conjugated Oligomers for Nonlinear Optics and Near-IR Emission
Stefan Ellinger,Kenneth R. Graham,Pengjie Shi,Richard T. Farley,Timothy T. Steckler,Robert N. Brookins,Prasad Taranekar,Jianguo Mei,Lazaro A. Padilha,Trenton R. Ensley,Honghua Hu,Scott Webster,David J. Hagan,Eric W. Van Stryland,Kirk S. Schanze,John R. Reynolds +15 more
TL;DR: In this article, a family of multi-heterocycle donor-acceptor-donor (DAD) telechelic conjugated oligomers designed for two-photon absorption and emission in the near-infrared (near-IR) were prepared, and the relationship between their spectral, structural, and electrochemical properties were investigated.
Journal ArticleDOI
Synthesis and characterization of new fluorene-acceptor alternating and random copolymers for light-emitting applications
TL;DR: In this article, a series of light-emitting copolymers consisting of 9,9-dihexylfluorene (F) and different acceptor segments, including quinoxaline (Q), 2,1,3-benzothiadiazole (BT) and thieno[3,4-b]-pyrazine (TP), were synthesized by the palladium-catalyzed Suzuki coupling reaction.
References
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Journal ArticleDOI
Numerical Analysis of Crack Propagation in Cyclic-Loaded Structures
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Linear fracture mechanics, fracture transition, and fracture control
TL;DR: In this article, the leading edge of a crack is treated as a line disturbance zone in a manner similar to the treatment of dislocation lines in dislocation mechanics, and the authors discuss interpretation of the brittle-ductile transition in terms of relative plastic zone size, and allowable load estimates which include fracture strength in a rational way.
Journal ArticleDOI
Fracture analysis by use of acoustic emission.
TL;DR: In this paper, the authors present results of acoustic emission studies on flawed and unflawed specimens of aluminum and beryllium and show that acoustic emission from the flawed specimens is found to begin at stress levels far below the general yield stress.
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The influence of stress intensity and microstructure on fatigue crack propagation in ferritic materials
C.E. Richards,Trevor C. Lindley +1 more
TL;DR: In this paper, the authors investigated the influence of mean stress, specimen thickness, flow stress, and fracture toughness on the growth rate of fatigue crack propagation through their effect on growth mechanism and showed that simple relationships between the rate of propagation and alternating stress intensity are adequate for describing fatigue crack growth.