The aim of this paper is to investigate the effects of weld toe grinding and weld profiling on the fatigue strength of welded joints and the main influencing factors. Thus, experimental test results of welds improved by different grinding techniques are reviewed. In total, 445 small- and full-scale fatigue test results of various weld types and steel grades with yield strengths up to 1100 MPa are analysed. The obtained improvements of two FAT classes correspond well with current guidelines; however, a new S–N curve slope of m = 4 is recommended—in line with proposals for other weld geometry improvement techniques.
The dynamic recombination of an on-chain triplet exciton with an off-chain counterion trapped in an impurity molecule has been investigated using a molecular dynamics method. It has been found that luminous composite states including the trion and the singlet exciton are the main products in the triplet exciton-counterion reaction and their yields depend sensitively on the impurity potential and the coupling between the polymer chain and the impurity molecule. We demonstrate that the triplet exciton-counterion reaction can enhance the electroluminescence efficiency considerably, and that the triplet exciton plays an important role in the photoelectric process of polymer. Our results provide a new clue to understand the electroluminescence mechanism in the polymer light-emitting devices.
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