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Energy release rates for various defects under different loading conditions
Y. Eugene Pak,다네시와미시라,유승현 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.11
It is well known that the energy release rate associated with translation, rotation and self-similar expansion of defects in solids are expressed by the path-independent integrals J, L, and M, respectively. It is shown that these integrals for a crack or a circular hole may be obtained by first considering an elliptical cavity and then performing a limiting process. This obviates dealing with singularities at the crack tip. The energy release rates for these defects under various mechanical, thermal and electromechanical loading conditions are calculated.
박승환,최용희,Mun-Bo Shim,김성진,Chang Young Park,Y. Eugene Pak,다네시와미시라,유승현,강건욱 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.4
The effects of crystal orientation on the optical gain characteristics of blue AlInGaN/InGaNquantum-well (QW) structures with a reduced internal field were investigated by using the non-Markovian model with many-body effects. The AlInGaN/InGaN system has a larger matrix elementthan the conventional InGaN/GaN system because the former has a smaller internal field than thelatter for relatively small crystal angles. As a result, for QW structures with a relatively smallcrystal angle ( = 30), the AlInGaN/InGaN system is shown to have a much larger optical gainthan the conventional InGaN/GaN system. On the other hand, in the case of QW structures witha large crystal angle ( = 90), the AlInGaN/InGaN system is shown to have a smaller optical gainthan the conventional InGaN/GaN system. Hence, we expect that we can obtain high-efficiencyoptoelectronic devices by using quaternary AlInGaN QW for relatively small crystal angles.