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- 저자 : H. Karimipour (검색결과 2 건)
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A mathematical model for smart functionally graded beam integrated with shape memory alloy actuators
H. Sepiani,F. Ebrahimi,H. Karimipour 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.12
This paper presents a theoretical study of the thermally driven behavior of a shape memory alloy (SMA)/FGM actuator under arbitrary loading and boundary conditions by developing an integrated mathematical model. The model studied is established on the geometric parameters of the three-dimensional laminated composite box beam as an actuator that consists of a functionally graded core integrated with SMA actuator layers with a uniform rectangular cross section. The constitutive equation and linear phase transformation kinetics relations of SMA layers based on Tanaka and Nagaki model are coupled with the governing equation of the actuator to predict the stress history and to model the thermo-mechanical behavior of the smart shape memory alloy/FGM beam. Based on the classical laminated beam theory, the explicit solution to the structural response of the structure, including axial and lateral deflections of the structure, is investigated. As an example, a cantilever box beam subjected to a transverse concentrated load is solved numerically. It is found that the changes in the actuator's responses during the phase transformation due to the strain recovery are significant.
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M. Molaei,H. Hasheminejad,M. Karimipour 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
In this work, photoluminescence (PL) properties of CdTe and CdTe@CdS core-shellquantum dots (QDs) were investigated. CdTe and CdTe@CdS QDs were synthesizedusing a microwave activated method. CdS shell grown using a microwave activatedmethod which was based on the heat sensitivity of Na2S2O3. X-ray diffraction (XRD)analysis demonstrated cubic crystalline structure for both of the synthesized QDs, butfor CdTe@CdS QDs, XRD diffraction peaks shifted to the longer angle. Sizes of CdTeand CdTe@CdS QDs were obtained as about 2.5 and 3.5 nm from transmission electronmicroscopy (TEM) images. UV-Vis and PL spectra showed that in this method both ofthe absorption and emission of CdTe QDs shifted from near blue to near red. By thegrowth of CdS shell around CdTe QDs, a red shift was observed in absorption and PLspectra. PL QY was obtained as about 23% and 38% for CdTe and CdTe@CdS core-shellQDs, respectively. Increase in the thickness of the CdS shell was possible only by the increase in the microwave irradiation timein the CdS shell growth step. Growth of the CdS shell around CdTe core, resulted in the red shift in band edge and PL spectra tothe longer wavelengths.
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