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排序方式: 共有67条查询结果,搜索用时 15 毫秒
1.
Liang Wang Jung-Hoon Park Nak-Sam Choi 《Journal of Mechanical Science and Technology》2020,34(3):1049-1058
The fracture of ductile materials such as Al6061-T6 usually starts from void nucleation. In this study, we investigated strengthening effect and stress triaxiality behavior in notched Al alloy specimens. Various specimens, one un-notched and two with different U-types of notch, one with large diameter (L-notched) and another with small diameter (S-notched), having the same width were selected. The distribution of strain in the full-field was examined using the digital image correlation (DIC) method. Under the tensile test, S-notched specimens showed a more pronounced strengthening effect than the L-notched specimens. The results of DIC confirmed that the notch tip of the S-notched specimen experienced high strain, while the L-notched specimen experienced high strain at the center. The maximum stress triaxiality moved rapidly from the notch tip to the center with the increase in notch radius over 10 mm. The results of the stress triaxiality analysis by finite element method were in good agreement with the above DIC measurement results and predicted the void generation and fracture sites in L-notched and S-notched specimens. 相似文献
2.
3.
Jung-Hoon Kim Shishir Kumar Behera Seok-Young Oh Hung-Suck Park 《Water and Environment Journal》2010,24(4):293-302
Effluent qualities of five municipal wastewater treatment facilities (MWWTFs) in Ulsan were evaluated to examine their reuse potential. Effluent from Yongyeon (Y) MWWTF, Onsan (O) MWWTF and Bangeojin (B) MWWTFs can be used as cooling water without further treatment. As evident from Langelier saturation index and Ryzner index values, reuse of treated effluent from OMWWTF and BMWWTFs is recommended by controlling the pH to reduce the scale-forming potential of effluent. However, effluents from these MWWTFs need additional treatment to remove residual dissolved constituents before reuse as boiler water. Besides, effluent from Hoiya (H) MWWTF and Unyang (U) MWWTFs can be reused for agricultural irrigation without any additional treatment. Based on the scientific results obtained from this investigation, proper application of technology and promotion of public awareness to change the traditional mindset for treated effluent reuse could immensely contribute towards conserving local water resources and addressing global environmental problems on a regional basis. 相似文献
4.
Sang-Jae Yoon Jung-Hoon Park Nak-Sam Choi 《Journal of Mechanical Science and Technology》2012,26(6):1747-1752
Shot-peening effects on the fatigue life behavior of bearing steel (JIS SUJ2) have been investigated. Hourglass-shaped test specimens were heat-treated and then surface-treated using a shot-peening machine. Results of a rotary bending fatigue test showed that shotpeening suppressed not only much of the surface-originated fracture but also the scattering error of the probabilistic stress-life data, and improved the fatigue life by about 6 times through the load levels of the cyclic tests. Such large increase in fatigue life was driven by the following reasons: The increase of hardness in the skin caused the predicted fatigue limit stress to increase by 15%; fracture-initiating inclusions were distributed at deeper locations, experiencing low nominal stresses; and the increase in the fish-eye fracture size by an average of 180%. 相似文献
5.
Joung-Man Park Jung-Hoon Jang Zuo-Jia Wang Dong-Jun Kwon K. Lawrence DeVries 《Composites Part A》2010,41(11):1702-1711
Electro-micromechanical techniques, wettability test, and acoustic emission (AE) were use to compare self-sensing and stress-transferring effects in single carbon fiber embedded in carbon nanofiber (CNF)–epoxy composites with two different aspect ratios. Electrical resistivity and standard deviation were used as indirect measures of comparative dispersion degree of CNF. The dispersion was observed to decrease with increasing CNF content due to an increase in the electrical contacts. Composites with higher aspect ratio exhibited better self-sensing than lower aspect ratio case. This was attributed to differences in dispersion, orientation, coagulation of CNF with different aspect ratios. The opposite effect was observed for apparent Young’s modulus, which was larger for composites with lower aspect ratio. This is probably related to better stress transfer linked to orientation effects. Work of adhesion consistently followed same trend as apparent Young’s modulus. Single carbon fiber pull-out tests and AE provided additional information on the effects of aspect ratio. 相似文献
6.
Jung-Hoon Yang Varun Penmatsa Shinya Tajima Hiroshi Kawarada Chunlei Wang 《Materials Letters》2009,63(30):2680-2683
Three-dimensional pyrolyzed carbon micropatterns were fabricated by using photolithography and pyrolysis process. Direct amination was achieved by functionalizing its surface with ultraviolet (UV) irradiation under ammonia gas. Quantified amino groups on the carbon surface were estimated by X-ray photoelectron spectroscopy. Hybridization intensity and intensity profile were investigated by epifluorescence microscopy. 相似文献
7.
Jung-Hoon Lee Jang-Soo Lee Gi-Ho Park Kil-Whan Lee Shin-Dug Kim 《Electronics letters》2000,36(8):705-706
A new translation lookaside buffer (TLB) structure is proposed which supports dual page sizes so as to obtain the effect of multiple page sizes with high performance and at low cost without operating system support. According to the results of a comparison and analysis, a similar performance can be achieved by using fewer TLB entries compared with conventional TLBs 相似文献
8.
Kyung Seok Yang Jung-Hoon Sohn Hyung Kwoun Kim 《Journal of Bioscience and Bioengineering》2009,107(6):599-604
Biodiesel, an alternative fuel, is generated via the transesterification reaction of vegetable oil or animal oil with alcohol. Currently, many reports have noted that microbial lipases might be utilized for the production of biodiesel. Among them, immobilized Candida antarctica lipase B (Novozym435) is frequently utilized for its biocatalytic efficiency and availability. However, as the enzyme is unstable in a medium containing high concentrations of methanol, a multi-stepwise methanol supply is required for the efficient production of biodiesel. Photobacterium lipolyticum lipase (M37) was determined to be quite stable in a medium containing a high concentration of methanol. The enzyme activity was maintained for longer than 48 h without any loss at a methanol concentration of 10%. In an effort to evaluate enzyme performance in the production of biodiesel, we have compared M37 lipase and Novozym435 in the biodiesel production reaction using fresh or waste oil and methanol. In the 3-stepwise methanol feeding method generally conducted for Novozym435 in biodiesel production, the M37 lipase showed a similar or superior conversion yield to Novozym435. However, the M37 lipase evidenced significantly higher conversion yields in the 2 and 1 step methanol feeding reactions. Particularly in the 1 step process using 10% of methanol where almost no conversion was detected by Novozym435, the biodiesel yield achieved with M37 lipase reached a level of up to 70% of the possible maximum yield. Consequently, this methanol-tolerant lipase, M37, has been shown to be a suitable enzyme for use in the biodiesel production process. 相似文献
9.
Sung-Sik Shin Jung-Hoon Lee Sug-Joon Yoon 《Journal of Mechanical Science and Technology》2006,20(3):376-381
In this paper, the quaternion, the dual Euler, and the direction cosine methods are numerically compared using a non-aerodynamic
6 degree-of-freedom rigid model at all-attitude angles of an aircraft. The dual Euler method turns out to be superior to the
others in the applications because it shows better numerical accuracy, stability, and robustness in integration step sizes.
The dual Euler method is affordably less efficient than the quaternion method in terms of computational cost. Numerical accuracy
and stability, which allow larger integration step sizes, are more critical in modern real-time applications than computational
efficiency because of today’s increased computational power. If the quaternion method is required because of constraints in
computation time, then a suppression mechanism should be provided for algebraic constraint errors which will eventually add
computational burden. 相似文献
10.
Jung-Hoon Lee Jong-Sun Ko Se-Kyo Chung Dae-Sik Lee Ju-Jang Lee Myung-Joong Youn 《Industrial Electronics, IEEE Transactions on》1994,41(5):483-491
The continuous, accurate, and robust sliding mode tracking controller based on a disturbance observer for a brushless direct drive servo motor (BLDDSM) is presented. Although the conventional sliding mode control (SMC) or variable structure control (VSC) can give the desired tracking performance, there exists an inevitable chattering problem in control which is undesirable for a direct drive system. With the proposed algorithm, not only are the chattering problems removed, but also the prescribed tracking performance can be obtained by using the efficient compensation of the disturbance observer. The design of the sliding mode tracking controller for the prescribed, accurate, and robust tracking performance without the chattering problem is given based on the results of the detailed stability analysis. The usefulness of the proposed algorithm is demonstrated through the computer simulations for a BLDDSM under load variations 相似文献