http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
치아파절시험과 유한요소해석에서의 치경 변형률에 관한 연구
유의식(Oui Sik Yoo),전경진(Keyoung Jin Chun) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.4
When occlusal force is applied to a tooth, stress concentration occurs on the dental cervical line. This study investigated to find the maximum force and strain of natural teeth using an Instron and strain gauges, comparing the strain of cervical enamel using finite element analysis(FEA). Tests were conducted with a mandibular first premolar applying the conditions of occlusion. Then, the FEA was processed with the same as conditions of the fracture test. The test showed that the maximum force, maximum compressive strain and maximum tensional strain was 278±26 N, 0.668×10<SUP>-3</SUP>±0.678×10<SUP>-3</SUP> and 0.248×10<SUP>-3</SUP>±0.102×10<SUP>-3</SUP>, respectively. It was found that six of eight measured strains were within the range of estimated strains by the FEA. Even though it was assumed that properties of FE models were isotropic, it could prove useful as a reference in understanding the tendency of dental strain.
경골 내 변형률 및 응력 분포 특성 분석을 통한 새로이 개발된 재치환용 인공슬관절의 생체역학적 안정성 평가: 유한요소해석
한바울,장영웅,유의식,김정성,김한성,임도형,Han, Paul,Jang, Young-Woong,Yoo, Oui Sik,Kim, Jung Sung,Kim, Han Sung,Lim, Dohyung 대한의용생체공학회 2013 의공학회지 Vol.34 No.1
In this study, biomechanical stability of the newly developed revision total knee arthroplasty (rTKA) was evaluated through strain and stress distribution analysis within the implanted proximal tibia using a three-dimensional finite element (FE) analysis. 2000N of compressive load (about 3 times body weight) was applied to the condyle surface on spacer, sharing by the medial (60%) and lateral (40%) condyles simulating a stance phase before toe-off. The results showed that PVMS within the revision total knee arthroplasty and the proximal tibia were less than yield strength considering safe factor 4.0 (rTKA: less than 10%, Cortical bone: less than 70%, Cancellous bone: less than 70%). The materials composed of them and the strain and stress distributions within the proximal tibia were generally well matched with those of a traditional revision total knee arthoplasty (Scorpio TS revision system, Stryker Corp., Michigan, USA) without the critical damage strain and stress, which may reduce the capacity for bone remodeling, leading to bone degeneration. This study may be useful to design parameter improvement of the revision total knee arthoplasty in biomechanical stability point of view beyond structural stability of revision total knee arthoplasty itself.
모사경골 홀의 유무에 따른 경골내 응력 분포 패턴 및 기저판과의 Micromotion 차이 분석
장영웅(YoungWoong Jang),이재영(Jae Yeong Lee),염정현(Jung Hyun Yum),유의식(Oui Sik Yoo),김정성(Jung Sung Kim),임도형(Dohyung Lim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The use of artificial bones in implant testing has become popular due to their low variability and ready availability. But the hole, which is created during the production process in located proximal tibia, is apprehended to change stress distribution pattern and make stress concentration. The purpose of this study was to analysis of stress distribution pattern & micromotion deviation between cancellous bone and baseplate according to hole using finite element analysis (FEA). von Mises Stress around the hole at medial, lateral on the cortical surface was measured 63.1%, 66.6% higher than the filled hole model, respectively. But Micromotion between tibia and baseplate was similarly measured in the safe region(0~45μm). These results indicate that mechanical test with artificial bone should be considered the effect of poximal tibia hole.