http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Effects of Material Modulus on Fracture Toughness of Human Enamel, a Natural Biocomposite
Dhaneshwar Mishra,Seung-Hyun Yoo 한국비파괴검사학회 2011 한국비파괴검사학회지 Vol.31 No.3
The enamel, the upper layer of a tooth has remarkable capability of bearing severe loading on the tooth. The fracture behavior is important to understand the mechanism of load bearing and it could be very useful for developing new materials. Non-destructive evaluation of such materials will also benefit from this knowledge. The graded microstructures of enamel were modeled by finite element analysis software and the J-integrals and the stress intensity factors were evaluated as the fracture parameters. The results show that these parameters are location dependent. Those values increase when measured in the direction of dentine enamel junction. This finding matched well with experiments and implies many useful understanding of biomaterials and applications to new materials.
Dhaneshwar Mishra,Y. Eugene Pak(박유근),Seung-Hyun Yoo(유승현) (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
Materials used for various applications are inherently inhomogeneous though we consider it homogeneous and isotropic for simplicity of analysis. Composite materials which are very common now a days for various applications in both large and small structures are designed in such a way that it has different layers and these layers have different material properties gives rise to the material inhomogeneity at the interfaces of these layers. Material inhomogeneity can cause stress concentration. Energy can be released or absorbed depending upon the elastic modulus mismatch between interfacing layers. The stress concentration along with energy release rate (GC) when reaches at its critical value can contribute to material failure. We have presented analytical solution for M-integral, the measure of energy release rate for self similar expansion in fiber, coating and matrix and studied the effect of material inhomogeneity by choosing different shear modulus ratio of fiber - matrix and coating ? matrix. The effect of coating thickness on energy release rate is also studied. It has been found that combination of stiffer fiber and softer coating in comparison to matrix absorbs energy while when fiber becomes softer and coating becomes stiffer with respect to matrix, it releases energy. Thickness of coating also have significant effect on energy release or absorb rate as in case of thicker coating, the energy release/absorb rate is smaller in both coating and matrix region while it increases significantly when we choose thinner coating. This study will be very helpful for understanding the energy release/absorb due to material inhomogeneity and coating thickness and thus help to understand the critical region of failures in such structures which can contribute for design improvements for composite structures with inclusions.
Effects of Material Modulus on Fracture Toughness of Human Enamel, a Natural Biocomposite
Mishra, Dhaneshwar,Yoo, Seung-Hyun The Korean Society for Nondestructive Testing 2011 한국비파괴검사학회지 Vol.31 No.3
The enamel, the upper layer of a tooth has remarkable capability of bearing severe loading on the tooth. The fracture behavior is important to understand the mechanism of load bearing and it could be very useful for developing new materials. Non-destructive evaluation of such materials will also benefit from this knowledge. The graded microstructures of enamel were modeled by finite element analysis software and the J-integrals and the stress intensity factors were evaluated as the fracture parameters. The results show that these parameters are location dependent. Those values increase when measured in the direction of dentine enamel junction. This finding matched well with experiments and implies many useful understanding of biomaterials and applications to new materials.
정웅락(Ung-Rak Jeong),유승현(Seung-Hyun Yoo),박창용(Chang-Young Park),김슬찬(Seul-Chan Kim),Dhaneshwar Mishra (사)한국CDE학회 2011 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2011 No.1
제지 제작공정에 있어서 초지공정(Sheet forming)의 wire 공정의 1 차 탈수 방법으로 사용되는 진공흡입식 탈수방식의 장치 구성은 진공펌프(vacuum pump), 기수분리기(fluid-air separator), 컨베이어 등으로 이루어져 있다. 본 논문에서는 wire 공정의 기수분리기 시스템에 트리즈를 활용하여 단가를 낮추는 설계 방안을 도출하는 과정을 기술하고자 한다. 대부분 기술자들은 문제가 없다고 생각하는 공정이나 장치에 대한 개선에 대한 반감을 가지고 이것은 심리적 장벽으로 작용하게 된다. 이러한 심리적 장벽을 돌파하기 위해 본 논문에서는 트리밍 기법으로 문제를 강제적으로 발생시켰고, 이 문제에서 기술모순을 도출하고 더 나아가 물리모순을 도출을 이끌어 내어 분리원리를 적용하였고 최종적으로 단가를 저감시키는 해결안을 쉽게 얻을 수 있었다.
TRIZ를 이용한 교반식 화학반응기의 베어링의 수명 문제 해결
정웅락(Ung-Rak Jeong),유승현(Seung-Hyun Yoo),이희성(Hee-Sung Lee),박창용(Chang-Young Park),다네사와 미시라(Dhaneshwar Mishra),김슬찬(Seul-Chan Kim) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
Shaft supported bearing of agitated type chemical reactor have several problems. First one is material degradation of the product. It is caused by the bearings in direct contact with the main structure. Second problem is that the lifespan of the bearing has been shortened because the product is located between the bearing and the shaft. Function analysis, trimming and separation principle of TRIZ are used for problem solving. This paper describes the problem situation and the obtained solution by TRIZ.