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박명균(Myung Kyun Park),박세만(Sae-Mahn Bahk) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
To join structures together, various methods and processes are available including welding, riveting, bonding with industrial adhesives and fastening by bolts. Analyses of the common areas formed by joining between the structures are significant in that their results can provide critical information for understanding the dynamic behavior of the whole structure. The structural factors affecting the dynamic behavior of the joined structures are usually believed to be materials composing the bolts, bolt sizes and the number of bolts as well as the strength of applied torque and the extent of overlap between the structures joined together. This paper analyzes the impacts of the structural factors such as the bolt sizes, the extent of overlap and the materials composing the structures on the dynamic behavior of the joined structures.
계장화 샤르피충격시험기를 이용한 고무보강 폴리머재료의 파괴인자 결정에 관한연구
박명균,최영식,박세만,양진승,Park, Myeong-Gyun,Choe, Yeong-Sik,Park, Se-Man,Yang, Jin-Seung 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.8
The Charpy and Izod impact tests are the most prevalent techniques used to characterize the effects of high impulse loads on ploymeric materials. An analysis method for rubber toughened PVC is suggested to evaluate critical dynamic strain energy release rates(G$\_$c/) from the Charpy impact energy measurements. An instrumented Charpy impact tester was used to extract ancillary information concerning fracture parameters in addition to total fracture energies and maximum critical loads. The dynamic stress intensity factor Kid was computed for varying amounts of rubber contents from the obtained maximum critical loads and also toughening effects were investigated as well.
박명균(Myung Kyun Park),박세만(SaeMahn Bahk) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There are various methods to join mechanical structures together. They typically include welding, mechanical joints by bolts and other processes depending on specific needs. Analyses of joints in the mechanical structures are essential in understanding the dynamic characteristics of the structures. In this research an impulse technique<br/> is applies to investigate the dynamic behavior of joints produced by bolts. The length of overlap in the joints was varied as the number of the bolts in the joints was changed. Also, the torque applied to the bolts were adjusted. Resonance frequencies were determined for the joints to evaluate the relationship between the increase in the applied torque and the increase in the number of bolts used in the joints. The results have demonstrated that the resonance frequencies of the joints increase with the increasing torque.