Shigeyuki Haruyama

Contact Stress and Contact Width Analysis of Corrugated Metal Gasket

Previous studies on corrugated metal gaskets have established that the contact width, contact stress, and surface roughness are important design parameters for optimizing gasket performance. However, the contact stress and contact width considering the surface roughness when the leakage occur did not defined yet. In this study, we determined the real contact stress and contact width when leakage started on 25A-size metal gasket. The contact width determined through a comparison between simulation and experimental results. The contact stress determined through a simulation analysis. The experiment involves a helium leakage test using new metal gaskets having different surface roughness levels. The result justified that the real contact width and average contact stress when the leakage started occur were 0.195mm and 800MPa, respectively. There is a good agreement for contact width both by simulation and experiment result. The contact width for flange having surface roughness 1.5μm is longest than the others.

Contact Width Analysis of Corrugated Metal Gasket Based on Surface Roughness

Contact width is important design parameter for optimizing design of new metal gasket. The contact width was found have relationship with helium leak quantity. Increasing axial force, the contact width will increase and helium leakage will decrease. This study we conducted the surface roughness evaluation of 25A-size metal gasket before and after use. The results denote the real contact width after contact with flange having different surface roughness. The real contact width for the flange having smoother surface roughness is wider than the rougher one.

Studies of Relationship between Contact Width and Leakage on Large Size of New Metal Gasket

In the previous study, the relationship between leakage and the contact width size that prevent leakage for 25A size of new metal gasket has been examined. In this study, large size of new metal gasket which are 50A, 80A and 100 A sizes were evaluated by using same approach of leak measurement and the relationship between leakage and the contact width. A new approach of leak measurement was performed to clarify the relationship between the presence of leak produced by the water pressure test and the amount of helium leak rate using helium leak test. Moreover, comparing the evaluation results of the relationship between the clamping load and the contact width by using the finite element method (FEM) analysis with the experimental results of the clamping load and the leakage, the contact width which affects the occurrence of leakages on new metal gasket was clarified. The results obtained for these gaskets indicated that the contact width is similar.

Optimized design of cab frame to improve energy absorption performance

Heavy operating vehicle was used in many surfaces condition, sometimes in heavy terrain with high possibilities of rollover accident. Rollover is a fatal condition where the equipment shifted from its stability and move toward the ground. Consequently, the use of a rollover protecting structure or cab frame as a standard safety was an effort to protect operator from the accident. Numerical approach using finite element method generated a simple square of cab frame combined with design experiment of Taguchi’s orthogonal array. A set of 11 single bars compiled into entire cab frame where each bar has 2 thickness levels and total 12 simulations were required. Furthermore, every simulation compares each other to produce the highest energy absorption during collision. Finally, the highest result then optimized using Taguchi’s control chart. Thickness is known as a prime factor in structural design which can increase energy absorption and reduce buckling at certain area. The highest energy absorption obtained in the optimized model was valuable for prototyping development of cab frame.Heavy operating vehicle was used in many surfaces condition, sometimes in heavy terrain with high possibilities of rollover accident. Rollover is a fatal condition where the equipment shifted from its stability and move toward the ground. Consequently, the use of a rollover protecting structure or cab frame as a standard safety was an effort to protect operator from the accident. Numerical approach using finite element method generated a simple square of cab frame combined with design experiment of Taguchi’s orthogonal array. A set of 11 single bars compiled into entire cab frame where each bar has 2 thickness levels and total 12 simulations were required. Furthermore, every simulation compares each other to produce the highest energy absorption during collision. Finally, the highest result then optimized using Taguchi’s control chart. Thickness is known as a prime factor in structural design which can increase energy absorption and reduce buckling at certain area. The highest energy absorption obtained i...

Study on Bending Characteristics for Square Tube Using Energy Absorption Part

Abstract—In the square tube subjected to the bending load, the rigidity of the entire square tube is reduced when a collapse occurs due to local stress concentration. Therefore, in this research, the influence of bending load on the square tube with attached energy absorbing part was examined and reported. The analysis was conducted by using Finite Element Method (FEM) to produced bending deflection and buckling points. Energy absorption was compared from rigidity of attached part and square tube body. Buckling point was influenced by the rigidity of attached part and the thickness rate of square tube.

Optimization Spring Coil Design for Orthodontic Tooth Movement

Orthodontic tooth movement is achieved by the remodeling of alveolar bone in response to mechanical loading by using spring coil. Spring coil design was made of round stainless steel wire and usually it was custom-made design. In the previous study, the orthodontic force on 30 gram is required to move maxillary incisor during experimental tooth movement in rat. In this study, optimization new design of spring coil is developed to fulfill the requirement of orthodontic force. The design variable of new spring coil design is set on variation of angle aperture (5o α 10o), hook length (10 mm l 20 mm) and hook diameter (0.012 inch D 0.014 inch). From the result, it can be produced the optimum designs which 8.9o of angle aperture; 12 mm of hook length and 0.014 inch of hook diameter for fulfilling the requirement of orthodontic force on 30 gram force.

Evaluation Grain Homogeneity of Aluminium after ECAP Process by ECAP Geometry Analysis Using Taguchi Method

Grain size and homogeneity are influence to aluminium properties, Equal channel angular pressing (ECAP) can produce aluminium with ultra fine grain Size (UFG). The grain size is depends on ECAP Dies geometry (Channel angle Φ, Fillet radius ψ) and friction, taguchi method used to find the optimum dies geometry its can produce smaller grain size and homogeny. Modeling done with channel angels 90, 105 and 120°, fillet radius (inside) 1.5, 5,0 and 10 mm ; fillet radius (outside) 1.5, 5,0 and 10 mm and friction 0, 0,025 and 0,05. Modeling used L9 taguchi matrix, the most homogeny dies is ECAP dies with channel angel 105°, fillet radius (inside) 10 mm ; fillet radius (outside) 0 mm and friction 0,025

Optimization of New Metal Gasket Design Based on Contact Width Involving Contact Stress Consideration

The relationship of contact width and leakage had been found as design concept to optimize new metal gasket. By using this design concept, the limits of contact width for no leakage can be chosen. The optimize gasket shape can be developed by increasing of contact width. In this study, a gasket shape was optimized based on contact width as design concept and involving contact stress consideration. The design of experimentation (DOE) Taguchi method is used to analyses the effect of each parameter design and predict optimal design of new 25A metal gasket. The L18 orthogonal array was concerned to design experimental matrix for seven factors with three levels. The optimum design of gasket at 0 MPa mode is the model with OH = 4 mm, p1 = 3.5 mm, p2 = 4 mm, p3 = 4 mm, t = 1.2 mm, R = 3.5 mm and h = 0.4 mm. The optimum design of gasket at 400 MPa mode is the model with OH = 3 mm, p1 = 3.5 mm, p2 = 4.5 mm, p3 = 4.5 mm, t = 1.8 mm, R = 1.5 mm and h = 0.3 mm.