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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Mechanical Engineers A
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Journal DOI :
The Korean Society of Mechanical Engineers
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Volume & Issues
Volume 28, Issue 12 - Dec 2004
Volume 28, Issue 11 - Nov 2004
Volume 28, Issue 10 - Oct 2004
Volume 28, Issue 9 - Sep 2004
Volume 28, Issue 8 - Aug 2004
Volume 28, Issue 7 - Jul 2004
Volume 28, Issue 6 - Jun 2004
Volume 28, Issue 5 - May 2004
Volume 28, Issue 4 - Apr 2004
Volume 28, Issue 3 - Mar 2004
Volume 28, Issue 2 - Feb 2004
Volume 28, Issue 1 - Jan 2004
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3-D Vibration Modes of the Tire in Ground Contact and Its Effects on Wheel and Axle When Excited by a Vertical Impact at the Center of Contact Patch
Kim, Yong-Woo ; Nam, Jin-Young ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 325~332
DOI : 10.3795/KSME-A.2004.28.4.325
Tire vibration modes are known to play a key role in vehicle ride and comfort characteristics. Inputs to the tire such as impacts, rough road surface, tire nonuniformities, and tread patterns can potentially excite tire vibration. In this study, experimental modal analysis on the tire with ground contact are performed by impacting the tire in the radial direction at the center of contact patch. To investigate which modes of tire influence the vibration of wheel and axle when the tire is in contact with ground, the vibration characteristics such as frequency response functions, natural frequencies and their mode shapes from tire to wheel/axle are examined.
The Influence of Temperature on Low Cycle Fatigue Behavior of Prior Cold Worked 316L Stainless Steel (I) - Monotonic and Cyclic Behavior -
Hong, Seong-Gu ; Yoon, Sam-Son ; Lee, Soon-Bok ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 333~342
DOI : 10.3795/KSME-A.2004.28.4.333
Tensile and low cycle fatigue (LCF) tests on prior cold worked 316L stainless steel were carried out at various temperatures from room temperature to 650
. At all test temperatures, cold worked material showed the tendency of higher strength and lower ductility compared with those of solution treated material. The embrittlement of material occurred in the temperature region from 300
due to dynamic strain aging. Following initial cyclic hardening for a few cycles, cycling softening was observed to dominate until failure occurred during LCF deformation, and the cyclic softening behavior strongly depended on temperature and strain amplitude. Non-Masing behavior was observed at all test temperatures and hysteresis energy curve method was employed to describe the stress-strain hysteresis loops at half
life. The prediction shows a good agreement with the experimental results.
Design of δ
Clip Gage for CTOD Measurement
Park, Tai-Heoun ; Nahm, Seung-Hoon ; Kim, Am-Kee ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 343~351
DOI : 10.3795/KSME-A.2004.28.4.343
The flaw assessment method based on
parameter was recently proposed and put to the practical use. However: since it is almost impossible to measure the
by the existing commercial clip gager, we need to develope the specially designed gages which are suitable for that purpose. In this research, a double cantilever type
clip gage with the traveling distance of 4mm was developed by the finite element analysis and the construction of Wheatstone bridge circuit including strain gages. The linearity of developed
clip gage was evaluated by the MTS extensometer calibrator with the proper adapters which allow the 6s clip gage to sit on the calibrator. Consequently, the 6s clip gage revealed the good linearity between the output voltage and the traveling distance of gage.
Prediction of Failure Behavior for Nuclear Piping Using Curved Wide-Plate Test
Huh, Nam-Su ; Kim, Yun-Jae ; Choi, Jae-Boong ; Kim, Young-Jin ; Lim, Hyuk-Soon ; Chung, Dae-Yul ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 352~361
DOI : 10.3795/KSME-A.2004.28.4.352
One important element of the Leak-Before-Break analysis of nuclear piping is how to determine relevant fracture toughness (or the J-resistance curve) for nonlinear fracture mechanics analysis. The practice to use fracture toughness from a standard C(T) specimen is known to often give conservative estimates of toughness. To improve the accuracy, this paper proposes a new method to determine fracture toughness using a nonstandard testing specimen, curved wide-plate in tension. To show validity of the proposed curved wide-plate test, the J-resistance curve from the full-scale pipe test is compared with that from the curved wide-plate test and that from the C(T) specimen. It is shown that the J-resistance curve form the curved wide-plate tension test is similar to, but that from the C(T) specimen is lower than, the J-resistance curve from the full-scale pipe test. Further validation is performed by investigating crack-tip constraint conditions via detailed 3-D FE analyses, which shows that the crack-tip constraint condition in the curved wide-plate tension specimen is indeed similar to that in the full-scale pipe under bending.
Analysis on Optical Characteristics of LCD Backlight LGP
Sah, Jong-Youb ; Park, Jong-Ryul ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 362~369
DOI : 10.3795/KSME-A.2004.28.4.362
LGP(Light-Guide Panel) of LCD backlight is one of the major componets which affect on the product quality of LCD. The optical relation between brightness and pattern has been investigated for LGP with the uniform distribution of brightness. When given the brightness distribution as target, the solutions of pattern distribution is not unique. Each solution of pattern designs shows the different brightness intensity even though they have the same brightness distribution with target`s one. The manufacturing condition of pattern has an influence on the possibly-maximum-brightness intensity among the solutions of pattern design. The present study has examined the effects of LGP thickness, pattern shape errors, and reflection film on the optical characteristics of LGP.
A Study on the Topology Optimization in Magnetic Fields - Comparisons Between the Density Method and the Homogenization Design Method
Yoo, Jeong-Hoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 370~377
DOI : 10.3795/KSME-A.2004.28.4.370
The density approach and the homogenization design method are representative methods in topology optimization problems. In the topology optimization in magnetic fields, those methods are applied based on the results of the applications In elastic fields. In this study, the density method is modified considering the concept of the homogenization design method. Also, the results of the topology optimization in magnetic fields by the modified density method as well as the homogenization method are compared especially focusing the change of the penalization parameter in the density approach. The effect of the definition of the design domain such as global/local design domain is also discussed.
Optimum Design of a Viscous-driven Micropump with Tandem Rotating Cylinders
Choi, Hyung-Il ; Kim, Ki-Dong ; Cho, Il-Dae ; Choi, Dong-Hoon ; Maeng, Joo-Sung ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 378~385
DOI : 10.3795/KSME-A.2004.28.4.378
Viscous-driven pumping is a very promising type in microscale applications. However, there exist a few disadvantages such as low efficiency and small volume flow rate. In the present study, a pump with tandem rotating cylinders and its optimum synthesis are proposed fur enhancing pumping performance. First, using an unstructured grid CFD method, we investigate the effects of geometrical parameters and then the performance of the pump with tandem cylinders is evaluated. Next, an optimum design synthesis tool is constructed by combining the aforementioned CFD analysis model with the mathematical optimization model, namely, Modified Method of Feasible Directions (MMFD). This technique is used to optimize the geometrical parameters of the pump, fur maximizing pumping efficiency. From the optimization results, it is believed that the present optimum synthesis is robust and has a potential fur other microfluidic device design.
Measurement of Crack Length by Ultrasonic Attenuation Coefficient
Chung, Nam-Yong ; Park, Sung-Il ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 386~393
DOI : 10.3795/KSME-A.2004.28.4.386
In this paper, the ultrasonic attenuation coefficient was measured by variation of crack length for double-cantilever beam(DCB) specimen. The energy release rate, G, was obtained by the experimental measurement of compliance. The experimental results represents that the crack length for the ultrasonic attenuation coefficient and energy release rate is increases proportionally From the experimental results, we proposed a detecting method of the crack length by the ultrasonic attenuation coefficient and discussed it.
Study on the Thermo-Mechanical Behaviors of Fiber Metal Laminates Using the Classical Lamination Theory
Choi, Heung-Soap ; Roh, Hee-Seok ; Kang, Gil-Ho ; Ha, Min-Su ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 394~401
DOI : 10.3795/KSME-A.2004.28.4.394
In this study the mechanical behaviors of fiber metal laminates(FMLs) such as ARALL, GLARE and CARE which are recently developed as new structural materials and known to have excellent fatigue resistant characteristics while with relatively low densities compared to the conventional aluminum materials, are considered through the classical lamination theory. The mechanical properties such as elastic moduli, thermal expansion coefficients and hygro-thermally induced residual stresses in the fiber metal laminates are obtained and compared each other. Also, carpet plots of effective elastic moduli, Poisson`s ratio and the thermal expansion coefficient for GLARE FML are plotted.
Effect of Local Wall Thinning Defect on the Collapse Moment of Elbow
Kim, Jin-Weon ; Kim, Tae-Soon ; Park, Chi-Yong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 402~409
DOI : 10.3795/KSME-A.2004.28.4.402
The purpose of this study is to investigate the effect of local wall thinning on the collapse of elbow subjected to internal pressure and bending moment. Thus, the nonlinear three-dimensional finite element analyses were performed to obtain the collapse moment of elbow containing various wall thinning defects located at intrados and extrados under two loading modes (closing and opening modes) with internal pressure. From the results of analysis, the effect of wall thinning defect on the global moment-rotation behavior of elbow was discussed, and the dependence of collapse moment of elbow on wall thinning depth, length, and circumferential angle was investigated under different loading mode and defect location.
A Change and Prediction of Biaxial Fatigue Life of Cast Duplex Stainless Steels by Degradation
Kwon, Jae-Do ; Park, Joong-Cheul ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 410~418
DOI : 10.3795/KSME-A.2004.28.4.410
The multiaxial fatigue test under in-phase and out-of
phase load were performed to study what degradation phenomenon affects fatigue life with virgin and 3600 hrs degraded materials. The various kind of fatigue data fur fatigue life prediction were acquired under pure axial and pure torsional load of fully reversal condition. The models which was investigated are: 1) the von Mises equivalent strain range, 2) the critical shear plane approach method of Fatemi-Socie(FS) parameter, 3) the modified Smith-Watson-Topper(SWT) parameter. The result showed that, fatigue life by material degradation are decreased and life prediction which was used the FS parameter is not conservative but the best result.
A Study on Dynamic Behavior of Simply Supported Fluid Flow Pipe with Crack and Moving Mass
Yoon, Han-Ik ; Jin, Jong-Tae ; Son, In-Soo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 419~426
DOI : 10.3795/KSME-A.2004.28.4.419
In this paper, studied about the effect of open crack and the moving mass on the dynamic behavior of simply supported pipe conveying fluid. The equation of motion is derived by using Lagrange`s equation. The influences of the velocity of moving mass, the velocity of fluid flow and a crack have been studied on the dynamic behavior of a simply supported pipe system by numerical method. The crack section is represented by a local flexibility matrix connecting two undamaged beam segments. Therefore, the crack is modelled as a rotational spring. Totally, as the velocity of fluid flow is increased, the mid-span deflection of simply supported pipe conveying fluid is increased. The position of the crack is located in the middle point of the pipe, the mid-span deflection of simply supported pipe presents maximum deflection.
Low Cycle Fatigue Behavior of 429EM Stainless Steel at Elevated Temperature
Lee, Keum-Oh ; Yoon, Sam-Son ; Hong, Seong-Gu ; Kim, Bong-Soo ; Lee, Soon-Bok ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 427~434
DOI : 10.3795/KSME-A.2004.28.4.427
Ferritic stainless steel is recently used in high temperature structures because of its good properties of thermal fatigue resistance, corrosion resistance, and low price. Tensile and low-cycle fatigue (LCF) tests on 429EM stainless steel used in exhaust manifold were performed at several temperatures from room temperature to 80
. Elastic Modulus, yield strength, and ultimate tensile strength monotonically decreased when temperature increased. Cyclic hardening occurred considerably during the most part of the fatigue life. Dynamic strain aging was observed in 200~50
, which affects the cyclic hardening behavior. Among the fatigue parameters such as plastic strain amplitude, stress amplitude, and plastic strain energy density (PSED), PSED was a proper fatigue parameter since it maintained at a constant value during LCF deformation even though cyclic hardening occurs considerably. A phenomenological life prediction model using PSED was proposed considering the influence of temperature on fatigue life.
On-Chip Process and Characterization of the Hermetic MEMS Packaging Using a Closed AuSn Solder-Loop
Seo, Young-Ho ; Kim, Seong-A ; Cho, Young-Ho ; Kim, Geun-Ho ; Bu, Jong-Uk ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 435~442
DOI : 10.3795/KSME-A.2004.28.4.435
This paper presents a hermetic MEMS on-chip package bonded by a closed-loop AuSn solder-line. We design three different package specimens, including a substrate heated specimen without interconnection-line (SHX), a substrate heated specimen with interconnection-line (SHI) and a locally heated specimen with interconnection-line (LHI). Pressurized helium leak test has been carried out for hermetic seal evaluation in addition to the critical pressure test for bonding strength measurement. Substrate heating method (SHX, SHI) requires the bonding time of 40min. at 400min, while local heating method (LHI) requires 4 min. at the heating power of 6.76W. In the hermetic seal test. SHX, SHI and LHI show the leak rates of 5.4
mbar-l/s and 18.5
mbar-l/s, respectively, for an identical package chamber volume of 6.89
. In the critical pressure test, no fracture is found in the bonded specimens up to the applied pressure of 1
0.1MPa, resulting in the minimum bonding strength of 3.53
0.07MPa. We find that the present on-chip packaging using a closed AuSn solder-line shows strong potential for hermetic MEMS packaging with interconnection-line due to the hermetic seal performance and the shorter bonding time for mass production.
The Effect of Load Orientation for Crack Propagation and Acoustic Emission Evaluation on Plain Woven CFRP
Kwon, Oh-Heon ; Yun, Yu-Seong ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 443~452
DOI : 10.3795/KSME-A.2004.28.4.443
In recent year, composite materials are increasingly used in various fields of engineering because of its superior properties. The relationships of between crack propagation and AE characteristics fer CFRP plain woven laminate composites are examined. AE signals are measured during the fracture behavior tests. The purpose of study is to estimate the crack extension behavior with AE characteristics according to the load orientation fur plain woven CFRP laminate composite.
Effect of Room Temperature Prestrain on Creep Life of Austenitic 25Cr-20Ni Stainless Steels
Park, In-Duck ; Ahn, Seok-Hwan ; Nam, Ki-Woo ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 453~459
DOI : 10.3795/KSME-A.2004.28.4.453
25Cr-20Ni series strainless steels have an excellent high temperature strength high oxidation and high corrosion resistance. However, further improvement can be expected of creep strength by work hardening prior creep. In the present study, the effect of prestraining at room temperature on the creep behavior of a Class M(STS310S) and a Class A(STS310J1TB) alloy containing precipitates have been examined. Prestaining was carried out at room temperature and range of prestrain was 0.5-2.5 % at STS310J1TB and 2.0-7.0% at STS310S. Creep behavior and creep rate of pre-strained specimens were compared with that of virgin specimens. Room temperature prestraining produced the creep life that is longer than that of a virgin specimen both for STS310J1TB and STS310S when creep test was carried out at the temperature lower than recrystallization temperature. The reason for this improvement of creep life was ascribable to the interaction between dislocations and precipitates in addition to the dislocation-dislocation interaction in STS310J1TB and the dislocation-dislocation interaction in STS310S. The beneficial effect of prestraining in STS310J1TB was larger than that of STS310S.
Evaluation of Thermal Embrittlement Susceptibility in Cast Austenitic Stainless Steel Using Artificial Neural Network
Kim, Cheol ; Park, Heung-Bae ; Jin, Tae-Eun ; Jeong, Ill-Seok ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 460~466
DOI : 10.3795/KSME-A.2004.28.4.460
Cast austenitic stainless steel is used for several components, such as primary coolant piping, elbow, pump casing and valve bodies in light water reactors. These components are subject to thermal aging at the reactor operating temperature. Thermal aging results in spinodal decomposition of the delta-ferrite leading to increased strength and decreased toughness. This study shows that ferrite content can be predicted by use of the artificial neural network. The neural network has trained teaming data of chemical components and ferrite contents using backpropagation learning process. The predicted results of the ferrite content using trained neural network are in good agreement with experimental ones.
Structural Optimization of Truss with Non-Linear Response Using Equivalent Linear Loads
Park, Ki-Jong ; Park, Gyung-Jin ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 467~474
DOI : 10.3795/KSME-A.2004.28.4.467
A numerical method and algorithms is proposed to perform optimization of non-linear response structures. An analytical and numerical method based finite element method is also proposed for the transformation of non-linear response into linear response. Loads transformed from this method are defined as the equivalent linear loads. With the loads and the transformed response, linear static optimization is performed for nonlinear response structure with geometric and/or material non-linearity. The results of the optimization are compared with them of typical non-linear response optimization using finite difference method. The proposed method is very efficient and derives good solution.
Function Approximation Using an Enhanced Two-Point Diagonal Quadratic Approximation
Kim, Jong-Rip ; Kang, Woo-Jin ; Choi, Dong-Hoon ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 475~480
DOI : 10.3795/KSME-A.2004.28.4.475
Function approximation is one of the most important and active research fields in design optimization. Accurate function approximations can reduce the repetitive computational effort fur system analysis. So this study presents an enhanced two-point diagonal quadratic approximation method. The proposed method is based on the Two-point Diagonal Quadratic Approximation method. But unlike TDQA, the suggested method has two quadratic terms, the diagonal term and the correction term. Therefore this method overcomes the disadvantage of TDQA when the derivatives of two design points are same signed values. And in the proposed method, both the approximate function and derivative values at two design points are equal to the exact counterparts whether the signs of derivatives at two design points are the same or not. Several numerical examples are presented to show the merits of the proposed method compared to the other forms used in the literature.
Experimental Study of the Growth of the SiC Rod using Nd-Yag Laser Chemical Vapor Deposition
Lim, Young ; Ryu, Jae-Eun ;
Transactions of the Korean Society of Mechanical Engineers A, volume 28, issue 4, 2004, Pages 481~488
DOI : 10.3795/KSME-A.2004.28.4.481
Laser chemical vapor deposition can be used as a new approach for a rapid prototyping technique. The purpose of the study is to fabricate several 3-dimensional objects that are relatively simple as well as to find the characteristics of SiC rod growth that is the first step in developing a new rapid prototyping technique with laser chemical vapor deposition. In the study, SiC rods were generated with varying precursor pressure for 5 minutes. Deposition rates with varying precursor pressure, shapes of rods, surface roughness and component organization were investigated, in particular. Finally, several simple objects like a branch or a propeller were successfully fabricated using laser chemical vapor deposition.