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RISS 인기검색어
- 검색키워드
- 주제어 : Goodman equation (검색결과 5 건)
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- 유료
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PARK, S. J.,KIM, K. S.,KIM, H. S. Blackwell Publishing Ltd 2007 Fatigue & Fracture of Engineering Materials and St Vol.30 No.11
<P>ABSTRACT</P><P>The ratcheting behaviour of Inconel 718 was investigated at 649 °C under uniaxial cyclic loading. Stress-control tests have been conducted at various combinations of stress amplitude and mean stress. The ratcheting strain at failure increases with increasing mean stress for a given stress amplitude and with decreasing stress amplitude for a given mean stress. Fatigue lives were correlated using three mean stress models: the Goodman equation, the Smith–Watson–Topper (SWT) parameter and the Walker parameter. It has been shown that the Goodman equation and the SWT parameter do not correlate life data, while the Walker parameter yields acceptable correlation. The SWT parameter was modified to incorporate the ratcheting effect. The new parameter is found to yield correlation similar to that of the Walker parameter.</P>
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정정래(Jeongrae Jeong),김길영(Kil-yeong Kim),박상준(Sangjun Park) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this paper, the structural fatigue evaluation of the main rotor actuator(MRA) for rotorcraft is performed. All fatigue load cases of the MRA are estimated based on performance. The stress values for impulse and low/high cycle fatigue loads are calculated on typical components of the MRA using commercial Finite Element Analysis S/W. The calculated stress results are converted to alternating stresses using modified Goodman equation and then the fatigue margins of each case are evaluated by comparing alternating stresses with each material fatigue strength.
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Fatigue Life Prediction of Composite Laminate Based on Stress of Fiber and Matrix of UD Composite
주영식,김민성 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.2
This study investigates fatigue life prediction methodologies to establish a fatigue life evaluation technology for composite structures. Owing to the anisotropy of composite materials, a significant difference can be observed in their fatigue lives depending on stacking sequences or load directions. The fatigue life of a composite is closely related to the fatigue properties of its fiber and matrix. Depending on the mechanical contribution of the composite, its mechanical properties as well as fatigue life characteristics vary. In this study, the S–N data of fibers and matrixes were generated based on the fatigue test results and used as the basic fatigue properties for fatigue life prediction. The principal stress of the fiber and matrix was used to predict the fatigue life of laminates with different stacking sequences. To correct the mean stress of the fatigue loads, the Goodman equation was normalized using tensile and compressive strength. A comparison of the life prediction and test results of composite laminates demonstrated that the proposed methodologies predicted the test results well.
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A Study on Life Estimation of Hot Forging Die
김용조,최창혁 한국정밀공학회 2009 International Journal of Precision Engineering and Vol. No.
In this study, the forging die life was investigated using fatigue life and wear quantity, which are generally considered for estimation of die life. The main aim is development of the equations to adapt finite element analysis to life estimation for a hot forging die. The Archard's model was used to estimate the wear life of the die and Goodman's and Gerber's equations, using the stress-life method, were applied to estimation of the fatigue life. These techniques were applied to die life estimation for the hot forging die of a ball joint socket used in an autovehicle system. Rigid-plastic finite element analysis was first carried out for the forging process of the ball joint socket and then the elastic stress analysis was performed for the die in order to obtain fundamental data for the prediction of fatigue life. The die stress analysis requires the deforming loads of the workpiece to be translated into the contact loading of the die. In this case, the size of finite elements of the die and the workpiece is important for good interpolation of the loading. Therefore, the influence of element sizes on the interpolation results of the contact loading was also investigated. The wear volume of the die was measured using a 3-dimensional scanner of probe type. It was found that the measurement had a good agreement with the results of the finite element analysis for the die life estimation.
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최정훈(Jung-Hun Choi),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok),송원근(Weon-Keyu Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In case of large steel water pipe, it have been observed that its fracture mostly occurs due to the complicated outside fatigue load on the pipe in the underground. It is also well known that its damage and leakage happen mainly in a weld zone. In this study we evaluated the fatigue characteristics based on size effect and residual stress by comparing the test results on the standard specimen collected from real pipe with those on full scale pipe.
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