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이태현(Taehyun Lee),윤재영(Jae Young Yoon),류경하(KyungHa Ryu),박종원(Jong Won Park) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.3
Purpose: Probabilistic safety analysis was performed to enhance the safety and reliability of nuclear power plants because traditional deterministic approach has limitations in predicting the risk of failure by crack growth. The study introduces a probabilistic approach to establish a basis for probabilistic safety assessment of passive components. Methods: For probabilistic modeling of fatigue crack growth rate (FCGR), various FCGR tests were performed either under constant load amplitude or constant ΔK conditions by using heat treated X-750 at low temperature with adequate cathodic polarization. Bayesian inference was employed to update uncertainties of the FCGR model using additional information obtained from constant ΔK tests. Results: Four steps of Bayesian parameter updating were performed using constant ΔK test results. The standard deviation of the final posterior distribution was decreased by a factor of 10 comparing with that of the prior distribution. Conclusion: The method for developing a probabilistic crack growth model has been designed and demonstrated, in the paper. Alloy X-750 has been used for corrosion fatigue crack growth experiments and modeling. The uncertainties of parameters in the FCGR model were successfully reduced using the Bayesian inference whenever the updating was performed.
자동차 충돌해석을 위한 구조용 접착제 유한 요소 해석 모델 개발
이태현(Taehyun Lee),신성기(Shounggi Shin) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A very successful approach among the many things done is the use of structural adhesive, which have brought significant improvements in automobile for the reason that adhesive-bonded joints can reduce the stress concentration compared to mechanical joints, increase strength and endure against the environment variable such as corrosion. The objective of this paper is to develop structural adhesive model for car crash analysis. The power of the FEA for predicting the structural integrity of adhesively bonded vehicle structure is apparent. To obtain mechanical properties of the adhesives, First, Tensile test and shear test were carried out for material properties of structural adhesive such as young's modulus, shear modulus, strain- stress curves. Second, correlation between test and FEA is conducted to verify that the adhesive material properties derived earlier do indeed represent the mechanical properties of the physical adhesives in the single lap shear test, T-peel test, wedge impact test, three point bending test and compression test.