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RISS 인기검색어
- 검색키워드
- 저자 : Burak Can Cerik (검색결과 8 건)
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Structural reliability analysis of submarine ring-stiffened cylinders based on ultimate strength
Burak Can Cerik,Su-Yong Bae,Sang-Rai Cho 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
A reliability-based structural analysis for submarine pressure hull main component ring-stiffened cylinders is presented. The ultimate limit state of submarine pressure hull is associated with elasto-plastic collapse in various modes. The collapse prediction methods describing the inelastic behavior of ring-stiffened cylindrical shells are reviewed and modeling uncertainties are quantified with available test data compiled. The reliability analysis is performed for an example pressure hull model considering material and geometric uncertainties. It is shown that with probabilistic approach mode interaction and overdiving risks can be accounted contrary to deterministic approach in traditional design methodology. With a parametric study it is confirmed that the sensitivity of failure probability to modeling uncertainties is high. In order to validate the conclusions made for the reference model two experimental models are analyzed and a good agreement is found.
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Structural reliability analysis of submarine ring-stiffened cylinders based on ultimate strength
Burak Can Cerik,Su-Yong Bae,Sang-Rai Cho 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
A reliability-based structural analysis for submarine pressure hull main component ring-stiffened cylinders is presented. The ultimate limit state of submarine pressure hull is associated with elasto-plastic collapse in various modes. The collapse prediction methods describing the inelastic behavior of ring-stiffened cylindrical shells are reviewed and modeling uncertainties are quantified with available test data compiled. The reliability analysis is performed for an example pressure hull model considering material and geometric uncertainties. It is shown that with probabilistic approach mode interaction and overdiving risks can be accounted contrary to deterministic approach in traditional design methodology. With a parametric study it is confirmed that the sensitivity of failure probability to modeling uncertainties is high. In order to validate the conclusions made for the reference model two experimental models are analyzed and a good agreement is found.
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Probabilistic ultimate strength analysis of submarine pressure hulls
Cerik, Burak Can,Shin, Hyun-Kyoung,Cho, Sang-Rai The Society of Naval Architects of Korea 2013 International Journal of Naval Architecture and Oc Vol.5 No.1
This paper examines the application of structural reliability analysis to submarine pressure hulls to clarify the merits of probabilistic approach in respect thereof. Ultimate strength prediction methods which take the inelastic behavior of ring-stiffened cylindrical shells and hemi-spherical shells into account are reviewed. The modeling uncertainties in terms of bias and coefficient of variation for failure prediction methods in current design guidelines are defined by evaluating the compiled experimental data. A simple ultimate strength formulation for ring-stiffened cylinders taking into account the interaction between local and global failure modes and an ultimate strength formula for hemispherical shells which have better accuracy and reliability than current design codes are taken as basis for reliability analysis. The effects of randomness of geometrical and material properties on failure are assessed by a prelimnary study on reference models. By evaluation of sensitivity factors important variables are determined and comparesons are made with conclusions of previous reliability studies.
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Cerik, Burak Can,Ringsberg, Jonas W.,Choung, Joonmo Elsevier 2019 Ocean engineering Vol.187 No.-
<P><B>Abstract</B></P> <P>The MARSTRUCT benchmark study on a small-scale double hull structure penetrated by a hemispherical punch was revisited by employing a combined localized necking and stress-state dependent ductile fracture model. By using the limited information provided to the participants of the benchmark study, the plasticity and fracture model parameters were identified. To model the material behavior beyond moderate plasticity, a combination of the Swift and Voce strain hardening laws was used. The damage indicator framework using the Hosford–Coulomb fracture model, combined with the Domain of Shell-to-Solid-Equivalence (DSSE) concept, was adopted to predict the initiation and propagation of ductile fracture. Using the adopted approach, the predicted instant and force levels corresponding to the fracture initiation in the upper and lower plates were found to be in good agreement with the test results. The deformation of the structural elements was also accurately captured. The benefits of adopting the damage indicator framework and distinguishing different failure modes were investigated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Localized necking dominates the failure of punch-loaded double-hull testmodel. </LI> <LI> Constant fracture strain criterion does not predict well the failure process of dented web-girders. </LI> <LI> Non-proportional loading paths and bending deformation is observed in the failure of outer and inner shells. </LI> <LI> Employing advanced ductile fracture models has considerable benefits for maritime crash simulations. </LI> </UL> </P>
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Probabilistic ultimate strength analysis of submarine pressure hulls
Burak Can Cerik,신현경,조상래 대한조선학회 2013 International Journal of Naval Architecture and Oc Vol.5 No.1
This paper examines the application of structural reliability analysis to submarine pressure hulls to clarify the merits of probabilistic approach in respect thereof. Ultimate strength prediction methods which take the inelastic behavior of ring-stiffened cylindrical shells and hemi-spherical shells into account are reviewed. The modeling uncertainties in terms of bias and coefficient of variation for failure prediction methods in current design guidelines are defined by evaluating the compiled experimental data. A simple ultimate strength formulation for ring-stiffened cylinders taking into account the interaction between local and global failure modes and an ultimate strength formula for hemispherical shells which have better accuracy and reliability than current design codes are taken as basis for reliability analysis. The effects of randomness of geometrical and material properties on failure are assessed by a prelimnary study on reference models. By evaluation of sensitivity factors important variables are determined and comparesons are made with conclusions of previous reliability studies.
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Comparative Study on Various Ductile Fracture Models for Marine Structural Steel EH36
Sung-Ju Park,Kangsu Lee,Burak Can Cerik,Joonmo Choung 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.3
It is important to obtain reasonable predictions of the extent of the damage during maritime accidents such as ship collisions and groundings. Many fracture models based on different mechanical backgrounds have been proposed and can be used to estimate the extent of damage involving ductile fracture. The goal of this study was to compare the damage extents provided by some selected fracture models. Instead of performing a new series of material constant calibration tests, the fracture test results for the ship building steel EH36 obtained by Park et al. (2019) were used which included specimens with different geometries such as central hole, pure shear, and notched tensile specimens. The test results were compared with seven ductile fracture surfaces: Johnson-Cook, Cockcroft-Latham-Oh, Bai-Wierzbicki, Modified Mohr-Coulomb, Lou-Huh, Maximum shear stress, and Hosford-Coulomb. The linear damage accumulation law was applied to consider the effect of the loading path on each fracture surface. The Swift-Voce combined constitutive model was used to accurately define the flow stress in a large strain region. The reliability of these simulations was verified by the good agreement between the axial tension force elongation relations captured from the tests and simulations without fracture assignment. The material constants corresponding to each fracture surface were calibrated using an optimization technique with the minimized object function of the residual sum of errors between the simulated and predicted stress triaxiality and load angle parameter values to fracture initiation. The reliabilities of the calibrated material constants of B-W, MMC, L-H, and HC were the best, whereas there was a high residual sum of errors in the case of the MMS, C-L-O, and J-C models. The most accurate fracture predictions for the fracture specimens were made by the B-W, MMC, L-H, and HC models.
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