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Effect of axial deformation on Elastic Properties of Irregular Honeycomb Structure

Chinese Journal of Mechanical Engineering 2021年第4期34卷 276-287页

作者： Ning Wang Qingtian Deng School of Science Chang’an UniversityXi’an 710064China

Irregular honeycomb structures occur abundantly in nature and in man-made products,and are an active area of *** this paper,according to the optimization of regular honeycomb structures,two types of irregular honeycomb structures with both positive and negative Poisson’s ratios are *** elastic properties of irregular honeycombs with varying structure angles were investigated through a combination of material mechanics and structural mechanics methods,in which the axial deformation of the rods was *** numerical results show that axial deformation has a significant influence on the elastic properties of irregular honeycomb *** elastic properties of the structure can be considered by the enclosed area of the unit structure,the shape of the unit structure,and the elastic properties of the original *** elastic properties considering the axial deformation of rods studied in this study can provide a reference for other scholars.

关键词： axial deformation Elastic modulus Positive Poisson’s ratio Negative Poisson’s ratio Irregular honeycombs

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A New Simulation Model for Recoil Analysis of Deep-Water Drilling Risers After Emergency Disconnection

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China Ocean Engineering 2023年第4期37卷 637-644页

作者： WU Jun-kang MENG Shuai State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The recoil response of a deep-water drilling riser following an ED(Emergency Disconnection)scenario is a transient and sensitive *** recoiling displacement of the riser is the resultant of recoil motion and axial ***-ever,it is typically represented by one variable in recoil *** axial deformation is quite small compared with axial motion in the recoil process,it inevitably introduces numerical errors(i.e.,a large number annihilating a small number).Thus,it is hard to perform a quantitative analysis of axial deformation,although a consensus initial deformation is essential for recoil ***,the triggered axial natural modes have never been examined *** this study,the recoil response is decomposed into two parts:recoil motion and axial deformation,and a novel model is developed by Galerkin *** has demonstrated that the initial stretch has a significant effect at the initial stage in *** existing models underestimate the effects of axial *** new model can capture information of triggered natural modes and figure out the modes undergoing dynamic *** study can be beneficial to overpull setting,determination of ED time and anti-recoil control optimization.

关键词： recoil analysis drilling riser emergency disconnection axial deformation Galerkin method

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