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| 1 | A Deep Learning-Based Computational Algorithm for Identifying Damage Load Condition: An Artificial Intelligence Inverse Problem Solution for Failure Analysis显示文摘In this work,we have developed a novel machine(deep)learning computational framework to determine and identify damage loading parameters(conditions)for structures and materials based on the permanent or residual plastic deformation distribution or damage state of the structure.We have shown that the developed machine learning algorithm can accurately and(practically)uniquely identify both prior static as well as impact loading conditions in an inverse manner,based on the residual plastic strain and plastic deformation as forensic signatures.The paper presents the detailed machine learning algorithm,data acquisition and learning processes,and validation/verification examples.This development may have significant impacts on forensic material analysis and structure failure analysis,and it provides a powerful tool for material and structure forensic diagnosis,determination,and identification of damage loading conditions in accidental failure events,such as car crashes and infrastructure or building structure collapses. | Shaofei Ren Guorong Chen Tiange Li Qijun Chen Shaofan Li | 2018 | Computer Modeling in Engineering & Sciences2018，，12： | 3 |
| 2 | The contribution of photoinduced charge-transfer enhancement to the SERS of uranyl(Ⅵ) in a uranyl-Ag_2O complex显示文摘Charge-transfer(CT) is an important enhancement mechanism in the field of surface-enhanced Raman scattering(SERS) that typically increases the Raman intensity of molecules by as much as 10–100 times.Herein, a low-cost Ag_2O aggregates substrate was prepared via a facile chemical precipitation method,and the calculated CT-based enhancement factor of the uranyl ions adsorbed on it reached as high as 10~5, a metal-comparable value. The efficient photoinduced CT process from the valence band of Ag_2O to the LUMO of uranyl ions under appropriate excitation sources resulted in the repulsion of the axial oxygen atoms of the O=U=O bond, which enhanced its polarizability, creating a more intense Raman mode. To the best of our knowledge, this study firstly reports such a strong photoinduced CT enhancement of uranyl ions, with concentrations of 10^(-8) mol L^(-1) or lower being detected using this Ag_2O substrate. Most importantly, this research has shown that the photoinduced CT enhancement also contributes to the SERS of uranyl ions on pure Ag substrates which have often been ascribed to the electromagnetic enhancement in previous studies. In addition, Ag_2O can be used to selectively detect uranyl ions without interference from many other molecules or ions because of the energy matching rule of the photoinduced CT process, which was readily available for uranyl detection in the environmental aqueous solution. | Shaofei Wang Shanli Yang Haoxi Wu Jiaolai Jiang Lang Shao Yiming Ren Yingru Li Chuanhui Liang Mingfu Chu Xiaolin Wang | 2019 | Science Bulletin2019，64，5： | 1 |
| 3 | The Nonlinear Coupling of Oscillating Bubble and Floating Body with Circular Hole显示文摘The fluid-structure interaction of the oscillating bubble and floating body with circular hole is essentially the nonlinear coupling problem among the incomplete movable boundary,free surface and bubble.This problem is particularly complicated in bubble dynamics.Combined with the volume of fluid method,the Eulerian finite element method is employed to deal with the fluid movement.Based on the improved penalty immersed boundary method,the transient axisymmetric numerical model is established in this paper,considering the fluid-structure interaction effect.The results of simulation are consistent with those of the electric discharge bubble experiment and explosion experiment.Subsequently,considering the influence of the hole size,floating body density,explosive location,and buoyancy,this complex fluid-structure interaction problem is analyzed systematically.Through numerical simulation,we get some new conclusions.When the radius of the hole Rh less than the maximum radius of the oscillating bubble,the changes in the whole system are incredibly intense,and the free surface crushing will emerge.The energy of the bubble acts more on the radial direction of the floating body,when the explosive location parameter is small.When the floating body has the same density as the water,the multiple spike skirt is displayed vividly.And the buoyancy of fluid can produce a lifting effect on the floating body. | Ming He Yunlong Liu Shaofei Ren Wentao Liu | 2021 | Computer Modeling in Engineering & Sciences2021，，6： | 0 |
| 4 | Research on the Fragment Impact Resistance of a Composite Mast显示文摘Due to the unique structural mode and material property of a composite sandwich plate, related research such as fragment impact resistance of a composite mast is short of publication and urgent in this field. In this paper, the commonly accepted sandwich core board theory was modified. Damage caused by a fragment attack was simulated onto a sandwich plate model built with solid and shell elements. It was shown that shear failure and vast matrix cracking are the main reasons for outer coat damage, and tension failure and partial matrix cracking are the cause for inner coat damage. Additionally, according to complexities in actual sea battles, different work conditions of missile attacks were set. Ballistic limit values of different fragment sizes were also obtained, which provides references for enhancing the fragment impact resistance of a composite mast. | Wei Zhang Chao Wu Wenshan Yang Shanshan Xu Shaofei Ren | 2011 | Journal of Marine Science and Application2011，10，3： | 0 |
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