Subjects: Mechanics >> Applied Mechanics submitted time 2020-12-18
Abstract： In order to enhance the overall structural stability of 3D printed concrete wall, we propose a novel scheme to produce a wavy wall with curvature along its contour direction. To validate the idea of the scheme, a single wave wall is set as a cylindrical wall and its mechanical performances are analyzed. The mathematical 3D printing model of the wavy wall is formulated by the shell theory while taking into account of additional parameters of the printing processes, the model will be used to analyze the two failure mechanisms of the cylindrical wall: elastic buckling and plastic collapse. Compared with the results of Suiker’s straight wall, it is found that when the parameters were same, the stability of the cylindrical wall is more than twice of the rectangular wall. Our studies indicate that it’s a feasible scheme to improve the printed structural stability by increasing curvature.
Peer Review Status:
Awaiting Review
Subjects: Mechanics >> Applied Mechanics submitted time 2020-12-10
Abstract： In order to enhance the overall structural stability of 3D printed concrete wall, this paper proposes a novel scheme to produce a wavy wall with a curvature along its contour direction. To validate the idea of the scheme, a single wave wall is set as a cylindrical wall and its mechanical performances are analyzed. The mathematical 3D printing model of the wavy wall is formulated by the shell theory while taking into account of additional parameters of the printing processes, the model will be used to analyze the two failure mechanisms of the cylindrical wall: elastic buckling and plastic collapse. Compared with the results of Suiker's straight wall, it is found that when the parameters were same, the stability of the cylindrical wall is more than twice of the rectangular wall. Our studies indicate that it's a feasible scheme to improve the printed structural stability by increasing curvature. " "
Peer Review Status:Awaiting Review
Subjects: Mechanics >> Solid Mechanics submitted time 2020-10-13
Abstract： Based on Zhang-Yu's work, this paper analyzes the energy absorption capacity of the Caladine-English crooked plates energy absorber in detail. We used Maple software to write a general program for the Zhang-Yu energy absorber equation of the Caladine-English crooked plates energy absorber, and for the first time obtained the generalized coordinate (rotation angle) of the energy absorber over time. On this basis, a comparative study was made on the influence of different parameter changes on the energy absorption capacity of Caladine-English crooked plates energy absorber. In order to define the energy absorption factor, the energy absorption capacity of the structure was described. In order to better understand the effect of the movement of the energy absorber by parameter changes, we calculated the phase diagram of the energy absorber dynamics. After a lot of numerical simulations, it is found that the 4 crooked plates energy absorber should be a ``mass sensitive" type of energy absorber in terms of energy absorption capacity, which fully supports Zhang-Yu's conclusion: the Caladine-English crooked plates energy absorber is ``Mass sensitive" type energy absorber.
Peer Review Status:Awaiting Review
Subjects: Mechanics >> Applied Mechanics submitted time 2020-08-25
Abstract： The aim of this work is to investigate the buckling of the cylindrical shells based on the non-linear finite element analysis program ABAQUS and applied to the buckling analysis of cola cans. Buckling analysis of soda cans by means of comparing the numerical results with experimental data of Virot et al. In order to obtain some qualitative results of buckling, the buckling behaviour of the cylindrical shells will be investigated. In this article, we focus on the effect of different load combinations and different geometric parameters of the cylindrical shells. The straightforward, simple analysis of the buckling of the cylindrical shells under the axially compressed-lateral perturbation load is presented. We show that the three-dimensional curve of external force-buckling load-displacement called landscape. The numerical results indicate that: the phenomenon of "cliff" appears in the force-displacement curve of specimens under the action of lateral pressure-axially compressed-torsional load; It will be appreciated that the torsional is not conducive to the stability of the specimen and makes the specimen sensitive to the initial imperfections; For specimen under axially compressed-torsional load, in this paper, the plane with zero bearing capacity is defined as "sea level" to distinguish failure modes of specimens; The results of specimens with different boundary conditions shows that the bearing capacity of the cylindrical shells can be improved with fixed boundaries. The internal pressure can greatly improve the bearing capacity and stability of the structure and reduce the imperfection-sensitivity. "
Peer Review Status:Awaiting Review
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2017-11-24
Abstract： This study considers the periodic orbital period of an n-body system from the perspective of dimension analysis. According to characteristics of the n-body system with point masses $(m_1,m_2,...,m_n)$, the gravitational field parameter, $\alpha \sim Gm_im_j$, the n-body system reduction mass $M_n$, and the area, $A_n$, of the periodic orbit are selected as the basic parameters, while the period, $T_n$, and the system energy, $|E_n|$, are expressed as the three basic parameters. By using Buckingham $\pi$-theorem of dimensional analysis, these two relations can be reduced to a dimensionless form, which can surprisingly produce only one dimensionless $\pi$, respectively. Because there is only one $\pi$, therefore the $\pi$ must be a constant. Since the two-body system is a special case of the n-body, we can uniquely determine the two constants by using the two-body Kepler's third law. Thus, the n-body system Kepler's third law is deduced and is given by $T_n|E_n|^{3/2}=\frac{\pi}{\sqrt{2}} G\left(\frac{\sum_{i=1}^n\sum_{j=i+1}^n(m_im_j)^3}{\sum_{k=1}^n m_k}\right)^{1/2}$. A numerical validation and comparison study was hence conducted.
Peer Review Status:Awaiting Review
Subjects: Physics >> Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics submitted time 2017-09-30
Abstract： This paper uses dimensional analysis to define the general expression of the pair $(N,\ell)$, and identifies the dominant combination-parameters of the capillary wrinkling problem, while it also determines the dominant parameters of different problems relating to its use. The dimensional analysis results reveal that, in general, there are no universal scaling laws for capillary wrinkling. Only for a small/moderate deformation, it was found that the wrinkling number $N$ is mainly controlled by the ratio of bending stiffness and surface tension, while the wrinkling length $\ell$ is controlled by the ratio of in-plane stiffness and surface tension. Having linear physical relationship in the case of the small deformation, simpler scaling laws are proposed for the pair $(N,\ell)$. The universality of the scaling laws, which are verified by the dimensional analysis, will give us more confidence. As a natural extension, we gave the pair $(N,\ell)$ a thin film case made of axisymmetric anisotropic materials. By using Tanner's scaling laws, we obtained dynamical scaling laws for a drop radius and the pair $(N,\ell)$, which shows that the pair $(N,\ell)$ will fade away with time. Finally, we obtained the pair $(N,\ell)$ within the gravity regime.
Peer Review Status:Awaiting Review
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