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This paper presents evolutionary-based optimization procedure for designing truss structures. The Shuffled Complex Evolution optimizer (SCEO) is used for solving the nonlinear constrained optimization problems. In this optimum design formulation, the objective function is the material weight of the truss; the design variables are the cross-sections of the truss members; the constraints are the stresses...
In this paper, a new approach for constructing the two-order and two-scale approximate solution to the elliptic problem with the sharply periodic oscillation coefficients is developed. The results of many numerical experiments for different two-order and two-scale approaches, in those the one-order local solution and two-order local solution defined in reference cell respectively satisfy different...
In order to obtain information on the lateral buckling strength of stainless steel I-beams to propose the design formulae for the stability factors, this paper focuses on the overall buckling of laterally-unrestrained stainless steel I-beams. The design methods in current codes are discussed, and the results from these codes are compared with the finite element analysis (FEA) results. The influence...
Based on stability theory and nonlinear finite element (FE) method, ANSYS finite element models (FEM) are presented, which introduce shell181 and take geometric and material nonlinear into account. The seismic behavior of rectangular section steel members under the axial compression and the bending load is investigated. The effect of length-slender ratio, width-thickness ratio of flange and web, axial-compression...
CST is a new kind of vehicle passive safety device. In order to study the difference of CST for different weight vehicles, UG, VPG, LS-DYNA would be used to simulate and calculate, and it showed that influence of vehicle weight on CST shear fracture and blunt edge roundness is very great, this could provide a strong foundation for the study of CST on different vehicles, and also has great reference...
The overall load-bearing capacity and cushioning function of a molded pulp packaging result from those of structural units. For each structural unit, its geometrical shape and dimensions can be identified to determine the performance of molded pulp product. The commercial code ANSYS was employed in the present study due to its high performance in non-linear analysis. The non-linear buckling behavior...
A finite element (FE) modeling of coverboard is conducted, and the deflection and stresses of the coverboard for intended application are discussed. Based on the FE analysis, a feasible thickness value of the coverboard which satisfies the deflection requirement is recommended for potential manufacturing.
Welded box column is main compression member of steel structure, and residual stress is the most important factor affecting the ultimate bearing capacity of box column. Based on ANSYS system, whole welding process is simulated by three dimension thermal elastic-plastic finite element method, element strain and node displacement solve by the node temperature change of established temperature interpolation...
As the most critical component of a deep manned submersible, the manned pressure hull provides a safe living space for pilots and scientists under the deep sea pressure and its weight occupies almost 1/3 total weight of the manned submersible. So the pressure hull should be designed to have enough strength and should be as light as possible. However, a comparison of the current available design rules...
To a supersonic missile, a seeker could enhance the aerodynamic ability due to decrease the resistance in flying. At the same time, the primary function of a seeker has been considered as the most important equipment for a missile, due to the importance for cueing of targets and tracking for the final approach. However, the dome of a seeker, which is made up of glass, has poor mechanical performance...
The revolute outputs effected by the clearances of joints which are caused by the inaccurate precision of processing and error of assembly are analyzed at first, then in order to illustrate the problem the simulation of a kind of parallel mechanism named 3-PRUR is also done in Pro/E and Adams software. At last a kind of compliant revolute joint called split-tube flexural pivots based on the principle...
A 3-D finite element model of two-stage thermoelectric generator based on low-temperature thermoelectric material bismuth-telluride and medium-temperature thermoelectric material skutterudites is established. Based on the formal model, structural optimization of the two-stage thermoelectric generator is carried out. Results show that, reasonable design of the structure of two-stage thermoelectric...
By analysis, a series of numerical analysis for the characteristics of shaft stress of CFG pile are performed, considering the nonlinearity of various materials in composite foundation, and some laws are got, on which the characteristics of shaft stress in different parts of CFG pile is affected by the thickness of cushion, the modulus of cushion,the modulus of the soil between piles and the length...
Based on the Hertz linear elastic contact theory, the maximum contact pressure and contact width of wheel-rail are obtained. It follows the oval distribution regularly in combination with the formulation of contact pressure. Referring to contact width, the contact area is defined by redevelopment. Nonlinear contact problem has been analyzed by applying three dimensional finite element model. It is...
Two-dimensional (2D) numerical calculation is usually conducted to determine the type of the retaining wall for an embankment. However, such calculation method is not suitable for the retaining wall within a V-shaped deep valley: The retaining wall receives pressures both from the embankment above and the sides of the valley, thus conventional 2D method is inadequate to reflect its stress-deformation...
A floating protection system is presented to protect bridge structures from vessel impacts. Based on general contact-impact nonlinear finite element technique, the high resolution models of the 5,000-DWT ship and the protection system are developed to evaluate the performance of the floating protection system under vessel collisions. The results show that the protection system can effectively absorb...
Simulation of geosynthetic-soil interaction is a key problem in numerical analysis of geosynthetic-structure. This paper introduces systematically the state-of-the-art of simulation methods of geosynthetic-soil interaction, including various interface calculation methods and constitutive models. The advantages and disadvantages of the methods and models are also assessed and analyzed. Based on such...
Based on ADINA, nonlinear analysis with monotonic and hysteretic loading modes was applied to research the failure modes and bearing capacity of multi-dimensional CHS joints with different construction parameters in tree pipe structure. In non-linear Full Newton-Raphson algorithm, low speed dynamic damping factor was adopted to restrain the sub-dynamic effect to implement the whole process of quasi-transient...
The most key factor in the modern sheet metal process is an accurate dimension of final shape part. The accurate simulation of the drawing products will not be useful since springback will occur after the tools are removed off the drawing die set. One of the most promising ways to solve this problem is modify the die surface as known die compensation. Die compensation is one of the hottest topics...
Excavation in soft soil will lead to changes in stress state ground mass and subsequent ground losses inevitably occur. These changes affect the surrounding ground in the form of lateral movement which eventually impose direct strains onto nearby structures and can cause pile deviation and cracks. This study models the lateral movement in soft clay due to excavation using finite element simulation...
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