Structural optimization with fatigue life constraints

Elsayed, Mohamed; Lund, E.H.

doi:10.1016/0013-7944(90)90057-n

Cited by 19 publications

(15 citation statements)

References 3 publications

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“…Due to the general trend of producing lighter and safer vehicles, it has become imperative to consider the durability of the structure being optimized. This can be achieved by finding the optimum thickness distribution for a minimum specified fatigue life value as an extra constraint in the optimization process [1 ].…”

Section: Motivationmentioning

confidence: 99%

“…As the components become more complex, the more difficult it is to apply analytical techniques to predict fatigue life. Hence, numerical approaches have been developed that make it possible to effectively analyze complex structures and obtain solutions faster [1,5]. One of the popular numerical approaches is the finite element method (FEM) that allows designers and engineers to create virtual models of components and perform simulations in the preliminary design stage.…”

Section: Motivationmentioning

confidence: 99%

“…In the automotive industries, due to the general trend of producing lighter vehicle, it has become important to consider the durability of the structure being optimized. This can be achieved by using a minimum fatigue life value as an extra constraint in the optimization process [1]. A critical element is defined as the element with lowest fatigue life value in the FEM of structure that determines the fatigue life of whole structure.…”

Section: Overviewmentioning

confidence: 99%

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Fatigue Analysis of Fuel Tank Straps Due to Slosh Loads

Fereidonni¹

2021

Preprint

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A great number of investigations on fatigue analysis and liquid sloshing has been carried out in different fields of application such as space vehicles, large ground tanks, cargo ships, and highway truck tankers. A variety of approaches to solve the sloshing problem due to different requirements, tank characteristics, and peculiarities of input disturbance gives different, sometimes contradictory, results which are not directly applied to the car tank system. One of the most important components in the fuel tank system is strap, which has vital role in road safety. Fuel tank strap can be separated due to fatigue during vehicle operation, causing the tank to be unsupported and increasing the risk of fuel leak. Its failure can cause very dangerous accidents. The effect of sloshing load, one of the main applied loads on the tank structure, on life of the strap has not been studied carefully before. This thesis presents the numerical analysis of liquid behaviour in sloshing situation and the fatigue analysis of the fuel tank straps due to slosh loads exerted on the tank walls in an accelerating car. In this study, computational fluid dynamics (CFD) and finite element method (FEM) are employed to simulate transient sloshing of fuel inside the tank and find the location of the critical point of crack initiation and predict the life of the fuel tank strap. Using the volume of fluid (VOF) method, a new developed method in CFD, the range of loads on the walls of the fuel tank is determined for the operational conditions that the vehicle experience. An equivalent mechanical model is developed to verify the CFD sloshing simulation result through the normal impact load applied by the effective mass of a pendulum system. The finite element (FE) is further used to create the virtual model of the strap and perform a static analysis. The stresses and strains from the static analysis are then used as input to locate the critical point and predict the life expectancy of the strap under slosh loading.

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Section: Motivationmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

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Fatigue Analysis of Fuel Tank Straps Due to Slosh Loads

Fereidonni¹

2021

Preprint

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“…In 1990, M.E.M. EL-SAYED and E.H. LUND studied the structural optimization problems while take the fatigue life as the constraint condition, and discussed the method of calculating the fatigue life [2]. In 1997, Gerhard proposed to replace the fatigue life of structures under the complex geometry and complex loading conditions with a response surface model, converting it to a optimization problem that take the fatigue life as constraints and the minimum weight as the optimization object [3].…”

Section: Introductionmentioning

confidence: 99%

An Improved PSO Algorithm and its Application to Structural Fatigue Life Optimization

Liu

Xue

Tan

2010

2010 International Conference on Intelligent Computation Technology and Automation

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Particle swarm optimization is a new type of intelligent optimization algorithm. In order to improve the efficiency of structural fatigue optimization, a novel optimization strategy based on the improved particle swarm optimization algorithm is proposed. According to this strategy, one optimization software is developed. As an application of this strategy, the fatigue optimization of a landing gear is presented. The results show that the optimization results are better than that of traditional optimization method. This improved algorithm with high efficiency and better results has a good promising to the structural fatigue life optimization.

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“…In the past several years, the structure optimization method considering the fatigue life has been studied by many researchers. El-Sayed and Lund 1 were one of the first to discuss the structural optimization with fatigue life constraints. In their study, the fatigue life prediction, as well as the finite element analysis (FEA), was performed in each iteration step of the optimization.…”

Section: Introductionmentioning

confidence: 99%

Metamodel-based optimization of the bolted connection of a wing spar considering fatigue resistance

Xia

Yao

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part G:

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In this paper, the optimization considering the constraint of fatigue life was conducted on a bolted connection of a wing spar, after which a series of fatigue tests were carried out to verify the optimized result. The object of the optimization was to minimize the weight of the bolted connection. Meanwhile, a constraint of fatigue life was taken into account. Considering the nonlinear relationship between the fatigue life and the design parameters, experimental design and Kriging model were applied in the optimization. In order to reduce the calculation cost of the finite element analysis and the fatigue life prediction, a so-called coupled bolt model was applied and stress severity factor approach was applied to assess the fatigue life of the connection. After the optimization, the weight of the optimized result was only 85.9% of the initial design and the fatigue life of the structure satisfied the constraint condition. In order to evaluate the reasonability of the optimized result, six specimens were machined based on the optimized result. Using these specimens, a series of fatigue tests were carried out. The test results demonstrated that the optimized result could be regarded as the best solution.

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Structural optimization with fatigue life constraints

Cited by 19 publications

References 3 publications

Fatigue Analysis of Fuel Tank Straps Due to Slosh Loads

Fatigue Analysis of Fuel Tank Straps Due to Slosh Loads

An Improved PSO Algorithm and its Application to Structural Fatigue Life Optimization

Metamodel-based optimization of the bolted connection of a wing spar considering fatigue resistance

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