Energy absorption behavior of tailor-welded tapered tubes under axial impact loading using coupled FEM/SPH method

In the realm of van design, researchers have been diligently working to enhance rollover crashworthiness while concurrently achieving lightweight body structures. Unlike front and side impacts, rollover crashworthiness is impacted by a greater number of structural dimensions and material parameters. As such, this paper implements an unreplicated saturated factorial design to conduct factor screening for vehicle rollover crashworthiness. This approach effectively and accurately resolves the screening challenges that arise from large numbers of factors, and eliminates dependence on traditional design experience. Consequently, it shortens the design cycle and reduces development costs. In addition, this paper establishes four Kriging approximate models that describe the specific energy absorption and total mass of the key body structure, the displacement of the roof, and the maximum angular velocity of the body’s center of mass. To address the multi-objective optimization problem of improving rollover crashworthiness while reducing mass, this paper combines the particle swarm optimization algorithm with the artificial immune algorithm. This hybrid algorithm converges rapidly, and the Pareto solution set exhibits superior uniformity and diversity. Finally, the shortest distance method is employed to identify the optimal design scheme that can enhance the rollover crashworthiness of vans and reduce the mass of body parts.

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“…The higher the SEA value, the better the rolling performance of the vehicle. The calculation formula for SEA [31] is as follows:…”

Section: Analysis Factors and Design Objectivesmentioning

confidence: 99%

Optimization of Rollover Crashworthiness and Vehicle Mass Based on Unreplicated Saturated Factorial Design

et al. 2023

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“…In 2009, Mihalef et al [38] used kinetic energy and surface energy to determine the generation of small-scale splash, which could simulate droplets and bubbles realistically. In 2016, Meric proposed to analyze the acceleration and curvature values to identify the fast and complicated water flows, and foam particle is advected by its classified type based on its velocity [39]. This paper is inspired by those methods mentioned above and a symmetric SPH-based simulation model for diffuse fluid is proposed.…”

Section: Related Workmentioning

confidence: 99%

A Symmetric Particle-Based Simulation Scheme towards Large Scale Diffuse Fluids

et al. 2018

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We present a symmetric particle simulation scheme for diffuse fluids based on the Lagrangian Smoothed Particle Hydrodynamics (SPH) model. In our method, the generation of diffuse particles is determined by the entropy of fluid particles, and it is calculated by the velocity difference and kinetic energy. Diffuse particles are generated near the qualified diffuse particle emitters whose diffuse material generation rate is greater than zero. Our method fits the laws of physics better, as it abandons the common practice of adding diffuse materials at the crest empirically. The coupling between diffuse materials and fluid is a post-processing step achieved by the velocity field, which enables the avoiding of the time-consuming process of cross finding neighbors. The influence weights of the fluid particles are assigned based on the degree of coupling. Therefore, it improved the accuracy of the diffuse particle position and made the simulation results more realistic. The approach is appropriate for large scale diffuse fluid, as it can be easily integrated in existing SPH simulation methods and the computational overhead is negligible.

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“…Since then, an enormous amount of contribution has been made to the related eld. Effect of tube geometry [1][2][3][4], material type [5,6], lling materials [7][8][9] widely investigated by researchers. Moreover, advances in the manufacturing processes and a growing interest in engineering optimization allowed researchers to study more complex geometries [10,11].…”

Section: Introductionmentioning

confidence: 99%

Coupled Effect of Thickness Optimization and Plastic Forming History on Crashworthiness Performance of Thin-Walled Square Tube

Sofuoğlu

Çam

2021

Preprint

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Thin-walled tubes are widely used as energy absorbers due to their high crashworthiness performance. This study aims to evaluate the effect of plastic forming history carried out for thickness optimization on crashworthiness performance of thin-walled square tube (TWST). Within the scope of the study, a series of numerical analyses were conducted for the TWST using a commercial finite element (FE) software. In order to determine individual effect of optimization, FG thickness of TWST was first obtained using LS-OPT software. Later, thickness gradient was achieved by performing rolling process to consider individual plastic forming effect Afterwards, deep drawing process was carried out to shape TWST by considering springback and trimming effects. Finally, crash responses were obtained under axial high velocity impact loading to determine the coupled effect of optimization and plastic forming on the crashworthiness performance of the TWST. It was determined that the coupled effect, which takes plastic forming and optimization effects into account, reduced the peak crush force of the TWST by 24% and increased the absorbed energy value by 39%. The results obtained from this study showed that coupled effect of optimization and plastic forming processes has significant effect on the crashworthiness performance of the TWST and otherwise either overestimated or underestimated results are obtained.

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Energy absorption behavior of tailor-welded tapered tubes under axial impact loading using coupled FEM/SPH method

Cited by 20 publications

References 33 publications

Optimization of Rollover Crashworthiness and Vehicle Mass Based on Unreplicated Saturated Factorial Design

Optimization of Rollover Crashworthiness and Vehicle Mass Based on Unreplicated Saturated Factorial Design

A Symmetric Particle-Based Simulation Scheme towards Large Scale Diffuse Fluids

Coupled Effect of Thickness Optimization and Plastic Forming History on Crashworthiness Performance of Thin-Walled Square Tube

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