Vehicle Body Structure Durability Analysis

Kuo, E. Y.; Kelkar, Subhash G.

doi:10.4271/951096

“…The main idea is to counteract the unbalanced applied loads by a set of rigid body accelerations, the latter providing body forces which are distributed over the structure in such a way that the applied forces are equilibrated and the static analysis can be performed. The technique is available into most of the commercial finite element (FE) packages and it has been widely used by the industry in different fields 2‐10 …”

Section: Introductionmentioning

confidence: 99%

“…The technique is available into most of the commercial finite element (FE) packages and it has been widely used by the industry in different fields. [2][3][4][5][6][7][8][9][10] The static global stiffness analysis of a body in white (BIW) is a common example that involves the computational simulation of an unconstrained configuration using the IR method. The BIW global stiffness plays a significant role in the design process of a car.…”

mentioning

confidence: 99%

Nonintrusive reduced order model for parametric solutions of inertia relief problems

Cavaliere

¹

,

Zlotnik

²

,

Sevilla

³

et al. 2021

Numerical Meth Engineering

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The Inertia Relief (IR) technique is widely used by industry and produces equilibrated loads allowing to analyze unconstrained systems without resorting to the more expensive full dynamic analysis. The main goal of this work is to develop a computational framework for the solution of unconstrained parametric structural problems with IR and the Proper Generalized Decomposition (PGD) method. First, the IR method is formulated in a parametric setting for both material and geometric parameters. A reduced order model using the encapsulated PGD suite is then developed to solve the parametric IR problem, circumventing the so-called curse of dimensionality. With just one offline computation, the proposed PGD-IR scheme provides a computational vademecum that contains all the possible solutions for a predefined range of the parameters. The proposed approach is nonintrusive and it is therefore possible to be integrated with commercial finite element (FE) packages. The applicability and potential of the developed technique is shown using a three-dimensional test case and a more complex industrial test case. The first example is used to highlight the numerical properties of the scheme, whereas the second example demonstrates the potential in a more complex setting and it shows the possibility to integrate the proposed framework within a commercial FE package. In addition, the last example shows the possibility to use the generalized solution in a multi-objective optimization setting. K E Y W O R D Sinertia relief, nonintrusive, proper generalized decomposition, reduced order model, shape optimization INTRODUCTIONUnconstrained structures are widespread in the automotive, aerospace and naval industry. As is well known, due to the singularity of the stiffness matrix, conventional static analyses cannot be performed if the system undergoes rigid body motions. At the same time, imposing dummy constraints in order to make a free-body system statically determinate leadsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The main idea is to counteract the unbalanced applied loads by a set of rigid body accelerations, the latter providing body forces which are distributed over the structure in such a way that the applied forces are equilibrated and the static analysis can be performed. The technique is available into most of the commercial finite element packages and it has been widely used by the industry in different fields [2,3,4,5,6,7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Nonintrusive reduced order model for parametric solutions of inertia relief problems

Cavaliere

¹

,

Zlotnik

²

,

Sevilla

³

et al. 2020

Preprint

0

View full text Add to dashboard Cite

The Inertia Relief (IR) technique is widely used by industry and produces equilibrated loads allowing to analyze unconstrained systems without resorting to the more expensive full dynamic analysis. The main goal of this work is to develop a computational framework for the solution of unconstrained parametric structural problems with IR and the Proper Generalized Decomposition (PGD) method. First, the IR method is formulated in a parametric setting for both material and geometric parameters. A reduced order model using the encapsulated PGD suite is then developed to solve the parametric IR problem, circumventing the so-called curse of dimensionality. With just one offline computation, the proposed PGD-IR scheme provides a computational vademecum that contains all the possible solutions for a pre-defined range of the parameters. The proposed approach is nonintrusive and it is therefore possible to be integrated with commercial FE packages. The applicability and potential of the developed technique is shown using a three dimensional test case and a more complex industrial test case. The first example is used to highlight the numerical properties of the scheme, whereas the second example demonstrates the potential in a more complex setting and it shows the possibility to integrate the proposed framework within a commercial FE package. In addition, the last example shows the possibility to use the generalized solution in a multi-objective optimization setting.

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“…Fatigue failure of the autobody is mainly due to stochastic vibration of the structure subjected to random excitation from the road. Fatigue analysis of the whole body is necessary for achieving accurate life results, and the boundary conditions used in the analysis need to be applied according to fatigue tests of components [2]. Palma and Vidal [3] investigated the equivalent relationship between the load conditions in practical running and in torsion fatigue tests of components.…”

Section: Introductionmentioning

confidence: 99%

Fatigue life analysis of the autobody in a sports utility vehicle and its improvement using the homogenization method

Zhu

¹

,

He

²

,

Jin

³

2008

Proceedings of the Institution of Mechanical Engineers, Part D:

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Fatigue life analysis and improvement of the autobody in a sports utility vehicle (SUV) were performed. The stress distribution under unit displacement excitation was obtained by the finite element (FE) method. A bilateral track model was adopted to obtain load spectra in accordance with the vehicle reliability test. The total life of the autobody was evaluated by the nominal stress method with the assumption of a uniaxial stress state, and thus the critical regions were determined. The life of components with critical regions was further investigated on the basis of multiaxial fatigue theory. The results show that some components near to the suspension are easy to damage because they are directly subjected to impact loading from the road. It is also indicated that the result from multiaxial fatigue analysis is more reasonable than that from the nominal stress method, which was verified by experimental results. Finally, topological optimization of the spot weld location in the critical region was carried out by the homogenization method to improve its fatigue life.

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Vehicle Body Structure Durability Analysis

Cited by 19 publications

References 3 publications

Nonintrusive reduced order model for parametric solutions of inertia relief problems

Nonintrusive reduced order model for parametric solutions of inertia relief problems

Nonintrusive reduced order model for parametric solutions of inertia relief problems

Fatigue life analysis of the autobody in a sports utility vehicle and its improvement using the homogenization method

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