Stress Singularity Issues on Finite Element Models of Powertrain Parts

Souza, Thales Sardinha Garcia; Souza, Mauro Moraes de; Savoy, Juliano; Coelho, Carlos

doi:10.4271/2011-36-0158

Cited by 3 publications

(6 citation statements)

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“…This singularity value was determined by comparison with the tensile values measured in adjacent nodes and by experience. In the study by Souza et al, 33 this ratio was set at 30% for singularity. 20 However, in this study, the ANSYS Software Maintenance Services Unit suggested that this rate should be made smaller (ANSYS Support Service).…”

Section: Resultsmentioning

confidence: 99%

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Strength-based design of a fertilizer spreader chassis using computer aided engineering and experimental validation

İrsel

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this research, stress measurement tests and advanced application algorithms based on computer-aided design and engineering (CAD and CAE) were developed and tested. The algorithm was put implemented through a case study on the strength-based structural design and fatigue analysis of a chassis. This algorithm consists of numerical and experimental methods and additionally includes material tests, three-dimensional CAD, a finite element method (FEM)-based analysis procedures, a structural optimization strategy, prototype production, stress tests, a fatigue analysis, and design verification procedures. In the optimization study targeting the optimum chassis weight/strength ratio, two chassis prototypes, with 8 mm and a 5 mm wall thicknesses, were manufactured to verify the structural analysis and experimental tests. As a result of the FEA analyses, for 20 kN, which is the target load value of the chassis, for chassis thicknesses t = 5 mm and t = 8 mm, the maximum tensile strength was obtained as 93 MPa and 83 MPa, respectively. Thus, the material gain of 35.85 kg mass was achieved, and chassis utilization efficiency was increased. This research provides a useful methodology for experimental and advanced CAE techniques, especially for further research on complex stress and deformation analysis of chassis that are desired to be of optimum weight/strength ratio.

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Section: Resultsmentioning

confidence: 99%

“…28 The singularity can be calculated in an FEA solution on a critical element that experiences extremely high-stress amounts at a critical location. 5,20,33 Force flows are restraints that are not realistically defined. This type of singular spots can typically not be avoided in practice.…”

Section: Cad Modeling and Finite Element Analysismentioning

confidence: 99%

Strength-based design of a fertilizer spreader chassis using computer aided engineering and experimental validation

İrsel

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The maximum stress occurs at the sharp corner. 34 Here, the stress values measured with the probe on two consecutive nodes are 225.42 and 88.36 MPa, respectively. According to further investigations, the stress values are extremely high, and the results are not proportional to the defined loading conditions and calculated displacements.…”

Section: Finite Element Method-based Stress Analysis and Fem Model Controlmentioning

confidence: 99%

Strength-based design of a sunflower stalk cutter machine design using finite element analysis and experimental validation

İrsel

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this study, the total algorithm of the strength-based design of the system for mass production has been developed. The proposed algorithm, which includes numerical, analytical, and experimental studies, was implemented through a case study on the strength-based structural design and fatigue analysis of a tractor-mounted sunflower stalk cutting machine (SSCM). The proposed algorithm consists of a systematic engineering approach, material selection and testing, design of the mass criteria suitability, structural stress analysis, computer-aided engineering (CAE), prototype production, experimental validation studies, fatigue calculation based on an FE model and experimental studies (CAE-based fatigue analysis), and an optimization process aimed at minimum weight. Approximately 85% of the system was designed using standard commercially available cross-section beams and elements using the proposed algorithm. The prototype was produced, and an HBM data acquisition system was used to collect the strain gage output. The prototype produced was successful in terms of functionality. Two- and three-dimensional mixed models were used in the structural analysis solution. The structural stress analysis and experimental results with a strain gage were 94.48% compatible in this study. It was determined using nCode DesignLife software that fatigue damage did not occur in the system using the finite element analysis (FEA) and experimental data. The SSCM design adopted a multi-objective genetic algorithm (MOGA) methodology for optimization with ANSYS. With the optimization solved from 422 iterations, a maximum stress value of 57.65 MPa was determined, and a 97.72 kg material was saved compared to the prototype. This study provides a useful methodology for experimental and advanced CAE techniques, especially for further study on complex stress, strain, and fatigue analysis of new systematic designs desired to have an optimum weight to strength ratio.

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“…The singularity can be diagnosed if the relative difference between stress values measured at two corner points on an identified single element is greater than 30%. In this scenario, the excessive stress values on related locations can be ignored (Souza et al 2011).…”

Section: Cad Modelling and Finite Element Analysismentioning

confidence: 99%

“…A stress singularity case in the FEA of the Para-Plow tool was explored in accordance with related scientific literature (Huebner et al 2001;Andy's Log 2012;Coskun and Soyhan 2011, SolidWorks Doc. 2011, Souza et al 2011. The singularity control showed that cases on some elements (specifically on two elements: tine connection plates and a welding point on the main frame) in the FEA of the Para-Plow was diagnosed and these values were ignored in the evaluation of the stress analysis results.…”

Section: Cad Modelling and Finite Element Analysismentioning

confidence: 99%

Strength-based design analysis of a Para-Plow tillage tool

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Topakçı

et al. 2020

Computers and Electronics in Agriculture

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In this research, experimental field tests and an advanced computer aided design and engineering (CAD and CAE) based application algorithm was developed and tested. The algorithm was put into practice through a case study on the strength-based structural design analysis of a Para-Plow tillage tool. Para-Plow is an effective tractor attached tillage tool utilised as an alternative to the conventional deep tillage tools used in agricultural tillage operations. During heavy tillage operations, the Para-Plow experiences highly dynamic soil reaction forces which may cause undesired deformations and functional failures on its structural elements. Here, prediction of the deformation behaviour of the tool structure during tillage operation in order to describe optimum structural design parameters for the tool elements and produce a functionally durable tool become an important issue. In the field experiments, draft force and strain-gauge based measurements on the tool were carried out simultaneously. Subsequently, Finite Element Method based stress analysis (FEA) were employed in order to simulate deformation behaviour of the tool under consideration of the maximum loading (worst-case scenario) conditions tested in the field. In the field experiments, average and maximum resultant draft forces were measured as 33,514 N and 51,716 N respectively. The FEA revealed that the maximum deformation value of the tool was 9.768 mm and the maximum stress values impart a change on the most critical structural elements of between 50 and 150 MPa under a worst-case loading scenario. Additionally, a validation study revealed that minimum and maximum relative differences for the equivalent stress values between experimental and simulation results were 5.17 % and 30.19 % respectively. This indicated that the results obtained from both the experimental and simulation are reasonably in union and there were no signs of plastic deformation on the Para-Plow elements (according to the material yield point) under pre-defined loading conditions and a structural optimisation on some of the structural elements may also be possible.This research provides a useful strategy for informing further research on complicated stress and deformation analyses of related agricultural equipment and machinery through experimental and advanced CAE techniques.

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Stress Singularity Issues on Finite Element Models of Powertrain Parts

Cited by 3 publications

References 1 publication

Strength-based design of a fertilizer spreader chassis using computer aided engineering and experimental validation

Strength-based design of a fertilizer spreader chassis using computer aided engineering and experimental validation

Strength-based design of a sunflower stalk cutter machine design using finite element analysis and experimental validation

Strength-based design analysis of a Para-Plow tillage tool

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