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Journal Article•DOI•

Integrating effect of forming in fatigue life prediction: review of present scenario and challenges

Krishnaswamy Hariharan1, Krishnaswamy Hariharan2, Raghu V. Prakash1•
Indian Institute of Technology Madras1, Ashok Leyland2
22 Feb 2012-Vol. 226, Iss: 6, pp 967-979
TL;DR: In this article, the residual stresses of sheet metal deformation during forming induces complex residual stresses in the component owing to its geometry and material anisotropy, which affect the durability of the component.
Abstract: Plastic deformation of sheet metals during forming induces complex residual stresses in the component owing to its geometry and material anisotropy. The residual stresses affect the durability of t...
Citations
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Journal Article•DOI•
Ball-burnishing effect on deep residual stress on AISI 1038 and AA2017-T4

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A. A. Garcia-Granada, Giovanni Gómez-Gras, Ramón Jerez-Mesa1, J. Antonio Travieso-Rodriguez1, Guillermo Reyes •
Polytechnic University of Catalonia1
12 Apr 2017-Materials and Manufacturing Processes
TL;DR: In this article, the incremental hole drilling (IHD) technique is tested to measure residual stresses, being able to reach a 2-mm measuring depth, and a commercial strain gage is used and calibrated using finite element model simulations.
Abstract: Ball-burnishing induces compressive residual stresses on treated materials by the effect of plastic deformation. The result is an increase in the fatigue life of the treated part, retarding the initiation of cracks on the surface. Compressive residual stresses have been previously measured by X-ray diffraction near the surface, revealing considerably high values at the maximum analyzed depth, in relation to other finishing processes such as shot peening. However, the maximum analyzed depth is very limited by using this technique. In this paper, the incremental hole drilling (IHD) technique is tested to measure residual stresses, being able to reach a 2-mm measuring depth. To that objective, a commercial strain gage is used and calibrated using finite element model simulations. A second Finite Element Model based on material removal rate is developed to obtain the equations to calculate the strain release through IHD. Finally, residual stresses are measured experimentally with that technique on two...

35 citations

Cites background from "Integrating effect of forming in fa..."

  • ...) [7], and a longer lifespan of industrial components can be expected, as explained by Hariharan and Prakash [8]....

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  • ...[7], and a longer lifespan of industrial components can be expected, as explained by Hariharan and Prakash [8]....

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Journal Article•DOI•
Determination of Anisotropic Yield Coefficients by a Data-Driven Multiobjective Evolutionary and Genetic Algorithm

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Krishnaswamy Hariharan1, Ngoc-Trung Nguyen1, Nirupam Chakraborti2, Frédéric Barlat2, Myoung-Gyu Lee3 •
Indian Institute of Technology Delhi1, Pohang University of Science and Technology2, Korea University3
13 Feb 2015-Materials and Manufacturing Processes
TL;DR: In this article, a robust multiobjective optimization based on evolutionary algorithm is proposed to minimize the error in yield stress and plastic strain ratio simultaneously and thereby overcomes the limitations in the approaches used before.
Abstract: The texture induced anisotropy of yield strength in cold rolled sheet metals is modeled using anisotropic yield criteria. The classical and other optimization methods used so far to determine the yield coefficients are limited by fixed set of experimental data, initial guess values, and pre-determined weight factors. A robust multiobjective optimization based on evolutionary algorithm proposed in this paper minimizes the error in yield stress and plastic strain ratio simultaneously and thereby overcomes the limitations in the approaches used before. The new approach is tested using Hill48 and Barlat89 yield criteria for five different materials from literature. The new approach is observed to improve the prediction capability of yield coefficients when compared to earlier approaches. The Pareto frontier obtained in the new approach can serve as a comparative tool to evaluate the accuracy of different yield criteria.

19 citations

Cites background from "Integrating effect of forming in fa..."

  • ...The complex mechanical behavior of different materials [5] and the demand for accurate modeling of forming process [2, 6, 7] have led to the development of several advanced yield functions [1, 8– 10]....

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  • ...Assuming orthotropic symmetry, several phenomenological models have been proposed in the past to describe the anisotropy of yield strength [1, 2]....

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Book Chapter•DOI•
Metal Forming Analysis: Finite Elements for Large Deformation

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R. H. Wagoner, J.-L. Chenot
01 Jan 2001

17 citations

Journal Article•DOI•
Influence of uniaxial and biaxial pre-straining on the high cycle fatigue performance of DP590 steel

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Puja Ghosal1, Abhishek Raj2, Surajit Kumar Paul1•
Indian Institute of Technology Patna1, Tata Steel2
01 Aug 2021-International Journal of Fatigue
TL;DR: In this paper, the authors assess tensile and high cycle fatigue performance of dual-phase (DP590) steel subjected to uniaxial and equi-biaxial pre-strain.

15 citations

Journal Article•DOI•
Fatigue life evaluation of tension‐compression asymmetric material using local stress–strain method

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Jiwei Chen1, Weixing Yao1, Daiyang Gao1•
Nanjing University of Aeronautics and Astronautics1
01 Sep 2020-Fatigue & Fracture of Engineering Materials & Structures

8 citations

References
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Journal Article•DOI•
Material optimization: A case study using sheet metal-forming analysis

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Krishnaswamy Hariharan1, C. Balaji1•
Ashok Leyland1
01 Jan 2009-Journal of Materials Processing Technology
TL;DR: In this paper, the sheet metal-forming process is analyzed using a commercial explicit solver, and a CAD model of the tool geometry is developed by scanning the die in coordinate measuring machine (CMM).

23 citations

"Integrating effect of forming in fa..." refers methods in this paper

  • ...The finite element method is an useful technique to understand the material behaviour and residual stress induced during complex large deformation plasticity problems like sheet metal forming.(83,84) Though the underlying fundamental plasticity relations were developed as early as the mid-twentieth century, finite element modelling of the sheet metal forming process using plasticity relations began after the 1970s....

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Journal Article•DOI•
A study of techniques in the evaluation of springback and residual stress in hydroforming

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C. Bruni, M. Celeghini1, Manfred Geiger1, F. Gabrielli•
University of Erlangen-Nuremberg1
15 Jun 2007-The International Journal of Advanced Manufacturing Technology
TL;DR: In this paper, the effect of pressure, die insert geometry and friction at the blank holder on springback and residual stresses have been analyzed and discussed in detail using a 3D coordinate measuring machine using a new proposed method based on the standard deviation calculation.
Abstract: The increasing need for high strength complex hollow bodies for automotive application is pushing towards the use of sheet hydroforming techniques in conjunction with high strength steels. Unfortunately high strength steels are characterised by high springback levels. In this paper the springback and residual stresses have been analysed by means of laboratory trials carried out using the double sheet hydroforming technique. The attention has been focused on the upper blank of TRIP800 steel. The analysis has been performed using different approaches: i) characterisation of sample accuracy by means of a 3D coordinate measuring machine using a new proposed method based on the standard deviation calculation; ii) FE-analysis of both hydroforming and springback stages using an implicit FEM code; iii) residual stress evaluation by means of X-ray diffraction and laser cutting techniques. The effect of pressure, die insert geometry and friction at the blank holder on springback and residual stresses have been analysed and discussed in detail.

22 citations

Journal Article•DOI•
Influence of the plasticity model in sheet metal forming simulations

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Luciano Pessanha Moreira1, Gérard Ferron2•
Federal Fluminense University1, Metz2
30 Nov 2004-Journal of Materials Processing Technology
TL;DR: In this article, the influence of the plasticity model adopted in sheet metal forming simulations is investigated by means of a numerical study of three types of experimental tests, namely, the hemispherical punch stretching, the cup-drawing and a bending drawing test, and it is shown that numerical predictions of strain distributions mainly depend on the yield surface shape in the stress range of interest.

20 citations

"Integrating effect of forming in fa..." refers background or methods in this paper

  • ...However, the isotropic hardening is not suitable for modelling subsequent forming stages and spring back, which involves reversal of load path.(99)...

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  • ...Since forming process modelling involves monotonic loading without any intermittent load reversal, assuming isotropic hardening behaviour does not affect the accuracy of the prediction significantly.(99) Hill 48 yield criterion with isotropic hardening is commonly used for modelling the sheet metal forming process....

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Journal Article•DOI•
Study on multi-stage sheet metal forming for automobile structure-pieces

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Wei Chen1, Z.J. Liu2, Bo Hou1, Ruxu Du2•
Jiangsu University1, The Chinese University of Hong Kong2
12 Jun 2007-Journal of Materials Processing Technology
TL;DR: In this paper, the forming characteristics of left-rear hanger are analyzed firstly and two-stage drawing pattern is adopted, then four kinds of schemes are used to research the influence of different drawn patterns and deformed amount on the forming quality of subsequent drawing.

20 citations

"Integrating effect of forming in fa..." refers background in this paper

  • ...The sheet metal components are subjected to different strain paths during multistage deformation.(118) However, the present methodologies of strain-based evaluation are highly sensitive to strain path(119) and hence it is difficult to determine the final stress state of the component....

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Journal Article•DOI•
Metallurgical Factors Affecting the Formability of Cold-rolled High Strength Steel Sheets

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Toshio Irie1, Susumu Satoh1, Koichi Hashiguchi1, Isao Takahashi1, Osamu Hashimoto1 •
Kawasaki Steel Corporation1
01 Jan 1981-Isij International
TL;DR: In this paper, the metallurgical factors affecting the press formability of cold rolled high strength steels are discussed and the properties of the following 40 kgf/mm2 class tensile strength STEels are examined: dual phase steel consisting of a ferrite-martensite structure.
Abstract: The metallurgical factors affecting the press formability of cold rolled high strength steels are discussed and the properties of the following 40 kgf/mm2 class tensile strength steels are examined: dual phase steel consisting of a ferrite-martensite structure, produced by rapid cooling in a continuous annealing line, which has a very low yield to tensile strength ratio and high n-value; rephosphorized steel, which is a batch-annealed aluminum-killed steel hardened with phosphorus and manganese, having a high r-value and a relatively low yield strength; and a recently developed steel of extra deep drawing quality and high strength which is characterized by its extremely high r-value, over 2.0, and low yield strength. This can be produced by continuous annealing of niobium-stabilized, extra low carbon, phosphorus-bearing steel. The formability and brittleness of the steels are also examined.

20 citations

"Integrating effect of forming in fa..." refers background in this paper

  • ...The alloy composition controls the formation of unfavourable precipitates; for example, excess titanium precipitates with sulphur and oxygen to form inclusions.(4,5) The inclusions can affect the plastic deformation during forming and further fatigue behaviour....

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Vadym Stupnytskyy, Ihor Hrytsay
Residual Stress State in Tools Used for Thermo-mechanical Metal Forming Processes

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