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Journal ArticleDOI

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

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 ArticleDOI
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 ArticleDOI
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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Journal ArticleDOI
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

References
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BookDOI
01 Jan 2000

288 citations


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

  • ...Hill 48 yield criterion with isotropic hardening is commonly used for modelling the sheet metal forming process.(100) The finite element results of an automotive bumper simulated assuming Hill 48 yield criterion and isotropic hardening is compared with the experimental results in Figure 10....

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Journal ArticleDOI
TL;DR: In this paper, a new yield criterion was constructed by adding a particular pair of cubic terms to the author's 1948 quadratic, and the numerical parameters were kept to a minimum and must be determined readily from data given by standard tests.

277 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a 3D model for the numerical simulation of the deep-drawing process taking into account the large elastoplastic strains and rotations that occur in the deep drawing process.

248 citations


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

  • ...The deforming blank is generally modelled using two-dimensional (2D) quadrilateral shell elements, though attempts on using three-dimensional (3D) elements have also been made.(93) While using shell elements for sheet metal forming, the variation of Figure 8....

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Journal ArticleDOI
TL;DR: In this article, an anisotropic plane stress yield function based on interpolation by second order Bezier curves is proposed, which can be used to describe, e.g., the yield stress and R-value as a function of the loading direction more accurately than with other common analytical yield functions.

238 citations

Journal ArticleDOI
Manabu Gotoh1
TL;DR: In this article, a yield function of fourth order for commercial Al-killed steel and Cu-(1 4 )-H sheets is presented and compared with the conventional quadratic yield function for planar isotropy.

233 citations