Investigation of evolving yield surfaces of dual-phase steels

Hou, Yong; Min, Junying; Guo, Ningning; Lin, Jianping; Stoughton, Thomas B.; Traphöner, Heinrich; Clausmeyer, Till; Tekkaya, A. Erman

doi:10.1016/j.jmatprotec.2019.116314

Cited by 58 publications

(17 citation statements)

References 43 publications

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“…An assembly of the anti-buckling support fixture, universal testing machine and DIC system, as shown in figure 1a, was used for the UC testing. Two solid flat plates were used to prevent buckling of specimen (see figure 1b), and the uniform compression deformation of thin (1.0~2.0 mm) sheet metals were successfully achieved by this design [4,[13][14][15]. Note that the strain field was measured optically by DIC techniques on one of the edge surfaces of the specimen.…”

Section: Development Of Compression Test For Ultra-thin Metallic Sheetmentioning

confidence: 99%

Plastic deformation of ultra-thin pure titanium sheet subject to tension-compression loadings

Hou

Zhang

Min

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Measurement of the Bauschinger effect of ultra-thin metallic sheet by the conventional tension-compression (TC) test is challenging due to the premature buckling during compression. In this study, a test method based on a multi-layered sandwich specimen is newly introduced to suppress the buckling in the uniaxial compression. Theoretical calibration is conducted for obtaining accurate flow stress under compression by correcting the effects of adhesive and friction induced by supporting side plates. Also, strains during the TC tests are measured by the digital image correlation (DIC) technique. From the proposed TC test with the sandwich specimen, plastic deformation of 0.1-mm-thick ultra-thin pure titanium sheet was investigated under reverse loading. Finally, the constitutive model based on the distortional hardening concept is newly developed and calibrated to reproduce the Bauschinger effect of the investigated ultra-thin sheet subject to TC loadings.

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Section: Development Of Compression Test For Ultra-thin Metallic Sheetmentioning

confidence: 99%

Plastic deformation of ultra-thin pure titanium sheet subject to tension-compression loadings

Hou

Zhang

Min

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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“…To acquire a sufficient number of data as input, the thickness and material properties (K and n parameters in the Hollomon hardening law) of the bottom sheet were varied and then used for simulations. Six material properties with various K and n values were created for the bottom materials of SPR joints as listed in Table 5 and used for FE (3) model to acquire the cross-tension strengths. Only three kinds of thicknesses were selected for M3-M6 materials since the required amount of data has been achieved.…”

Section: Data Set Of the Xgboost Regression Modelmentioning

confidence: 99%

“…An effective method for lightweight is using high strength steel and aluminium alloy as materials of automobile parts [ [1]]. There are several researches on the development of lightweight materials [ [2]], advanced material testing [ [3]], accurate simulation of forming process [ [4]], and so on. With regard to the mechanical joining process of high strength steels and aluminium alloys, self-piercing riveting (SPR) is a suitable method [ [5]] due to the advantages of environmental friendliness, high joint strength and stiffness [ [6]], easy access to visually inspect the joints and possibility of manual application [ [7]].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Cross-Tension Strength of Self-Piercing Riveted Joints Using Finite Element Simulation and XGBoost Algorithm

Lin

Wan

et al. 2021

Chin. J. Mech. Eng.

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Self-piercing riveting (SPR) has been widely used in automobile industry, and the strength prediction of SPR joints always attracts the attention of researchers. In this work, a prediction method of the cross-tension strength of SPR joints was proposed on the basis of finite element (FE) simulation and extreme gradient boosting decision tree (XGBoost) algorithm. An FE model of SPR process was established to simulate the plastic deformations of rivet and substrate materials and verified in terms of cross-sectional dimensions of SPR joints. The residual mechanical field from SPR process simulation was imported into a 2D FE model for the cross-tension testing simulation of SPR joints, and cross-tension strengths from FE simulation show a good consistence with the experiment result. Based on the verified FE model, the mechanical properties and thickness of substrate materials were varied and then used for FE simulation to obtain cross-tension strengths of a number of SPR joints, which were used to train the regression model based on the XGBoost algorithm in order to achieve prediction for cross-tension strength of SPR joints. Results show that the cross-tension strengths of SPR steel/aluminum joints could be successfully predicted by the XGBoost regression model with a respective error less than 7.6% compared to experimental values.

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“…An arm strengthening method via laser deposition using materials compatible with the test material was developed by Hou et al [27]. This method was verified using various materials to significantly enlarge the obtainable maximum plastic strain in the gage of cruciforms of aluminum alloy AA5754-O [28], dual-phase steels (e.g., DP590, DP780 and DP980) [29] and quenching and partitioning steel QP980 [30,31].…”

Section: Experimental Yield Locimentioning

confidence: 99%

Investigation on Yield Behavior of 7075-T6 Aluminum Alloy at Elevated Temperatures

Lin

Bao

Hou

et al. 2020

Chin. J. Mech. Eng.

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Aluminum alloys have drawn considerable attention in the area of automotive lightweight. High strength aluminum alloys are usually deformed at elevated temperatures due to their poor formability at room temperature. In this work, the yield behavior of 7075 aluminum alloy in T6 temper (AA7075-T6) within the temperature ranging from 25 °C to 230 °C was investigated. Uniaxial and biaxial tensile tests with the aid of induction heating system were performed to determine the stress vs. strain curves and the yield loci of AA7075-T6 at elevated temperatures, respectively. Von Mises, Hill48 and Yld2000-2d yield criteria were applied to predicting yield loci which were compared with experimentally measured yield loci of the AA7075-T6. Results show that yield stress corresponding to the same equivalent plastic strain decreases with increasing temperature within the investigated temperature range and the shape of yield loci evolves nearly negligibly. The experimental yield locus expands with an increase of equivalent plastic strain at the same temperature and the work hardening rate of AA7075-T6 exhibits obvious stress-state-dependency. The non-quadratic Yld2000-2d yield criterion describes the yield surfaces of AA7075-T6 more accurately than the quadratic von Mises and Hill48 yield criteria, and an exponent of 14 in the Yld2000-2d yield function gives the optimal predictions for the AA7075-T6 at all investigated temperatures.

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Investigation of evolving yield surfaces of dual-phase steels

Cited by 58 publications

References 43 publications

Plastic deformation of ultra-thin pure titanium sheet subject to tension-compression loadings

Plastic deformation of ultra-thin pure titanium sheet subject to tension-compression loadings

Prediction of Cross-Tension Strength of Self-Piercing Riveted Joints Using Finite Element Simulation and XGBoost Algorithm

Investigation on Yield Behavior of 7075-T6 Aluminum Alloy at Elevated Temperatures

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