Numerical study of the effects of shear deformation and superimposed hydrostatic pressure on the formability of AZ31B sheet at room temperature

Wang, H.; Wu, Peidong; Lee, S.Y.; Wang, J.; Neale, K.W.

doi:10.1016/j.ijmecsci.2014.12.002

Cited by 33 publications

(8 citation statements)

References 49 publications

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“…They found that the fatigue failure curve of rock salt was controlled by the complete stress-strain curve under static loading. Similar results have been obtained with rock of different densities, such as marble [10][11][12][13], granite [14,15], white sandstone [16], and coal rock [17] through fatigue testing. It was suggested that fatigue testing would be a feasible and effective method for damage evolution.…”

Section: Introductionsupporting

confidence: 81%

Nonlinear Fatigue Damage of Cracked Cement Paste after Grouting Enhancement

Wang

Guo

et al. 2018

Applied Sciences

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Grouting reinforcement is an important part of modern engineering and has grown in popularity due to the benefits of grouting enhancement on cyclic loading. Understanding the fatigue mechanism of grouting-enhanced structures is vital to the design and the long-term stability analysis of such structures. In this study, the fatigue mechanical properties of cracked cement paste after epoxy resin grouting enhancement under different cyclic conditions were investigated in the laboratory and an inverted S-shaped curve was proposed to describe the damage accumulation. The test results indicated that the fatigue axial deformation can be divided into three stages: the initial stage, constant velocity stage and accelerating stage. The irreversible deformation can be used to describe the damage accumulation. The fatigue process is significantly affected by the upper limit stress level and the stress amplitude. In addition, the exponential relationship between stress amplitude and fatigue life was obtained. The proposed S-shaped curve was validated by an experimental fatigue strain test.The tests result upon various load conditions and crack types represented a good agreement with the predicted data.

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Section: Introductionsupporting

confidence: 81%

Nonlinear Fatigue Damage of Cracked Cement Paste after Grouting Enhancement

Wang

Guo

et al. 2018

Applied Sciences

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“…From these literatures [12][13][14][15][16][17][18][19][20], it is concluded that the observed difference in biaxial and hemispherical dome test failure points in the present research can be explained by the pressurization effect that the punch has on the specimen during hemispherical dome forming. This effect is not present in specimens pulled on the biaxial machine, and, therefore, the ductility is not affected, and a lower formability and failure is seen.…”

Section: Resultsmentioning

confidence: 54%

“…The main difference in the hemispherical dome test as compared to the biaxial test is that the punch is in contact with the sheet metal, and it forces downward in order to deform the material by pressurizing the sheet surface. It is assumed that this difference is making the material deform more during the hemispherical dome tests than was found with the Some previous research [12][13][14][15][16][17][18][19][20] has observed that the application of pressure through the thickness direction can soften the material and increase its forming. As investigated in these literatures, the effect of pressurization on formability in sheet metals is a case that an effective softening of the material occurs to varying degrees, depending upon the amount of pressure that is applied to a given material through thickness direction.…”

Section: Resultsmentioning

confidence: 97%

“…This is an unwanted variable that can cause variations during testing and data collection [9][10][11]. Pressure is the other contact condition that can cause the sample to fail at higher forces or time because of how the pressure makes the material behave while under stress [12][13][14][15][16][17][18][19][20]. All referenced studies show that the through thickness normal stress influences the forming limit curve (FLC).…”

Section: Introductionmentioning

confidence: 99%

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Forming Limit Differences in Hemispherical Dome and Biaxial Test During Equibiaxial Tension on Cruciform

Nikhare

Vorisek

Nolan

et al. 2017

Journal of Engineering Materials and Technology

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Traditionally, the mechanical properties of materials have been characterized using the uniaxial tension test. This test is considered adequate for simple forming operations where single axis loading is dominant. Previous studies, however, have noted that the data acquired from this type of testing are not enough and additional details in other axes under simultaneous deformation conditions are important. To analyze the biaxial strain, some studies have suggested using the limiting dome height test and bulge test. However, these tests limit the extent of using multi-axial loading and the resulting stress pattern due to contact surfaces. Therefore, researchers devised the biaxial machine which is designed specifically to provide biaxial stress components using multiple and varying loading conditions. The idea of this work is to evaluate the relationship between the dome test data and the biaxial test data. For this comparison, cruciform specimens with a diamond shaped thinner gage in the center were deformed with biaxial stretching on the biaxial testing machine. In addition, the cruciform specimens were biaxially stretched with a hemispherical punch in a conventional die-punch setting. Furthermore, in each case, the process was simulated using a three-dimensional (3D) model generated on abaqus. These models were then compared with the experimental results. The forces on each arm, strain path, forming, and formability were analyzed. The differences between the processes were detailed. It was found that biaxial tests eliminated the pressurization effect which could be found in hemispherical dome tests.

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“…This is an unwanted variable that can cause variations in testing and data collection [25][26][27]. Pressure is the other contact condition that can cause the sample to fail at higher forces or time because of how the pressure makes the material behave while under stress [28][29][30][31][32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Forming Limit Differences in Biaxial and Dome Test

Nikhare

2018

Journal of Manufacturing Science and Engineering

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For centuries, metals and materials have been characterized using a traditional method called a uniaxial tension test. The data acquired from this test found to be adequate for operations of simple forming where one axis stretching is dominant. Currently, due to the demand of lightweight component production, multiple individual parts eliminated by stamping a single complex shape, which also further reduces many secondary operations. This change is driving by the new fuel-efficiency requirement by corporate average fuel economy of 55.8 miles per gallon by 2025.1 Due to complex part geometry, this forming method induces multiaxial stress states, which are difficult to predict using conventional tools. Thus, to analyze these multiaxial stress states limiting dome height tests and bulge tests were recommended in many research publications. However, these tests limit the possibilities of applying multiaxial loading and rather a sample geometry changes are required to imply multiaxial stresses. Even this capability is not an option in bulge test due to leakage issue. Thus, a test machine called a biaxial test was devised that would provide the capability to test the specimen in multiaxial stress states by varying the independent load or displacement on two independent axis. In this paper, two processes, limiting dome tests and biaxial tests were experimented, modeled, and compared. For the biaxial tests, a cruciform test specimen was utilized, and conventional forming limit specimens were used for the dome tests. Variation of sample geometry in limiting dome test and variation of loading in biaxial test were utilized to imply multiaxial stress states in order to capture the limit strain from uniaxial to equibiaxial strain mode. In addition, the strain path, forming, and formability investigated and the differences between the tests provided. From the results, it was noted that higher limit strains were acquired in dome tests than in biaxial tests due to contact pressure from the rigid punch. The literature shows that the contact pressure (which occurs when the rigid tool contacts the deformed body), increases the deformation and thus increases the limit strains to failure. This contact pressure parameter is unavailable in biaxial test, and thus, a pure material behavior can be obtained. However, limit strains from biaxial test cannot be considered for a process where rigid tool is processing the metal, and thus, calibration is necessary.

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Numerical study of the effects of shear deformation and superimposed hydrostatic pressure on the formability of AZ31B sheet at room temperature

Cited by 33 publications

References 49 publications

Nonlinear Fatigue Damage of Cracked Cement Paste after Grouting Enhancement

Nonlinear Fatigue Damage of Cracked Cement Paste after Grouting Enhancement

Forming Limit Differences in Hemispherical Dome and Biaxial Test During Equibiaxial Tension on Cruciform

Experimental and Numerical Investigation of Forming Limit Differences in Biaxial and Dome Test

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