Hydroforming Limits in Metal Bellows Forming Process

Faraji, Gh.; Hashemi, Ramin; Mashhadi, Mahmoud Mosavi; Dizaji, Ahmad F.; Norouzifard, Vahid

doi:10.1080/10426914.2010.499579

Cited by 34 publications

(10 citation statements)

References 16 publications

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“…Many new manufacturing processes, such as hydroforming [1][2][3], laser forming [4], water jet forming [5], and incremental forming [6][7][8][9][10], were introduced in the last decade. However, owing to high flexibility, the single-point incremental forming (SPIF) process has attained a great attention.…”

Section: Introductionmentioning

confidence: 99%

Guidelines for Tool-Size Selection for Single-Point Incremental Forming of an Aerospace Alloy

Hussain

Khan²,

Lin

et al. 2013

Materials and Manufacturing Processes

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Single-point incremental forming (SPIF) is relatively a novel sheet forming process to produce small lots with low cost. In this article, guidelines for tool size selection for SPIF of an aerospace grade alloy (AA-2024) are presented. The role of tool size, with respect to sheet thickness employed, on the formability in SPIF (i.e., spifability) is clarified. The response surface method is employed in order to study the significance of sheet thickness (t o ) and tool radius (r) on the spifability. The results of analysis of variance (ANOVA) show that the sheet thickness and tool radius are not significant individually, however, a strong interaction between these parameters exists. Moreover, for a particular sheet thickness, there exists only one r=t o value at which the spifability can be maximized under a given set of conditions. Furthermore, for a given sheet thickness, if a tool with radius lesser than a particular value is used (i.e., r=t o < 2) the material squeezes out from the tool=sheet interface. And, such a condition adversely affects the material spifability. FEA using LS-DYNA has also been carried out.

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Section: Introductionmentioning

confidence: 99%

Guidelines for Tool-Size Selection for Single-Point Incremental Forming of an Aerospace Alloy

Hussain

Khan²,

Lin

et al. 2013

Materials and Manufacturing Processes

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show abstract

“…Eq. (13) is used to calibrate the FLCs of ST12 low carbon steel and for the other materials used in this study; the imperfection factor f 0 was used as a factor for calibration (e.g., see [13,14,21]). Then the effects of the through-thickness compressive normal stress and strain path changes on the extended stress-based FLC were investigated theoretically.…”

Section: Resultsmentioning

confidence: 99%

Analysis of the extended stress-based forming limit curve considering the effects of strain path and through-thickness normal stress

Hashemi

Abrinia

2014

Materials & Design (1980-2015)

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In this study, an approach based on the modified Marciniak-Kuczynski (M-K) method for computation of an extended stress-based forming limit curve (FLC) is presented. The extended stress-based FLC is built based on equivalent plastic stress versus mean stress. This curve has some advantages in comparison with the conventional FLC. This new criterion is much more strain path independent than the conventional FLC. The effect of strain path on the predicted extended stress-based FLC is reexamined. For this purpose, two types of pre-straining on the sheet metal have been loaded. Moreover, the plane stress state assumption is not adopted in the current study. The influence of a through-thickness compressive normal stress is also investigated theoretically. The verifications of the theoretical FLCs are performed by using some available published experimental data.

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“…In this study, based on (Faraji et al, 2008(Faraji et al, , 2010Hashemi et al, 2010) the metal bellows was formed in two stages (bulging and folding) from seamless full annealed tube. Loading conditions (axial displacement and internal pressure) are shown in Fig.…”

Section: Fe Modelingmentioning

confidence: 99%

“…However, failures such as buckling and necking which lead to burst of the tube could occur in the tube hydroforming process (Guan & Pourboghrat, 2008;Kim et al, 2009). The causes of such defects are mainly due to wrong loading conditions in applying the fluid pressure and axial feeding simultaneously (Faraji et al, 2010). Thus, it is important to conduct more research in this field (e.g., tube hydroforming process).…”

Section: Introductionmentioning

confidence: 99%

Analysis of necking in tube hydroforming by means of extended forming limit stress diagram

Hashemi¹

2014

10.5267/j.esm

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In this paper, an extended forming limit stress diagram (EFLSD) was applied to predict neck initiation failure in tube hydroforming of metal bellows. The proposed EFLSD was used in conjunction with ABAQUS/ EXPLICIT finite element simulations to predict the onset of necking in tube hydroforming of metal bellows. The amount of calibration pressure and axial feeding required to produce an acceptable part in finite element method (FEM) were compared with the published experimental data and a satisfactory agreement between the FEM and published test results was achieved. Therefore, the present approach can be used as a reliable criterion for designing metal bellows hydroforming processes and reducing the number of costly trials.

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Hydroforming Limits in Metal Bellows Forming Process

Cited by 34 publications

References 16 publications

Guidelines for Tool-Size Selection for Single-Point Incremental Forming of an Aerospace Alloy

Guidelines for Tool-Size Selection for Single-Point Incremental Forming of an Aerospace Alloy

Analysis of the extended stress-based forming limit curve considering the effects of strain path and through-thickness normal stress

Analysis of necking in tube hydroforming by means of extended forming limit stress diagram

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