Numerical simulation of forming titanium drawn part

Adamus, J.; Lacki, P.

doi:10.1007/s11012-015-0279-9

Cited by 7 publications

(8 citation statements)

References 30 publications

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“…The metric idea is to simulate the same stress-controlled ratcheting process using two sets of parameters. The distance is the maximum discrepancy between the strain trajectories: dist( p (1) , p (2)…”

Section: Mechanics-based Metric For Ratcheting Modelsmentioning

confidence: 99%

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Inspection of ratcheting models for pathological error sensitivity and overparametrization

Kaygorodtseva¹,

Shutov²

2021

Preprint

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Accurate analysis of plastic strain accumulation under stress-controlled cyclic loading is vital for numerous engineering applications. Typically, models of plastic ratcheting are calibrated against available experimental data. Since actual experiments are not exactly accurate, one should check the identification protocols for pathological dependencies on experimental errors. In this paper, a step-by-step algorithm is presented to estimate the sensitivities of identified material parameters. As a part of the sensitivity analysis method, a new mechanics-based metric in the space of material parameters is proposed especially for ratchetingrelated applications. The sensitivity of material parameters to experimental errors is estimated, based on this metric. For demonstration purposes, the accumulation of irreversible strain in the titanium alloy VT6 (Russian analog of Ti-6Al-4V) is analysed. Three types of phenomenological models of plastic ratcheting are considered. They are the Armstrong-Frederick model as well as the first and the second Ohno-Wang models. Based on real data, a new rule of isotropic hardening is proposed for greater accuracy of simulation. The ability of the sensitivity analysis to determine reliable and unreliable parameters is demonstrated. The plausibility of the new method is checked by alternative approaches, like the consideration of correlation matrices and validation of identified parameters on "unseen" data. A relation between pathological error sensitivity and overparametrization is established.

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Section: Mechanics-based Metric For Ratcheting Modelsmentioning

confidence: 99%

“…Dealing with a general non-proportional loading, advanced models of directional distortional hardening are needed[11],[29],[35]. Moreover, simplified J2 yield conditions can be replaced by their anisotropic counterparts[2].…”

mentioning

confidence: 99%

Inspection of ratcheting models for pathological error sensitivity and overparametrization

Kaygorodtseva¹,

Shutov²

2021

Preprint

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“…After the forming process the drawn parts were scanned again in order to determine the amount of springback. The method of measuring the deformation of the panel after its unloading is discussed in detail in [11]. The measurement results are shown in Figure 10.…”

Section: Experimental Verificationmentioning

confidence: 99%

“…Unfortunately, forming products of such thin titanium sheets is one of the most difficult technological processes. It is connected with titanium's limited ability to plastically deform [11][12][13][14][15] and its high springback tendency [16] as well as low tribological properties [17][18][19][20][21]. Difficulties are encountered not only when forming sheet metal but also when joining.…”

Section: Introductionmentioning

confidence: 99%

Analysis of forming thin titanium panels with stiffeners

Adamus

Winowiecka

Dyner

2017

Archives of Metallurgy and Materials

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The growing demand for light and durable products has caused an increase in interest in products formed of thin sheets. In order to ensure sufficient stiffness of the drawn -parts, stiffening is often performed. Unfortunately, during the forming of stiffeners unwanted deformations of the drawn parts very often appear, which prevent them from further exploitation. In the paper, forming thin titanium panels with stiffeners is analysed. The panels are made of sheets of commercially pure titanium: Grades 2, 3 and 4. In the results of numerical analyses which were performed using PamStamp 2G, taking into consideration the impact of the blank holder force and friction conditions on the strain distribution in the drawn parts, sheet thinning and springback values are presented. The numerical analysis results were compared with the experimental tests. It was concluded that in order to prevent panel deformation being a result of residual stresses, it is necessary to ensure adequate friction conditions on the contact surfaces between the deformed material and tools as well as a suitable blank holder force.

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“…We start our study with general theory of incremental fields of initially loaded elastic composites. Many analytical and numerical studies were done in this direction of obtaining the incremental behaviour of cracked elastic composites, [1], [9]- [11]. From the literature, [2]- [4], [12]- [15], we know that in the case of cracked pre-stressed bodies, the incremental stress and displacements fields are described using complex potentials and the initial stress, and play an important role to determine crack propagation.…”

Section: Introductionmentioning

confidence: 99%