A Viscoplastic Material Model Based on Overstress for the Simulation of Incremental Sheet Forming of Thermoplastics

Yonan, S. Alkas; Haupt, Peter; Kwiatkowski, L.; Franzen, Volker; Brosius, Alexander; Tekkaya, A. Erman

doi:10.1063/1.3589614

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…As seen in Figure 6, the relative error arising from the utilization of the first approximation of the inplane stresses, which were solely based on the tensile stress-strain curve of PVC, is rather small (below 10%). This means that the strength differential effect of PVC may be neglected from calculation of plastic flow and failure, as it was previously done by Alkas Yonan and coworkers [8,9], who only considered the tensile stress-strain curve during the development of their non-linear viscoplastic material model for thermoplastics. Hence, by taking the abovementioned simplification into account, the critical values D crit of the noncoupled ductile damage models proposed by Cockcroft and Latham [14], Rice and Tracey [16] and Ayada et al [17] can be easy and straightforwardly determined by means of Equations (7), without the need to apply inverse, cumbersome, calibration procedures based on numerical simulations.…”

Section: Results and Discussion 31 Plastic Flow And Failurementioning

confidence: 90%

“…Alkas Yonan et al -eXPRESS Polymer Letters Vol.8, No.5 (2014) AA1050-O 80º AA1050-H111 76º AA5052 74º Steel DC01 76º DC04 74º AISI 304L 74º Titanium Grade 2 65º Polymer PET~90º PVC 66º the evaluation of the non-linear viscoplastic material model proposed by Alkas Yonan and coworkers [8,9] was limited by small deformations, which prevented analysing plastic flow and the corresponding stress field for high values of strain. As a result of the abovementioned limitations, the aims and scope of this paper is to present an alternative and effective methodology to characterize plastic flow and failure in the SPIF of polymers.…”

mentioning

confidence: 99%

“…Silva et al [7] developed a theoretical framework based on membrane analysis and pressure-sensitive yield surfaces to characterize plastic flow and failure in polymer sheets. Alkas Yonan and coworkers [8,9] developed a non-linear viscoplastic material model for thermoplastics and its finite strain extension to the finite element simulation of PVC parts produced by SPIF. However, both developments exhibited difficulties in modelling the SPIF of polymers.…”

mentioning

confidence: 99%

“…The discussion on the relative performance of the SPIF of polymers against that of metals performed by Silva et al [6] may also be included in the first line approach ( Table 2). The works of Silva et al [7] and Alkas Yonan and coworkers [8,9] were built upon the second line approach. Silva et al [7] developed a theoretical framework based on membrane analysis and pressure-sensitive yield surfaces to characterize plastic flow and failure in polymer sheets.…”

mentioning

confidence: 99%

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Plastic flow and failure in single point incremental forming of PVC sheets

Yonan¹,

Silva²,

Martins³

et al. 2014

Express Polym. Lett.

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Section: Results and Discussion 31 Plastic Flow And Failurementioning

confidence: 90%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Plastic flow and failure in single point incremental forming of PVC sheets

Yonan¹,

Silva²,

Martins³

et al. 2014

Express Polym. Lett.

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“…Sy et al [78] selected a modified viscoelasticity theory based on overstress and the simulation and experimental results showed good agreement for the prediction of the thickness and the forming accuracy. Furthermore, Yonan et al [34,79] developed a non-linear visco-plastic material model used in ISF of thermoplastics and extended it to the FE simulation of PVC parts shaped by SPIF. However, this material model has limited applicability only with small deformations, making it difficult to analyse the plastic flow and the stress states for large strain.…”

Section: Deformation Mechanicsmentioning

confidence: 99%

Incremental sheet forming of thermoplastics: a review

Zhu

Popov

2020

Int J Adv Manuf Technol

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Incremental sheet forming (ISF) is a promising flexible manufacturing process, which has been tested in sheet forming of various metallic materials. Although ISF-based forming of thermoplastics is relatively new, it has drawn considerable interests and significant progress has been made in recent years. This paper presents a review of concurrent research on the emerging trend of thermoplastic-focused ISF processes. Attention is given to the processing conditions including process setup, process parameters and forming forces. The deformation mechanism and failure behaviour during ISF of thermoplastics are evaluated, which leads to detailed discussions on the formability, effect of different process parameters and the forming quality such as geometric accuracy, surface finish and other consideration factors in ISF of thermoplastics. A comparison of important similarities and differences between ISF of thermoplastic and metallic materials is made. Finally, a brief discussion is provided on the technical challenges and research directions for ISF of thermoplastic materials in the future.

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Single point incremental forming of bilayer sheets made of two different thermoplastics

Hernández-Avila

Lozano-Sánchez

Perales-Martínez

et al. 2018

J of Applied Polymer Sci

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A novel configuration of bilayer composite sheets containing different polymers is described and used for the first time in the single point incremental forming (SPIF) process. These bilayer sheets made of polypropylene (PP) and Santoprene are fabricated by hot welding, and shaped with cone‐like geometry by SPIF. The bilayer configuration is such that only one of the containing polymers is in contact with the forming tool. During the SPIF processing, the bilayer sheets show a noticeable difference in the mechanical response, depending mainly on the polymer that is not in contact with the forming tool, which is related to a lower polymer softening. The performance of the bilayer sheets is compared against the neat polymers and a blend of these with a mass ratio of 1:1. The observed effect is introduced as a dual effect of properties that brings together in a single composite sheet, properties for a better performance in SPIF and wider functionality of the fabricated parts, evidenced by a lower material softening and higher mechanical strength, in comparison with the two individual polymers, and even better than the blend of both. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47093.

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A Viscoplastic Material Model Based on Overstress for the Simulation of Incremental Sheet Forming of Thermoplastics

Cited by 9 publications

References 6 publications

Plastic flow and failure in single point incremental forming of PVC sheets

Plastic flow and failure in single point incremental forming of PVC sheets

Incremental sheet forming of thermoplastics: a review

Single point incremental forming of bilayer sheets made of two different thermoplastics

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