Force Prediction for Incremental Forming of Polymer Sheets

Medina-Sánchez, G.; García-Collado, Alberto; Carou, Diego

doi:10.3390/ma11091597

Cited by 22 publications

(11 citation statements)

References 26 publications

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“…Marques et al [ 13 ] found that an increase in stress triaxiality promotes damage and fracture in the polymers. Medina-Sanchez et al [ 14 ] proposed a model to predict the forming force. Martins et al [ 15 ] identified wrinkling and fracture as two failure modes in the ISF of thermoplastics.…”

Section: Introductionmentioning

confidence: 99%

Post-Forming Mechanical Properties of a Polymer Sheet Processed by Incremental Sheet Forming: Insights into Effects of Plastic Strain, and Orientation and Size of Specimen

2020

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The innovative Incremental Sheet Forming (ISF) process affects the post-forming properties of thermoplastic polymers. However, the effects of degree of plastic strain, and the orientation and size of specimen on the mechanical properties are still unknown. In the present study, therefore, the ISF process is performed on a polymer sheet by varying the plastic strain ranging from 6% to 108%. The corresponding effects on the properties and associated polymer structure are quantified by conducting a variety of mechanical and structural tests. The results reveal that the post-ISF tensile properties like yield stress, ultimate stress, drawing stress, elastic modulus and elongation decrease from 26.6 to 10 MPa, 30.5 to 15.4 MPa, 18.9 to 9.9 MPa, 916 to 300 MPa and 1107% to 457%, respectively, as the strain increases in the investigated range. The value of post-ISF relaxation properties, contrary to the tensile properties, increases with increasing strain up to 62%. Particularly, reductions in stress, strain and modulus increase from 41% to 202%, 37% to 51%, and 41% to 202%. As regard the orientation effect, the sheet in the feed direction shows greater strength than the transverse direction (up to 142% in yield stress and 72% in ultimate stress). Moreover, the smaller sample offers greater strength than the larger one (up to 158% in yield stress and 109% in ultimate stress). The analysis of the post-ISF tensile properties and structural results lead us to conclude that the drop in the tensile properties due to increasing strain occurs due to corresponding increase in the voids area fraction (1.25% to 31%) and a reduction in the crystallinity (38% to 31%).

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Section: Introductionmentioning

confidence: 99%

Post-Forming Mechanical Properties of a Polymer Sheet Processed by Incremental Sheet Forming: Insights into Effects of Plastic Strain, and Orientation and Size of Specimen

2020

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“…The forces during the SPIF of different polymeric materials were analysed by Medina-Sanchez et al [7]. This study was a combined analytical-numerical-experimental study for polycarbonate sheets and polyvinylchloride sheets.…”

Section: State Of the Artmentioning

confidence: 99%

Experimental Study Regarding PA and PE Sheets on Single Point Incremental Forming Process

Roşca

Oleksik

2021

MATEC Web Conf.

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The present paper aims to present an experimental study on the behaviour of PA and PE sheets during the single point incremental forming. Due to the fact that the purpose of this research is to study the behaviour of PA and PE sheets during the single point incremental process both in terms of process forces and in terms of major and minor strain and thickness reduction, a Kuka Kr210 robot was chosen as an alternative to using a universal milling machine. The specimens were made of 3 mm PA and PE sheets. The size of the sheets was 250 mm x 250 mm. The forces measured on the three directions of the coordinate axes were compared. To measure the major strain, minor strain and thickness reduction, the digital image correlation method was applied.

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“…As demonstrated, the maximum forming force is decreased with the increased spindle speed and the decreased tool radius. To predict axial force in SPIF of thermoplastic sheets, two procedures were proposed by Medina-Sanchez et al [73], the first of which is based on the finite element simulation, the other is a simple semi-analytical model. The results showed reasonable agreement with the experimental measurements with a relative error of less than 10%.…”

Section: Forming Forcementioning

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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Force Prediction for Incremental Forming of Polymer Sheets

Cited by 22 publications

References 26 publications

Post-Forming Mechanical Properties of a Polymer Sheet Processed by Incremental Sheet Forming: Insights into Effects of Plastic Strain, and Orientation and Size of Specimen

Post-Forming Mechanical Properties of a Polymer Sheet Processed by Incremental Sheet Forming: Insights into Effects of Plastic Strain, and Orientation and Size of Specimen

Experimental Study Regarding PA and PE Sheets on Single Point Incremental Forming Process

Incremental sheet forming of thermoplastics: a review

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