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

Yonan, S. Alkas; Silva, M.B.; Martins, P.A.F.; Tekkaya, A. Erman

doi:10.3144/expresspolymlett.2014.34

Cited by 33 publications

(6 citation statements)

References 16 publications

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“…It is now well-established that PVC firstly undergoes linear elastic deformations, followed by non-linear plastic deformations, after which softening occurs and there is a period of re-hardening up until failure. Research studies by Ognedal [31], Kendall and Siviour [32], and Alves and Martins [33] support the findings of Yonan et al [30] and demonstrate congruent behaviour. These experimental results also show that the strain at which the linear elastic period of the curve ends is consistently at very small values (below 0.05).…”

Section: Pvcsupporting

confidence: 57%

“…The PVC used in the studied physical specimen has a modulus of elasticity and ultimate compressive strength of 7.91 GPa and 58 MPa, respectively. Yonan et al [30] carry out experimental testing on PVC to determine its plastic behaviour and to investigate how failure occurs in PVC samples. It is now well-established that PVC firstly undergoes linear elastic deformations, followed by non-linear plastic deformations, after which softening occurs and there is a period of re-hardening up until failure.…”

Section: Pvcmentioning

confidence: 99%

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Non-Linear Numerical Modelling of Sustainable Advanced Composite Columns Made from Bamboo Culms

Richardson

Mofidi

2021

Construction Materials

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The present article uses the finite element analysis (FEA) software ABAQUS to model a bamboo-based advanced composite column for construction. Different numerical models were analysed to be able to predict the behaviour of a bamboo-based composite column tested by the same group. Bamboo-based composites maintain the inherent excellent mechanical properties of raw bamboo whilst adding a certain degree of processing and engineering. Thus, the composite individual samples are more consistent and reliable when compared with their raw counterparts. A buckling analysis is carried out to determine the response of the composites to axial compressive loading. Different modelling elements and imperfection parameters were implemented separately in different FEA models so that the efficacy of each could be established and suggestions could be made with regard to the modelling elements and size of imperfection that should be used in future models. The results are compared to empirical findings, giving insights into the quality of results that can be obtained using numerical modelling. This also allowed for an evaluation of the methods and assumptions applied in the model. The load at rupture and displacements obtained by the numerical model were comparable to the experimental findings, with only minor differences observed.

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Section: Pvcsupporting

confidence: 57%

Section: Pvcmentioning

confidence: 99%

Non-Linear Numerical Modelling of Sustainable Advanced Composite Columns Made from Bamboo Culms

Richardson

Mofidi

2021

Construction Materials

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“…The methodologies used to determine the failure limits in sheet metal were adapted to the polymeric sheet, allowing the successful determination of necking and fracture limits for PC sheet with 1 mm of thickness at room temperature (25 • C). The knowledge of accurate formability limits by necking and fracture is relevant for defining sheet forming processes like, for example, incremental sheet forming where the knowledge of the fracture limits is essential [8][9][10][11].…”

Section: Discussionmentioning

confidence: 99%

On the Determination of Forming Limits in Polycarbonate Sheets

et al. 2020

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By proposing an adaptation of the methodology usually used in metal forming, this paper aims to provide a general procedure for determining the forming limits, by necking and fracture, of polymeric sheet. The experimental work was performed by means of Nakajima specimens with different geometries to allow to obtain strains in the tensile, plane, biaxial and equibiaxial states for Polycarbonate sheet with 1 mm of thickness. The application of the time-dependent and flat-valley approaches used in metals has been revealed appropriate to characterize the onset of necking and obtain the forming limits of polycarbonate, despite the stable necking propagation typical of polymeric sheets. An analysis of the evolution of the strain paths along a section perpendicular to the crack allowed for a deeper understanding of the steady necking propagation behaviour and the adoption of the methodology of metals to polymers. The determination of the fracture strains was enhanced with the consideration of the principal strains of the DIC system in the last stage, just before fracture, due to the significant elastic recovery typical of polymeric sheets. As a result of this analysis, accurate formability limits by necking and fracture are obtained for polycarbonate sheet, together with the principal strain space, providing a general framework for analysing incremental sheet forming processes where the knowledge of the fracture limits is relevant.

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“…It can be seen that the research of different aspects related to the use of single-point incremental forming in the case of plastic parts has been a topic addressed by different researchers [2][3][4][5]7,[16][17][18]. Some of the researches focused on the behavior of polycarbonate used to generate parts or surfaces by single-point incremental forming [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Influence of Lubrication and Cooling on the Quality of Single-Point Incremental Forming Parts of Polycarbonate Sheets

Beşliu

Slătineanu

Dodun

et al. 2021

JMMP

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Without ensuring high productivity, single-point incremental forming allows obtaining cavities in sheet-type workpieces by rotating and moving a rotary forming tool along a predetermined path. The process can be used in the case of both metal and plastic sheets. The heat generated in the processing area is expected to cause different elongations and contractions, affecting the final dimensional accuracy of the surfaces obtained. A full factorial experiment with three independent variables at two levels was used to investigate the correlations between the values of some of the process input factors and the results of thermal processes developed at the contact between the rotating tool and the workpiece. Experimental research was performed in dry single-point incremental forming, using lubricants and, respectively, with the generation of a decrease in temperature by the use of coolants. Empirical mathematical models were determined, and they confirmed the influence of the values of considered input factors on the thermal processes developed at the contact between the tool and the workpiece material. Temperatures of up to 147 °C were recorded in the processing area of the plastic workpiece.

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

Cited by 33 publications

References 16 publications

Non-Linear Numerical Modelling of Sustainable Advanced Composite Columns Made from Bamboo Culms

Non-Linear Numerical Modelling of Sustainable Advanced Composite Columns Made from Bamboo Culms

On the Determination of Forming Limits in Polycarbonate Sheets

Influence of Lubrication and Cooling on the Quality of Single-Point Incremental Forming Parts of Polycarbonate Sheets

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