Examining the Relationship between Forces During Stereolithography 3D Printing and Geometric Parameters of the Model

Kovalenko, Iaroslav; Garan, Maryna; Shynkarenko, Andrii; Zelený, Petr; Šafka, Jiří

doi:10.1051/matecconf/20164002005

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…The linear dependence of separation force on the contact surface area (i.e. the image area) between the printed part and the PDMS film has again recently been experimentally verified in another work (Kovalenko et al , 2016). Despite the unprecedented advancement, particularly, based on the continuous liquid interface production process (Tumbleston et al , 2015), it is still a significant challenge to print a part with wider contact surface area because the separation force will be extremely large even though the separation force is inversely proportional to the thickness of the dead zone.…”

Section: Introductionmentioning

confidence: 63%

“…A pulling-up or separation force needs to be applied to separate the built part from the bottom of the resin vat. If the magnitude of this pulling-up force is of excessive amount, then the built-up part and/or the resin container may break or deform significantly because of the resulting stresses (Huang and Jiang, 2005; Bartolo, 2011, p. 90; Zhou et al , 2013; Liravi et al , 2015; Kovalenko et al , 2016). A few representative pictures are presented in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of separation force for constrained-surface stereolithography process from mechanics perspective

Venketeswaran

Das

et al. 2017

RPJ

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Purpose One of the major concerns of the constrained-surface stereolithography (SLA) process is that the built-up part may break because of the force resulting from the pulling-up process. This resultant force may become significant if the interface mechanism between the two contact surfaces (i.e. newly cured layer and the bottom of the resin vat) produces a strong bonding between them. The purpose of this paper is to characterize the separation process between the cured part and the resin vat by adopting an appropriate and simple mechanics-based model that can be used to probe the pulling-up process. Design/methodology/approach In this paper, the time-histories of the pulling-up forces are measured using FlexiForce® force sensors. The experimental data are analyzed and used to estimate the constitutive parameters of the separation mechanism. Here, the separation mechanism is modeled based on the concept of cohesive zone model (CZM) that is well-studied in the field of fracture mechanics. By using the experimentally measured pulling-up force, this paper proposes a very efficient inverse technique to estimate the constitutive parameters for the CZM. The constitutive laws for the CZM facilitate in relating the separation force at the interface between the cured part and the resin vat in terms of the pulling-up velocity. Unlike work proposed earlier, computationally expensive full-scale finite element runs are not essential in the current work while estimating the required parameters of the constitutive laws. Instead, mechanics-based computationally efficient surrogate model is proposed to readily estimate these constitutive parameters. Findings Two constitutive laws are compared on the basis of their predictions of the separation force profile. Excellent match is obtained between the measured and the predicted separation force profiles. Originality/value This paper selects a suitable mechanics-based model that can characterize the separation process and proposes a computationally efficient scheme to estimate the required constitutive parameters. The proposed scheme can be used to reliably predict the separation force for the constrained-surface SLA process, leading to improved productivity and reliability of the SLA processes in fabricating the built-up parts.

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Section: Introductionmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Investigation of separation force for constrained-surface stereolithography process from mechanics perspective

Venketeswaran

Das

et al. 2017

RPJ

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“…The next experiment was designed for finding more detailed relations between the area of printed surface and the force which appears during the unsticking process [16].…”

Section: Methodsmentioning

confidence: 99%

Implementation of Non-Destructive Evaluation and Process Monitoring in DLP-based Additive Manufacturing

et al. 2017

Self Cite

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This article describes a method of in-situ process monitoring in the digital light processing (DLP) 3D printer. It is based on the continuous measurement of the adhesion force between printing surface and bottom of a liquid resin bath. This method is suitable only for the bottom-up DPL printers. Control system compares the force at the moment of unsticking of printed layer from the bottom of the tank, when it has the largest value in printing cycle, with theoretical value. Implementation of suggested algorithm can make detection of faults during the printing process possible.

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“…The experimental data on the separation forces are given in Appendix 3. The experimental data showed that the separation force was clearly higher for the first 10 layers than for the last 15 layers, which can be attributed to the surface tension between the build plate and photosensitive liquid resin [32]. To maintain the consistency of the samples, only data for the 11 th -25 th layers were taken for statistical analysis.…”

Section: Linear Regression Model For Predicting the Separation Force ...mentioning

confidence: 99%

Comprehensive performance of a low-cost spring-assisted mechanism for digital light processing

Yang

Wu²

2023

Int J Adv Manuf Technol

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Highlights1. Comprehensively evaluated the performance of a low-cost spring-assisted mechanism for the separation process.2. The Taguchi method was used to obtain the parameters that minimize the separation force and time.3. The spring-assisted mechanism demonstrated better manufacturing stability than the pulling-up or tilting mechanism. 4. A linear regression equation was established to predict the separation force of specific geometric shapes and areas to greatly reduce the calculation costs and time.

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Examining the Relationship between Forces During Stereolithography 3D Printing and Geometric Parameters of the Model

Cited by 11 publications

References 2 publications

Investigation of separation force for constrained-surface stereolithography process from mechanics perspective

Investigation of separation force for constrained-surface stereolithography process from mechanics perspective

Implementation of Non-Destructive Evaluation and Process Monitoring in DLP-based Additive Manufacturing

Comprehensive performance of a low-cost spring-assisted mechanism for digital light processing

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