Crack initiation and growth in additively printed ABS: Effect of print architecture studied using DIC

Isaac, John P.; Dondeti, S.; Tippur, Hareesh V.

doi:10.1016/j.addma.2020.101536

Cited by 10 publications

(6 citation statements)

References 34 publications

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“…Elsewhere, strain distributions were more uniform until step 648 where nonuniform distributions appeared. The strain levels in these zones are higher than the yield strain of this material, which is estimated (for ±45° configurations) to be about 0.02 34,47 . The shape of the concentration zones is due to the filaments deposition orientations (Figure 1D).…”

Section: Experimental Setup and Protocolmentioning

confidence: 79%

“…Since the J-integral is path independent 23 , different contours were considered. However, to avoid nonlinear effects in the vicinity of the crack tip, the path independence was carefully checked on domains not too close to the crack tip 27,34 . Further, the method was also applied to displacement and strain fields obtained by a finite element calculations.…”

Section: Methods Validationmentioning

confidence: 99%

“…J ‐integral evaluations using directly measured crack displacement fields and/or hybrid methods are likely to be transferable to AM polymeric materials. Very recently, Issac et al 34 applied the approach of Barhli et al 30 to examine the fracture behavior of three in‐plane FFF printed architectures made of ABS.…”

Section: Introductionmentioning

confidence: 99%

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Crack growth measurement and J‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling

Bouaziz

Djouda

Zouaoui

et al. 2021

Fatigue Fract Eng Mat Struct

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This paper presents and compares two combined experimental-numerical techniques for the investigation of fracture properties of additively manufactured polymer parts using digital image correlation (DIC) measurements. The first method only uses measured kinematic fields, and the second is based on Finite Element simulations driven by measured boundary conditions. A mini Single Edge Notched Tensile sample manufactured by fused filament fabrication with ABS is studied. It is shown that both methods locally extract J-integrals, and the crack tip is accurately located by the FE-based method. By comparing computed displacements to those measured via DIC, it is possible to locally check the validity of the numerical model. The initiation and propagation stages are analyzed independently thanks to two different magnifications of acquired image series.

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Section: Experimental Setup and Protocolmentioning

confidence: 79%

Section: Methods Validationmentioning

confidence: 99%

See 1 more Smart Citation

Crack growth measurement and J‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling

Bouaziz

Djouda

Zouaoui

et al. 2021

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Prior studies on printed ABS specimens with the DIC technique were concentrated on macro specimens where the imaging was performed via digital cameras (see, e.g. [29][30][31][32]). In such macro settings, local strain distribution leading to failure and activation of various micromechanisms cannot be detected precisely.…”

Section: Sample Preparationmentioning

confidence: 99%

Design and manufacture of a micro-tensile testing machine for in situ optical observation and DIC analysis: application to 3D-printed and compression-molded ABS

Nazari-Onlaghi

Sadeghi

Karimpour

2021

J. Micromech. Microeng.

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In this paper, a novel micro-tensile testing apparatus is designed and built to characterize the micromechanical behavior of materials. Furthermore, a special geometry for micro specimens is introduced that could facilitate problems related to the handling, gripping, and aligning such specimens. The device can be integrated with an optical microscope to observe the microstructural evolution taking place during deformation. Using the developed system, the micromechanical response of additively-printed and compression-molded ABS was determined. 3D-printed specimens demonstrated higher mechanical properties over the compression-molded specimens. Digital image correlation (DIC) technique was also applied to the optical images taken during deformation to measure the strain field in a micron-sized area of interest. DIC results revealed a more intense strain localization for the 3D-printed specimen compared to the monolithic sample. Comparing stress–strain curves and DIC results indicate that the apparatus and technique were quite successful in the in situ characterization of mechanical response.

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“…in the obtained images, which is only composed of a large number of random speckles, thus it is also known as digital speckle correlation method (DSCM). Due to the advantages of non-destructive, non-contact, low cost and low requirements for the measurement environment, as well as the ability to provide high-resolution displacement and strain fields, DSCM has been widely used in scientific research and engineering practice, such as civil engineering [1,2], biology [3][4][5], medicine [6,7], aerospace [8][9][10], industrial manufacturing [11,12], material science [13][14][15], Internet of Things [16], autonomous driving technology [17], deep learning algorithm [18], nanotechnology [19] and X-ray CT scanning technique [20,21].…”

Section: Introductionmentioning

confidence: 99%

Improved Search Algorithm of Digital Speckle Pattern Based on PSO and IC-GN

et al. 2022

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Digital speckle correlation method has not only been widely used in a variety of photometric mechanical scenarios, but also integrated with multiple disciplines. In the future, it will even be inextricably linked to the Internet of Things, autonomous driving, deep learning and other fields. For a given hardware condition, it is of great significance to improve the efficiency of integer-pixel search and increase the accuracy and efficiency of the sub-pixel algorithm. In this paper, we propose an improved digital speckle correlation method, which consists of an integer-pixel search algorithm and a sub-pixel search algorithm. With respect to the integer-pixel search, aiming to address the two problems of uniqueness of maximum value and parameter setting of PSO-W algorithm, the algorithm PSO-1 is proposed, and the results of comparison experiments show that it has higher search efficiency. In terms of sub-pixels, based on IC-GN algorithm with the highest accuracy at present, the IV-ICGN algorithm is proposed, and the simulation experiment results show that the proposed algorithm has higher accuracy and higher efficiency than the comparison algorithm.

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Crack initiation and growth in additively printed ABS: Effect of print architecture studied using DIC

Cited by 10 publications

References 34 publications

Crack growth measurement and J‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling

Crack growth measurement and J‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling

Design and manufacture of a micro-tensile testing machine for in situ optical observation and DIC analysis: application to 3D-printed and compression-molded ABS

Improved Search Algorithm of Digital Speckle Pattern Based on PSO and IC-GN

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