Next Article in Journal
Ion-Imprinted Polymers: Synthesis, Characterization, and Adsorption of Radionuclides
Next Article in Special Issue
The Influence of the Physical-Mechanical Parameters of Rock on the Extent of the Initial Failure Zone under the Action of an Undercut Anchor
Previous Article in Journal
Laser Shock Peening of SiCp/2009Al Composites: Microstructural Evolution, Residual Stress and Fatigue Behavior
Previous Article in Special Issue
The Effect of Geometrical Non-Linearity on the Crashworthiness of Thin-Walled Conical Energy-Absorbers
 
 
Article

Investigation by Digital Image Correlation of Mixed-Mode I and II Fracture Behavior of Polymeric IASCB Specimens with Additive Manufactured Crack-Like Notch

1
Department of Industrial Engineering (DIN), Alma Mater Studiorum—Università di Bologna, Viale Del Risorgimento 2, 40136 Bologna, Italy
2
Department of Industrial Engineering (DIN), Alma Mater Studiorum—Università di Bologna, Via Fontanelle 40, 47121 Forlì, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Gianluca Tozzi
Materials 2021, 14(5), 1084; https://doi.org/10.3390/ma14051084
Received: 14 January 2021 / Revised: 19 February 2021 / Accepted: 23 February 2021 / Published: 26 February 2021
(This article belongs to the Special Issue Research and Modeling of Materials Fatigue and Fracture)
In this work, the fracture mechanics properties of polyamide (PA) specimens manufactured by the selective laser sintering (SLS) technology are investigated, in which an embedded crack-like notch was inserted in the design and produced during the additive manufacturing (AM) phase. To cover a wide variety of mode I/II mixity levels, the inclined asymmetrical semicircular specimen subjected to three points loading (IASCB) was employed. The investigation was carried out by analyzing the full displacement field in the proximity of the crack tip by means of the digital image correlation (DIC) technique. To characterize the material, which exhibits a marked elastic-plastic behavior, the quantity J-integral was evaluated by two different methods: the first one exploits the full fields measured by the DIC, whereas the second one exploits the experimental load–displacement curves along with FEM analysis. The DIC methodology was experimentally validated and proposed as an alternative method to evaluate the J-integral. It is especially suited for conditions in which it is not possible to use the conventional LDC method due to complex and possibly unknown loading conditions. Furthermore, results showed that the AM technique could be used effectively to induce cracks in this type of material. These two aspects together can lead to both a simplification of the fracture characterization process and to the possibility of dealing with a wider number of practical, real-world scenarios. Indeed, because of the nature of the additive manufacturing process, AM crack-like notches can be sintered even having complex geometry, being three-dimensional and/or inside the tested structure. View Full-Text
Keywords: additive manufacturing; selective laser sintering; polyamide; nylon; fracture toughness; J-integral; mixed-mode I-II; IASCB specimens; digital image correlation additive manufacturing; selective laser sintering; polyamide; nylon; fracture toughness; J-integral; mixed-mode I-II; IASCB specimens; digital image correlation
Show Figures

Figure 1

MDPI and ACS Style

Brugo, T.M.; Campione, I.; Minak, G. Investigation by Digital Image Correlation of Mixed-Mode I and II Fracture Behavior of Polymeric IASCB Specimens with Additive Manufactured Crack-Like Notch. Materials 2021, 14, 1084. https://doi.org/10.3390/ma14051084

AMA Style

Brugo TM, Campione I, Minak G. Investigation by Digital Image Correlation of Mixed-Mode I and II Fracture Behavior of Polymeric IASCB Specimens with Additive Manufactured Crack-Like Notch. Materials. 2021; 14(5):1084. https://doi.org/10.3390/ma14051084

Chicago/Turabian Style

Brugo, Tommaso Maria, Ivo Campione, and Giangiacomo Minak. 2021. "Investigation by Digital Image Correlation of Mixed-Mode I and II Fracture Behavior of Polymeric IASCB Specimens with Additive Manufactured Crack-Like Notch" Materials 14, no. 5: 1084. https://doi.org/10.3390/ma14051084

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop