Journal
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
Volume 19, Issue 4, Pages 1511-1522Publisher
ELSEVIER
DOI: 10.1016/j.acme.2019.08.005
Keywords
Laser cutting; CFRP; Strain distribution; Mechanical behavior
Funding
- Fundamental Research Funds for Central Universities [531107050870]
- Natural Science Foundation of Hunan Province [2019JJ50053]
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Fiber laser cutting is a promising alternative to the conventional methods in machining CFRP with high efficiency, while the influence of machined quality on strain distribution and mechanical behavior of CFRP laminates is yet not fully understand. The aim of this paper is to study the effect of laser cutting parameters on thermal defects and related mechanical performance. DIC technique was successfully employed to assess full-field strain distribution under tensile loading. The relationship between strain distribution and failure evolution/mode was also investigated. Results showed that various thermal defects including matrix recession, resin decomposition, fiber burrs and delamination were observed on entry and exit surfaces, while microcracks, cavities and striations were prevalent on machined surface. Tensile strength of CFRP laminate with open hole was highly related to applied laser processing parameters. DIC technique indicated that the crack propagation and failure mode were in good agreement with the high level of strains developed around the hole. Matrix-fiber interface cracking, fiber breakage and splitting were the main failure modes at test cessation. (C) 2019 Politechnika Wroclawska. Published by Elsevier B.V. All rights reserved.
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