Volume 21, Issue 4 (April 2021)
Modares Mechanical Engineering 2021, 21(4): 263-272 |
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Gholami V, Taheri-Behrooz F, Memar-Maher B. Measurement of face to core debonding fracture toughness of core grooved sandwich structures under mode I of loading. Modares Mechanical Engineering 2021; 21 (4) :263-272
URL: http://mme.modares.ac.ir/article-15-46818-en.html
URL: http://mme.modares.ac.ir/article-15-46818-en.html
1- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
2- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran ,taheri@iust.ac.ir
3- Iranian Space Research Center, Tehran, Iran
2- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran ,
3- Iranian Space Research Center, Tehran, Iran
Abstract: (2121 Views)
The sandwich panel is a combination of a soft core and two stiff, high-strength facesheets. In many cases, the connection between the facesheet and the core is considered as a critical point that can damages the integrity of the sandwich structure. In this study, the debonding toughness between the facesheet and the core in sandwich beams with grooved cores made of Kevlar 49/polyester facesheets and polyurethane foam core has been measured experimentally. The values of the strain energy release rate obtained at the onset of crack growth for the tested specimens are in the range of 340 (J/Square meters) and increase with the crack growth up to 500 (J/Square meters). One of the innovations of the present study is to investigate the effect of grooving the core of the sandwich panel on the resistance of the structure to the growth of interfacial cracks. The results show that by placing the groove inside the core of the sandwich panel, the interfacial crack stops during growth by hitting each groove and requires higher force to restart its growth. This phenomenon increases the resistance of this type of structure against the growth of cracks in the face/core area. In this research, a model based on cohesive zone theory was used to simulate crack growth in the tested specimens. Comparison of load-displacement curves obtained from the analysis shows that the proposed model has a good ability to predict the behavior of the structure under similar loading conditions.
Keywords: Sandwich panel, Fracture Toughness, Interfacial crack, Cohesive zone model, Strain energy release rate
Article Type: Original Research |
Subject:
Damage Mechanics
Received: 2020/10/13 | Accepted: 2020/12/19 | Published: 2021/03/30
Received: 2020/10/13 | Accepted: 2020/12/19 | Published: 2021/03/30
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