PSI - Issue 42

Ayse Cagla Balaban et al. / Procedia Structural Integrity 42 (2022) 284–291 Ayse Cagla Balaban et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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Table 5. Results of sandwich edgewise compression test

Ultimate Edgewise Compressive Strength (MPa)

Maximum Force (N)

Cross-Sectional Area (mm 2 )

Specimen 1

309

51412

205.65

Specimen 2

309

59773

193.44

Specimen 3

309

64232

207.87

Average:

58472

202.32

Standard Deviation:

6508

7.77

4. Discussions In sandwich composite materials, the facesheets are supported by the core, which carries the tensile and compressive stresses. The core material should have various crucial qualities. One of them is to maintain an adequate spacing between the facesheets to prevent the faces from sliding over one another and it must be rigid in shear as well. In order to obtain mechanical properties, standard test procedures have been applied in this study, and the results can be seen in Table 6. The desired qualities and performance can be achieved by correct design of thicknesses of facesheets and core, and the materials of composite components. The findings show that the faces do not cooperate if the core is weak in shear, and the sandwich loses its stiffness. Table 6. Experimental results of material’s mechanical properties Sandwich Flatwise Tensile Strength Sandwich Flatwise Compressive Strength Sandwich Edgewise Compressive Strength

Specimen Dimensions

=

= = [ ( 1 + 2 )]

Characteristic Equations

Average of Samples (MPa)

1.71

6.70

202.32

5. Conclusion The upper and lower facesheets of the sandwich composite panel’s physical and mechanical characteristics were examined. Experimental testing for the sandwich flatwise tensile, sandwich edgewise compression and sandwich flatwise compression tests were performed. Under the guidance of ASTM standards, the physical and mechanical characteristics of upper and lower laminates were examined, and they were incorporated into related equations to derive shear stress and maximum tensile and compression stress values. This study will be used as preliminary research for the investigation of fracture and impact behaviour of the novel sandwich composites.