PSI - Issue 47

Andreal Muhammad Naufal et al. / Procedia Structural Integrity 47 (2023) 133–141 Naufal et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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test Jig span (L) which is illustrated Figure 3 (ASTM, 2007). Referring to the dimensions of the specimen we made, then the placement of the specimen on the jig, span jig, and stroke placement can be seen in Figure 4. The bending test is carried out using a universal testing machine with a stroke speed of 1 mm/minute. This speed corresponds to the speed recommended by ASTM D7264. Then, the testing machine will press the test object at point P until there is a failure in the material. After that, the testing results are obtained in the form of elongation (mm) and load (N) given to the test object.

Figure 3. Schematic of three point bending experiment (in mm).

Figure 4. Specimen setup according to ASTM D7264 procedure.

The stress test results used have newton units, and the strain used is %GL which can be searched using the strain formula in the ASTM D7264 test guide. The formula for finding %GL can be seen in Equation 1. = 6 ℎ 2 (1) Where ε is the strain, δ is the deflection on the stroke, h is the thickness of the test specimen, and L is the span of the support. The value of which is already specified in the ASTM D7264. This formula is used to find the maximum strain on the outer shell in the middle of the hammer (ASTM, 2007). 4. Numerical Simulation Numerical simulation using standard ABAQUS software using a windows cluster with a computer of 6 cores and 12 threads on average simulation takes 4-8 hours depending on the material configuration and mesh configuration. In terms of numerical simulations, carbon fiber modeling uses lamina by writing down previously planned orientations. Modeling honeycomb core parts is conducted by idealizing the geometry as shell types. The two materials are combined using a constraint tie on the interaction menu.