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https://uwmidsun.atlassian.net/wiki/spaces/MECH/pages/2066317358/ASTM+C393+Standard+Test+Method+for+Shear+Strength

Intro

This page will show the simulation results for a 3-point bend test on 75 x 200 mm sandwich construction with various core thicknesses. The purpose of this test is to obtain the compressive strength and from that compressive strength, calculate shear strength. We will use the results from this simulation to compare with our in-person results to see if they conform to our standards.

Stackup:

The test specimen I used was a sandwich of a top layer using 3 layers of 0.15 mm prepreg, a 1 inch, 1/2 inch, or 1/4 inch Nomex and a bottom layer again using 3 layers of 0.15mm prepreg.

The loading condition:

For this test will be a displacement of -18mm on the middle of the top face of the test specimen.

Figure 1: Picture of the test specimen (with fibre directions, my Ansys broke so I couldn't get the directions straight from there but I remember them being this way, hope this is sufficient).

Figure 2: Loading and Boundary Conditions

Figure 3: Deformation of sandwich construction (1/2 inch core)

Results:

Specimen

Maximum Deformation (mm)

1/4 Inch Nomex

18.322

1/2 Inch Nomex

18.194

1 Inch Nomex

18.107

1/4 Inch Nomex

Sandwich Layer

Minimum Stress (MPa)

Maximum Stress (MPa)

Notes

Top Layer

-1469.97

739.81

Averaged value

Honeycomb

-0.028568

0.014324

Bottom Layer

-707.87

1406.53

Averaged value

1/2 Inch Nomex

Sandwich Layer

Minimum Stress (MPa)

Maximum Stress (MPa)

Notes

Top Layer

-1580.6

784.03

Averaged value

Honeycomb

-0.032103

0.01583

Bottom Layer

-766.35

1545.03

Averaged value

I Inch Nomex

Sandwich Layer

Minimum Stress (MPa)

Maximum Stress (MPa)

Notes

Top Layer

-1650.13

812.06

Averaged value

Honeycomb

-0.03429

0.016753

Bottom Layer

-802.7

1631.13

Averaged value

Below is a table of where the stresses occurred in the 1/2 inch Nomex

Layer

Stress

Top

Middle

Bottom

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