Table 1 Dimensions for auxetic design with MPPs (All dimensions are in mm).

From: Additively manufactured hybrid auxetic structures for enhanced low frequency acoustic performance through experiments and modelling

Layer

Total height

Neck length

Cavity height

Row wise perforation dimension (left to right)

1 & 11

2 & 10

3 & 9

4 & 8

5 & 7

6

Top

5

2

3

2 × 5 Rectangular Perforation with a connected cavity

1st

22

2

20

3.75

3.5

3.25

3

2.75

2.5

2nd

11

3

8

2.25

2

1.75

1.5

1.25

1

Two perforations per cavity

3rd

9

3

6

Fifteen perforations of 0.75 per auxetic cavity

Base

5

 -

 -

Nil

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