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Mechanical Characterisation of Truss Models by Three-Point Bending Test

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Abstract

This paper experimentally determines the stress on the central structural element of a sandwich structure made of two types of truss model: core-filled model and core-spaced model. The sandwich board is fabricated by casting AC4C aluminum alloy. From the experimental results of the three-point mechanical bending and conventional theoretical methods, the stress range of core-filled model was 28.4 to 30.68 MPa and of core-spaced model was 30.71 to 33.17 MPa for the sandwich core structure. Our results validate the use of these models in future research on lightweight structures.

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Abbreviations

δ:

The elastic deflection of the indenters on the top face relative to on the bottom face

l :

The span between the outer supports

b:

A sandwich beam of uniform width

c:

Perfectly bonded to a metallic foam core of thickness

d:

The spacing of the mid-planes of the face-sheets

t:

The face sheet of thickness

y:

The distance from the neutral axis

σf :

The longitudinal bending stresses in the face

σc :

The longitudinal bending stresses in the core

A:

The cross-sectional area

E:

The Young’s modulus

Ec :

The Young’s modulus for the core

Ef :

The Young’s modulus for the face-sheet

F:

The total load applied to the beam

G:

The shear modulus

Gc :

The shear modulus of the core

(AG)eq :

The equivalent shear rigidity

(EI)eq :

The equivalent flexural rigidity

M:

The moment at the cross-section of interest

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Acknowledgements

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Funding

Funding was provided by ministry of education, (Grant No. 2018R1D1A1B07041383).

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  1. Department of Phronesis Convergence, Kyungnam University, 7 Kyungnam Dahak Ro, Masan Happo Gu, Room#507, Engineering Building #1, 5Th Floor, Changwon, Gyeongsangnamdo, 51767, Republic of Korea

    Jeongho Choi

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Choi, J. Mechanical Characterisation of Truss Models by Three-Point Bending Test. Int J Steel Struct 23, 331–344 (2023). https://doi.org/10.1007/s13296-023-00731-5

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