This document summarizes research on the static and modal analysis of a sandwich beam structure with a magnetorheological honeycomb core. The beam was designed with aluminum face sheets and a honeycomb core filled with different ratios of silicon rubber and iron particles to create an magnetorheological elastomer. Finite element analysis was performed in ANSYS to analyze two cases with different filler ratios. The results showed that natural frequencies decreased with higher iron particle ratios due to reduced stiffness. Higher deformation was also observed with an ABS honeycomb core compared to PLA, since ABS has lower strength. In conclusion, the design provides insights into sandwich beam structures using magnetorheological elastomers.

1. Static and Modal Analysis of Sandwich Beam
Structure with Magnetorheological
Honeycomb Core
AFFILIATION:- SCHOOL OF MECHANICAL ENGINEERING,
SOUTHEAST UNIVERSITY
NANJING, CHINA
The 6th International Conference on Mechanical Engineering and Automation Science
(ICMEAS 2020)
Moscow, Russia | Oct 29-31 |
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2. The 6th International Conference on Mechanical Engineering and Automation Science
(ICMEAS 2020)
Moscow, Russia | Oct 29-31
2
Introduction / Literature review
Designing of Honeycomb Core and Sandwich Beam
Modeling in ANSYS
Results and Discussions
Conclusion
References
Outline

3. Presentation
3
Introduction / Literature review
Designing of Honeycomb Core and Sandwich Beam
Modeling in ANSYS
Results and Discussions
Conclusion
References

4. Introduction
4
 The dynamic responses of mechanical structures
 Eliminating or reducing undesirable resonance
 Passive damping treatments
 Manufacturing and design of new materials.
 These materials can modify their properties when affected by an
external agent.

5. Introduction
5
 Magnetorheological Elastomers (MREs) /Smart Materials.
 Unique anisotropic properties and the controllable stiffness
 Simultaneous fluctuation in damping and stiffness
 The mechanical properties of elastomers specifically in terms of
modified hyper elasticity, vibration and acoustic damping properties
make them a major asset in a variety of industrial applications.

6. Literature Review
6
 Many researchers have made efforts to improve MREs’ properties
due to the numerous applications.
 The mechanical and magnetorheological properties of the structure
can be varied by MREs made of large and small iron particles blend.
 The natural frequency of a sandwich panel with a core of MR fluid
and skins of metal decreases as the magnetic field increases when
applied to the free end compared to that with magnets closest to the
fixed end of panel.
 The natural frequency of the MRE core between two thin aluminum
layers decreased as the attractive field was moved from the fixed to
the free end of the pillar of the shaft.

7. Literature Review
7
 Furthermore, the change in magnetic flux, MRE patch length, thickness of
core and iron particles percentage can affect the dynamic stability of a
symmetric sandwich beam for the first three modes of vibration.
 The rheological properties of magnetorheological (MR) material varied
when sandwiched between rectangular plates and subjected to varying
magnetic fields.
 The damping coefficient and shear modulus of the elastomer increase when
an attractive field is applied. Versatility in the static performance of the
sandwich structure was observed due to MRE’s solidness and the hardness
factor.

8. Sandwich Beam Design
8
Introduction / Literature review
Designing of Honeycomb Core and Sandwich Beam
Modeling in ANSYS
Results and Discussions
Conclusion
References

9. Presentation
9
 The proposed sandwich beam structure was designed using SolidWorks.
 The beam consists of three main layers; two face sheets and a central
honeycomb core filled with different ratios of silicon rubber and iron particles.
 The honeycomb core was designed first and filled with two different ratios of
silicon rubber and iron particles, then the face sheets were designed and
attached to honeycomb filled with MRE core on both sides.

10. Experimentation
10
 The dimensions of honeycomb core and sandwich beam structure will remain
same in all cases only the silicon layer and iron particles layer dimension will
change to manipulate the ratios of both materials.
 For the case I the dimension of MRE layer was 0.75mm sandwiched
between the two layers of silicon 1.125mm each.
 For case II the silicon layer dimension was 0.75mm each and the
dimension of iron particles was 1.5mm.

11. Sandwich Beam Design
11
Introduction / Literature review
Designing of Honeycomb Core and Sandwich Beam
Modeling in ANSYS
Results and Discussions
Conclusion
References

12. Presentation
12
 The designed sandwich beam structure was the imported in ANSYS to carry
out static and modal analysis.
 The aluminum is selected as face sheets material and the selected material
for honeycomb were PLA or ABS in different cases.
 The PLA and ABS are used as honeycomb materials because of availability and
3D printing manufacturing convenience.
 The filling materials of honeycomb core were considered as silicon rubber and
iron particles in different ratios.
 The beam was considered as cantilever beam so one end was fixed and 50N
force was applied on free end for all the cases to carryout static analysis.
 In next step the fine mesh was generated for the beams structures.
 Finally, modal and static analyses were carried out to determine the mode
shape, total deformation, stress and strain response of the beams.

13. Sandwich Beam Design
13
Introduction / Literature review
Designing of Honeycomb Core and Sandwich Beam
Modeling in ANSYS
Results and Discussions
Conclusion
References

14. Experimentation
14
 The two different cases for each sandwich beam structure containing PLA
and ABS honeycomb were studied.
 The two different cases were differentiated depending on the ratio of the
silicon rubber and iron particles filled in honeycomb to make it act as MRE.
 In the first case (Case I) the honeycomb structure is filled with 75% silicon,
25% iron particles.
 For second case (Case II) 50% silicon, 50% iron particles are filled in
honeycomb structure.

15. Experimentation
15
 For the sandwich beam with PLA honeycomb the resonance frequency was
45.503 Hz and for ABS honeycomb core was 45.049 Hz for case I.
 For case II it can be seen that the resonance frequency of beam with PLA
honeycomb core is 42.980 Hz and ABS core beam is 42.541 Hz.
 The total deformation observed was 13.052mm and 13.043mm for the
sandwich beam with PLA honeycomb core.
 For the sandwich beam with ABS honeycomb core the total deformation
was 13.323mm and 13.308mm for Case I and Case II respectively.

16. Experimentation
16

17. Presentation
17
Case I

18. Presentation
18
Case II

19. Presentation
19
Case I

20. Presentation
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21. Presentation
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Cases Sandwich Beam Characteristics
Case I Case II
PLA
Honeycomb
ABS
Honeycomb
PLA
Honeycomb
ABS
Honeycomb
Mode I (Hz) 45.503 45.049 42.98 42.541
Mode II (Hz) 260.95 243.33 246.66 230.23
Mode III (Hz) 316.8 275.06 299.86 260.76
Total
Deformation
(mm)
13.052 13.323 13.043 13.308
Equivalent Stress
(MPa)
97.53 94.677 97.53 94.692
Equivalent Strain 0.0159 0.0162 0.0138 0.0144

22. Presentation
22
Introduction / Literature review
Designing of Honeycomb Core and Sandwich Beam
Modeling in ANSYS
Results and Discussions
Conclusion
References

23. Experimentation
23
 The numerical analysis of sandwich beams with aluminum face sheet and
a honeycomb core made of PLA or ABS filled with magnetorheological
elastomer (MRE) in different proportions of iron powder and elastomer is
discussed in this study.
 Static and modal analysis simulation was conducted to evaluate and
compare different cases for dynamic properties of the sandwich beams.
 The natural frequencies of MRE sandwich beam shifted due to the
changed ratio of silicon rubber and iron particles for both the cases.
 The natural frequency of the beam decreased due to increased ratio of
iron particles.
 The iron particles manipulated the stiffness characteristic of the beam
that affected the resonance frequency of structure in both cases.
 Secondly the higher deformation was noticed in structure with ABS
honeycomb core because the material strength is less than the PLA.
 Hence the proposed design provides a new insight for the development
of sandwich beam structure with MRE and their response under different
ratios of MRE.

24. Presentation
24
Introduction / Literature review
Designing of Honeycomb Core and Sandwich Beam
Modeling in ANSYS
Results and Discussions
Conclusion
References

25. Experimentation
25

26. 研究成
Thanks for your kind
attention!
Presentation
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