Mechanics and failure analysis of stitched sandwich structures damaged by the impact of various energies

Mechanics and failure analysis of stitched sandwich structures damaged by the impact of various energies

Amina Assouli, Bounoua Tab, Fodil Hammadi, Izzeddine Bekkar

Abstract. In the fields of structural mechanics and failure analysis, the presence of damage to structural materials requires several studies. Expertise, damage, is crucial to understand the behavior of structures under various loading conditions. Generally, this damage affects the most stressed area of the structure and can lead to the accumulation and propagation of damage, leading to the partial or total collapse of the structure. On the other hand, stitched sandwich plates are an innovative structural material with extremely high performance in the fields of building mechanics and others. However, when these plates are damaged, it is essential to study their behavior under subsequent loading conditions to assess their ability to withstand a second impact. After having been damaged by a first impact at low speed, a diagnosis was carried out which showed the capacity of these plates to undergo a new shock. The present work focuses on the study of the behavior of these said plates under the effect of a second impact. First, the plates subject to damage in previous works were subjected to a new constant energy impact in order to observe the cumulative effect. In the second part, repeated impact tests were applied to healthy plates according to two different modes. The diversity of impact modes is based on the cycle (time) factor. An immediate repeated shock whereas for the other mode the specimen only suffers a second shock after a rest of 24 hours. An analysis of the behavior of the sandwich plates under the effect of different shocks (without rebound) was carried out. The results obtained showed once again the effectiveness of these structural materials in the face of the effect of impact compared to traditional sandwiches. The damage seen is characterized by positioning and pivoting around the point of impact and is limited to the edges of the collider’s diameter and depth. Fracture analysis of these plates indicated that the damage resulted in a decrease in their bearing capacity.

Keywords
Mechanical, Failure Analysis, First Impact, Stitched Sandwich, Damage, Shock Accumulation, Shock without Rebound

Published online 8/10/2023, 11 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Amina Assouli, Bounoua Tab, Fodil Hammadi, Izzeddine Bekkar, Mechanics and failure analysis of stitched sandwich structures damaged by the impact of various energies, Materials Research Proceedings, Vol. 31, pp 704-714, 2023

DOI: https://doi.org/10.21741/9781644902592-72

The article was published as article 72 of the book Advanced Topics in Mechanics of Materials, Structures and Construction

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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