Design of a new pneumatic impact actuator of a Split Hopkinson Pressure Bar (SHPB) setup for tensile and compression testing of structural adhesives

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Tenreiro, AFG (Author) Other; Silva, CM (Author) Other; António Mendes Lopes (Author) FEUP; Nunes, PDP (Author) Other; Ricardo Carbas (Author) FEUP; da Silva, LFM (Author) FEUP

Journal

Title: Mechanism and Machine Theory

Vol. 159

ISSN: 0094-114X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 11 Citations

Other information

Authenticus ID: P-00T-JT7

DOI: 10.1016/j.mechmachtheory.2021.104289

Abstract (EN): Adhesive joining became a common manufacturing technique for joining materials, particularly in the automobile and aerospace industries. However, only recently the scientific community started to study the mechanical behavior of bonded joints, having in mind impacts and high strain-rate solicitations. As such, a new architecture for a Split Hopkinson Pressure Bar (SHPB) test machine is proposed to test adhesive bulk, as well as, Mode I, Mode II and Mixed-Mode adhesive joint specimina. This paper presents a novel pneumatic actuation system for the SHPB machine, able to reach velocities of roughly 25 m s(-1) (or 90 km h(-1)). These velocity requirements are deduced from mathematical models describing the behavior of the specimina under SHPB testing. The actuator dynamics is assessed by means of a functional numerical simulation, involving the mechanical and fluid dynamics. The model includes details such as the reservoir and pneumatic valves, thermodynamic behavior of the pneumatic chambers, and the air leakage due to the absence of physical contact between the static and moving components. Additionally, the mechanical design of the non-conventional actuator is discussed, highlighting construction details.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 22