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Pseudo-ductile Fracture in Grid Stiffened Structure by Automated Fibre Placement by Cong Zhao; Matthew J. Donough; B. Gangadhara Prusty; Jun Xiao; Laishui Zhou; Luling An is a Engineering article available to read on EtoBox.

What is Pseudo-ductile Fracture in Grid Stiffened Structure by Automated Fibre Placement about?

Pseudo-ductile fracture in composite structures is desirable which can provide a window of detection for structural anomaly. Several design strategies had been investigated to induce pseudo-ductile fracture in thin composite laminates. However, the thickness of load bearing structures such as the grid stiffeners in advanced grid structures are ranged up to 30 mm. This paper presents an investigation into introducing pseudo-ductile fracture into a grid stiffener of representative thickness by implementing cut-tow design at the grids’ intersection. Automated fibre placement permits the cutting, terminating and restarting layup of a tow which makes this design feasible. Experimental and numerical results showed the benefits of a cut-tows design is twofold. Firstly, improvements up to 42.4 % was achieved in mechanical strength due to the reduction in tow waviness at the grid’s intersection. By varying the ratio and distribution of cut-tows, it is possible to achieve additional 55.9 % of pseudo-ductile displacement before fracture in thick section grid stiffeners under tension and bending loads. The enabling mechanism of pseudo-ductile fracture are discussed further using numerical mode

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Author

Cong Zhao; Matthew J. Donough; B. Gangadhara Prusty; Jun Xiao; Laishui Zhou; Luling An

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)