For specific recommendations, more info would be beneficial. In general, any journal that accepts letter-type articles would be fast. Check www.scimagojr.com and search through some journals. I hope this helps.
Hi Andreza, You can try MDPI journals if you need a fast publication, but these journals are open access so you need to pay the fee after acceptance of the paper.
Composite Structures are quite active and take around 4 months to get published. This information is based on my recent observations of the works they published.
Most of the renowned journals are very fast and quickly, such as Composite structure, Computational Materials Science, Composite Part B: Engineering, Composite Structure, Journal of Intelligent material and Structure, Structures, International journal of engineering science, mechanics research communication and European journal of mechanics- A solids.