The formation mechanism of gradient properties and the regulation mechanism of elastic properties in three‐dimensional tubular braided composites

Abstract Three‐dimensional tubular braided composites (3DTBCs) have mitigated delamination issues typical of laminated composites, gaining wide industrial application. However, their intricate internal fiber architecture, influenced by processing techniques, leads to continuous property variations, resulting in localized stress concentrations that can cause premature component failure and significantly impact performance. This paper introduces a field theory‐based quantitative analysis method for property gradients and investigates their formation mechanism. Additionally, it explores the effects of braiding parameters on property gradients. The described analysis method enables the prediction of gradient structures and associated strength distributions, offering potential pathways for maximizing the strength of 3DTBC. Highlights The mesostructure and mechanical properties of three‐dimensional braided tubular composites inherently exhibit unavoidable gradient distributions. The performance gradient can be quantitatively described using field theory‐based analytical methods. The motion trajectory of the yarn carrier is the primary cause of the property gradient. The property gradient can be controlled by adjusting the braiding process parameters.