In the realm of composite materials, understanding stress distribution is paramount, especially when it comes to critical applications in the energy sector. A recent study published in *Jixie qiangdu* (which translates to *Mechanical Strength*) has shed new light on this very topic, offering insights that could revolutionize the design and optimization of composite laminates.
The research, led by QING Guanghui, delves into the intricate world of interlaminar stress analysis. Composite laminates, widely used in industries like aerospace, automotive, and energy, often face stress concentration issues, particularly around holes. These stress concentrations can lead to structural failures, making it crucial to understand and mitigate them.
QING Guanghui and his team employed the generalized mixed variational principle to establish a model for laminated plates with various stacking modes. They divided the stress field variables into interlaminar stress and in-plane stress, introducing stress boundary conditions to ensure the physical continuity of interlaminar stresses between layers and the discontinuity of in-plane stresses between layers.
The study’s findings are significant. “The incompatible generalized mixed element could obtain more accurate stress singularity results than the 8-node three-dimensional solid incompatible displacement element results solved by the finite element software Abaqus,” QING Guanghui explained. This means that the new model can more effectively capture the high stress gradient of the interlaminar stresses at the edge of the laminated plate hole.
The implications for the energy sector are substantial. Composite laminates are used in various energy applications, from wind turbine blades to oil and gas pipelines. Understanding and accurately predicting stress distributions can lead to better designs, improved safety, and increased efficiency.
Moreover, the research provides a new idea for the optimal design of laminates. As QING Guanghui put it, “The research indicates that compared with the displacement element, the incompatible generalized mixed element can more effectively capture the high stress gradient of the interlaminar stresses at the edge of the laminated plate hole.”
This study, published in *Jixie qiangdu*, marks a significant step forward in the field of composite materials. It offers a new tool for engineers and designers, one that could shape the future of composite laminate applications in the energy sector and beyond. As the industry continues to evolve, such advancements will be crucial in meeting the demands for safer, more efficient, and sustainable energy solutions.