What are the effects of prolonged compression on the shape of composite materials?

Prolonged compression significantly impacts the shape and performance of composite materials. Over time, continuous compressive forces can lead to permanent deformation, altering the material's original dimensions and structural integrity. This deformation often results from the viscoelastic behavior of the matrix and the realignment of reinforcing fibers.

Additionally, prolonged compression can degrade mechanical properties such as stiffness and strength, as microcracks may develop within the matrix or at the fiber-matrix interface. Environmental factors like temperature and humidity can exacerbate these effects. Understanding these changes is crucial for applications in aerospace, automotive, and construction, where composites endure long-term loads. Proper design and material selection can mitigate adverse effects, ensuring durability and performance.