What change took places when solid materials are bent?

When solid materials are bent, they undergo a deformation that alters their shape without breaking. This bending can cause internal stress, leading to elastic or plastic deformation depending on the material's properties. In elastic deformation, the material returns to its original shape once the force is removed, while in plastic deformation, the change is permanent. Additionally, the distribution of forces within the material changes, affecting its structural integrity and mechanical properties.