A Review of Delamination Damage of Composite Materials

Abstract

The theoretical and practical achievements in the field of the theory of strength and reliability of composite materials are discussed in a review conducted on the scientific research conducted on the effect of delamination on the reliability and quality of composites. The methodological aspects of the stability of the mechanical characteristics of composite materials under the combined action of cyclic and impact loads are examined, as are the manufacturing and processing technologies. The reasons for delamination, such as technological, manufacturing and application, free edge, joints and loads, are revealed. The influence of delamination on the bearing capacity of structural elements made of composite materials is analyzed. The mechanism of delamination growth is outlined, and the criteria and processes are defined, such as the growth of delamination cracks in a multidirectional laminated plate from a straight edge, edge delamination during plate bending, delamination in plates in the field of residual stresses, etc. The importance of taking into account the visco-plastic effect at the top of the edge crack of delamination of composite materials is emphasized. The concept of critical delamination behavior is characterized, and the issues of delamination stability are described.

Effect of Selective Z-Pinning on the Static and Fatigue Strength of Step Joints between Composite Adherends

“…Furthermore, bonded joints typically exhibit a lower weight than mechanically fastened joints and enable the design of smooth external surfaces. Bonded joints, however, exhibit a high susceptibility to debonding and delamination damage due to the high peeling and shear stresses arising at the ends of the joining interface, as well as the low through-thickness strength of laminated composites [4][5][6]. The initiation and growth of debonding cracks at the joining surface and delaminations at interfaces within the adherends are, therefore, among the main damage modes that lead to the ultimate failure of bonded composite joints.…”

Numerical Investigation of the R-Curve Effect in Delamination of Composite Materials Using Cohesive Elements

“…Delamination refers to the separation of layers within a composite laminate, which can weaken the structure and compromise its integrity. Investigating the problem of delamination is essential because often this type of damage is not visible and can propagate under service loads leading to catastrophic failures, especially in critical components subjected to high mechanical loads and environmental stresses [1]. Understanding the mechanisms and factors influencing delamination is crucial for developing effective preventive measures and design guidelines to ensure the safety and reliability of composite structures in aerospace applications.…”