Study on the fracture behavior and characteristics of the interlaminar  interface of FRP sand inclusion pipe

doi:10.19936/j.cnki.2096-8000.20260828.007

Abstract

Abstract: In engineering applications, the interlayer interface between the winding layer and sand-embedded layer in glass fiber reinforced plastic mortar (GRPM) pipes is prone to delamination failure, which reduces the service life of the pipes. An interlayer interface cohesive fracture model was constructed based on in-situ tensile testing to analyze the influence of matrix and weak interface fracture parameters on the evolution of interlayer interface cracks and their mechanical behavior. The results show that although changes in the matrix cohesive parameters do not affect the crack initiation time, their strengthening significantly delays crack propagation, effectively suppressing particle-matrix debonding and interlayer delamination-induced synergistic failure, thereby enhancing overall tensile strength. The coupling effect between the matrix/particle interface and interlayer interface plays a significant role in regulating the crack evolution path. Improving interface strength can shorten the crack length, delay its initiation, and enhance tensile performance. Properly optimizing the interlayer interface also helps to improve the overall mechanical properties and fracture toughness.

Key words: GRPM pipes, interlayer interface failure, cohesive fracture model, mechanical behavior

CLC Number:

TB332

FENG Jianli, WANG Yanchao, LIAN Haikun, SUN Yinghui, WANG Qingzhou. Study on the fracture behavior and characteristics of the interlaminar interface of FRP sand inclusion pipe[J]. COMPOSITES SCIENCE AND ENGINEERING, 2026, 0(8): 52-60.

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Study on the fracture behavior and characteristics of the interlaminar interface of FRP sand inclusion pipe

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