Interlaminar interface damage and mechanical properties of glass fiber⁃reinforced plastic mortar pipe

doi:10.19491/j.issn.1001-9278.2025.08.011

Abstract

Abstract:

This study investigates interlayer interface failure mechanisms and mechanical properties of fiberglass⁃reinforced plastic mortar （FRPM） pipes through in⁃situ tensile testing coupled with scanning electron microscopy （SEM） and digital image correlation analysis. Experimental results indicated that failure primarily occurred through interlayer interface damage and localized cracking. Real⁃time SEM observations demonstrated a progressive failure sequence：（1） initial debonding of large， convex particles at the near⁃interface region，（2） subsequent particle interactions in adjacent areas， and （3） extensive particle/matrix interface debonding propagating into the resin matrix， ultimately causing interlayer separation. Notably， far⁃interface particles showed minimal influence on crack initiation. Digital image analysis further indicated that while far⁃interface domains experienced negligible debonding， near⁃interface regions developed significant particle/matrix separation， where continuously increasing strain fields initiated and propagated cracks. Under increasing tensile strain， specimens exhibit non⁃uniform strain distribution， with maximum strain concentration occurring in near⁃interface particle zones. Quantitative analysis established the critical damage region within 735~940 pixels from the interface.

Key words: fiberglass reinforced plastic mortar pipe, interlaminar interface, mechanical property, in?situ tensile test, digital image processing

CLC Number:

TQ320.6

HU Lizhou, SUN Yinghui, JIA Yingjie, WANG Qingzhou. Interlaminar interface damage and mechanical properties of glass fiber⁃reinforced plastic mortar pipe[J]. China Plastics, 2025, 39(8): 69-74.

Figures/Tables 12

Fig.1. Schematic diagram of the fiberglass reinforced plastic mortar pipe

层名	原材料	厚度/mm	树脂含量/%
内衬层1	胶衣、玻璃纤维表面毡、无碱针织毡、化纤网格布、聚磷酸铵阻燃剂和间苯型树脂及辅助材料等	1.5	≥90
外缠绕层2、8（1层环向缠绕+2层交叉缠绕）	玻璃纤维无捻粗纱、缠绕纤维、邻苯型树脂及辅助材料等	2.0	15~25
树脂夹砂层3、5、7	石英砂、树脂及辅助材料、兜纱布等	14.0	≥25
内缠绕层4、6（1层环向缠绕+1层交叉缠绕）	玻璃纤维无捻粗纱、缠绕纤维、邻苯型树脂及辅助材料等	1.2	15~25

Tab.1. Material composition and parameter requirements of each layer

Fig.2. Experiment process

Fig.3. Stretching stress⁃strain curve of the specimen

Fig.4. Meso⁃failure under different strains at the interlayer interface

Fig.5. Deformation locus of particles/matrix near the interface

Fig.6. Gray level distribution of surface to be measured of the test piece

Fig.7. Speckle quality statistics of the SEM image

Fig.8. ROI calculation area

Fig.9. 2D and 3D strain cloud maps along x⁃direction under different strain

Fig.10. Interlayer interface damage failure

Fig.11. Interface area size⁃ε¯xx curves

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