Micromechanics of Fracture Propagation During Multistage Stress Relaxation and Creep in Brittle Rocks

Zafar, Sana; Hedayat, Ahmadreza; Moradian, Omid

doi:10.1007/s00603-022-03045-w

Cited by 16 publications

(1 citation statement)

References 68 publications

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“…Acoustic emission (AE) and digital image correlation (DIC) [18][19][20] is a nondestructive testing method to characterize the fracture process of composite materials. Acoustic emission 21 technology mainly detects the development of internal failures, and DIC 22 uses strain cloud maps to observe the failure patterns and failure characteristics of the surface. Yeran et al 23 combined AE technology and DIC method to study the dynamic damage process and bending response of woven spacer structure reinforced sandwich composites (WSRS).…”

Section: Introductionmentioning

confidence: 99%

Research and prediction of creep behavior of triaxial warp‐knitted composites by time–temperature equivalent principle

You,

Gao,

et al. 2023

Polymer Composites

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In this paper, the creep behavior of triaxial warp‐knitted composites (TWKC) was investigated. The TWKC specimens were prepared by applying vacuum‐assisted resin infusion (VARI), and the three‐point bending creep experiments at different temperatures were carried out. The shift factor was calculated based on the activation energy method, and the creep curve at 25°C within 105s was obtained according to the time–temperature equivalence principle, the time–temperature equivalent model was established, and the model was verified by measuring the long‐term creep data with self‐made instrument. There is approximately agreement between the prediction result and experimental one, which is less than 10% within 105s. The results show that the model could be used to predict the creep behavior of TWKC. The viscoelastic properties of the specimen were analyzed based on dynamic mechanical analysis (DMA), and the creep behavior of TWKC was further analyzed by acoustic emission and digital image correlation damage analysis.Highlights The viscoelasticity of TWKC was analyzed based on dynamic mechanical analysis (DMA), and the activation energy was calculated. Based on the activation energy method, the time–temperature equivalent model was established to predict the creep behavior of TWKC. The creep behavior of TWKC were further analyzed by acoustic emission (AE) and digital image correlation (DIC) damage analysis.

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