In situ thermal diffusivity determination of anisotropic composite structures: Transverse diffusivity measurement

Zacharia, Sanjith G.; Siddiqui, A.O.; Lahiri, Jhumur

doi:10.1016/j.ndteint.2012.01.009

Cited by 8 publications

(2 citation statements)

References 6 publications

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“…The dissipation rate seems to be stable for a particular stress level and increases above that, showing a threshold or fatigue limit level for the chosen test specimen. Zacharia et al 38 have experimented on CFRP composite shells by determining the transverse thermal diffusivity.…”

Section: Introductionmentioning

confidence: 99%

“…This can be further extended to quantify the damage by a dissipation variable 'D' = 1-[T (@ zero stress) / T (@ applied stress)] [34]. Zacharia et al (2012) [36] have experimented the possibility of determining the transverse thermal diffusivity of CFRP composite shells under ambient conditions. The diffusivity of the test specimens is calculated by Parker's, Cowan, Clark & Taylor's rule.…”

Section: Introductionmentioning

confidence: 99%

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Structural integrity evaluation of cyclic loading Glass Fibre Reinforced Polymer composite by acoustic emission and heat transfer

Govindaraman¹,

Kalidas²,

Bari

et al. 2022

Journal of Composite Materials

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GFRP composites experience structural changes like matrix cracking, debonding, delamination, and fibre failure on static and dynamic loading. In this work, composites with varying fibre orientation interaction angle and volume fractions are prepared and exposed to cyclic load. The cyclic load (R = 0) is a constant amplitude flexural load imposed on the cantilever beam specimen with varying frequencies (2.6, 4.6, 8.6 Hz) and cycles (up to 44 × 103). The structural integrity of the specimens on loading is examined in terms of Flexural, modulus, Acoustic Emission (AE) and heat transfer changes. The drop in flexural modulus is minimum in higher Vf = 32% laminate (A1 = 7.01%, B1 = 1.86%) than the lower Vf = 25% (A2 = 19.86%, B2 = 8.6%). The observed AE peak frequency for the induced damages is in the range of 50–100, 110–230, 245–380 kHz. The drop-in fibre volume fraction has a significant role in laminate with lower fibre interaction (Type A) to offer minimum variation (5.25%) in AE activity count which is the opposite in laminates with higher fibre interaction angle (31.75%). The step heat thermography exhibits minimum temperature difference (∆T) for moderate loading frequency and in a few cases, ∆T drops well below the virgin, insisting on in situ thermography to study the dynamic changes in composites. A fibre dominant behaviour can be observed with minimum variation in AE activity in a lower fibre interaction angle. Thus, the fibre orientation angle and fibre volume fraction have a significant role in the retention of the structural integrity of composites in dynamic loading.

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Section: Introductionmentioning

confidence: 99%