Progressive Failure Analysis of Fiber Reinforced Polymer Matrix Composites

Kathavate, V.S.; Pawar, D.N.; Bagal, Nilesh S.; Adkine, A.S.

doi:10.1016/j.matpr.2020.02.070

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…Macroscopic tensile strength of insulation paper relies on fractures and relative slips of molecular chains in cellulose fibres [15]. Paper fibres with a higher polymerisation or orientation will represent a higher tensile modulus, and can provide a great van der Waals' force, resisting slips between cellulose molecules, which means higher fracture probability of cellulose molecular chains than their slipping.…”

Section: Water Content and Degree Of Polymerisationmentioning

confidence: 99%

Insulation degradation and fracture cracks of mechanical impacted thermal‐ageing oil‐impregnated papers

et al. 2022

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In order to elucidate mechanical impacts affecting the insulation strength of thermal‐ageing oil‐impregnated pressboards, we perform mechanical degradation experiments of impacting forces that are represented as the winding‐suffered stresses on thermal‐ageing oil‐paper insulation in transient short‐circuit of transformer. Water content, degree of polymerisation (DP), partial discharge inception voltage and AC breakdown field strength are tested and analysed for diverse thermal‐ageing levels. An analytical model of mechanical degradation is established by relating dielectric breakdown strength to mechanical impact. Mechanical impacts result in less water content in thermal‐aging oil‐impregnated pressboards while causing reduction and increment of DP, respectively, in mildly and severely aged oil‐impregnated pressboards. Partial discharge inception voltage and dielectric breakdown strength vary significantly with the numbers of impact cycles, showing a maximum value under low‐intensity impact and decreasing monotonously under high‐intensity impact. High‐intensity mechanical impacts will evidently exacerbate the thermal deterioration process of oil‐impregnated pressboards, which is primarily attributed to cellulose fibre fractures in pressboard cracks produced by equivalent tensile stress of mechanical impacts. It is acceptable for mildly aged oil‐impregnated pressboards to suffer low‐intensity mechanical impacts that will alleviate insulation degradation by restraining partial discharge in smaller oil‐gaps and prolonging breakdown discharge pathways along impact‐caused cracks.

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Section: Water Content and Degree Of Polymerisationmentioning

confidence: 99%

Insulation degradation and fracture cracks of mechanical impacted thermal‐ageing oil‐impregnated papers

et al. 2022

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“…Dozens of theories have been proposed by researchers at home and abroad, but so far, none of them has succeeded in predicting the entire failure behavior of composites that we can observe. Kathavate et al proposed an incremental failure analysis method using Hashin's criterion 34 . The initiation and propagation mechanisms of the intra‐layer damage mechanisms were identified: matrix stretching, matrix compression, fiber stretching, and fiber compression.…”

Section: Introductionmentioning

confidence: 99%

“…Kathavate et al proposed an incremental failure analysis method using Hashin's criterion. 34 The initiation and propagation mechanisms of the intra-layer damage mechanisms were identified: matrix stretching, matrix compression, fiber stretching, and fiber compression. Stiffness degradation is observed at specific integration points of the material.…”

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confidence: 99%

Failure mode analysis and prediction model of additively manufactured continuous carbon fiber‐reinforced polylactic acid

Yang,

Zhou,

Lin

et al. 2024

Polymer Composites

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Carbon fiber‐reinforced composites are widely used in aerospace, rail transportation, and new energy vehicles due to their small specific gravity as well as good mechanical and chemical properties. Additive manufacturing of continuous carbon fiber‐reinforced polymer composites is an innovative composite manufacturing technique. In this paper, bending and shear specimens with different hatch spacing and layer thicknesses were prepared by fused filament fabrication (FFF) technique and subjected to three‐point bending experiments and interlayer shear experiments, respectively. The results showed that the maximum flexural strength and flexural modulus of the fabricated parts were 383.81 MPa and 41.23 GPa, respectively, and the maximum interlayer shear strength was 13.64 MPa. Finally, an optimized criterion for determining fiber kinking, fiber breakage, and matrix damage was proposed by considering in situ strength variations induced by process parameters. This new model was subsequently validated and could provide a method for fracture predicting of additive manufactured carbon fiber‐reinforced composites.Highlights CCFRC parts with different porosities were prepared by adjusting the layer thickness and hatch spacing. The bending and interlaminar shear damage mechanisms of CCFRC fabrications are revealed, and the effects of layer thickness and hatch spacing on their mechanical properties are investigated. Introduction of additive manufacturing factors to optimize failure models for CCFRC parts. Introduction of additive manufacturing coefficients to accurately predict the interlaminar shear strength of CCFRC parts by AM.

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“…The study revealed that the allowable exposure temperature with desirable tensile stiffness was 200 • C. The mechanical properties of the nanocomposites are of immense significance in engineering applications. Several studies [27][28][29][30] were carried out to tailor the properties of fiber-reinforced and nano composites based on the type and weight fraction of the fillers. Hollaway [31] opined that temperature is a major parameter that influences the behavior of FRP materials.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Performance of Concrete Confinement by MWCNT Modified Epoxy Based Fiber Reinforced Composites

et al. 2022

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The conventional method of fiber reinforced polymer (FRP) wrapping around concrete columns uses epoxy as the binder along with synthetic or natural fibers such as carbon, glass, basalt, jute, sisal etc. as the reinforcement. However, the thermal stability of epoxy is a major issue in application areas prone to fire exposure. The current work addressed this major drawback of epoxy by modifying it with a nanofiller, such as multiwalled carbon nanotubes (MWCNT), and reinforcing it using basalt and sisal fibers. The effect of exposure to elevated temperature on the behavior of concrete cylinders externally confined with these FRP systems was analyzed. Three types of specimens were considered: unconfined; confined with sisal fiber reinforced polymer (SFRP); and confined with hybrid sisal basalt fiber reinforced polymer (HSBFRP) specimens. The test samples were exposed to elevated temperature regimes of 100 °C, 200 °C, 300 °C and 400 °C for a period of 2 h. The compressive strengths of unconfined specimens were compared with various confined specimens, and from the test results, it was evident that the mechanical and thermal durability of the FRP systems was substantially enhanced by MWCNT incorporation. The reduction in the compressive strength of the FRP-confined specimens varied depending on the type of the confinement. After two hours of exposure at 400 °C, the compressive strength corresponding to the epoxy–HSBFRP-confined specimens were improved by 15%, whereas a 50% increase in strength corresponding to MWCNT-incorporated epoxy–HSBFRP-confined specimens was observed with respect to unconfined unexposed specimens. The MWCNT-modified epoxy-incorporated FRP-confined systems demonstrated superior performance even at elevated temperatures in comparison to unconfined specimens at ambient temperatures.

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Progressive Failure Analysis of Fiber Reinforced Polymer Matrix Composites

Cited by 8 publications

References 42 publications

Insulation degradation and fracture cracks of mechanical impacted thermal‐ageing oil‐impregnated papers

Insulation degradation and fracture cracks of mechanical impacted thermal‐ageing oil‐impregnated papers

Failure mode analysis and prediction model of additively manufactured continuous carbon fiber‐reinforced polylactic acid

High Temperature Performance of Concrete Confinement by MWCNT Modified Epoxy Based Fiber Reinforced Composites

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