Fracture criterion for notched thin composite laminates

Vaidya, Rajesh S.; Sun, C. T.

doi:10.2514/3.13503

Cited by 10 publications

(12 citation statements)

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“…For the measurement of the intralaminar fracture toughnesses for fiber tensile failure, the compact tension (CT) specimen, originally developed for the fracture toughness characterization in metals [11,12], is commonly used [13, 14,15,16,17,18,19]. In contrast to the centre-notched (CN) [20,21,22,23,24,25,26], the 10 double-edge notched (DEN) [27,28,29] and the four-point bending (4PB) [27] specimens, the CT specimen shows a stable crack propagation, which enables the determination of the R-curve. Unfortunately, the CT specimen has several limitations: i) the tendency of buckling/twisting at the back side (because of the reduced thickness of the specimen [30] or because of the high load that occurs 15 especially when testing high toughened material systems [31]); ii) failure at the back side (because the compressive stress reaches the compressive strength of the material); and iii) failure at the load introduction point.…”

Section: Introductionmentioning

confidence: 99%

Determination of the crack resistance curve for intralaminar fiber tensile failure mode in polymer composites under high rate loading

Kühn

Catalanotti

Xavier

et al. 2018

Composite Structures

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Koerber, H. (2018). Determination of the crack resistance curve for intralaminar fiber tensile failure mode in polymer composites under high rate loading. Composite Structures, 204, 276-287. https://doi.Abstract This paper presents the determination of the crack resistance curve of the unidirectional carbon-epoxy composite material IM7-8552 for intralaminar fiber tensile failure under dynamic loading. The methodology, proposed by Catalanotti et al. [1] for quasi-static loading conditions, was enhanced to high rate

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Section: Introductionmentioning

confidence: 99%

Determination of the crack resistance curve for intralaminar fiber tensile failure mode in polymer composites under high rate loading

Kühn

Catalanotti

Xavier

et al. 2018

Composite Structures

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“…51 The calculated value of mode-II fracture energy G IIc is lower than the measured value of 0.51 kJ/m 251 for the same crack configuration, but close to the value of 0.150 kJ/m 2 that was evaluated on the basis of the splitting growth in cross-ply laminates. 52 Off-axis apparent equivalent mode-I fracture toughness…”

Section: Off-axis Intrinsic Equivalent Mode-i Fracture Toughnessmentioning

confidence: 99%

Anisotropic size effect law for notched strength of unidirectional carbon/epoxy laminates – Part 2: Comparison with experiment

Kawai

Kasuga

2016

Journal of Composite Materials

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The multiaxial quasi-brittle failure criterion for notched orthotropic composites that was formulated in the first part of this study is evaluated on the basis of the off-axis notched strength of a unidirectional carbon/epoxy composite. Static tension tests are first carried out on center circular hole specimens of different hole diameters and fiber orientations to examine the notch size effect as well as the fiber orientation effect on the off-axis notched strength of the unidirectional composite. Experimental results show that the tensile strength in the fiber direction is more notch-sensitive than that in the transverse direction. The notch sensitivity in off-axis strength increases as the off-axis angle increases from the 0 fiber direction to about 10 off-axis direction, but it turns to decrease monotonically as the off-axis angle increases further in the range up to 90 . Then, the analytical formulas to predict the off-axis notched strength, off-axis notch sensitivity, off-axis intrinsic equivalent mode-I fracture toughness, and off-axis apparent equivalent mode-I fracture toughness of unidirectional composites are established on the basis of the multiaxial quasi-brittle failure criterion. These analytical formulas succeed in efficiently predicting both the effects of notch size and fiber orientation on the off-axis notched strength of the unidirectional composite. It is also shown that the intrinsic and apparent off-axis equivalent mode-I fracture toughness values predicted for brittle failure and quasi-brittle failure, respectively, correlate well with the experimental results.

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“…These architectures are described in the text by [1]. Failure criteria for strength prediction can be roughly divided into three categories; stress or strain based criteria, [2][3][4], energy based criteria, [5][6][7][8] and a combination of stress and energy criteria, [9][10][11][12][13]. The challenge to the classical stress based criteria occurs from structural configurations that fail in the presence of stress gradients.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on cross-ply woven textile composite with notches and cracks

Thorsson

Waas

2015

Composite Structures

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Fracture criterion for notched thin composite laminates

Cited by 10 publications

References 0 publications

Determination of the crack resistance curve for intralaminar fiber tensile failure mode in polymer composites under high rate loading

Determination of the crack resistance curve for intralaminar fiber tensile failure mode in polymer composites under high rate loading

Anisotropic size effect law for notched strength of unidirectional carbon/epoxy laminates – Part 2: Comparison with experiment

Experimental and numerical study on cross-ply woven textile composite with notches and cracks

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