A new fixture for fracture tests under mixed mode I/III loading

Ayatollahi, M.R.; Saboori, Behnam

doi:10.1016/j.euromechsol.2014.09.012

Cited by 87 publications

(36 citation statements)

References 32 publications

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“…Unlike other available complex test methods [30,31,33,44,45], K Ic and K IIIc were obtained easily using this very simple specimen just by rotating the crack direction with respect to the applied load line.…”

Section: Discussionmentioning

confidence: 99%

“…One possible reason for this shortcoming can be related to the difficulties that exist for testing the cracked sample under pure mode III. A review of literature shows that some limited specimens including the bar containing either circumferential crack or V and U notches subjected to torsion [25][26][27][28][29], the inclined cracked compact tension specimen [30,31], the inclined edge cracked bend beam [32] and the new edge cracked plate test configuration loaded by a special pin loading fixture which has been suggested recently by Ayatollahi and Saboori [33] are only able to produce the out of-plane deformation in the flanks of a crack. However, in practice the influence of other deformation modes (i.e.…”

Section: Accepted Manuscriptmentioning

confidence: 98%

“…Saboori's specimen [33] that can produce pure mode III deformation, require special fixtures that makes the fracture experiments noticeably expensive, difficult and complicated. Therefore, the lack of a simple and suitable test specimen for obtaining mode III fracture toughness (K IIIc ) of materials is one of the major shortcomings in this field.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Determination of mode III fracture toughness for different materials using a new designed test configuration

2015

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Section: Discussionmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 98%

Section: Accepted Manuscriptmentioning

confidence: 99%

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Determination of mode III fracture toughness for different materials using a new designed test configuration

2015

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“…To study the mixed mode I/III fracture of brittle and ductile materials, a few out‐of‐plane fixtures were proposed by researchers . Using a combination of an out‐of‐plane fixture and an in‐plane (Arcan) fixture, a new fixture to apply a full combination of mixed mode I/II/III loading is introduced (see Figure ).…”

Section: Novel Loading Devicementioning

confidence: 99%

A novel fixture for mixed mode I/II/III fracture testing of brittle materials

Zeinedini

2018

Fatigue Fract Eng Mat Struct

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A novel test‐loading device was suggested in order to study the fracture behavior of brittle materials under mixed mode I/II/III loading conditions. A version of the compact tension shear specimen was used as the test configuration. Using a three‐dimensional finite element analysis, the influence of mode mixity on the stress intensity factors, the T‐stress, and 3‐D plastic zone around the crack tip was investigated. In addition, an experimental study was performed on an epoxy polymer using the proposed setup. Finally, the fracture toughness of pure epoxy was measured under several loading conditions. The numerical and experimental results manifested that the proposed setup is able to determine a full range of mixed mode I/II/III fracture properties. At the end, the fracture envelope obtained using the practical study was compared with various three‐dimensional fracture criteria. A negligible discrepancy was concluded between the practical data and the theoretical data estimated by the maximum mean principle stress criterion.

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“…the CNTs performance under in‐plane mixed mode loading is investigated using the four point bend specimen. Regarding the case of spatial mixed mode loading, there is only one research dealing with mixed mode I/III using a configuration presented by Ayatollahi and Saboori . Some other mixed mode I/III test configurations can also be found in Refs …”

Section: Introductionmentioning

confidence: 99%

Experimental fracture investigation of CNT/epoxy nanocomposite under mixed mode II/III loading conditions

Karami

Ayatollahi

Saboori

2020

Fatigue Fract Eng Mat Struct

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For the first time, the brittle fracture of epoxy‐based nanocomposite reinforced with MWCNTs (multi‐walled carbon nanotubes) and subjected to mixed mode II/III loading conditions is investigated. This experimental investigation is carried out using a newly developed test configuration. Araldite LY 5052 epoxy, which is a resin frequently used in aerospace industry, is utilized to fabricate pure epoxy and nanocomposite test specimens with two different MWCNTs contents of 0.1 and 0.5 wt%. The obtained experimental results reveal that adding MWCNTs to epoxy resin up to 0.5 wt% improves the fracture toughness under pure mode II and pure mode III loading with an increasing trend. This is while the improvement under mixed mode II/III loading is reduced by adding nanotubes more than 0.1 wt%. To justify the variations of fracture toughness in terms of nanoparticles content, SEM (scanning electron microscopy) photographs of the fracture surfaces of the specimens in the vicinity of the initial crack front are prepared. Additional fracture mechanisms caused by adding carbon nanotubes are discussed in detail based on the provided SEM images.

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A new fixture for fracture tests under mixed mode I/III loading

Cited by 87 publications

References 32 publications

Determination of mode III fracture toughness for different materials using a new designed test configuration

Determination of mode III fracture toughness for different materials using a new designed test configuration

A novel fixture for mixed mode I/II/III fracture testing of brittle materials

Experimental fracture investigation of CNT/epoxy nanocomposite under mixed mode II/III loading conditions

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