Failure mechanisms of scarf-repaired composite laminates under tensile load

Baig, Yasir; Cheng, Xiaoquan; Hasham, Hasan Junaid; Abbas, Musharaf; Khan, W. A.

doi:10.1007/s40430-015-0460-z

Cited by 16 publications

(3 citation statements)

References 12 publications

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“…Baig et al [49] compared scarf repaired panels tensile strength between 6° and 10° with prepreg or pre-formed patch. The plates also failed by debonding of the patch, but it was reported that the difference in strength between these two angles was not obvious.…”

Section: Specimens Typologymentioning

confidence: 99%

Bonded flush repairs for aerospace composite structures: A review on modelling strategies and application to repairs optimization, reliability and durability

Orsatelli

Paroissien

Lachaud

et al. 2023

Composite Structures

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Section: Specimens Typologymentioning

confidence: 99%

Bonded flush repairs for aerospace composite structures: A review on modelling strategies and application to repairs optimization, reliability and durability

Orsatelli

Paroissien

Lachaud

et al. 2023

Composite Structures

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“…To date, extensive research has been conducted on the connection properties [42][43][44][45][46][47][48][49][50][51] of traditional composites, [52][53][54][55][56][57][58][59][60][61][62][63][64][65] but few reports have explored the damaged mechanical properties of the connection structure of 3D braided composites with preembedded licker-ins. Furthermore, the damage-triggering mechanism and failure mechanism in near-space complex environments need to be urgently and comprehensively explored.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the mechanical properties of three‐dimensional braided composite circular tubes with preembedded licker‐in

et al. 2023

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This study investigates the tensile and compression properties of three‐dimensional five‐direction (3D5D) braided composite circular tubes with preembedded titanium alloy licker‐ins. The influence of the braided angle, braided thickness, and braided configuration on the bearing capacity is analyzed, and the microdamage morphology and failure mechanism of the tube structure are examined using scanning electron microscopy. Results show that the 3D5D braided tube has a larger tensile failure load than the 3D full five‐direction braided tube of the same outer diameter. In circular tubes of the same braided configuration and outer diameter, the compression failure load increases with the wall thickness, and the C‐ø30t3 circular tube achieves the maximum compression failure load. The damage morphology is characterized by the pulling‐off failure of the licker‐in joint. The T‐ø30t2.5 and T‐ø25t3 circular tubes achieve a large failure load, with an average tensile load of over 120 kN. The failure morphology is characterized by the cracking of the fiber at the end of the tube after the licker‐in joint has been pulled off. The average tensile failure load of the T‐ø30t3 circular tubes is over 105 kN, and the failure morphology reveals a broken licker‐in joint, indicating design deficiencies that require further optimization. The findings of this paper can provide an important scientific basis for the lightweight and high‐strength connection design for 3D braided composites in near‐space aerostats and their flight applications.

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“…These two repair methods have completely different transmission paths and stress distributions due to the different configurations of the adhesive joint surface. The quality of the tapered scarf repair is strongly influenced by the selection of a rational scarf angle, the thickness of the adhesive layer, the shape of the patch, and the design of the reinforcement layer [27][28][29][30][31][32][33][34]. Meanwhile, the patch of the tapered scarf repair is usually in the form of prefabricated components according to the configuration parameters of the scarf shape.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Stepped-Lap Scarf Joint Repair for Spar Cap Damage of Wind Turbine Blade in Service

Chen

Wang

et al. 2020

Applied Sciences

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The objective of this paper was to design configuration parameters for a stepped-lap scarf joint repair, which can be used for spar cap damage of a wind turbine blade in service and to realize the post-repair monitoring. Two experimental studies were included. First, tensile test for the unidirectional tape specimens with a large aspect ratio repaired using a multiple stepped-lap scarf joint method was carried out. The results showed that the reinforcement layer could effectively improve the load-carrying capacity of the repaired zone. The stepped-lap joint surface was identified as the weak part of the spar cap repair, which should be monitored. Second, by embedding carbon nanotube buckypaper sensors on the stepped-lap joint surface of the repaired specimens, quasi-static tensile tests and fatigue tests were carried out. According to the resistance response of the sensors, the quasi-static tensile test confirmed the failure processes, namely the stiffness turning point, damage evolution, crack propagation, and fracture. The fatigue test could accurately identify the progressive failure, namely the initial damage, damage accumulation, initial cracking, and crack propagation to structural failure. The above tests provided an important configuration parameter basis for evaluating the spar cap repair scheme and presented a promising method for the health monitoring of a spar cap after repair.

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Failure mechanisms of scarf-repaired composite laminates under tensile load

Cited by 16 publications

References 12 publications

Bonded flush repairs for aerospace composite structures: A review on modelling strategies and application to repairs optimization, reliability and durability

Bonded flush repairs for aerospace composite structures: A review on modelling strategies and application to repairs optimization, reliability and durability

Experimental study on the mechanical properties of three‐dimensional braided composite circular tubes with preembedded licker‐in

Experimental Study of Stepped-Lap Scarf Joint Repair for Spar Cap Damage of Wind Turbine Blade in Service

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