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The failure load, failure mode, and progressive damage processes of carbon-glass hybrid composite bolted connection structures were studied by using the method of experiments and numerical simulations. Based on the ABAQUS platform, the finite element models of 36 different types of connection structures with various width to diameter ratios(W/D) and end to diameter ratios(E/ D) were established. According to the three-dimensional Hashin failure criterion and Chang-Chang failure criterion, the effects of structural dimensions E/D and W/D on the failure load and failure mode were analyzed, combined with the findings of the tensile tests. The impacts of E/D and W/D on the failure load and failure mode of the connection structures and the progressive damage processes of the connection structures under various failure modes were discussed. The results show that the failure modes of the carbon-glass hybrid composite bolted connection structures with a specific hybrid ratio include bearing failure, shear-bearing failure, and tensile failure. The structural dimensions E/D and W/D have a greater impact on the failure load and failure mode. The bearing failure mode of the connection structures is that the matrix of the laminated plates are damaged at the axis position on the extruding side of the bolt holes, and the failure extends outward in a sector shape along the axis to the structure failure. The shear-bearing failure mode is that a large number of fiber and matrix tensile damage occur from the bolt holes to the end face of the laminated plates, with the matrix bearing damage at the compression side of the bolt holes, generating a notch to the structural failure. The tensile failure mode is that the fiber and matrix tensile damage occurs at the upper and lower positions of the bolt holes of the laminates, and extends laterally to the upper and lower sides of the laminates, resulting in structural failure. [ABSTRACT FROM AUTHOR]

Objective To explore the surgical technique of a modified Onizuka cheiloplasty for repairing the unilateral cleft lip. Methods 24 patients with unilateral cleft lip were repaired by modified Onizuka cheiloplasty. The rotation flap ended at the midpoint of nasal columella crease. A small triangle skin flap was formed above the vermilion border of the advancement flap. The small triangle flap was inserted to the medial side after the Cupid's bow was built. The skin of the flap C was denuded along the nasal columella crease and the muscle was sutured to the alar base for augmentation of nostril floor on the cleft side. The tip of the advancement flap was sutured at the midpoint of nasal columella crease and the skin of nasal floor was trimmed to hide the incision line around the nasal columella base. Results It was found that the Cupid's bow was rebuilt in a natural form and the configuration of the upper lip was reconstructed symmetrically. The long term follow up studies showed that the philtrum column was not disturbed by the small triangle flap and the nasal floor was rebuilt without obvious scars. Conclusion The modified Onizuka cheiloplasty is an easy learning technique and efficient for repairing the unilateral cleft lip. This technique can satisfy the patients by reducing the length of scar as well as rebuilding a natural form of upper lip and nostril floor [ABSTRACT FROM AUTHOR]

Objective: To explore the surgical technique of a modified Onizuka cheiloplasty for repairing the unilateral cleft lip., Methods: 24 patients with unilateral cleft lip were repaired by modified Onizuka cheiloplasty. The rotation flap ended at the midpoint of nasal columella crease. A small triangle skin flap was formed above the vermilion border of the advancement flap. The small triangle flap was inserted to the medial side after the Cupid's bow was built. The skin of the flap C was denuded along the nasal columella crease and the muscle was sutured to the alar base for augmentation of nostril floor on the cleft side. The tip of the advancement flap was sutured at the midpoint of nasal columella crease and the skin of nasal floor was trimmed to hide the incision line around the nasal columella base., Results: It was found that the Cupid's bow was rebuilt in a natural form and the configuration of the upper lip was reconstructed symmetrically. The long term follow up studies showed that the philtrum column was not disturbed by the small triangle flap and the nasal floor was rebuilt without obvious scars., Conclusion: The modified Onizuka cheiloplasty is an easy learning technique and efficient for repairing the unilateral cleft lip. This technique can satisfy the patients by reducing the length of scar as well as rebuilding a natural form of upper lip and nostril floor.