: The primary objective of the program was the determination of the stress and strain fields in those local regions adjacent to the particulate fillers in matrix composites Not only is the general mechanical behavior best understood on this microstructural level, but subsequent attainment of critical values of stresses and strains can be incorporated in an appropriate condition of failure (Author)

Mechanics of Composite Materials.

A review on works that investigate the mechanical behaviour of variable stiffness composite laminated panels is carried out in this paper. The review mostly focuses on buckling, failure and vibrati...

A review on the mechanical behaviour of curvilinear fibre composite laminated panels

https://escholarship.mcgill.ca/downloads/4j03d372k

Optimization of variable stiffness composites with embedded defects induced by Automated Fiber Placement

Automated fibre placement based composite structures: Review on the defects, impacts and inspections techniques

https://cronfa.swan.ac.uk/Record/cronfa31726/Download/0031726-24012017093924.pdf

Metamodel based high-fidelity stochastic analysis of composite laminates: A concise review with critical comparative assessment

http://mdog.mcgill.ca/paper%20pdf%20to%20upload/Defect%20layer%20method.pdf

Defect layer method to capture effect of gaps and overlaps in variable stiffness laminates made by Automated Fiber Placement

http://mdog.mcgill.ca/paper%20pdf%20to%20upload/Surrogate-based%20multi-objective%20optimization%20of%20a%20composite%20laminate.pdf

Surrogate-based multi-objective optimization of a composite laminate with curvilinear fibers

A comparative study of metamodeling methods for the design optimization of variable stiffness composites

Fused Filament Fabrication (FFF), one of the most popular processes of 3D printing, offers flexibility in manufacturing and introduces anisotropic properties to the final parts. With the use of Curvilinear Variable Stiffness (CVS) 3D printing technology, mechanical properties of the manufactured products can be further improved and optimized. In this work, we demonstrate how CVS design can improve open-hole tensile strength and failure strain of the manufactured specimens per ASTM D5766. In addition, the ratio of the specimen width to the hole diameter is considered as a design parameter and investigated. It is found that CVS design improves the failure strength by 38.0% for a larger hole diameter configuration (from 48.0 MPa to 66.2 MPa), while the improvement in failure strain (from 0.0125 mm/mm to 0.0130 mm/mm) is limited to only 4.0%. On the other hand, for a smaller hole diameter case, a substantial improvement of 52.5% in failure strain is obtained with the use of CVS design (from 0.0141 mm/mm to 0.0215 mm/mm), while 16.7% improvement in failure stress (76.0 MPa to 88.6 MPa) is less pronounced.

Mahdi Arian Nik

Papers

Optimization of variable stiffness composites with embedded defects induced by Automated Fiber Placement

Defect layer method to capture effect of gaps and overlaps in variable stiffness laminates made by Automated Fiber Placement

Surrogate-based multi-objective optimization of a composite laminate with curvilinear fibers

A comparative study of metamodeling methods for the design optimization of variable stiffness composites

Curvilinear variable stiffness 3D printing technology for improved open-hole tensile strength