– This paper aims to present a new robustness-based design strategy for thin-walled composite structures under compressive loading, which combines strength requirements in terms of the limit and ultimate load with robustness requirements evaluated from the structural energy until collapse.
– In order to assess the structural energy, the area under the load-shortening curve between several characteristic points such as local buckling, global buckling, onset of degradation and collapse load is calculated. In this context, a geometrically nonlinear finite element analysis is carried out, in which the ply properties are selectively degraded by progressive failure.
– The advantage of the proposed methodology is observed by analyzing unstiffened composite plates under compressive loading, wherein the lightest plate that satisfies both strength and robustness requirements can be attained.
– As a practical implication, this methodology gives a new argument to accept the collapse load close to the ultimate load once robustness is ensured.
– The structural energy is employed to investigate the robustness of thin-walled composite structures in postbuckling, and new energy-based robustness measures are proposed. In the design of composite structures, this innovative strategy might lead to a more robust design when compared to an approach that only accounts for the ultimate load.
A robustness-based design strategy for composite structures
Aircraft Engineering and Aerospace Technology: An International Journal ; 86 , 4 ; 274-286
2014-07-01
13 pages
Article (Journal)
Electronic Resource
English
A robustness-based design strategy for composite structures – probabilistic approach
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