Abstract
Experimental investigations of channel-section profiles subjected to compression after impacts (20 J and 30 J) leading to global failure are presented. The columns under discussion were made of an eight-layer GFRP laminate with quasi-isotropic, quasi-orthotropic and angle ply arrangements of layers. The profiles were impacted in the corner in three variants: perpendicularly to the flange, at an angle of 45 to the web and perpendicularly to the web. All impact cases were characterized by a high level of absorbed energy (over 75%), which led to a barely visible impact damage, extensive fiber rupture, visible cracks in the laminate or material continuity loss. The load carrying capacity of the profiles degraded by the corner impact always decreases in relation to the not-impacted structures but every case was characterized by stable, postbuckling equilibrium paths. The most dangerous scenario was the corner impact introduced perpendicular to the web.
Highlights
Nowadays different composite structures are very popular in many branches of industry like aircraft industry [1,2], aerospace engineering [3], automotive industry [4] or civil engineering [5,6]
All impact cases were characterized by a high level of absorbed energy, which led to a barely visible impact damage, extensive fiber rupture, visible cracks in the laminate or material continuity loss
There is no constant correlation between the impact angle and the maximum force recorded during the impact
Summary
Nowadays different composite structures are very popular in many branches of industry like aircraft industry [1,2], aerospace engineering [3], automotive industry [4] or civil engineering [5,6]. The objective of the diligently research was to find the answer to the question whether, in case of impact degradation, a thin‐ walled structure will retain a stable equilibrium path in postbuckling state (if such state will exist) or the post‐impact damage will lead to general strength reduction of the composite and the structure will reach load carrying capacity before losing stability. The objective of the undertaken research was to find the answer to the question whether, in case of impact degradation, a thin‐ walled structure will retain a stable equilibrium path in postbuckling state (if such state will exist) or the post‐impact damage will lead to general strength reduction of the composite and the structure will reach load carrying capacity before losing stability
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