Mode I (GIC) Fracture Toughness of Composite Sandwich Structures for Use in Damage Tolerance Design and Analysis: Volume II: Fatigue Testing, including Effects of Fluid Ingression
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Mode I (GIC) Fracture Toughness of Composite Sandwich Structures for Use in Damage Tolerance Design and Analysis: Volume II: Fatigue Testing, including Effects of Fluid Ingression

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      This report, Volume II, contains results of Mode I fatigue testing of composite sandwich structures. This report is the second of a set of three volumes. The first volume contained results of Mode I static testing, and the third volume will contain supplemental results of Mode I static testing of sandwich variables not tested in Volume I. In this volume, the influence of sandwich parameters, such as facesheet thickness, core type, cell size, and core density, on the onset and damage growth rate of sandwich composites was investigated using single-cantilever beam fatigue testing for Mode I fracture toughness of the core-facesheet disbond. To investigate the influence of fluid ingression and entrapped fluids in sandwich structures, test specimens were conditioned in a hydraulic oil (Skydrol®) and water mixture. In general, fluid-ingressed specimens experienced faster crack growth than baseline specimens. The information gathered through this research will be instrumental in developing analytical methods and validating finite element analysis procedures to further investigate the damage growth mechanics in composite sandwich structures. The data can also be used in design for composite sandwich structures constructed of similar materials and geometries tested here.
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