Tensile Behavior of Kevlar 49 Woven Fabrics over a Wide Range of Strain Rates
Kevlar and other ballistic fabrics are frequently used in dynamic loading applications such as personnel protective equipment (armor) and soft engine containment systems for fan blade out events in aircraft engines. Numerical simulations of these events require constitutive models that are based on mechanical experiments that approximate the load conditions present in the application. Kevlar 49 fabric is tested in tension at strain rates ranging from 10-4 to 1500 s-1. A servohydraulic load frame is used for low strain rate experiments up to 1 s-1. Experiments at strain rates above 400 s-1 are conducted on a direct-tension split Hopkinson bar apparatus. 3D digital image correlation is used to measure specimen surface displacements and strains.
KeywordsDigital Image Correlation Federal Aviation Administration Single Yarn Grip Motion Transverse Yarn
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