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<p>The shear response of polyurethane foam core carbon fiber epoxy sandwich was evaluated. The foam slabs were cast and three types of specimen were molded as plain foam, resin coated foam and composite skin bonded sandwich foam. The dimensions were maintained and experimental Iosipescu testing was carried out using ASTM standard test procedure. Mirror 45° notches were made and shear tests were conducted using universal test machine. Three dimensional finite element model was developed and analyzed using ANSYS software. Based on the numerical analysis, the stress strain behavior was simulated for different configurations. The interface stresses were plotted in between the notches involving the composite facesheets and the foam core. The shear strains at ±45° to the specimen axis and in between the notches were measured. By comparing the composite sandwich foam sample with plain foam 20% decrease in the displacements, 16.8 times increase in load-carrying capacity and 21 times increase in shear strength is noticed. Optical microscope inspection is done and shear cracks in foam core are noticed; no fiber fracture is seen in the composite.</p>

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Experimental and Numerical Studies of Shear Behavior in Notched PU Foam Composite Sandwich

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Rajesh Addanki,
  • Sanjay Anand Rao Khalane

摘要

The shear response of polyurethane foam core carbon fiber epoxy sandwich was evaluated. The foam slabs were cast and three types of specimen were molded as plain foam, resin coated foam and composite skin bonded sandwich foam. The dimensions were maintained and experimental Iosipescu testing was carried out using ASTM standard test procedure. Mirror 45° notches were made and shear tests were conducted using universal test machine. Three dimensional finite element model was developed and analyzed using ANSYS software. Based on the numerical analysis, the stress strain behavior was simulated for different configurations. The interface stresses were plotted in between the notches involving the composite facesheets and the foam core. The shear strains at ±45° to the specimen axis and in between the notches were measured. By comparing the composite sandwich foam sample with plain foam 20% decrease in the displacements, 16.8 times increase in load-carrying capacity and 21 times increase in shear strength is noticed. Optical microscope inspection is done and shear cracks in foam core are noticed; no fiber fracture is seen in the composite.