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<p>An integrated experimental-numerical program quantified the effect of tensile pre-damage on the compressive strength of open-hole laminates and estimated an allowable tensile preload using a piecewise-linear interpolation. Specimens were tension-preloaded at 34 and 39 kN to bracket damage initiation and propagation, inspected by thermal de-ply, and then tested in compression. A tensile preload of 39 kN (≈73% of the ultimate tensile load) reduced the residual compressive strength by 19.4% relative to pristine open-hole specimens. A finite-element model predicted failure loads within 5% error and elucidated the coupled roles of fiber bending, matrix damage, and delamination in governing residual capacity. Based on residual capacities at 0, 34, and 39 kN, the allowable preload was estimated as 34.5 kN for retaining ≥95% of the pristine capacity (36.1 kN for ≥90%).</p>

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Estimating an Allowable Tensile Preload for Open-hole CFRP Laminates Under Subsequent Compression: Experiments and Validated FE Modeling

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • J. G. Liu,
  • L. S. Liu,
  • Q. F. Duan,
  • P. Qi,
  • Y. Ma,
  • W. L. Yu,
  • M. Sun

摘要

An integrated experimental-numerical program quantified the effect of tensile pre-damage on the compressive strength of open-hole laminates and estimated an allowable tensile preload using a piecewise-linear interpolation. Specimens were tension-preloaded at 34 and 39 kN to bracket damage initiation and propagation, inspected by thermal de-ply, and then tested in compression. A tensile preload of 39 kN (≈73% of the ultimate tensile load) reduced the residual compressive strength by 19.4% relative to pristine open-hole specimens. A finite-element model predicted failure loads within 5% error and elucidated the coupled roles of fiber bending, matrix damage, and delamination in governing residual capacity. Based on residual capacities at 0, 34, and 39 kN, the allowable preload was estimated as 34.5 kN for retaining ≥95% of the pristine capacity (36.1 kN for ≥90%).