Characterization of out-of-plane impact damage in stitched CFRP laminates

Akinori Yoshimura, Tomoaki Nakao, Shigeki Yashiro, Nobuo Takeda

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The present study experimentally and numerically investigated the damage progress in stitched and unstitched CFRP laminates under the low-velocity out-of-plane impact load. First, we performed drop-weight impact tests for both stitched and unstitched specimens, and inspected the damage by using the soft X-ray radiographs and micro-focus X-ray CT We then conducted damage-extension simulation using a layer-wise finite element model with stitch threads as beam elements, in which the damage (ply cracks and delamination) was represented by cohesive elements. A detailed comparison between the experimental and simulated results confirmed that stitching effectively suppressed the out-of-plane impact damage. Furthermore, we demonstrated that the improvement effect of impact damage resistance became greater when the impact energy was larger.

Original languageEnglish
Title of host publicationProceedings of the 16th International Conference on Composite Materials, ICCM-16 - "A Giant Step Towards Environmental Awareness
Subtitle of host publicationFrom Green Composites to Aerospace"
PublisherInternational Committee on Composite Materials
ISBN (Print)9784931136052
Publication statusPublished - 2007
Externally publishedYes

Publication series

NameICCM International Conferences on Composite Materials

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • General Engineering


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