Improvement on out-of-plane impact resistance of CFRP laminates due to through-the-thickness stitching

Akinori Yoshimura, Tomoaki Nakao, Shigeki Yashiro, Nobuo Takeda

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)


The present study both experimentally and numerically investigated the damage process in the stitched laminates under the low velocity impact loading, and revealed the characteristic of the improvement on out-of-plane impact resistance due to stitching. First, we performed drop-weight impact tests and inspected the damage by using non-destructive inspection techniques. 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 revealed that impact damage resistance was improved more effectively when the impact energy was larger. The simulated results demonstrated that the increase of the number of stitch threads which located inside and near the delamination area caused this phenomenon.

Original languageEnglish
Pages (from-to)1370-1379
Number of pages10
JournalComposites Part A: Applied Science and Manufacturing
Issue number9
Publication statusPublished - Sept 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials


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