Probabilistic Barely Visible Impact Damage (BVID) Risk Assessment Tool
Abstract
Impact damage of laminated composite structures continues to be a challenging problem. The complexity of damage morphology, the sequence of damage events, and multiple damage modes pose significant challenges when it comes to design for damage tolerance. In an effort to reduce some of the complexity, a systematic experimental study was conducted to understand the sequence of damage during impact of a thin and thick composite plates. Varying configurations of carbon fiber reinforced epoxy composite panels were impacted with increasing impact energies. Digital image correlation (DIC) using high speed camera was performed to measure plate deflection and strain evolution during the impact event. Detailed post impact measurement and imaging were conducted to quantify the extent of damage and delamination. Compression after impact (CAI) tests were conducted to ascertain the post impact compressive load carrying capability of the panel. The results of the experiments indicate a sequence of damage from back surface splitting, delamination and then impact surface compressive failure. Correlations were also found between impact energies, panel configuration and damage type and morphology. The extent of impact damage as well as the compressive strength knockdown is very different between thin composites and thick composites. The data thus generated is useful for validating computational models for impact damage and CAI. An approach to performing such validation is also provided in this study.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2022
- Accession Number
- AD1196267
Entities
People
- Andrew Seamone
- Anthony Waas
- Paul Davidson
Organizations
- University of Michigan