DCAMM Seminar - Quantification of Manufacturing Defect Severity in Composites for Failure Assessment

A DCAMM seminar will be presented by

Professor Ramesh Talreja

Department of Aerospace Engineering

Department of Materials Science and Engineering

Texas A&M University, College Station, Texas, USA



Composite materials are manufactured by a variety of processes that produce microstructural compositions depending on the process histories. In spite of efforts to achieve perfect microstructures, real manufactured composites contain defects in the forms of nonuniform fiber distributions, fiber misalignment, matrix voids, etc. Such defects affect the composite’s performance, such as structural integrity and durability, when exposed to service environments. In many cases, the early failure events are significantly affected by the defects, and inadequate account of these effects leads to inaccurate assessment of damage progression and ultimate failure. Furthermore, evaluating the goodness of the manufacturing process requires that the defects are quantified in terms of their severity with respect to the performance metric. A concept for defect severity quantification will be proposed that generalizes the geometric size characterization and allows incorporation of the parameters governing the particular failure mode under consideration. Two failure modes in unidirectional composites will be taken to illustrate implementation of the defect severity measures: a) transverse cracking and b) longitudinal fiber microbuckling.


Danish pastry, coffee and tea will be served 15 minutes before the seminar starts.

All interested persons are invited.


Fri 15 Mar 19
10:00 - 11:00



DTU Wind Energy
Risø Campus
Meeting room 2+3, Building 228
Frederiksborgvej 228
4000  Roskilde