The real challenge in composites inspection isn't inspection
Composite structures are becoming commonplace across aerospace, energy, defence and advanced manufacturing. As their use grows, so too does the need for confident, reliable inspection.
Most discussions about non-destructive testing focus on equipment. Higher resolution imaging. New techniques. Faster inspections.
But for composites, the bigger challenge often comes much earlier.
It is understanding what is being inspected.
Composite defects are different
Composite structures do not behave like metals, and they do not fail like metals.
Many of the defects inspectors encounter are not the result of damage in service. They originate during manufacture. Voids, porosity, dry fibres, delaminations and inclusions all tell a story about how a component was produced, not just how it has been used.
Finding those indications is only part of the job. The more difficult question is understanding what they mean.
Is the indication a manufacturing artefact or a structural concern? Is it within tolerance, or does it require intervention? Does it affect performance, or is it simply part of the process variation expected for that manufacturing route?
Those decisions cannot be made by inspection equipment alone.
Manufacturing knowledge changes inspection quality
Every composite manufacturing process produces different characteristics.
Wet lay-up, resin infusion, prepreg and resin transfer moulding each create their own defect profiles, process signatures and inspection challenges. An inspector who understands how a part was manufactured is better placed to understand where defects are likely to occur, what acceptable variation looks like, and which inspection methods will provide the most meaningful results.
The quality of an inspection is often determined long before the equipment is switched on. It starts with understanding how the component came into existence.
The cost of uncertainty
Poor inspection decisions rarely stop at the inspection stage.
A false positive can lead to unnecessary repairs, scrap or production delays. A false negative carries obvious quality and safety implications. Even uncertainty has a cost, creating additional inspections, engineering reviews and delays while organisations try to determine the right course of action.
As composites become more widely adopted, those decisions become increasingly significant.
Inspection capability is no longer simply about identifying defects. It is about making confident decisions based on a sound understanding of materials, manufacturing processes and structural behaviour.
What NCC sees in practice
At NCC, inspection challenges are rarely caused by a lack of inspection technology. More often, they stem from a disconnect between manufacturing and inspection.
Inspectors can’t accurately assess components without fully understanding how they were produced. Equally, manufacturers do not always understand how their process decisions influence what an inspector will later see.
That disconnect has real consequences. It can lead to unnecessary repairs, overly cautious decisions, or uncertainty about whether an indication represents a manufacturing artefact or a genuine structural concern.
Closing that gap is why NCC developed its Composites for Non-Destructive Testing Practitioners course.
Rather than beginning with inspection equipment, participants manufacture composite parts themselves, see how common defects form, and then inspect those components using a range of non-destructive testing methods. The course is built around a simple principle: better inspection decisions start with a better understanding of how composite parts are manufactured. By manufacturing components, creating defects and then inspecting them, participants develop the judgement needed to interpret inspection results with confidence.
Looking ahead
Composite structures will continue to become more common across industry.
Inspection capability will need to grow alongside them.
The organisations that inspect composite structures most effectively will not necessarily be those with the latest equipment.
They will be those with the deepest understanding of the materials, manufacturing processes and defect mechanisms behind every inspection result.
Because in composites, the most valuable inspection tool is not always the one in your hand. It is the knowledge you bring to the decision.
Developing that understanding requires more than familiarity with inspection techniques alone. It requires experience of how composite parts are manufactured, how defects form and how inspection findings should be interpreted in context.
Find out more about the Composites for Non-Destructive Testing Practitioners course.