MATERIALS

Pierrepont Analysis are able to non-destructively test a wide range of materials including monolithic laminates, cored/sandiwich laminates, bonded composites and metals.

 

We have expert knowledge of the most effective NDT techniques for each material.

As experienced boat builders we are able draw on our extensive knowledge of composite construction to understand where and why defects within composites are likely to occur.

Monolithic laminates

Monolithic laminates are inspected using a combination of phased array and A-scan ultrasound. We have a wide range of ultrasound transducers and probes to suit different materials, construction methods and surface shape. We have particular expertise and experience in testing very thin and very thick materials (up to 200mm).

The image is of perimeter scans of a MOD70 mast, using a 5MHz array probe attached to an encoder. The probe was slid from the nose to the trailing edge over a length of 900mm. Good cross-sectional information can be quickly recorded and analysed

Cored / sandwich laminates

Pierrepont Analysis uses a wide variety of NDT equipment to inspect cored/sandwich laminates, depending on their core material, construction method and thickness.  We test with a few different NDT methods to cross-reference results, providing a more accurate analysis. 

The scan image is a phased array scan of a calibration panel with a Nomex core, with simulated inner and outer skin disbond. The skin disbond and core shear are visible in the upper C-scan map. Disbonds are also highlighted in the cross-sectional B-scans. The scan was recorded using a low frequency roller array probe. 

Confirmation of a sheared foam core after identification using acoustic bond testing

Calibration test panel with simulated inner and outer skin disbond.

Bonded composites

As with cored laminates, we use a wide variety of NDT techniques to inspect bonded composites, depending on the mix of materials, construction methods and thickness of the laminate. Whether it is metal to composite or composite to composite, particular attention is paid to the interface between the materials. Ultrasound is generally the most effective method of inspection, and we have a wide range of probes and transducers suited to different materials. 

The scan image is of a bonded reinforcement patch, recorded using a 5MHz array probe attached to an encoder. Bubbles are clearly visible in the glue joint in the A, B and C-scans. 

Confirmation of large voids in a glue joint in a keel trunk, identified using ultrasound.

Metals

Pierrepont Analysis have ultrasound equipment for testing metal, which is particularly useful for measuring plate thickness as well as corrosion mapping. We also use dye testing; a quick and effective method to detect surface cracking.