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Quality

TESTING TECHNOLOGY

INVENT offers both destructive and non-destructive testing methods – in accordance with standards as well as individual customer requirements. Whilst the testing of fibre composite materials is the key aspect, other materials can also be competently tested. All tests are carried out by trained personnel using equipment which is regularly calibrated.  
INVENT offers both destructive and non-destructive testing methods – in accordance with standards as well as individual customer requirements. Whilst the testing of fibre composite materials is the key aspect, other materials can also be competently tested. All tests are carried out by trained personnel using equipment which is regularly calibrated.

FARO measuring arm / Ultrasonic test / Mechanical test

Destructive test
For the destructive test, INVENT uses a universal testing machine which enables tests within a load range of up to 20 kilonewton (compression and tension). For the following tests, clamping tools and testing facilities are available:

  • Bending tests
  • Tensile tests
  • Shear tests, for example to determine the interlaminar shear strength in tensile and bending tests (ILSS) as well as testing of bondings
  • Testing of sandwich cores (honeycombs, foams) such as tensile and pressure tests, shear tests and peel tests
  • Customer-specific component testing, for example distortion measurement using displacement transducers (up to three independent measuring points)

Ultrasonic testing
The non-destructive test method of ultrasonic testing is utilised by INVENT for the detection of pores, imperfections and delamination in monolithic fibre composite structures. Furthermore, the laminate thickness can thereby be measured; this also applies in the case of complex component geometry. Comprehensively-trained and experienced employees with qualification level UT2 carry out these highly precise tests in accordance with customers’ orders.

Example Step wedge

Ultrasonic inspection of a CFRP part
Flat-bottom holes in different sizes on the rear face of a step wedge

A special form of test specimens is a so-called step wedge. In fibre composite lightweight design, these are required as reference samples for quality control using ultrasonic testing. Step wedges can be approved for use in aeronautics via the Airbus standard AITM 6-0012.

With a step size of 130mm x 130mm, the reference samples are also suitable for adjusting phased array equipment. Each step has a flat-bottom hole as comparison reflectors in different diameters and depths. Intentional defects can also be integrated for test purposes. Step wedges can be made from unidirectional semi-finished fibre products, fabric and NCF on request of the customer. Even other materials besides carbon fibre and glass fibre semi-finished products can be used. Besides standardised step wedges, INVENT GmbH also produces component-specific reference samples. Special specimens for training in ultrasonic and tapping tests are currently in development.

Precise measurement
INVENT uses a Faro Quantum measuring arm with seven axes. Thanks to the most modern technology, this instrument can measure almost any component geometry as well as being able to precisely align elements during their integration. Its working radius of 2.4 metres enables INVENT to carry out measurements of up to 28 micrometer (µm) volumetric accuracy. The measurement results can be presented in the form of a measurement log with user-definable dimensions or in relation to a CAD dataset. The measuring arm is transportable, enabling the measurement of components in an installation situation at a customer’s premises.

News

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