Strain Gage Measurements

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1 Strain Gage Measurements

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3 Strain Gage Measurements Strain gauge measurements The electrical resistance strain gauge technique is based on measuring the variation in electrical resistance undergone by a strain gauge grid, which is bonded to the component under analysis and subjected to strain. It is an extremely versatile test method as it enables the elastic and plastic strain of any material to be obtained in actual operating conditions, even in hostile environments, with an appropriate choice of components for the strain gauge installation. SINT Technology has a long track record in strain gauge measurement and over the years has developed measurement techniques in collaboration with research centres and universities. SINT Technology performs a wide range of activities in the strain gauge measurement sector, such as: Installation, measurement and data analysis services both in situ and in laboratory Training and certification of specialists with CIC PND approved examinations Production of measuring equipment and transducers. Our services are characterised by: the professionalism guaranteed by highly skilled engineering technicians dynamism and flexibility willingness to perform testing on the customer's plant in all parts of the world detailed reporting in accordance with the customer's requirements and the main international technical Installation, measurement and analysis services SINT Technology offers services for many different applications on field and in laboratory, for instance: Measurement of static and dynamic strains Experimental stress analysis Measurement of torque and torsional vibration on rotating shafts Strain gauge measurements on pressure vessels Residual stress analysis Experimental modal analysis Installation of strain gauges Design and construction of transducers (eg, load cells)

4 Strain Gage Measurements Measurement of static and dynamic strains SINT Technology is able to perform static and dynamic measurements, using strain gauges and other types of sensors. The exerience of the staff and vast array of instrumentation at their disposal makes it possible to carry out a wide range of applications. Experimental stress analysis Experimental stress analysis is used to determine the stress states of structures or components subjected to actual load conditions or for verifying and calibrating finite element calculation models. Construction of transducers SINT Technology can produce force and torque transducers, especially designed for specific applications, that are able to operate in the most diverse conditions.

5 Strain Gage Measurements Measurement of torque and torsional vibration on rotating shafts Analysing vibration and torsional resonance is an extremely effective diagnostic tool for identifying abnormal conditions during operation of rotating machinery which can result in damage. Measurement of torque is used to calculate transmitted mechanical power. SINT Technology has telemetry systems and software for performing torsional vibration analyses on a wide variety of machinery. Installation of strain gauges SINT Technology employs highly skilled resources who have expertise in strain gauge applications on field and in the laboratory. Strain gauge measurements on pressure vessels SINT Technology performs experimental tests on pressure vessels, for example, for determining stresses occurring during hydrostatic testing of components. Residual stress analysis SINT Technology is a laboratory specialised in measuring residual stress by strain gauge methods. Some of the main methods are: the Sachs method, also known as the boring-out method Layer removal Sectioning Hole-drilling the ring-core method. In addition, SINT Technology produces and develops the only piece of equipment in the world for automatic measurement of residual stress by the blind hole method, called RESTAN (REsidual STress ANalyser).

6 Strain Gage Measurements Experimental modal analysis Modal analysis is used to understand and model the dynamic behaviour of a structure. It can be carried out both to determine the natural frequencies and mode shapes of a structure and to verify accuracy and calibrate a finite element model (FEM). The strain gauge method can be used in applications where other types of sensors (for instance, accelerometers) could alter the dynamic characteristics of the structure. Instrumentation SINT Technology can count on an extensive range of instruments for measuring and analysing strain, with a wide availability of acquisition channels and instrumentation able to cover many types of tests. Some of the instruments are: Multi-channel signal conditioners (ac and dc) Multi-channel data acquisition systems Digital strain indicators Telemetry systems Training Courses SINT Technology is an examination centre recognized by CICPND (the Italian Coordination Center for Nondestructive Testing) for providing first and second-level certification courses and examinations for electrical resistance strain gage testing engineers. SINT Technology is also a member of AIAS (the Italian Association for Stress Analysis) and periodically organizes courses, study days and work groups on analysis of the behaviour of materials, components, structures and systems. Standards Field of Application Description Standard code Stress Analysis Non-destructive tests. Inspection with electrical re- UNI 10478: sistance strain gauges Residual Stresses Standard Test Method for Determining Residual ASTM E Stresses by the Hole-Drilling Strain-Gage method

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8 Contact Us Via delle Calandre, Calenzano (FI) ITALY Tel: Fax: VAT IT Recognitions SINT Technology s test laboratory is accredited to standard ISO/IEC 17025:2005 by the Italian accreditation body ACCREDIA with certificate no Certification of conformity to the requirements of standard UNI EN ISO 9001