Strain measurement

摘要

ASDEC is now able to undertake detailed non-contact surface strain measurements to add to its capabilities in the measurement and analysis of vibration. The University of Leicester facility is using its Polytec 3D scanning laser vibrometer to undertake a detailed surface scan to measure component strains and to produce, by calculation, a full-field map of stresses and strains that is directly comparable to the engineers finite element (FE) results. Obtaining a detailed map of component stresses and strains under dynamic loading is highly time-consuming using traditional methods. Added to this, the placement of strain gauges on modern and extremely lightweight materials can have a measureable effect on damping and stiffness, causing uncertainty in the results. The ASDEC use of a 3D scanning laser is a non-contact method that does not add mass to the structure and therefore has no observer effect on the results. These high-quality results are extremely quick to obtain, as there is no need to invest time in the delicate art of affixing foil strain gauges to the component.