Stress determination by using out-of-plane deflection with scanning laser doppler vibrometer

Scanning Laser Doppler Vibrometer is one of the technologies in non-contact measurement that is capable of measuring deflection of structure. This project isto determine stress on plate structure due to vibration with free boundary conditions by using non-contact out-of-plane single head scanning laser doppler vibrometer measurement. The first vibration mode frequency is used to vibrate the plate meanwhile the single head scanning laser vibrometer is used to measure out-of-plane deflection of the plate surface. The measured deflection values are then used to calculate stresses at the plate surface by using the relation of stress with bending formation. Furthermore, direct strain values of the plate have been measured at certain bending formation that corresponded to the bending formation due to the first vibration mode excitation. This experiment method shows that the stress determination by using out-of-plane deflection is possible by using single head scanning laser doppler vibrometer