Optical assessment of stress and deformation in tubular parts of autoseats

Manuel Filipe Costa; Francisco José Queirós de Melo; Joaquim A. O. Carneiro

doi:10.1117/1.3476333

1 August 2010 Optical assessment of stress and deformation in tubular parts of autoseats

Manuel Filipe Costa, Francisco José Queirós de Melo, Joaquim A. O. Carneiro

Author Affiliations +

Optical Engineering, Vol. 49, Issue 8, 083602 (August 2010). https://doi.org/10.1117/1.3476333

Abstract

In this study, an optical noncontact roughness measurement for the assessment of stress and deformation in lightweight metallic tubular structural parts of autoseats is presented. The deformation of circular section tubes subjected to centered transversal force can be assessed by measuring strain or bending of the tubes. Most frequently contact gauges are used in this process. We employ optical noncontact microtopographic inspection using the MICROTOP.06.MFC microtopographer developed at the Microtopography Laboratory of the Department of Physics at the University of Minho. Bending radius can be directly measured. However, for stronger deformations, bending radius measures become unreliable and full topographic inspection must be performed. If the surface of the tubes in the area where maximum deformation is expected to occur (located by finite element simulation models) is textured to a certain level of roughness, changes in the roughness values after deformation are expected to be measurable. A direct correlation between the deformation state/tension, strain and stress, and surface roughness, in particular average roughness, is found.

©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Manuel Filipe Costa, Francisco José Queirós de Melo, and Joaquim A. O. Carneiro "Optical assessment of stress and deformation in tubular parts of autoseats," Optical Engineering 49(8), 083602 (1 August 2010). https://doi.org/10.1117/1.3476333

Published: 1 August 2010

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KEYWORDS

Inspection

Sensors

Light sources

Optical engineering

Optical inspection

Physics

Scattering

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