Relative displacement measurements for two-body problemsWhile high-sensitivity moire interferometry is very effective for displacement measurements in continuous bodies, special difficulties arise with two-body problems. Fringes may become discontinuous at the boundary between the bodies and as a result the relative displacements cannot be extracted from the fringe patterns. In this work, flexible bridges are used between the bodies to provide a continuous path for fringe counting. The bridges are made of relatively low modulus material and have a low stiffness geometry, such that they deform under minimal load. The experimental methods used for obtaining relative displacement measurements in two-body problems are described for the two cases; dovetail joint in turbo-machinery, and thick adherend lap joint.
Document ID
19860049883
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Post, D. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Czarnek, R. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Wood, J. (Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Joh, D. (Virginia Polytechnic Institute and State University Blacksburg, United States)