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Showing 1 to 20 of 22 for “"moire interferometry"”.
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The application of Moire interferometry to automated 3-dimensional inspection
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
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Extension of Moire interferometry into the ultra-high sensitivity domain
… per fringe contour, which corresponds to that of moire with 20,000 lines per mm, in combination with spatial resolution of the optical microscope (2-5 μm). The objective was achieved by the following developments. First, the basic sensitivity of moire interferometry was increased beyond the …
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Developments in moire interferometry: carrier pattern technique and vibration insensitive interferometers
… to answer the questions. It has been proved that moire interferometry is a powerful technique in the study of composite materials. The high sensitivity and resolution of a measurement technique is the key to determining the properties of a material which has a fine and complicated structure such …
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Development of a Virtually Calibrated Projection Moire Interferometry Technique Capable of Inaccessible Surface Measurements
… on the submicron scale. Projection Moiré Interferometry (PMI) is an out-of-plane displacement measurement technique, and consists of capturing reference and deformed images of a grid pattern projected on the test object. By differencing the reference and deformed images of the projected …
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Interlaminar Deformation at a Hole in Laminated Composites: A Detailed Experimental Investigation Using Moire Interferometry
… composite specimens was measured using new moire interferometry techniques. These new techniques were developed and evaluated using a 7075-T6 aluminum control specimen. Grating replication techniques were developed for replicating high quality diffraction gratings onto the cylindrical …
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An experimental study of frictional phenomena around the pin joints of plates using moire interferometry
… at VPI & SU, is employed: high-sensitivity moiré interferometry. Using a clearance pin-joint model made of prototype structural material, Aluminum 7071-T6, studies on frictional phenomena between the pin and plate are conducted to provide a comprehensive treatment of the following subjects: …
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Induced strain of actuation of surface bonded and embedded piezoceramic patches
… voltage/strain response was characterized using moire interferometry and Twyman-Green interferometry techniques. Moire interferometry experiments were conducted to investigate the induced strain of actuation in a flat plate with two surface bonded piezoceramic patches and a flat plate with one …
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Determination of stress concentration factors using experimental methods
… brittle specimen failure, photoelasticity, and Moire interferometry. Results are compared to each other and to finite element analysis performed on the same geometry. Strain gaging and photoelasticity were chosen as the best methods for stress concentration factor determination.
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Integration and processing of high-resolution moiré-interferometry data
A new hybrid method combining moire interferometry, high resolution data-reduction technique, two-dimensional datasmoothing method, and Finite Element Method (FEM) has been successfully developed. This hybrid method has been applied to residual strain analyses of composite panels, strain …
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Effects of layer waviness on compression-loaded thermoplastic composite laminates
… fatigue life were determined experimentally. Moire interferometry was used to investigate the disturbance in the displacement fields and the modes of deformation associated with layer waviness under compression loading. The state of stress in the vicinity of the layer waves and the influence …
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Interlaminar deformations on the cylindrical surface of a hole in laminated composites: an experimental study
… of the panels. The experimental technique of moire interferometry was extended to take measurements of in-plane deformations on singly-curved surfaces. A replication scheme was developed to produce high-frequency diffraction gratings on singly-curved surfaces. Two different techniques were …
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An evaluation of the Iosipescu specimen for composite materials shear property measurement
… conventional strain gage instrumentation and moire interferometry is performed. A finite element analysis of the Iosipescu shear test for unidirectional and cross-ply composites is used to assess the uniformity of the shear stress field in the vicinity of the notch, and demonstrate the effect …
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Local Displacements and Load Transfer of Shape Memory Alloys in Polymeric Matrices
… in epoxy were measured using heterodyne microinterferometry. The interfacial bond strengths from the pullout tests were correlated with the maximum wire displacements. The transient load transfer behavior of a one-way SMA ribbon in a room temperature cured polymer matrix was quantified using …
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New in-plane and interlaminar shear test methods for fiber reinforced composites
… on a cross-ply laminate. High sensitivity moire interferometry was used to determine the shear and normal strains on the entire face of the specimen. The results of the test were compared to those of the Iosipescu specimen on the same material. The compact specimen produced a more uniform …
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Viscoelastic Properties of Polymer Composites During Processing
… matrix at any time during cure. Additionally, moire interferometry was successfully applied to the measurement of the viscoelastic Poisson's ratio of the matrix through its entire glassy-to-rubbery transition. The matrix viscoelastic material models were then used to predict composite …
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Compressive strength and behavior of 8H C3000/PMR15 woven composite material
… surrounded by other plies to the results of the Moire interferometry on the edge of a laminate. A model was introduced which incorporated the micromechanical geometry as well as the constituent properties to predict the notched and unnotched compressive strengths of the woven material. For …
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A mixed computational algorithm based on the updated Lagrangian description for plane elastic contact problems
… method with the experimental technique of moire interferometry. The displacements at the pin-hole interface are measured from physical experiments and are then used as prescribed boundary conditions in the finite element analysis of the modeled problem, which in turn is used to compute the …
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High resolution interferometric measurements of residual strains in composites
… a new method of measuring then1 is required. Moire interferometry combined with the cut-and-sectioning method has been developed for effective measurement of residual strains in fiber-reinforced composites. This optical technique provided the capability of studying separately the effect of …
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Application of localized hybrid methods of stress analysis to some problems in the mechanics of composites
… which combines an experimental technique — moire interferometry, and a numerical method — finite element analysis, is presented. In this localized hybrid method, the displacement fields which the moire experiments provide in some local regions of interest are used as input data for finite …
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Experimental and numerical analysis of abrasive waterjet drilling of brittle materials
… ceramic composites (CFCC). Second, a moire interferometry experimental setup and procedure were developed, as well as a 3-D finite element model. The measured surface displacement distributions were used to drive the finite element modeling. In this inverse problem, the measured …
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