A transparent material subjected to stresses becomes birefrigent, producing a relative retardation between orthogonally polarized rays that is proportional to the strains. in photoelasticity, this retardation is measured visually, using a variety of compensators, or automatically,using complex… More

The objective of the proposed research is to develop a new approach to the problem of locating the tip of a crack and measuring its growth. the proposed system should be capable of performing this task automatically, at room or at elevated temperature, while the specimen is subjected to fatigue… More

Strainoptic technologies, inc., proposes to analyse, design,fabricate, and test a fiber optic photoelastic pressure sensor for high temperature gases. this work will address the so-far virtually intractable problem of obtaining gas pressure data at temperatures up to 1650 degrees celsius. this study… More

Conventional ultrasonic nondestructive evaluation is capable of detecting porosity in resin-matrix composites, but cannot evaluate the porosity distribution, nor even evaluate reliably the proper porosity percentage. this study is proposed to develop an ultrasonic tomography technique for mapping… More

The objective of the proposed research is to develop a method for measuring residual stress gradients in the wall of artillery shells, based on a novel acousto-elastic approach, using a broadband ultrasonic signal and surface-hugging guided wave modes. the research will include the development of… More

A high power low frequency, frequency bandwidth control ultrasonic sector B-scan system with specially designed sector scan transducers is proposed for the internal or under water one-sided inspection of thick (at least 3") composite components with complex surface shapes. This technique is based on… More

The objective of the proposed research is to develop an integrated system for dynamic stress analysis of aircraft tires. The system will use the Projection-Moire concept, whereby a high-density line-set of Master Grating is projected on the investigated surface. The projected lines, deformed by the… More

The objective of the proposed research is to develop a multi-axial balance, based on measurement of bulk-birefringence that develops in selected structural members as result of forces and moments applied. The proposed concept will make possible a balance design that is inherently more rigid, since… More