Download Free Analysis Of Strain Near Discontinuities In Composite Laminates By Moire Interferometry Book in PDF and EPUB Free Download. You can read online Analysis Of Strain Near Discontinuities In Composite Laminates By Moire Interferometry and write the review.

A description of both the theory and practice of physical measurements that use high-sensitivity moiré - principally moiré interferometry. The focus here is on the mechanics and micromechanics of materials and structural elements and the book includes new studies published for the first time. Diverse fields are addressed: advanced composite materials, thermal stresses, electronic packaging, fracture, metallurgy, time-dependence, strain gage calibration. All the methods can be applied for whole-field measurements on nearly and solid bodies. This reader-friendly book will serve engineers and scientists who are concerned with measurements of real phenomena, while also stimulating students to pursue the treasures of experimental analysis.
The deformation along cylindrical surfaces of holes in tensile-loaded specimens was measured using new moiré interferometry techniques. The techniques were developed and validated using an isotropic, homogeneous aluminum specimen. Two composite tensile specimens, fabricated from IM7/5250-4 pre-preg with ply lay-ups of [0°4?90°4]3s and [+30°2??30°2?90°4]3s, were then examined using the new techniques. Circumferential and thickness direction displacement fringe patterns (each 3° wide) were assembled into 90°-wide mosaics around the hole periphery for both composite specimens. Distributions of strain were calculated with high confidence on a sub-ply basis at selected angular locations. The measured strain behavior was complex. Ply-by-ply trends were revealed. Large ply-related variations in the circumferential strain were observed at certain angular locations around the periphery of the holes in both composites. Extremely large ply-by-ply variations of the shear strain were also documented in both composites. Peak values of shear strain approached 30 times the applied far-field axial strain. Residual viscoelastic shearing strains were recorded in regions of large load-induced shearing strains. Large ply-group related variations in the thickness direction strain were observed in the [+30°, were then examined using the new techniques. Circumferential and thickness direction displacement fringe patterns (each 3° wide) were assembled into 90°-wide mosaics around the hole periphery for both composite specimens. Distributions of strain were calculated with high confidence on a sub-ply basis at selected angular locations. The measured strain behavior was complex. Ply-by-ply trends were revealed. Large ply-related variations in the circumferential strain were observed at certain angular locations around the periphery of the holes in both composites. Extremely large ply-by-ply variations of the shear strain were also documented in both composites. Peak values of shear strain approached 30 times the applied far-field axial strain. Residual viscoelastic shearing strains were recorded in regions of large load-induced shearing strains. Large ply-group related variations in the thickness direction strain were observed in the [+30°2??30°2?90°4]3s specimen. An important large-scale trend was observed in which the thickness direction strain tended to be more tensile near the outside faces of the laminate than near the mid-ply region.
The deformation on cylindrical surfaces of holes in tensile loaded laminated composite specimens was measured using new moiré 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 surfaces of holes. Replicas of the cylindrical specimen gratings (undeformed and deformed) were fabricated onto circular steel sectors. Narrow angular regions of these sector gratings were directly evaluated in a moiré interferometer. This moiré interferometry approach eliminated potential sources of error associated with other moiré interferometry approaches. Two composite tensile specimens, fabricated from IM7/5250-4 pre-preg with ply lay-ups were examined using the newly developed moiré interferometry techniques. The measured strains were compared with the three-dimensional analysis technique known as Spline Variational Elastic Laminate Technology (SVELT), resulting in a very close match and corroborating the usefulness of SVELT.
This book contains the proceedings of the Third Australasian Congress on Applied Mechanics (ACAM2002). The Congress was held to provide an international forum for researchers, industry practitioners, engineers and postgraduate scholars to exchange and disseminate knowledge and experience of the most recent advances with a focus on the behaviour of solids. Topics include: biomechanics; constitutive modelling; damage; fracture; fatigue; dynamics; impact; vibration; geo-mechanics; tribology; machining and more.