Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"quasi-isotropic laminate"”.
-
Flexural Stiffnesses of and Dimensional Stability in Circular Quasi-isotropic Laminate Mirrors
… understanding of the mechanics associated with quasi-isotropic laminates for diffraction-limited displacement constraints, and lack of understanding for effects of resin buffer layers on composite mirrors for high surface smoothness. In this dissertation document, radial stiffness associated …
-
Progressive Failure Analysis of Double-Notched Composite Laminates
Failure analysis in composite laminates is traditionally modeled by the material property degradation method for the in-plane damage prediction which assumes that a damage material can be replaced by an equivalent material with degraded properties. The delamination in composites, on the other hand, …
-
Effects of load proportioning on the capacity of multiple-hole composite joints
… two hole diameters are considered. Three laminates are considered: a quasi-isotropic laminate; a cross-ply laminate; and a 45 degree angle-ply laminate. By proportioning the load, capacity can be increased generally from 5 to 10%. In some cases a greater increase is possible.
-
Effects of Curing Cycle and Loading Rates on the Bearing Stress of Double Shear Composite Joints
… fixture at a loading rate of 0.05 in./min. (quasi-static). The second task is to numerically model and validate the aluminum double shear joint specimen. The third task is to test the Unidirectional MTM 49 carbon fiber pre-preg double shear composite joint specimens with two different cure …
-
Characteristics of thermally-induced transverse cracks in graphite-epoxy composite laminates
… cracks in T300/5208 graphite-epoxy cross-ply and quasi-isotropic laminates were investigated both experimentally and analytically. The formation of transverse cracks and the subsequent crack spacing present during cooldown to -250°F (116K) and thermal cycling between 250 and -250°F (116 and 394K) …
-
Geometrically Nonlinear Analysis of Axially Symmetric, Composite Pressure Domes Using the Method of Multiple Shooting
… The shell is allowed to have general composite laminate construction, elastic supports at the edges and internal ring stiffeners. In addition, the analysis allows for the possibility of circumferential line loads at discrete locations along the dome meridian. The problem is a numerically …
-
Local and Global Sensitivity Analysis of Thin Ply Laminated Carbon Composites
Recent work in the area of composite laminates has focused on the characterization of the strength of laminates constructed from very thin plies. Interlaminar shear and normal stress components have been shown to be concentrated on the edges, the so-called edge effect, of unidirectional laminates …
-
Lamb wave propagation in laminated composite plates
Low frequency Lamb waves in composite laminates were investigated theoretically and experimentally. To have a general solution for Lamb wave propagation in multilayered composite laminates is not practical due to a large number of boundary conditions needed to be satisfied at the interlaminar …
-
Use of Material Tailoring to Improve Axial Load Capacity of Elliptical Composite Cylinders
… whereby each region is constructed of either a quasi-isotropic or an axially-stiff laminate of equal thickness, are studied. Results are compared to the baseline case of an elliptical cylinder constructed entirely of a quasi-isotropic laminate. Since the thickness of the quasi-isotropic and …
-
Thermal and Mechanical Response of Curved Composite Panels
Curved panels constructed of laminated graphite-epoxy composite material are of potential interest in airframe fuselage applications. An understanding of structural response at elevated temperatures is required for anticipated future high speed aircraft applications. This study concentrates on the …
-
Nanomaterial-Enabled Out-of-Autoclave and Out-of-Oven Manufacturing of Fiber Reinforced Polymer Composites
… form lamina that are stacked to form a composite laminate. These aerospace-grade composite structures generally require an autoclave cure, which uses both temperature and pressure to cure the thermoset polymer (or consolidate the thermoplastic polymer) in the prepreg and remove voids throughout …