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 20 of 52 for “"progressive failure"”.
-
Progressive failure analysis of laminated composite structures
A methodology for progressive failure analysis is presented that is applicable to thin composite structures undergoing large deformations. The method is based on a nonlinear shell theory that accounts for geometric and material nonlinearities. An isoparametric, displacement-based finite element …
-
Progressive Failure Analysis of Laminated Composite Structures
… composite structures requires a complete failure analysis, which includes both initiation and propagation of damage. In this work a progressive failure methodology is developed and implemented in the commercial Finite Element software package, Abaqus. Out of the numerous failure criteria …
-
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, …
-
Progressive failure of slopes in lined waste impoundments
The failure of the Kettleman Hills landfill focused attention on the uncertainties associated with the use of limit equilibrium analyses for evaluation of the stability of slopes in which failure occurs along displacement-softening interfaces. Sliding on such interfaces can occur in a progressive …
-
Energy Absorption and Progressive Failure Response of Composite Fuselage Frames
… under a radially inward load to assess their progressive failure response and energy absorption characteristics. The test articles in the first series of tests are six-foot diameter, semicircular, I-section frames fabricated from graphite-epoxy unidirectional tape. The test articles in the …
-
Development of a Progressive Failure Model for Notched Woven Composite Laminates
… and require more complex methods for predicting failure. NASA is seeking a method for predicting the damage initiation and propagation of woven fabric composites in order to utilize these materials effectively in SLS hardware. This work focuses on notched woven fabric composites under tensile …
-
Comprehensive Multi-Scale Progressive Failure Analysis for Damage Arresting Advanced Aerospace Hybrid Structures
… level. Therefore, a computational methodology is progressively developed based on physically realistic concepts without the use of tuning parameters. A thorough verification study is performed to identify the most effective approach to model PRSEUS, including the effect of element type, boundary …
-
Development of a Progressive Failure Finite Element Analysis For a Braided Composite Fuselage Frame
… in axial compression to study the modes of failure with and without local buckling occuring.The textile preform architecture is a 2x2, 2-D triaxial braid with a yarn layup of [0 deg 18k/+-64 deg 6k] 39.7% axial. The preform was resin transfer molded with 3M PR500 epoxy resin. Finite element …
-
Optimal design of composite fuselage frames for crashworthiness
… for increasing structural crashworthiness is a progressive failure analysis. Currently, the most widely used analysis methods for progressive failure of composite structures are considered too expensive computationally for practical optimization in today's computing environment. Developing an …
-
Numerical simulation of damage and progressive failures in composite laminates using the layerwise plate theory
The failure behavior of composite laminates is modeled numerically using the Generalized Layerwise Plate Theory (GLPT) of Reddy and a progressive failure algorithm. The Layerwise Theory of Reddy assumes a piecewise continuous displacement field through the thickness of the laminate and therefore …
-
Finite element-based failure analysis of composite laminates with non-destructive feature quantification.
… very difficult to characterize and predict the failure process while they are in operation. This research experimentally investigates the failure mechanism of CFRP manufactured under three different loading modes: failure onset for a planar loading condition, delamination for a mixed mode static …
-
Self-reinforced polymer composites for energy absorbing applications
… without curtailing the ductility and exhibiting progressive failure and resulted in novel hybrid composites with higher modulus and ductility than SRPP. Glass fibre volume fraction, thickness and the layup were the crucial design parameters to reach progressive failure. Pseudo-ductility was …
-
Failure Initiation and Progression in Internally Pressurized Non-Circular Composite Cylinders
In this study, a progressive failure analysis is used to investigate leakage in internally pressurized non-circular composite cylinders. This type of approach accounts for the localized loss of stiffness when material failure occurs at some location in a structure by degrading the local material …
-
Modeling of textile based composite materials
… based model for interrogation of the elastic and progressive failure response of textile based composite materials has been developed and implemented. The geometrically thorough textile geometry model is used as the basis for creation of the geometry used for the finite element analysis. A …
-
Static and Seismic Stability of Cut Slopes in Terms of Reliability
… such as highly overconsolidated clay considering progressive failure as the critical failure mode. The stress condition along a potential failure surface both prior to and after an excavation is investigated by finite-element elasto-plastic analysis; in this process, a potential failure surface is …
-
Nonlinear analysis of laminated composite shells using a micromechanics-based progressive damage model
A micromechanics-based model for progressive failure analysis of laminated composite shell structures has been developed and implemented. The model couples a finite element model for nonlinear analysis of laminated shells with a micro mechanics elasticity solution for predicting failure and …
-
Optimum crashworthiness design of grid-stiffened composite fuselage structures
… The method was implemented in concert with a progressive failure model to model the entire crash sequence, including failure events and subsequent response. Several examples were used to validate this method. This method was then implemented, along with simple models for assessing the ability …
-
Finite Element Analysis of Defects in Cord-Rubber Composites and Hyperelastic Materials
… finite element approach based on the multiscale progressive failure analysis is employed to provide the theoretical predictions for damage development in the cord-rubber composites in tires. This new three-dimensional model of the cord-rubber composite is proposed to predict the different types …
Page 1 of 3