Anisotropic tensile probabilistic failure criterion for composites

Download
Author
McKernan, Scott John
Date
1990-06Advisor
Wu, Edward M.
Second Reader
Wu, Edward M.
Metadata
Show full item recordAbstract
A probabilistic failure criterion is needed to quantitatively predict reliability in critical applications, such as man-safe, deep-sea and air structures, and as an objective function for use in optimum design. Composites are multi-phased and anisotropic, which gives rise to failure in different modes with different probabilistic occurrences that are dependent on the applied stress tensor. Statistical representation of combines stress failure is practically impossible. Probabilistic modeling must be based on the failure modes. This investigation examines the underlying features required in a probabilistic failure criterion for unidirectional fiber-composite structures via Monte Carlo simulations. The interdependencies of the intrinsic strengths (associated with uniaxial loadings) and of the failure modes in a composite structure under combined tensile loadings are elucidated. The joint distribution function for composite failure due to a proportional loading regime is derived starting from the representation of the physical failure process in Boolean operations which, in turn, is represented by probability functions.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
Related items
Showing items related by title, author, creator and subject.
-
Composite failure criterion - probabilistic formulation and geometric interpretation.
Lim, Jong Chun (Monterey, California. Naval Postgraduate School, 1988-12);The objective of this investigation is to derive the reliability and the associated probabilistic failure criterion for composite materials under combined stress. In the analytical derivation, the concept of joint ... -
Composite material repair and reliability
Maman, Shmuel (Monterey, California. Naval Postgraduate School, 1989-03);Composite structure repair methodology has been developed to specific applications (typically in small area and limited to secondary structure) and is being extended to Large Area Composite Structure Repair (with target ... -
Software reliability model with optimal selection of failure data
Schneidewind, Norman F. (IEEE, 1993-11);In the use of software reliability models it is not necessarily the case that all the failure data should be used to estimate model parameters and to predict failures. The reason for this is that old data may not be as ...