9 Matching Results

Search Results

Advanced search parameters have been applied.
in creator/contributor: "Weitsman, Y. J."  
Results: 1 - 9
open access

Multifracture of ceramic composites

Description: This work presents a mechanistic model for the multifracture process of uniaxially reinforced fibrous ceramic composites under monotonically increasing tension parallel to the fiber direction. The model employs an energy criterion to account for the progression of matrix cracks, bridged by intact fibers, and Weibull failure statistics to relate the failure of the fibers. Consideration is given to the interactions between the foregoing failure processes as well as to the effects of various mater… more
Date: March 1, 1992
Creator: Weitsman, Y. J. & Zhu, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanical Response of Stitched T300 Mat/Urethane 420 IMR Composite Laminates: Property/Orientation Dependence and Damage Evolution

Description: This report presents experimental and analytical results of investigations on the mechanical response of stitched T300 mat/urethane 420 IMR composite laminates with three different lay-up configurations. Tensile tests and short-term creep and recovery tests were conducted on the laminate coupons at various orientations. The X-ray photographic technique was adopted to detect the internal damage due to external loading history. The tensile data of laminates with antisymmetric and symmetric lay-up… more
Date: March 1, 2000
Creator: Deng, S. & Weitsman, Y.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

On the Mechanical Response of Chopped Glass/Urethane Resin Composite: Data and Model

Description: This report presents data on the creep response of a polymeric composite that is a candidate material for automotive applications. The above data were used to establish the basis for the mechanical characterization of the material's response over a wide range of stresses and temperatures, as well as under cyclic loading and due to exposure to distilled water. A constitutive model based upon fundamental principles of irreversible thermodynamics and continuum mechanics was employed to encompass t… more
Date: November 1999
Creator: Elahi, M. & Weitsman, Y. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Some Aspects of the Deformation Response of Swirl-Mat Composites

Description: This report concerns the mechanical response of random glass fiber strand swirl-mat/urethane matrix composite under static and cyclic loads as well as under elevated temperatures and exposure to distilled water. The article presents an extensive amount of experimental data as well as predictions based on a couple damage/viscoelastic constitutive formulation generated to model the specific behavior of the material at hand. Damage evolution relations are derived from an empirical relationship. Th… more
Date: October 1, 1999
Creator: Elahi, M. & Weitsman, Y.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A mechanics model for the deformation of swirl-mat composites

Description: Swirl-mat polymeric composites are considered as representative materials for application in the automotive industry. This article summarizes a three-year long effort to characterize, model, and predict the deformation of these composites under stress, temperature, cyclic loadings, and the ingress of fluids. The effort involved several hundred characterization tests of various kinds and the formulation of a constitutive model based upon fundamental principles of irreversible thermodynamics and … more
Date: November 1, 1998
Creator: Elahi, M. & Weitsman, Y.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Durability of polymer matrix composites for automotive structural applications: A state-of-the-art review

Description: A key unanswered question that must be addressed before polymeric composites will be widely used in automotive structural components is their known durability. Major durability issues are the effects that cyclic loadings, creep, automotive fluid environments, and low-energy impacts have on dimensional stability, strength, and stiffness throughout the required life of a composite component. This report reviews the current state of understanding in each of these areas. It also discusses the limit… more
Date: July 1, 1995
Creator: Corum, J.M.; Simpson, W.A. Jr.; Sun, C.T.; Talreja, R. & Weitsman, Y.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multifracture of ceramic composites

Description: This work presents a mechanistic model for the multifracture process of uniaxially reinforced fibrous ceramic composites under monotonically increasing tension parallel to the fiber direction. The model employs an energy criterion to account for the progression of matrix cracks, bridged by intact fibers, and Weibull failure statistics to relate the failure of the fibers. Consideration is given to the interactions between the foregoing failure processes as well as to the effects of various mater… more
Date: March 1, 1992
Creator: Weitsman, Y.J. (Oak Ridge National Lab., TN (United States)) & Zhu, H. (Tennessee Univ., Knoxville, TN (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Durability of composites in automotive structural applications

Description: The overall goal of the project is to develop experimentally-based, durability-driven design guidelines for automotive composite structures and to demonstrate their applicability to lightweight, manufacturable structures under representative field loading histories and environments. Key technical issues are the potentially degrading effects that (1) both cyclic and long-term sustained loadings, (2) various automotive environments, and (3) low-energy impacts can have on the dimensional stability… more
Date: October 1, 1996
Creator: Corum, J. M.; Battiste, R. L.; McCoy, H. E.; Ruggles, M. B.; Simpson, W. A. & Weitsman, Y. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Durability-Based Design Guide for an Automotive Structural Composite: Part 2. Background Data and Models

Description: This background report is a companion to the document entitled ''Durability-Based Design Criteria for an Automotive Structural Composite: Part 1. Design Rules'' (ORNL-6930). The rules and the supporting material characterization and modeling efforts described here are the result of a U.S. Department of Energy Advanced Automotive Materials project entitled ''Durability of Lightweight Composite Structures.'' The overall goal of the project is to develop experimentally based, durability-driven des… more
Date: February 1, 1998
Creator: Corum, J.M.; Battiste, R.L.; Brinkman, C.R.; Ren, W.; Ruggles, M.B.; Weitsman, Y.J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen