High Temperature and Environmental Effects on Polymeric Composites
Title | High Temperature and Environmental Effects on Polymeric Composites PDF eBook |
Author | Thomas S. Gates |
Publisher | ASTM International |
Pages | 276 |
Release | 1997 |
Genre | Technology & Engineering |
ISBN | 9780803124240 |
High Temperature and Environmental Effects on Polymeric Composites
Title | High Temperature and Environmental Effects on Polymeric Composites PDF eBook |
Author | Charles E. Harris |
Publisher | ASTM International |
Pages | 223 |
Release | 1993 |
Genre | Polymeric composites |
ISBN | 0803114915 |
Aerospace and naval applications of polymers in conditions once thought too harsh for them, take center stage in the survey of how polymer composites react to environmental conditions. A dozen papers from a symposium in San Diego, October 1991, describe damage mechanisms and failure, materials behavior under combined effects, and constitutive models, sometimes considering polymers as a whole, but more often specific groups or composites. No index. Annotation copyright by Book News, Inc., Portland, OR.
High Temperature and Environmental Effects on Polymeric Composites
Title | High Temperature and Environmental Effects on Polymeric Composites PDF eBook |
Author | ASTM Committee D-30 on High Modulus Fibers and Their Composites |
Publisher | |
Pages | |
Release | 1993 |
Genre | |
ISBN | 9789803114817 |
High Temperature and Environmental Effects on Polymeric Composites
Title | High Temperature and Environmental Effects on Polymeric Composites PDF eBook |
Author | Thomas S. Gates |
Publisher | ASTM International |
Pages | 276 |
Release | 1997 |
Genre | Materials at high temperatures |
ISBN | 9780803124240 |
Going to Extremes
Title | Going to Extremes PDF eBook |
Author | National Research Council |
Publisher | National Academies Press |
Pages | 80 |
Release | 2005-10-22 |
Genre | Technology & Engineering |
ISBN | 0309097150 |
Advanced polymer matrix composites (PMC) have many advantages such as light weight and high specific strength that make them useful for many aerospace applications. Enormous uncertainty exists, however, in predicting long-term changes in properties of PMCs under extreme environmental conditions, which has limited their use. To help address this issue, the Department of Defense requested a study from the NRC to identify the barriers and limitations to the use of PMCs in extreme environments. The study was to focus on issues surrounding methodologies for predicting long-term performance. This report provides a review of the challenges facing application of PMCs in extreme environments, the current understanding of PMC properties and behavior, an analysis of the importance of data in developing effective models, and recommendations for improving long-term predictive methodologies.
Environmental Effects on Polymer-Matrix Composites
Title | Environmental Effects on Polymer-Matrix Composites PDF eBook |
Author | C. Lee |
Publisher | |
Pages | 56 |
Release | 1997 |
Genre | |
ISBN |
A variety of environmental factors can influence the performance of advanced polymers and composites. In particular, exposure to a combination of moisture and elevated temperature can significantly alter properties. The extent of chemical and physical changes is a function of exposure time and the temperature and humidity of the environment. This work discusses the effects of chemical and physical aging of AFR700B, a high-temperature addition polyimide resin. Neat resin samples were isothermally aged for 500 and 1000 hours at 250 deg C in dry air, humid air, and dry nitrogen. Changes in the dynamic mechanical properties and weight of the resin samples after these different exposures are discussed. An accelerated aging process was developed to facilitate the study of hydrolytic degradation. The effect of degradation on the Tg, weight, and mechanical behavior is discussed. The use of a silicon-nitride moisture barrier proved ineffective.
Coupled Materials and Mechanics Analyses of Durability Tests for High Temperature Polymer Matrix Composites
Title | Coupled Materials and Mechanics Analyses of Durability Tests for High Temperature Polymer Matrix Composites PDF eBook |
Author | Hugh L. N. McManus |
Publisher | |
Pages | 24 |
Release | 1995 |
Genre | |
ISBN |
A complete coupled model of the environmentally-induced degradation of composite materials, and the effect of this degradation on composite laminate behavior, is presented. Although the model is not sufficiently mature for predictive design use, it provides major insights into the mechanisms of degradation of composite materials. The model is used to study test methods frequently used to assess composite durability, including weight loss, shrinkage, and mechanical property degradation testing. It is found that even simple tests of material undergoing environmentally-induced degradation are difficult to interpret. In particular, the spatial non-uniformity of degradation converts originally simple specimens into complex structures with non-uniform chemical and mechanical states. Consideration of this complexity is vital to the full understanding of the results of such tests.