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"NASA Technical Reports Server (NTRS) 19940012822: Prediction Of Thermal Cycling Induced Cracking In Polymer Matrix Composites" and the language of the book is English.


“NASA Technical Reports Server (NTRS) 19940012822: Prediction Of Thermal Cycling Induced Cracking In Polymer Matrix Composites” Metadata:

  • Title: ➤  NASA Technical Reports Server (NTRS) 19940012822: Prediction Of Thermal Cycling Induced Cracking In Polymer Matrix Composites
  • Author: ➤  
  • Language: English

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  • Internet Archive ID: NASA_NTRS_Archive_19940012822

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"NASA Technical Reports Server (NTRS) 19940012822: Prediction Of Thermal Cycling Induced Cracking In Polymer Matrix Composites" Description:

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This report summarizes the work done in the period February 1993 through July 1993 on the 'Prediction of Thermal Cycling Induced Cracking In Polymer Matrix Composites' program. An oral presentation of this work was given to Langley personnel in September of 1993. This document was prepared for archival purposes. Progress studies have been performed on the effects of spatial variations in material strength. Qualitative agreement was found with observed patterns of crack distribution. These results were presented to NASA Langley personnel in November 1992. The analytical methodology developed by Prof. McManus in the summer of 1992 (under an ASEE fellowship) has been generalized. A method for predicting matrix cracking due to decreasing temperatures and/or thermal cycling in all plies of an arbitrary laminate has been implemented as a computer code. The code also predicts changes in properties due to the cracking. Experimental progressive cracking studies on a variety of laminates were carried out at Langley Research Center. Results were correlated to predictions using the new methods. Results were initially mixed. This motivated an exploration of the configuration of cracks within laminates. A crack configuration study was carried out by cutting and/or sanding specimens in order to examine the distribution of cracks within the specimens. These investigations were supplemented by dye-penetrant enhanced X-ray photographs. The behavior of thin plies was found to be different from the behavior of thicker plies (or ply groups) on which existing theories are based. Significant edge effects were also noted, which caused the traditional metric of microcracking (count of cracks on a polished edge) to be very inaccurate in some cases. With edge and configuration taken into account, rough agreement with predictions was achieved. All results to date were reviewed with NASA Langley personnel in September 1993.

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