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Title: Inherent Defect Size: Calculation and Use For composite Materials

Source: In: Proceedings of 16th US National congress of theoretical and applied mechanics. 2010 June 27-July 2. State College, PA. State College, PA: The Pennsylvania State University; Paper Number 990; 2010

Author(s)Considine, John M.; Vahey, David W.; Rowlands, Robert E.; Turner, Kevin T.

Publication Year: 2010  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4709-5A

Abstract: The multi-step production of composite materials tends to increase the number of manufacturing defects. Composite materials considered here contained a variety of structural defects. Stresses induced by structural defects interact with each other during component loading in that the stresses are altered, either beneficially or detrimentally. The present method proposes a modification to the traditional ASC (Average Stress Criterion, [1]) such that an inherent defect size can be estimated. An inherent defect is defined as the strength-controlling material feature, which need not be physically present but rather represents the structural disorder of the material. This modified ASC (MASC) was applied to several composite materials including paper, oriented strandboard (OSB), graphite- and glass-epoxy composites, and a non-composite material, a polysilicon film; estimated inherent defect sizes scaled with material characteristics. Sizes ranged from 0.29 μm for a polysilicon film to 1.94 mm for OSB composite. The polysilicon film was included to evaluate the sensitivity of the defect calculation.

Keywords: Composite materials, mechanical properties, testing, strains, stresses, defects, particle board, paper, thin films, failure, strength, oriented strandboard, OSB, tensile strength, compressive strength

Publication Review Process: Non-Refereed (Other)

File size: 68 kb(s)

Date posted: 05/16/2011
RITS Product ID: 36623
Current FPL Scientist associated with this product
Considine, John M.
Materials Research Engineer

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