COMPUTATIONAL MODEL OF SPALLING AND EFFECTIVE FIBERS ON TOUGHE-NING IN FIBER REINFORCED COMPOSITES AT AN EARLY STAGE OF CRACK FORMATION

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CHONG WANG
LEANDRO FERREIRA FRIEDRICH

Abstract

THIS WORK SUGGESTS A COMPUTATIONAL MODEL THAT TAKES ACCOUNT OF EFFECTIVE FIBERS ON TOUGHENING IN FRC AT AN EARLY STAGE OF CRACK FORMATION.  WE DERIVED THE DISTRIBUTION OF PRESSURE PROVOKED BY A RANDOM INCLINED FIBER IN THE MATRIX AND CALCULATED STRESSES THROUGH INTEGRATING THE PRESSURE AND TANGENT STRESS ALONG THE FIBER/MATRIX INTERFACE WITH THE KELVIN’S FUNDAMENTAL SOLUTION AND THE MINDLIN’S COMPLEMENTARY SOLUTION.  THE EVOLUTION OF SPALLING IN THE MATRIX WAS TRACED.  THE PERCENTAGES OF EFFECTIVE FIBERS WERE EVALUATED WITH VARIATIONS IN STRENGTH, INTERFACE RESISTANCE,  DIAMETER AND ELASTICITY MODULUS. THE MAIN CONCLUSION IS THAT LOW ELASTICITY MODULUS COMBINED HIGH STRENGTH OF FIBERS RAISES DRAMATICALLY THE EFFECTIVE FIBERS, WHICH WOULD BENEFIT TOUGHENING.

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Author Biographies

CHONG WANG, UNIVERSIDADE FEDERAL DO PAMPA

WANG CHONG IS ADJUNCT PROFESSOR OF MECHANICAL ENGINEERING DIVISION OF FEDERAL UNIVERSITY OF PAMPA IN BRAZIL.  HE GRADUATED FROM THE UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA IN 1982, RECEIVED AN MSC FROM THE CHINESE ACADEMY OF SCIENCES IN 1985 AND EARNED HIS DOCTORATE FROM CHINA UNIVERSITY OF MINING AND TECHNOLOGY IN 1988.  AS A VISITING SCIENTIST, HE WORKED IN THE FEDERAL UNIVERSITY OF SAO CARLOS AND THE UNIVERSITY OF SAO PAULO IN BRAZIL.  HIS ACADEMIC INTERESTS HAVE BEEN FOCUSED ON SOLID MECHANICS. THE CURRENT RESEARCH THEMES ARE RELATED TO TOUGHENING CERAMICS BY MICRO FIBERS AND MECHANICAL PERFORMANCE OF PAVEMENTS INFLUENCED BY TEMPERATURE.

LEANDRO FERREIRA FRIEDRICH, UNIVERSIDADE FEDERAL DO PAMPA

LEANDRO FERREIRA FRIEDRICH IS A GRADUATE STUDENT OF MECHANICAL ENGINEERING DIVISION OF FEDERAL UNIVERSITY OF PAMPA IN BRAZIL.  HE FEATURES IN NUMERICAL COMPUTATION.