COMPUTATIONAL MODEL OF SPALLING AND EFFECTIVE FIBERS ON TOUGHE-NING IN FIBER REINFORCED COMPOSITES AT AN EARLY STAGE OF CRACK FORMATION
Keywords:FIBER REINFORCED COMPOSITE, TOUGHENING, SPALLING, BRIDGING STRESS, FIBER/MATRIX INTERFACE, KELVIN FUNDAMENTAL SOLUTION.
AbstractTHIS WORK SUGGESTS A COMPUTATIONAL MODEL THAT TAKES ACCOUNT OF EFFECTIVE FIBERS ON TOUGHENING IN FRC AT AN EARLY STAGE OF CRACK FORMATION.&NBSP; 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&RSQUO;S FUNDAMENTAL SOLUTION AND THE MINDLIN&RSQUO;S COMPLEMENTARY SOLUTION.&NBSP; THE EVOLUTION OF SPALLING IN THE MATRIX WAS TRACED.&NBSP; THE PERCENTAGES OF EFFECTIVE FIBERS WERE EVALUATED WITH VARIATIONS IN STRENGTH, INTERFACE RESISTANCE,&NBSP; 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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