3D CHARACTERIZATION OF MIXED-MODE FRACTURE TOUGHNESS OF MATERIALS USING A NEW LOADING DEVICE
Keywords:FRACTURE TOUGHNESS TESTING, MIXED-MODE I/II FRACTURE, EXPERIMENTAL ANALYSIS, MODIFIED LOADING DEVICE, FINITE-ELEMENT ANALYSIS
AbstractIN THIS PAPER, A NEW LOADING DEVICE WAS EMPLOYED TO CONDUCT A MIXED-MODE FRACTURE TEST. THEREFORE, DISADVANTAGES DETECTED IN THE PREVIOUS MIXED-MODE FRACTURE TOUGHNESS TEST METHODS CAN BE AVOIDED. THE NEW FIXTURE HAS PERFECT SYMMETRY WHICH PROVIDES A UNIFORM STRESS STATE, CREATES THE PURE PLANE STRAIN CONDITIONS AND ELIMINATES THE UNWANTED MODE-III LOADING CONDITIONS. THE VALUES OF NON-DIMENSIONAL STRESS INTENSITY FACTORS FOR PURE MODE-I, PURE MODE-II, AND PURE MODE-III WERE OBTAINED USING 3D MODELS OF NEW LOADING DEVICE AND MODIFIED ARCAN METHOD IN ORDER TO COMPARE THE RESULTS AND INVESTIGATE THE VARIATION OF FRACTURE PARAMETERS. FURTHERMORE, THE VALUES OF CORRECTION FACTORS FOR PURE MODE-III IN VARIOUS LOADING ANGLES WERE STUDIED FOR BOTH FIXTURES AND IT WAS RESULTED THAT IN MODIFIED ARCAN DEVICE THERE WAS A LARGER CONTRI-BUTION OF UNWANTED THIRD MODE LOADING CONDITIONS AND THEREFORE THE VALUES OF MODE-I AND MODE-II NON-DIMENSIONAL STRESS INTENSITY FACTORS WERE AFFECTED. IN THE PRESENT STUDY, IN ORDER TO COMPARE THE RESULTS, THE FRACTURE TOUGHNESS VALUES OF ABS (ACRYLONITRILE BUTADIENE STYRENE) POLYMERIC MATERIAL WERE DETERMINED EXPERI-MENTALLY FOR BOTH FIXTURES AND A FULL RANGE OF MIXED-MODE LOADING CONDITIONS INCLUDING PURE MODE-I AND PURE MODE-II LOADING WERE CREATED AND TESTED. THE DIFFERENCES IN CRITICAL STRESS INTENSITY FACTORS OF THE FIXTURES WERE FOUND ABOUT 7.00% AND 42.65% IN MODE-I AND MODE-II LOADING CONDITIONS, RESPECTIVELY.
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