Actual bearing stress of matrix in the Al18B4O33 fiber/6061Al composite under uniaxial tensile loading

Use of the X-ray diffraction technique to measure the bearing stress of the matrix in the composite was established. The experimental results show tha t the bearing stress ratio of the matrix is 0.715 and 0.537 of the total ap plied stress for the 25 vol.% Al18B4O33 fiber/6061Al as-cast and as-extrude d composite, respectively. Due to the aligned fibers, the as-extruded compo site gives rise to greater mechanical strengthening. although the aspect ra tio of the fiber in the as-extruded composite is lower than that in the as- cast material. According to the shear-lag model, the bearing stress ratio o f the matrix in the composite was analyzed. It was verified that. the theor etical bearing stress ratio of the matrix in the composite is agreement wit h the result from experiment. (C) 2001 Elsevier Science B.V. All rights res erved.