抄録
Stress distribution at the periphery of a circular and two pieces of rectangular shaped inclusions with prescribed various values of Young's modulus, were simulated and discussed by using the finite element method under the assumption that those inclusions were in the aluminum alloy matrix loaded with various stresses below the yielding stress of the aluminum alloy prescribed. Obtained conclusions were as follows: (1) In the case of a circular inclusion with lower Young's modulus, stress concentration were observed in the upper and lower ends of the inclusion, suggesting the occurrence of cracks on these ends and propagation of the cracks in a vertical direction versus tensile direction. (2) In the case of a circular inclusion with higher Young's modulus, stress concentration was obtained at the front and rear ends of the inclusion in the tensile direction, suggesting separation of the matrix and the inclusion particle and further generation and propagation of a void. (3) In the case of two pieces of rectangular inclusions having the same shape and size, the stress concentration and distributions were substantially affected by the relative positional relationships of the respective two inclusions positioned in the tensile direction. (4) In the case of changing the size of the inclusions, remarkable stress concentration were observed with larger size inclusion of lower Young's modulus and generous stress concentration for higher Young's modulus.
