アルミナ粒子分散エポキシ樹脂の破面形態

抄録

In order to study the relations between loading conditions and fractographic features of alumina-particulate-filled epoxide composite, the fracture surfaces of notched specimens subjected to impact bending and creep rupture under various temperature conditions were examined.
As the result of microscopic observation, the fracture surface was found to take four types of appearances ranging from the flat and featureless one to the dimple-like one depending upon the test temperature, the applied stress level and the velocity of crack propagation. To clarify the fracture surface formation mechanism, finite element analysis was performed on the interaction between crack tip stress field and thermal stress in the vicinity of an alumina particle, and the direction of crack propagation was evaluated based on the maximum tangential stress criterion and the strain energy density criterion.