Mechanical properties due to competition behavior between damage and recovery of self‐healing fiber‐reinforced ceramics

Abstract

AbstractThe phenomenon caused by the competition between self‐healing and crack propagation of self‐healing fiber‐reinforced ceramics was succeeded to be quantified as a new mechanical function. To quantify, it was measured in detail that the creep deformation as time variation of the self‐healing composite under various stresses. In particular, a detailed analysis will be carried out focusing on the time variation of the creep rate. When the tensile stress of 100 MPa was applied to the self‐healing composite, the initially large creep rate decreased with time, eventually reaching zero. This behavior is considered to be achieved by self‐healing that suppresses crack propagation. The time when the creep rate reaches 0 is an important indicator of self‐healing ability and was defined as the crack arrest time. From the results of similar experiments in which the applied stress was varied, it was found that the crack arrest time increased with the applied stress. However, at 160 MPa, creep fracture occurred. From these results, it was confirmed that the maximum stress at which the competition behavior could be expressed was 153 MPa or less. Based on the obtained results, we propose a new mechanical function that utilizes the self‐healing function.