「き裂治癒＋保証試験」によるセラミックコイルばねの信頼性保証

概要

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Structural ceramics are brittle and sensitive to flaws. As a result, the structural integrity of a ceramic component may be seriously affected. A new technique to guarantee the reliability of ceramic components is demanded and so we proposed new technique [Crack-healing+Proof test]. For this technique, the mechanical behavior of the crack-healed zone is very important for the structural integrity. The equation has been derived based on process zone size failure criterion, which shows the temperature dependence of the proofed stress. The main results obtained are as follows: (1) By crack-healing, the strength of ceramic coil spring increased and failure ratio by proof test was decreased. (2) Temperature dependence of proofed stress by proof test at room temperature was analyzed quantitatively as a function of proof stress and temperature. (3) The calculated temperature dependence of proofed stress showed excellent agreement with experimental one.
一般社団法人日本高圧力技術協会の論文