窒化ケイ素の高温における破壊エネルギーと引張り強度

概要

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The work-of-fracture (WOF) tests were conducted for hot-pressed silicon nitride at high temperatures above 1000℃ to investigate displacement rate (D-rate) dependence of effective fracture energy and then, the bridging stress at a crack interface was estimated from the increment of fracture resistance with crack extension (R-curve behavior) to discuss its correspondence to tensile strength. The effective fracture energy and the bridging stress increased with lowering D-rate, and then decreased probably due to the activated pulling out work of grains and its sensitivity to change in D-rate. The bridging stress was shown to correspond to a great part of tensile strength in the range where a plasticity was seen in the stress-displacement (S-D) curve, implying a large contribution of grain bridging toward bearing an applied tensile stress during slow crack extension.
社団法人日本セラミックス協会の論文
1990-03-01