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本文就J积分测试标准GB2038—80所推荐的钝化线公式进行了讨论,在对共所表达的意义予以理论征明的同时,并着重指出了在低温条件下它的不适用性(根据试验证明)。 研究在低温条件下如何标定钝化线过程中,我们认识到:应在不同低温下具体标定转动因子γ来计算COD,由此确定具体材料试验温度下的J—δ关系,并根据不同材料在钝化阶段的δ—△α关系,以确定饨化阶段的J—△α关系,即得相应低温下的钝化线方程。 由此得到的钝化线方程,具有J—α_0+β△α的形式,它和J_R阻力曲线交点所确定的J值,与利用多试件法结合声发射监测技术确定的裂纹尖端全面启裂时的J_(1c)值颇为接近。
This paper discusses the formula of passivation line recommended by J integral test standard GB2038-80. While expounding the theory of the common expression, it also points out its inapplicability under the condition of low temperature ). In the process of how to calibrate the passivation line under low temperature conditions, we recognize that COD should be calculated by specific calibration of the rotation factor γ at different low temperatures to determine the J-δ relationship at the specific temperature of the test material. Passivation stage of δ - △ α relationship to determine the relationship between the J - △ α phase, which was the corresponding low temperature passivation equation. The resulting passivation equation has the form J-α_0 + βΔα, which is determined by the intersection of the J_R resistance curve with the J value determined by the multi-specimen method combined with the acoustic emission monitoring technique When J_ (1c) value is quite close.