前言材料抗应力腐蚀断裂韧性的主要指标是门限应力强度因子 K_(ISCC)及裂纹扩展速率 da/dt。对 da/dt 的实验测定,直接方法是定期从介质中取出试样,对试样表面裂纹长度进行目测,或从介质外进行望远遥测。但这类方法局限性很大,主要是所测值均为表面裂纹值,而腐蚀介质中的表面裂纹往往不易辨别:同时表面裂纹值同内部裂纹值又常不一致:此外,若每次测定时,都要把试样从介质中取出放入,则操作极不方便,特别是对高压或有毒介质,经常取出放入几乎不可能。为了避免这些缺点,可采用另一类“柔度测定法”。国外已报道了多种类型的柔度测定技术.本文介绍自行设计和使用的一种柔度测试装置——测 Foreword The main indicators of stress corrosion cracking toughness are the threshold stress intensity factor K ISCC and crack growth rate da / dt. The experimental determination of da / dt, the direct method is to periodically remove the sample from the medium, the surface crack length of the sample visual observation, or from the media for telemetry. However, this method is very limited, mainly the measured values ​​are surface crack values, and the surface cracks in the corrosive medium is often not easy to distinguish: while the surface crack value and internal crack values ​​are often inconsistent: In addition, if each measurement , Have to remove the sample from the media into the operation is extremely inconvenient, especially for high-pressure or toxic medium, often removed into almost impossible. To avoid these drawbacks, another type of “compliance test” can be used. Foreign countries have reported a variety of types of flexibility measurement technology.This paper describes a self-designed and used a flexibility test device - measured