<正> 应力腐蚀开裂是一种比较复杂的现象,不仅与裂纹尖端的力学状态有关,而且与裂纹尖端附近的腐蚀介质条件及受应力腐蚀的材料的性质和状态有关。按照断裂力学的观点,即使对于厚度满足平面应变条件的试样,在受载后,试样表面层也并不处于平面应变状态,而是处于平面应力状态.对于这种试样进行应力腐蚀试验,单从力学因素来说,裂纹应优先在试样厚度中心部位(处于三轴应力状态)处扩展,在试样表面层,由
Stress corrosion tests were conducted with a cantilever bend test machine. An aqueous solution of 3.5% NaCl was used as a corrodent. It was observed that the shape of the crack front is closely related to the surface deformation on the specimen surface perpendicular to the stress corrosion crack. This experiment shows that for ultra-high strength steels the change of the size of the deformation zone observed on the specimen surface can be hardly explained by the change of the size of the plastic zone at the tip of crack. Such an observation may be correlated with the stress state of the surface layer.
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%