地震学报（英文版）2002，Vol.15Issue(6)：656-666,11.
A study on relation between acoustic emission and characteristic displacement field on the sample with multi en echelon structures - The theoretic and experimental explorations of strain gap
A study on relation between acoustic emission and characteristic displacement field on the sample with multi en echelon structures - The theoretic and experimental explorations of strain gap
摘要
Abstract
Based on the phenomena that the deformation gap was observed before the great Tangshang earthquake, this paper discusses the strain gap according to test and theory. The (strain) patterns were recorded photographically by real-time holographic interferometry and shadow optical method of caustics, as soon as the loading process started. In the meantime, the AE (acoustic emission) signals were recorded by a micro crack information storage-analysis system. According to damage theory and location of micro fracture, we have studied the stain gap and gained: a) It is necessary that strain gap appears under the condition of linear elasticity theory, and its situation is relatively stable, corresponding to stress concentration. b) Micro fractures, which appear initially at area of high stress, occur rarely at the strain gap, and their locations are finally in the zone between the stress concentration area and the strain gap, which indicate the clusters or groups. However, the major macro fracture (final rupture) started from the shadow areas, and then grew quickly towards the strain gaps, which resulted in failure of sample.关键词
strain gap/main fracture/micro fracture/damage theoryKey words
strain gap/main fracture/micro fracture/damage theory分类
天文与地球科学引用本文复制引用
陈顺云,许昭永,杨润海,赵晋明,郝锦琦,王赟赟,王正荣,熊秉衡..A study on relation between acoustic emission and characteristic displacement field on the sample with multi en echelon structures - The theoretic and experimental explorations of strain gap[J].地震学报（英文版）,2002,15(6):656-666,11.基金项目
The Dual Project of China Seismological Bureau (9691309020301), the Specialized Funds for National Key Basic Study (G1998040704), the project for the MOST under contract (2001BA601B02) and Youth Funds for applied basic study of the Science and Technology （9691309020301）
