论文部分内容阅读
对仅具有线定位功能的4010声发射仪进行了改装,使之能进行面定位并能实时输出。增加同步时间控制器,使两组线定位器能保证对同一事件进行两个轴向同时定位;改单探头为多探头并联,并且在探头和样品间加声导板,减小定位误差,使非线性定位造成的误差与仪器的分辨精度一致,综合误差为样品尺度的1.5％;用Z-80单板机程控声发射仪和宽行打印机,将两个轴向的定位坐标和样品声发射率(或事件累集数,或能量值)实时打印。用改装后的4010声发射定位仪,在单轴压缩下对板状样品(300×150×13mm)进行直至破裂的定位实验,结果表明仪器的定位功能理想。同时,AE空间分布表明:于样品破坏前在“崩裂型”破裂区周围形成明显空区;AE密集区均被宏观张性或压性破裂贯穿;空间分布图象具有明显的阶段性。
The 4010 Acoustic Emission Transmitter, which has a line-only feature, has been retrofitted to allow surface positioning and real-time output. Increase the synchronization time controller, so that the two sets of line locator can ensure the same event of two simultaneous axial positioning; change single probe in parallel with multiple probes, and in the probe and sample plus voice guide plate to reduce the positioning error, so that non The error caused by linear positioning is consistent with the resolution accuracy of the instrument, and the integrated error is 1.5% of the sample size. Using the Z-80 single-board programmable acoustic transmitter and wide-line printer, the two axial positioning coordinates and the sample acoustic emissivity (Or event accumulation, or energy value) real-time printing. With the modified 4010 acoustic emission locator, the plate-shaped sample (300 × 150 × 13mm) under uniaxial compression was subjected to the positioning test until rupture. The results show that the positioning function of the instrument is ideal. At the same time, the spatial distribution of AE shows that there are obvious empty areas around the “cracking type” rupture zone before the sample is destroyed; the AE intensive areas are all penetrated by macroscopic or compressive fracture; the spatial distribution images have obvious stage.