PAPER • OPEN ACCESS - Research on stratified evolution of composite materials under four-point bending loading
In order to explore the effect of stratified evolution and delamination on
the load capacity and service life of the composite materials under the four-point
bending loading, the artificial tectonic defects of the different positions were set up.
The four-point bending test was carried out, and the whole process was recorded by
acoustic emission, and the damage degree of the composite layer was judged by the
impact accumulation of the specimen - time-amplitude history chart,
load-time-relative energy history chart, acoustic emission impact signal positioning
map. The results show that the stratified defects near the surface of the specimen
accelerate the process of material failure and expansion. The location of the
delamination defects changes the bending performance of the composites to a great
extent. The closer the stratification defects are to the surface of the specimen, the
greater the damage, the worse the service capacity of the specimen.
In order to explore the effect of stratified evolution and delamination on
the load capacity and service life of the composite materials under the four-point
bending loading, the artificial tectonic defects of the different positions were set up.
The four-point bending test was carried out, and the whole process was recorded by
acoustic emission, and the damage degree of the composite layer was judged by the
impact accumulation of the specimen - time-amplitude history chart,
load-time-relative energy history chart, acoustic emission impact signal positioning
map. The results show that the stratified defects near the surface of the specimen
accelerate the process of material failure and expansion. The location of the
delamination defects changes the bending performance of the composites to a great
extent. The closer the stratification defects are to the surface of the specimen, the
greater the damage, the worse the service capacity of the specimen.
