Glass Breakage Analysis II PPG（玻璃破损分析2分）.pdfVIP

Glass Technical Document TD-111 Glass Breakage Analysis II techniques. Once the break origin is located, In “Glass Breakage Analysis I (TD-110), if the breaking stress is higher than 1500 psi determining the location of the origin of (10.4 M Pa), a mirror radius fracture face the break was discussed using concave may be evident. break wave markings and tracing point-to- tail of arrows back to the origin. In this Analyzing the mirror radius of the break TD, we discuss thermal stress breakage origin can provide an estimate of the stress characteristics, and the relationship of level at breakage in addition to possible mirror radius to breaking stress. causes of the breakage. Examination of the FIGURE 1 illustrates the fracture face break origin can reveal scratches, digs, crush, wave markings produced by temperature chips, or weak edges due to poor cutting difference, e.g., thermal stress breakage, demonstrated by deep shark teeth or characterized by the parabolic shape of the serration hackle at the edge, which caused break waves. The break moved from left to the breakage. right into the concave face of the waves. A powerful point source of light along with Lower st