| 摘要 |
FIELD: physics. ^ SUBSTANCE: metal foil of certain thickness, length and width is used to produce certain defects with certain width opening, depth and length on reference specimens for testing. Prepared foil strips are fitted in pre-prepared grooves of rectangular or round shape to be filled with epoxy glue so that foil is immersed in glue to depth of 1-2 mm. With epoxy glue set, prepared specimen is ground to preset surface roughness and that of foil strip width. Then, foil is etched to produce defect. ^ EFFECT: certain defects with certain width opening, depth and length on reference specimens for testing. ^ 4 dwg |
