annuluses

annuluses

1. ANALYSIS OF THE FACTORS EFFECTING CIRCUMFERENTIAL DEFECT DETECTION IN MAGNETIC PARTICLE INSPECTION OF ANNULUSES BY INDUCED CURRENT METHOD

感应法检测环形件周向缺陷时影响缺陷显示的因素分析

2. The disk, which is composed of continuous annuluses, can expand equivalent trangle by asymptotice line.We can obtain the circular area which is visually expressed by circumference and radius.

摘要把紧密相连的圆环构成的圆盘以渐开线展开成等面积的直角三角形，得出了较为直观的由周长和半径表示的圆面积公式。