(2) radial contraction of amount
| 1 − σ² | 3⁄8 ω²ρr², |
| E |
(3) contraction along the circular filaments of amount
| 1 − σ² | 1⁄8 ω²ρr², |
| E |
(4) extension of all filaments at right angles to the axis of amount
| 1 | 1⁄6 ω²ρ (l² − 3z²) σ (1 + σ), |
| E |
(5) contraction of the filaments normal to the plane of the disk of amount
| 2σ | 1⁄8 ω²ρa² (3 + σ) − | σ | 1⁄2 ω²ρr² (1 + σ) + | 2σ | 1⁄6 ω²ρ (l² − 3z²) σ | (1 + σ) | . |
| E | E | E | (1 − σ) |
The greatest extension is the circumferential extension near the centre, and its amount is
| (3 + σ) (1 − σ) | ω²ρa² + | σ (1 + σ) | ω²ρl². |
| 8E | 6E |