coefficient of restitution, e, describes the rebound velocity as a function of the impact velocity 13.1 total velocity changeR evr 13.2 △v=vr+vR (1+e)1=(1+e)2gh 13.3 Becauseo 1(typical values falling in the 0.3 to 0.5 range) 2gh≤A≤2√gh 13,4 velocity change is also numerically equal to the area beneath the shock pulse as shown in Figure 13.3
coefficient of restitution, e, describes the rebound velocity as a function of the impact velocity 13.1 total velocity change: 13.2 13.3 Because 0 1(typical values falling in the 0.3 to 0.5 range): 13.4 velocity change is also numerically equal to the area beneath the shock pulse as shown in Figure 13.3. vR = evI I R v = v + v v = (1+ e)vI = (1+ e) 2gh 2gh v 2 2gh
Area Veloci ty Change 山uOxu DURATIO MILLISECONDS Figure 13. 3 The relationship among shock parameters
Figure 13.3 The relationship among shock parameters
Package damage is related to the three factors involved in mechanical shock: Peak Acceleration ■ Duration a Velocity Change Mechanical Shock Theory Shown in Figure 13. 4, the product-package system consists of four basic components: the outer container, the cushion, the product, and a critical element a shown in Figure 13. 5: the product-package model:
Package damage is related to the three factors involved in mechanical shock: ◼ Peak Acceleration ◼ Duration ◼ Velocity Change Mechanical Shock Theory ◼ Shown in Figure 13.4, the product-package system consists of four basic components: the outer container, the cushion, the product, and a critical element. ◼ shown in Figure 13.5: the product-package model: