Select an everyday item (coffee maker, lawnmower, bicycle, mobile phone, CD play

Question

Select an everyday item (coffee maker, lawnmower, bicycle, mobile phone, CD player, computer, refrigerator, microwave oven, cooking stove, etc.).

a) Discuss the ways this item can potentially fail. What can be done to prevent those failures?

b) Based on the Figures 1.3 and 1.4, what would be an example of the load and strength for a critical component within this item? Do you expect load and strength for this component to be time-dependent?

Explanation / Answer

Let us consider mobile phone as the everyday item.

a) The ways in which the item, in this case the mobile phone can potentially fail:

To prevent these failures the following measures can be undertaken:

b) In the digrams given above the values of strength and load for a critical component within this item, there will be some uncertainty about both. The actual strength values of any array of components will vary: there will be some that are relatively strong, others that are relatively weak, but most will be of nearly average strength. Also, the loads applied will be variable. First graph shows this type of situation so we can not accurately judge the strength or the loads for this critical component.

Failure will not occur so long as the applied load does not exceed the strength. However, if there is an overlap between the distributions of load and strength, and a load value in the high tail of the load distribution is applied to an item in the weak tail of the strength distribution so that there is overlap or interference between the distributions (second graph), then failure will occur.

Yes we expect the load and strength for this component to be time-dependent as usage of mobile phones work under time dependent mechanisms.

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