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Time-Dependent Stress Profiles

ALTA Single-Stress Example

ALTA Two-Stress Example

Stress Profile Example

A reliability engineer is asked to determine, with a confidence level of 90%, whether an electronic component has a B10 life of at least 350 hours under ordinary conditions.

To simplify the analysis, the engineer will assume that the ordinary stress conditions for the component consist of a constant stress level of 2 V. However, because the ordinary stress conditions are known to involve escalating stress values, the component will be subjected to a time-dependent voltage stress during testing. The following table describes the stress values that will be applied during the test.

Starting Time (Hr)

Ending Time (Hr)

Stress Level (V)

0

250

2

250

350

3

350

370

4

370

380

5

380

390

6

390

400

7

 

All eleven units were tested to failure using the same stress profile. The following failure times were observed in the test.

Failure Time (Hr)

Stress Level

280

Time-dependent

310

Time-dependent

330

Time-dependent

352

Time-dependent

360

Time-dependent

366

Time-dependent

371

Time-dependent

374

Time-dependent

378

Time-dependent

381

Time-dependent

385

Time-dependent

Create a Life-Stress Data Folio and Stress Profile

Analyze the Data Set

 

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