Fatigue & Durability Testing

The following application note describes the test and measurement process for the fatigue & durability testing and development cycle of an automotive suspension component, specifically a tie rod. The component had been known to fail at various intervals. An estimate of the predicted fatigue life of the component was required in order to assess the feasibility of its continued use and to see if a design change was required. The component under test is shown in Figure 1. The testing was carried out by a major automotive manufacturer. Strain gauges were used to monitor the strain levels.

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Non-Linear Calibration Curve And Polynomial

Not all systems vary linearly. One very well-known case is, of course, thermocouples. International standard curves are available for these, so they present little difficulty. The issue discussed here is determining a non-linear calibration curve and, if appropriate, reducing it to a polynomial.

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