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Distributor's Link Magazine Spring 2019 / Vol 42 No2

146 THE DISTRIBUTOR’S

146 THE DISTRIBUTOR’S LINK SPIROL HOW TO CALCULATE THE ESTIMATED FATIGUE LIFE OF A DISC SPRING from page 80 FIGURE 2: EXCERPT FROM SPECIFICATION CHART IN SPIROL’S DISC SPRING CATALOG Example 1 Estimate the fatigue life of a DIN EN 16983 Series B Group 2, DSC 50 x 25.4 x 2 Disc Spring with a preload of 15% of its initial height with a final position at 75% of its initial height. Using the specification chart (shown in Figure 2), Stress II (II) at 15% is 128 N/mm² and Stress III (III) is 264 N/mm². Stress II (II) at 75% is 923 N/mm² and Stress III (III) is 1,140 N/mm². Now calculate the differences between the stress at each location. MAXIMUM DIFFERENTIAL STRESS, N/mm² FATIGUE LIFE CHART: GROUP 2 1.25mm ≤ t ≤ 6.0mm 923 N/mm² - 128 N/mm² = 795 N/mm² Stress II at 75% Stress II at 15% 1,140 N/mm² - 264 N/mm² = 876 N/mm² Stress III at 75% Stress III at 15% MINIMUM TENSILE STRESS, N/mm² FIGURE 3: ESTIMATED FATIGUE LIFE FOR DSC 50 X 25.4 X 2 DISC SPRING IN EXAMPLE 1 As seen in the calculation above, the maximum differential in stress occurs at location III, therefore we will use the stress values from location III and the fatigue life charts to estimate the fatigue life of the Disc Spring. The intersection of a vertical line drawn on the X-axis representing the minimum stress at location III and a horizontal line drawn on the Y-axis representing the maximum stress at location III is the estimated fatigue life. In this example and using Figure 3, the line on the X-axis is drawn at 264 N/mm², and the line drawn on the Y-axis is drawn at 1,140 N/mm². The intersection is slightly above the “100,000 cycle” line as represented by N = 105 in Figure 3. This represents an estimated fatigue life of slightly less than 100,000 cycles. CONTINUED ON PAGE 168

MWFA/PAC-WEST/NFDA JOINT CONFERENCE OMNI HOTEL, SAN DIEGO, CA - MARCH 13-16, 2019 more photos on page 165

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