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Supplement to fatigue tests of glass-fabric-base laminates subjected to axial loading Public Deposited

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Information reviewed and reaffirmed May 1960


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  • This report has been prepared as a supplement to Forest Products Laboratory Report No. 1823, "Fatigue Tests of Glass-Fabric-Base Laminates Subjected to Axial Loading." It presents a correlation of the fatigue data in the basic report with stress-rupture data on the same material reported in Forest Products Laboratory Report No. 1839, "Stress-Rupture Tests of a Glass-Fabric-Base Plastic Laminate." The basic report presents the fatigue properties of three types of glass-­fabric-base plastic laminates at room temperature. S-N curves between 1 thousand and 10 million cycles show the fatigue strength and the effect of various factors on the fatigue strength. One of these factors was the effect of three mean stresses on the duration of various alternat­ing stresses. This effect was determined for only one of the three lami­nates at mean stresses of zero, one-half, and one-fifth of the static-ulti­mate tensile stress. The data are presented in table 10 and figures 30 and 31 of Report No. 1823. It should be noted that these curves (the solid lines) were established from test values of alternating stress amplitude at the indicated number of cycles and at the three mean stress levels. However, no data were available to form a basis of projection of these curves (broken line) from the last point at 50 percent mean stress to the base line, which is the zero alternating stress, normally called steady stress. Since stress-rupture data were lacking, the curves were projected to the ultimate tensile stress. Report No. 1839 shows the relation of various levels of steady stress with time. The data in this report show that the maximum tensile stress that can be sustained for a period of time is less than the static tensile strength. With this relationship now available, the fatigue data may be correlated with the values of steady stress vs. time. The correlation may be accomplished by using values of steady stress, which can be sustained for periods corresponding to the duration of the appropriate number of cycles, as the terminus of the curves on figures 30 and 31 of Report No. 1823 .
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