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<html lang="en"> <head> <link rel="stylesheet" type="text/css" href="style.css"> <meta charset="utf-8" /> </head> <body> <h1>Polymer Fatigue Plots</h1> <h2>Weibull</h2> <div id="weibull"></div> <p>The Weibull slope, W, is a measure of convergence: a high W value indicates lifetimes are approximately equal across many samples; low W values indicate a wide divergence across samples. <p>In our experiments, the 0 and the 0-90 orientations show increasing divergence in cycles to failure as the stress increases. Counterintuitively, the concentric, 90, and 45/-45 orientations diverge <em>more</em> at high stresses. This is likely due to the fact that only three or four measurements were taken for these orientations at low stresses (18 MPa) and the breakage just happened to occur at around the same number of cycles each time, making it appear that low stresses have higher convergence. However, as so few samples were run, we are not able to make any claims about the relationship between stress and divergence at this time.</p> <h2>Average</h2> <div id="average"></div> <p>The concentric orientation showed a longer fatigue life than all other orientations at each stress. The 45/-45 and 0-90 orientations also performed well. The 90 orientation, consitent with prior research in metallic samples, fared quite poorly.</p> <h2>Weibull, no 45s</h2> <div id="weibull-no-45s"></div> <h2>Average, no 45s</h2> <div id="average-no-45s"></div> <script src="sketch.js"></script> </body></html>