A plate made from a certain thermoplastic polymer is subjectedto biaxial tensile loading as shown in Figure Q4 (a). A designcondition for the plate is that the maximum normal strain does notexceed 2.5% after 106 seconds of continuous loading. Calculate asuitable plate thickness to satisfy this condition. (Note:Isochronous curves for the polymer are shown in Figure Q4 (b).Assume a Poisson’s ratio of ?= 0.45)
12 103 108 seconds 0 0.515 2 2.5 3 3.5 4 45 5
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